Apache Camel Component Reference


Red Hat JBoss Fuse

Configuration reference for Camel components

Red Hat

Version 6.2
17 Jan 2018

Abstract

Apache Camel has over 100 components and each component is highly configurable. This guide describes the settings for each of the components.

Chapter 1. Components Overview

Abstract

This chapter provides a summary of all the components available for Apache Camel.

1.1. List of Components

Table of components

The following components are available for use with Apache Camel.
Expand
Table 1.1. Apache Camel Components
ComponentEndpoint URIArtifact IDDescription
ActiveMQ activemq:[queue:|topic:]DestinationName activemq-core For JMS Messaging with Apache ActiveMQ.
AHC ahc:http[s]://Hostname[:Port][/ResourceUri] camel-ahc Calls external HTTP servers using the Async Http Client library.
AHC-WSahc-ws[s]://Hostname[:Port][/ResourceUri]camel-ahc-wsCalls external WebSocket servers using the Async Http Client library.
AMQP amqp:[queue:|topic:]DestinationName[?Options]] camel-amqp For messaging with the AMQP protocol.
APNS apns:notify[?Options] apns:consumer[?Options] camel-apns For sending notifications to Apple iOS devices.
Atmosphere-WebSocketatmosphere-websocket:///RelativePath[?Options]camel-atmosphere-websocketAccepts connections from external WebSocket clients using Atmosphere.
Atom atom://AtomUri[?Options] camel-atom Working with Apache Abdera for atom integration, such as consuming an atom feed.
Avro avro:http://Hostname[:Port][?Options] camel-avro Working with Apache Avro for data serialization.
AWS-CWaws-cw://Namespace[?Options]camel-awsFor sending metrics to Amazon CloudWatch.
AWS-DDB aws-ddb://TableName[?Options] camel-aws For working with Amazon's DynamoDB (DDB).
AWS-SDB aws-sdb://DomainName[?Options] camel-aws For working with Amazon's SimpleDB (SDB).
AWS-SES aws-ses://From[?Options] camel-aws For working with Amazon's Simple Email Service (SES).
AWS-S3 aws-s3://BucketName[?Options] camel-aws For working with Amazon's Simple Storage Service (S3).
AWS-SNS aws-sns://TopicName[?Options] camel-aws For Messaging with Amazon's Simple Notification Service (SNS).
AWS-SQS aws-sqs://QueueName[?Options] camel-aws For Messaging with Amazon's Simple Queue Service (SQS).
Bean bean:BeanID[?methodName=Method] camel-core Uses the Bean Binding to bind message exchanges to beans in the Registry. Is also used for exposing and invoking POJO (Plain Old Java Objects).
Bean Validation bean-validator:Something[?Options] camel-bean-validator Validates the payload of a message using the Java Validation API (JSR 303 and JAXP Validation) and its reference implementation Hibernate Validator.
Browse browse: Name camel-core Provdes a simple BrowsableEndpoint which can be useful for testing, visualisation tools or debugging. The exchanges sent to the endpoint are all available to be browsed.
Cache cache://CacheName[?Options] camel-cache The cache component enables you to perform caching operations using EHCache as the Cache Implementation.
Class class:ClassName[?method=MethodName] camel-core Uses the Bean binding to bind message exchanges to beans in the registry. Is also used for exposing and invoking POJOs (Plain Old Java Objects).
CMIS cmis:CmisServerUrl[?Options] camel-cmis Uses the Apache Chemistry client API to interface with CMIS supporting CMS.
Cometd cometd://Hostname[:Port]/ChannelName[?Options] camel-cometd A transport for working with the jetty implementation of the cometd/bayeux protocol.
Context context:CamelContextId:LocalEndpointName camel-context Refers to an endpoint in a different CamelContext.
ControlBus controlbus:Command[?Options] camel-core ControlBus Enterprise Integration Pattern that allows you to send messages to endpoints for managing and monitoring your Camel applications.
CouchDB couchdb:http://Hostname[:Port] /Database[?Options]://Name[?Options] camel-couchdb Allows you to treat CouchDB instances as a producer or consumer of messages.
Crypto crypto:sign:Name[?Options] crypto:verify:Name[?Options] camel-crypto Sign and verify exchanges using the Signature Service of the Java Cryptographic Extension.
CXF cxf://Address[?Options] camel-cxf Working with Apache CXF for web services integration.
CXF Bean cxf:BeanName camel-cxf Proceess the exchange using a JAX WS or JAX RS annotated bean from the registry.
CXFRS cxfrs:bean:RsEndpoint[?Options] camel-cxf Provides integration with Apache CXF for connecting to JAX-RS services hosted in CXF.
DataFormatdataformat:Name:(marshal|unmarshal)[?Options]camel-coreEnables you to marshal or unmarshal a message in one of the standard Camel data formats, by sending it to an endpoint.
DataSet dataset:Name[?Options] camel-core For load & soak testing the DataSet provides a way to create huge numbers of messages for sending to Components or asserting that they are consumed correctly.
Direct direct:EndpointID[?Options] camel-core Synchronous call (single-threaded) to another endpoint from same CamelContext.
Direct-VM direct-vm:EndpointID[?Options] camel-core Synchronous call (single-threaded) to another endpoint in another CamelContext running in the same JVM.
Disruptor disruptor:Name[?Options] disruptor-vm:Name[?Options] camel-disruptorSimilar to a SEDA endpoint, but uses a Disruptor instead of a blocking queue.
DNS dns:Operation camel-dns Look up domain information and run DNS queries using DNSJava
Dropboxdropbox://[Operation][?Options]camel-dropboxSends or receives messages from Dropbox remote folders.
ElasticSearch elasticsearch:ClusterName camel-elasticsearch For interfacing with an ElasticSearch server.
EventAdmin eventadmin:topic camel-eventadmin  
Exec exec://Executable[?Options] camel-exec Execute system command.
Fabric fabric:ClusterID[:PublishedURI][?Options] fabric-camel Look up or publish a fabric endpoint.
Facebookfacebook://[Endpoint][?Options] camel-facebookProvides access to all of the Facebook APIs accessible using Facebook4J.
File2 file://DirectoryName[?Options] camel-core Sending messages to a file or polling a file or directory.
Flatpack flatpack:[fixed|delim]: ConfigFile camel-flatpack Processing fixed width or delimited files or messages using the FlatPack library
FOP fop:OutputFormat camel-fop Renders the message into different output formats using Apache FOP.
Freemarker freemarker: TemplateResource camel-freemarker Generates a response using a Freemarker template.
FTP2 ftp://[Username@]Hostname[:Port]/Directoryname[?Options] camel-ftp Sending and receiving files over FTP.
GAuth gauth://Name[?Options] camel-gae Used by web applications to implement a Google-specific OAuth consumer
GHTTP ghttp:///Path[?Options] ghttp://Hostname[:Port]/Path[?Options] ghttps://Hostname[:Port]/Path[?Options] camel-gae Provides connectivity to the GAE URL fetch service and can also be used to receive messages from servlets.
GLogin glogin://Hostname[:Port][?Options] camel-gae Used by Camel applications outside Google App Engine (GAE) for programmatic login to GAE applications.
GMail gmail://Username@gmail.com[?Options] gmail://Username@googlemail.com[?Options] camel-gae Supports sending of emails via the GAE mail service.
GTask gtask://QueueName camel-gae Supports asynchronous message processing on GAE using the task queueing service as a message queue.
Geocoder geocoder:Address:Name[?Options] geocoder:latlng:Latitude,Longitude[?Options] camel-geocoderLooks up geocodes (latitude and longitude) for a given address, or performs reverse look-up.
GoogleDrivegoogle-drive://EndpointPrefix/Endpoint[?Options]camel-google-driveProvides access to the Google Drive file storage service.
Guava EventBus guava-eventbus:BusName[?EventClass=ClassName] camel-guava-eventbus The Google Guava EventBus allows publish-subscribe-style communication between components without requiring the components to explicitly register with one another (and thus be aware of each other). This component provides integration bridge between Camel and Google Guava EventBus infrastructure.
Hazelcast hazelcast://StoreType:CacheName[?Options] camel-hazelcast Hazelcast is a data grid entirely implemented in Java (single JAR). This component supports map, multimap, seda, queue, set, atomic number and simple cluster.
HBase hbase://Table[?Options] camel-hbase For reading/writing from/to an HBase store (Hadoop database).
HDFS hdfs://Hostname[:Port][/Path][?Options] camel-hdfs Reads from and writes to a Hadoop Distributed File System (HDFS) using Hadoop 1.x.
HDFS2hdfs2://Hostname[:Port][/Path][?Options]camel-hdfs2Reads from and writes to a Hadoop Distributed File System (HDFS) using Hadoop 2.x.
HL7 mina:tcp://Host[:Port] camel-hl7 For working with the HL7 MLLP protocol and the HL7 model using the HAPI library.
HTTP http://Hostname[:Port][/ResourceUri] camel-http For calling out to external HTTP servers, using Apache HTTP Client 3.x.
HTTP4 http://Hostname[:Port][/ResourceUri] camel-http4 For calling out to external HTTP servers, using Apache HTTP Client 4.x.
iBATIS ibatis:OperationName[?Options] camel-ibatis Performs a query, poll, insert, update or delete in a relational database using Apache iBATIS.
IMap imap://[UserName@]Host[:Port][?Options] camel-mail Receiving email using IMap.
IRC irc:Host[:Port]/#Room camel-irc For IRC communication.
JavaSpace javaspace:jini://Host[?Options] camel-javaspace Sending and receiving messages through JavaSpace.
JClouds jclouds:[Blobstore|ComputService]:Provider camel-jclouds For interacting with cloud compute & blobstore service via JClouds.
JCR jcr://UserName:Password@Repository/path/to/node camel-jcr Storing a message in a JCR (JSR-170) compliant repository like Apache Jackrabbit.
JDBC jdbc:DataSourceName[?Options] camel-jdbc For performing JDBC queries and operations.
Jetty jetty:http://Host[:Port][/ResourceUri] camel-jetty For exposing services over HTTP.
JGroupsjgroups:ClusterName[?Options]camel-jgroupsExchanges messages with JGroups clusters.
Jing
rng:LocalOrRemoteResource
rnc:LocalOrRemoteResource
Copy to Clipboard Toggle word wrap
camel-jing Validates the payload of a message using RelaxNG or RelaxNG compact syntax.
JMS jms:[temp:][queue:|topic:]DestinationName[?Options] camel-jms Working with JMS providers.
JMX jmx://Platform[?Options] camel-jmx For working with JMX notification listeners.
JPA jpa:[EntityClassName][?Options] camel-jpa For using a database as a queue via the JPA specification for working with OpenJPA, Hibernate or TopLink.
Jsch scp://Hostname/Destination camel-jsch Support for the scp protocol.
JT400 jt400://User:Pwd@System/PathToDTAQ camel-jt400 For integrating with data queues on an AS/400 (aka System i, IBM i, i5, ...) system.
Kafkakafka://Hostname[:Port][?Options]camel-kafkaSends or receives messages from an Apache Kafka message broker.
Kestrel kestrel://[AddressList/]Queuename[?Options] camel-kestrel For producing to or consuming from Kestrel queues.
Krati krati://[PathToDatastore/][?Options] camel-krati For producing to or consuming to Krati datastores.
Language language://LanguageName[:Script][?Options] camel-core Executes language scripts.
LDAP ldap:Host[:Port]?base=...[&scope=Scope] camel-ldap Performing searches on LDAP servers (Scope must be one of object|onelevel|subtree).
LevelDBN/A camel-leveldbA very lightweight and embeddable key-value database.
List list:ListID camel-core Provides a simple BrowsableEndpoint which can be useful for testing, visualisation tools or debugging. The exchanges sent to the endpoint are all available to be browsed.
Log log:LoggingCategory[?level=LoggingLevel] camel-core Uses Jakarta Commons Logging to log the message exchange to some underlying logging system like log4j.
Lucene lucene:SearcherName:insert[?analyzer=Analyzer] lucene:SearcherName:query[?analyzer=Analyzer] camel-lucene Uses Apache Lucene to perform Java-based indexing and full text based searches using advanced analysis/tokenization capabilities.
Master REVISIT   
Metricsmetrics:[meter|counter|histogram|timer]:Metricname[?Options]camel-metrics
Enables you to collect various metrics directly from Camel routes using the Metrics Java library.
MINA mina:tcp://Hostname[:Port][?Options] mina:udp://Hostname[:Port][?Options] mina:multicast://Hostname[:Port][?Options] mina:vm://Hostname[:Port][?Options] camel-mina Working with Apache MINA.
MINA2 mina2:tcp://Hostname[:Port][?Options] mina2:udp://Hostname[:Port][?Options] mina2:vm://Hostname[:Port][?Options] camel-mina2Working with Apache MINA 2.x.
Mock mock:EndpointID camel-core For testing routes and mediation rules using mocks.
MongoDB mongodb:Connection[?Options] camel-mongodb Interacts with MongoDB databases and collections. Offers producer endpoints to perform CRUD-style operations and more against databases and collections, as well as consumer endpoints to listen on collections and dispatch objects to Camel routes.
MQTT mqtt:Name camel-mqtt Component for communicating with MQTT M2M message brokers
MSV msv:LocalOrRemoteResource camel-msv Validates the payload of a message using the MSV Library.
Mustache mustache:TemplateName[?Options] camel-mustacheEnables you to process a message using a Mustache template.
MVEL mvel:TemplateName[?Options] camel-mvelEnables you to process a message using an MVEL template.
MyBatis mybatis:StatementName camel-mybatis Performs a query, poll, insert, update or delete in a relational database using MyBatis.
Nagios nagios://Host[:Port][?Options] camel-nagios Sending passive checks to Nagios using JSendNSCA.
Netty netty:tcp://localhost:99999[?Options] netty:udp://Remotehost:99999/[?Options] camel-netty
Enables you to work with TCP and UDP protocols, using the Java NIO based capabilities offered by Netty version 3.x.
Netty4 netty4:tcp://localhost:99999[?Options] netty4:udp://Remotehost:99999/[?Options] camel-netty4
Enables you to work with TCP and UDP protocols, using the Java NIO based capabilities offered by Netty version 4.x.
Netty HTTP netty-http:http://Hostname[:Port][?Options] camel-netty-httpAn extension to the Netty component, facilitating the HTTP transport, using Netty version 3.x.
Netty4 HTTPnetty4-http:http://Hostname[:Port][?Options]camel-netty4-httpAn extension to the Netty component, facilitating the HTTP transport, using Netty version 4.x.
Olingo2olingo2://Endpoint/ResourcePath[?Options]camel-olingo2
Communicates with OData 2.0 services using Apache Olingo 2.0.
Pax-Logging paxlogging:Appender camel-paxlogging
Receives Pax Logging events in the context of an OSGi container.
POP pop3://[UserName@]Host[:Port][?Options] camel-mail Receives email using POP3 and JavaMail.
Printer lpr://localhost[:Port]/default[?Options] lpr://RemoteHost[:Port]/path/to/printer[?Options] camel-printer Provides a way to direct payloads on a route to a printer.
Properties properties://Key[?Options] camel-properties Facilitates using property placeholders directly in endpoint URI definitions.
Quartz quartz://[GroupName/]TimerName[?Options] quartz://GroupName/TimerName/CronExpression camel-quartz Provides a scheduled delivery of messages using the Quartz scheduler.
Quartz2 quartz2://[GroupName/]TimerName[?Options] quartz2://GroupName/TimerName/CronExpression camel-quartz2Provides a scheduled delivery of messages using the Quartz Scheduler 2.x.
Quickfix quickfix-server:ConfigFile quickfix-client:ConfigFile camel-quickfix Implementation of the QuickFix for Java engine which allow to send/receive FIX messages.
RabbitMQ rabbitmq://Hostname[:Port]/ExchangeName[?Options] camel-rabbitmqEnables you to produce and consume messages from a RabbitMQ instance.
Ref ref:EndpointID camel-core Component for lookup of existing endpoints bound in the Registry.
Restlet restlet:RestletUrl[?Options] camel-restlet Component for consuming and producing Restful resources using Restlet.
RMI rmi://RmiRegistryHost:RmiRegistryPort/RegistryPath camel-rmi Working with RMI.
Routebox routebox:routeboxName[?Options] camel-routebox  
RSS rss:Uri camel-rss Working with ROME for RSS integration, such as consuming an RSS feed.
RNC rnc:LocalOrRemoteResource camel-jing Validates the payload of a message using RelaxNG Compact Syntax.
RNG rng:LocalOrRemoteResource camel-jing Validates the payload of a message using RelaxNG.
Salesforce salesforce:Topic[?Options] camel-salesforceEnables producer and consumer endpoints to communicate with Salesforce using Java DTOs.
SAP sap:[destination:DestinationName|server:ServerName]rfcName[?Options] camel-sapEnables outbound and inbound communication to and from SAP systems using synchronous remote function calls, sRFC.
Chapter 124, SAP NetWeaver sap-netweaver:https://Hostname[:Port]/Path[?Options] camel-sap-netweaverIntegrates with the SAP NetWeaver Gateway using HTTP transports.
Schematronschematron://Path[?Options]camel-schematronValidates XML documents using Schematron.
SEDA seda:EndpointID camel-core Used to deliver messages to a java.util.concurrent.BlockingQueue, useful when creating SEDA style processing pipelines within the same CamelContext.
SERVLET servlet://RelativePath[?Options] camel-servlet Provides HTTP based endpoints for consuming HTTP requests that arrive at a HTTP endpoint and this endpoint is bound to a published Servlet.
ServletListener N/A camel-servletlistenerUsed for bootstrapping Camel applications in Web applications.
SFTP sftp://[Username@]Hostname[:Port]/Directoryname[?Options] camel-ftp Sending and receiving files over SFTP.
Sip sip://User@Hostname[:Port][?Options] sips://User@Hostname[:Port][?Options] camel-sip Publish/subscribe communication capability using the telecom SIP protocol. RFC3903 - Session Initiation Protocol (SIP) Extension for Event
SJMS sjms:[queue:|topic:]destinationName[?Options] camel-sjmsA JMS client for Camel that employs best practices for JMS client creation and configuration.
SMPP smpp://UserInfo@Host[:Port][?Options] camel-smpp To send and receive SMS using Short Messaging Service Center using the JSMPP library.
SMTP smtp://[UserName@]Host[:Port][?Options] camel-mail Sending email using SMTP and JavaMail.
SNMP snmp://Hostname[:Port][?Options] camel-snmp Gives you the ability to poll SNMP capable devices or receive traps.
Solr solr://Hostname[:Port]/Solr[?Options] camel-solr Uses the Solrj client API to interface with an Apache Lucene Solr server.
Splunksplunk://Endpoint[?Options]camel-splunkEnables you to publish events and search for events in Splunk.
Spring Batch spring-batch:Job[?Options] camel-spring-batch To bridge Camel and Spring Batch.
Spring Event spring-event://dummy camel-spring Publishes or consumes Spring ApplicationEvents objects in a Spring context.
Spring Integration spring-integration:DefaultChannelName[?Options] camel-spring-integration The bridge component of Camel and Spring Integration.
Spring LDAP spring-ldap:SpringLdapTemplate[?Options] camel-spring-ldapProvides a Camel wrapper for Spring LDAP.
Spring Redis spring-redis://Hostname[:Port][?Options] camel-spring-redisEnables sending and receiving messages from Redis, which is an advanced key-value store, where keys can contain strings, hashes, lists, sets and sorted sets.
Spring Web Services spring-ws:[MappingType:]Address[?Options] camel-spring-ws Client-side support for accessing web services, and server-side support for creating your own contract-first web services using Spring Web Services.
SQL sql:SqlQueryString[?Options] camel-sql Performing SQL queries using JDBC.
SSH ssh:[Username[:Password]@]Host[:Port][?Options] camel-ssh For sending commands to a SSH server.
StAX stax:ContentHandlerClassName camel-stax Process messages through a SAX ContentHandler.
Stomp stomp:queue:Destination[?Options] camel-stompFor sending messages to or receiving messages from a Stomp compliant broker, such as Apache ActiveMQ.
Stream stream:[in|out|err|header][?Options] camel-stream Read or write to an input/output/error/file stream rather like Unix pipes.
String Template string-template:TemplateURI[?Options] camel-stringtemplate Generates a response using a String Template.
Stub stub:SomeOtherCamelUri camel-core Allows you to stub out some physical middleware endpoint for easier testing or debugging.
Test test:RouterEndpointUri camel-spring Creates a Mock endpoint which expects to receive all the message bodies that could be polled from the given underlying endpoint.
Timer timer:EndpointID[?Options] camel-core A timer endpoint.
Twitter twitter://[Endpoint][?Options] camel-twitter A Twitter endpoint.
UrlRewrite N/A camel-urlrewriteEnables you to plug URL rewrite functionality into the HTTP, HTTP4, Jetty, or AHC components.
Validation validator:LocalOrRemoteResource camel-spring Validates the payload of a message using XML Schema and JAXP Validation.
Velocity velocity:TemplateURI[?Options] camel-velocity Generates a response using an Apache Velocity template.
Vertxvertx:ChannelName[?Options] camel-vertxFor working with the Vertx Event Bus.
VM vm:EndpointID camel-core Used to deliver messages to a java.util.concurrent.BlockingQueue, useful when creating SEDA style processing pipelines within the same JVM.
Weather weather://DummyName[?Options] camel-weatherPolls weather information from Open Weather Map: a site that provides free global weather and forecast information.
Websocket websocket://Hostname[:Port]/Path camel-websocket Communicating with Websocket clients.
XML RPC xmlrpc://ServerURI[?Options] camel-xmlrpcProvides a data format for XML, which allows serialization and deserialization of request messages and response message using Apache XmlRpc's bindary data format.
XML SecurityN/A camel-xmlsecurityGenerate and validate XML signatures as described in the W3C standard XML Signature Syntax and Processing.
XMPP xmpp:Hostname[:Port][/Room] camel-xmpp Working with XMPP and Jabber.
XQuery xquery:TemplateURI camel-saxon Generates a response using an XQuery template.
XSLT xslt:TemplateURI[?Options] camel-spring Enables you to process a message using an XSLT template.
Yammer yammer:[function][?Options] camel-yammerEnables you to interact with the Yammer enterprise social network.
Zookeeper zookeeper://Hostname[:Port]/Path camel-zookeeper Working with ZooKeeper cluster(s).

Chapter 2. ActiveMQ

ActiveMQ Component

The ActiveMQ component allows messages to be sent to a JMS Queue or Topic; or messages to be consumed from a JMS Queue or Topic using Apache ActiveMQ.
This component is based on the JMS Component and uses Spring's JMS support for declarative transactions, using Spring's JmsTemplate for sending and a MessageListenerContainer for consuming. All the options from the JMS component also apply for this component.
To use this component, make sure you have the activemq.jar or activemq-core.jar on your classpath along with any Apache Camel dependencies such as camel-core.jar, camel-spring.jar and camel-jms.jar.
Transacted and caching
See section Transactions and Cache Levels below on JMS page if you are using transactions with JMS as it can impact performance.

URI format

activemq:[queue:|topic:]destinationName
Copy to Clipboard Toggle word wrap
Where destinationName is an ActiveMQ queue or topic name. By default, the destinationName is interpreted as a queue name. For example, to connect to the queue, FOO.BAR, use:
activemq:FOO.BAR
Copy to Clipboard Toggle word wrap
You can include the optional queue: prefix, if you prefer:
activemq:queue:FOO.BAR
Copy to Clipboard Toggle word wrap
To connect to a topic, you must include the topic: prefix. For example, to connect to the topic, Stocks.Prices, use:
activemq:topic:Stocks.Prices
Copy to Clipboard Toggle word wrap

Options

See Options on the JMS component as all these options also apply for this component.

Configuring the Connection Factory

The following test case shows how to add an ActiveMQComponent to the CamelContext using the activeMQComponent() method while specifying the brokerURL used to connect to ActiveMQ.
camelContext.addComponent("activemq", activeMQComponent("vm://localhost?broker.persistent=false"));
Copy to Clipboard Toggle word wrap

Configuring the Connection Factory using Spring XML

You can configure the ActiveMQ broker URL on the ActiveMQComponent as follows
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">

  <camelContext xmlns="http://camel.apache.org/schema/spring">
  </camelContext>


  <bean id="activemq" class="org.apache.activemq.camel.component.ActiveMQComponent">
    <property name="brokerURL" value="tcp://somehost:61616"/>
  </bean>

</beans>
Copy to Clipboard Toggle word wrap

Using connection pooling

When sending to an ActiveMQ broker using Camel it's recommended to use a pooled connection factory to handle efficient pooling of JMS connections, sessions and producers. This is documented in the page ActiveMQ Spring Support.
You can grab Jencks AMQ pool with Maven:
    <dependency>
      <groupId>org.apache.activemq</groupId>
      <artifactId>activemq-pool</artifactId>
      <version>5.3.2</version>
    </dependency>
Copy to Clipboard Toggle word wrap
And then setup the activemq component as follows:
     <bean id="jmsConnectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL" value="tcp://localhost:61616" />
    </bean>

    <bean id="pooledConnectionFactory"    class="org.apache.activemq.pool.PooledConnectionFactory" init-method="start" destroy-method="stop">
        <property name="maxConnections" value="8" />
        <property name="connectionFactory" ref="jmsConnectionFactory" />
    </bean>


    <bean id="jmsConfig" class="org.apache.camel.component.jms.JmsConfiguration">
        <property name="connectionFactory" ref="pooledConnectionFactory"/>
        <property name="concurrentConsumers" value="10"/>
    </bean>

    <bean id="activemq" class="org.apache.activemq.camel.component.ActiveMQComponent">
        <property name="configuration" ref="jmsConfig"/>
    </bean>
Copy to Clipboard Toggle word wrap
Note
Notice the init and destroy methods on the pooled connection factory. This is important to ensure the connection pool is properly started and shutdown.
The PooledConnectionFactory will then create a connection pool with up to 8 connections in use at the same time. Each connection can be shared by many sessions. There is an option named maxActive you can use to configure the maximum number of sessions per connection; the default value is 500. From ActiveMQ 5.7 onwards the option has been renamed to better reflect its purpose, being named as maxActiveSessionPerConnection. Notice the concurrentConsumers is set to a higher value than maxConnections is. This is okay, as each consumer is using a session, and as a session can share the same connection, we are in the safe. In this example we can have 8 * 500 = 4000 active sessions at the same time.

Invoking MessageListener POJOs in a route

The ActiveMQ component also provides a helper Type Converter from a JMS MessageListener to a Processor. This means that the Bean component is capable of invoking any JMS MessageListener bean directly inside any route.
So for example you can create a MessageListener in JMS as follows:
public class MyListener implements MessageListener {
   public void onMessage(Message jmsMessage) {
       // ...
   }
}
Copy to Clipboard Toggle word wrap
Then use it in your route as follows
from("file://foo/bar").
  bean(MyListener.class);
Copy to Clipboard Toggle word wrap
That is, you can reuse any of the Apache Camel Components and easily integrate them into your JMS MessageListener POJO\!

Using ActiveMQ Destination Options

Available as of ActiveMQ 5.6
You can configure the Destination Options in the endpoint uri, using the "destination." prefix. For example to mark a consumer as exclusive, and set its prefetch size to 50, you can do as follows:
<camelContext xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="file://src/test/data?noop=true"/>
    <to uri="activemq:queue:foo"/>
  </route>
  <route>
    <!-- use consumer.exclusive ActiveMQ destination option, notice we have to prefix with destination. -->
    <from uri="activemq:foo?destination.consumer.exclusive=true&estination.consumer.prefetchSize=50"/>
    <to uri="mock:results"/>
  </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Consuming Advisory Messages

ActiveMQ can generate Advisory messages which are put in topics that you can consume. Such messages can help you send alerts in case you detect slow consumers or to build statistics (number of messages/produced per day, etc.) The following Spring DSL example shows you how to read messages from a topic.
<route>
	<from uri="activemq:topic:ActiveMQ.Advisory.Connection?mapJmsMessage=false" />
	<convertBodyTo type="java.lang.String"/>
	<transform>
	     <simple>${in.body}&#13;</simple>
	</transform>
	<to uri="file://data/activemq/?fileExist=Append&ileName=advisoryConnection-${date:now:yyyyMMdd}.txt" />
</route>

Copy to Clipboard Toggle word wrap
If you consume a message on a queue, you should see the following files under data/activemq folder :
advisoryConnection-20100312.txt advisoryProducer-20100312.txt
and containing string:
      ActiveMQMessage {commandId = 0, responseRequired = false, messageId = ID:dell-charles-3258-1268399815140
      -1:0:0:0:221, originalDestination = null, originalTransactionId = null, producerId = ID:dell-charles-
      3258-1268399815140-1:0:0:0, destination = topic://ActiveMQ.Advisory.Connection, transactionId = null, 
      expiration = 0, timestamp = 0, arrival = 0, brokerInTime = 1268403383468, brokerOutTime = 1268403383468, 
      correlationId = null, replyTo = null, persistent = false, type = Advisory, priority = 0, groupID = null, 
      groupSequence = 0, targetConsumerId = null, compressed = false, userID = null, content = null, 
      marshalledProperties = org.apache.activemq.util.ByteSequence@17e2705, dataStructure = ConnectionInfo 
      {commandId = 1, responseRequired = true, connectionId = ID:dell-charles-3258-1268399815140-2:50, 
      clientId = ID:dell-charles-3258-1268399815140-14:0, userName = , password = *****, 
      brokerPath = null, brokerMasterConnector = false, manageable = true, clientMaster = true}, 
      redeliveryCounter = 0, size = 0, properties = {originBrokerName=master, originBrokerId=ID:dell-charles-
      3258-1268399815140-0:0, originBrokerURL=vm://master}, readOnlyProperties = true, readOnlyBody = true, 
      droppable = false}
Copy to Clipboard Toggle word wrap

Getting Component JAR

You need this dependency:
  • activemq-camel
ActiveMQ is an extension of the JMS component released with the ActiveMQ project.
<dependency>
  <groupId>org.apache.activemq</groupId>
  <artifactId>activemq-camel</artifactId>
  <version>5.6.0</version>
</dependency>
Copy to Clipboard Toggle word wrap

Chapter 3. AHC

Async Http Client (AHC) Component

Available as of Camel 2.8
The ahc: component provides HTTP based endpoints for consuming external HTTP resources (as a client to call external servers using HTTP). The component uses the Async Http Client library.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-ahc</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

ahc:http://hostname[:port][/resourceUri][?options]
ahc:https://hostname[:port][/resourceUri][?options]
Copy to Clipboard Toggle word wrap
Will by default use port 80 for HTTP and 443 for HTTPS.
You can append query options to the URI in the following format, ?option=value&option=value&...

AhcEndpoint Options

Expand
Name Default Value Description
throwExceptionOnFailure true Option to disable throwing the AhcOperationFailedException in case of failed responses from the remote server. This allows you to get all responses regardless of the HTTP status code.
bridgeEndpoint false If the option is true, then the Exchange.HTTP_URI header is ignored, and use the endpoint's URI for request. You may also set the throwExcpetionOnFailure to be false to let the AhcProducer send all the fault response back.
transferException false If enabled and an Exchange failed processing on the consumer side, and if the caused Exception was send back serialized in the response as a application/x-java-serialized-object content type (for example using Jetty or Servlet Camel components). On the producer side the exception will be deserialized and thrown as is, instead of the AhcOperationFailedException. The caused exception is required to be serialized.
client null To use a custom com.ning.http.client.AsyncHttpClient.
clientConfig null To configure the AsyncHttpClient to use a custom com.ning.http.client.AsyncHttpClientConfig.
clientConfig.x null To configure additional properties of the com.ning.http.client.AsyncHttpClientConfig instance used by the endpoint. Note that configuration options set using this parameter will be merged with those set using the clientConfig parameter or the instance set at the component level with properties set using this parameter taking priority.
clientConfig.realm.x null Camel 2.11: To configure realm properties of the com.ning.http.client.AsyncHttpClientConfig The options which can be used are the options from com.ning.http.client.Realm.RealmBuilder. eg to set scheme, you can configure "clientConfig.realm.scheme=DIGEST"
binding null To use a custom org.apache.camel.component.ahc.AhcBinding.
sslContextParameters null Camel 2.9: Reference to a org.apache.camel.util.jsse.SSLContextParameters in the CAMEL:Registry. This reference overrides any configured SSLContextParameters at the component level. See Using the JSSE Configuration Utility. Note that configuring this option will override any SSL/TLS configuration options provided through the clientConfig option at the endpoint or component level.
bufferSize 4096 Camel 2.10.3: The initial in-memory buffer size used when transferring data between Camel and AHC Client.

AhcComponent Options

Expand
Name Default Value Description
client null To use a custom com.ning.http.client.AsyncHttpClient.
clientConfig null To configure the AsyncHttpClients use a custom com.ning.http.client.AsyncHttpClientConfig.
binding null To use a custom org.apache.camel.component.ahc.AhcBinding.
sslContextParameters null Camel 2.9: To configure custom SSL/TLS configuration options at the component level. See Using the JSSE Configuration Utility for more details. Note that configuring this option will override any SSL/TLS configuration options provided through the clientConfig option at the endpoint or component level.
Notice that setting any of the options on the AhcComponent will propagate those options to AhcEndpoints being created. However the AhcEndpoint can also configure/override a custom option. Options set on endpoints will always take precedence over options from the AhcComponent.

Message Headers

Expand
Name Type Description
Exchange.HTTP_URI String URI to call. Will override existing URI set directly on the endpoint.
Exchange.HTTP_PATH String Request URI's path, the header will be used to build the request URI with the HTTP_URI. If the path is start with "/", http producer will try to find the relative path based on the Exchange.HTTP_BASE_URI header or the exchange.getFromEndpoint().getEndpointUri();
Exchange.HTTP_QUERY String URI parameters. Will override existing URI parameters set directly on the endpoint.
Exchange.HTTP_RESPONSE_CODE int The HTTP response code from the external server. Is 200 for OK.
Exchange.HTTP_CHARACTER_ENCODING String Character encoding.
Exchange.CONTENT_TYPE String The HTTP content type. Is set on both the IN and OUT message to provide a content type, such as text/html.
Exchange.CONTENT_ENCODING String The HTTP content encoding. Is set on both the IN and OUT message to provide a content encoding, such as gzip.

Message Body

Camel will store the HTTP response from the external server on the OUT body. All headers from the IN message will be copied to the OUT message, so headers are preserved during routing. Additionally Camel will add the HTTP response headers as well to the OUT message headers.

Response code

Camel will handle according to the HTTP response code:
  • Response code is in the range 100..299, Camel regards it as a success response.
  • Response code is in the range 300..399, Camel regards it as a redirection response and will throw a AhcOperationFailedException with the information.
  • Response code is 400+, Camel regards it as an external server failure and will throw a AhcOperationFailedException with the information. The option, throwExceptionOnFailure, can be set to false to prevent the AhcOperationFailedException from being thrown for failed response codes. This allows you to get any response from the remote server.

AhcOperationFailedException

This exception contains the following information:
  • The HTTP status code
  • The HTTP status line (text of the status code)
  • Redirect location, if server returned a redirect
  • Response body as a java.lang.String, if server provided a body as response

Calling using GET or POST

The following algorithm is used to determine if either GET or POST HTTP method should be used: 1. Use method provided in header. 2. GET if query string is provided in header. 3. GET if endpoint is configured with a query string. 4. POST if there is data to send (body is not null). 5. GET otherwise.

Configuring URI to call

You can set the HTTP producer's URI directly form the endpoint URI. In the route below, Camel will call out to the external server, oldhost, using HTTP.
from("direct:start")
	    .to("ahc:http://oldhost");
Copy to Clipboard Toggle word wrap
And the equivalent Spring sample:
<camelContext xmlns="http://activemq.apache.org/camel/schema/spring">
  <route>
    <from uri="direct:start"/>
    <to uri="ahc:http://oldhost"/>
  </route>
</camelContext>
Copy to Clipboard Toggle word wrap
You can override the HTTP endpoint URI by adding a header with the key, Exchange.HTTP_URI, on the message.
from("direct:start")
    .setHeader(Exchange.HTTP_URI, constant("http://newhost"))
    .to("ahc:http://oldhost");
Copy to Clipboard Toggle word wrap

Configuring URI Parameters

The ahc producer supports URI parameters to be sent to the HTTP server. The URI parameters can either be set directly on the endpoint URI or as a header with the key Exchange.HTTP_QUERY on the message.
from("direct:start")
	    .to("ahc:http://oldhost?order=123&detail=short");
Copy to Clipboard Toggle word wrap
Or options provided in a header:
from("direct:start")
            .setHeader(Exchange.HTTP_QUERY, constant("order=123&detail=short"))
	    .to("ahc:http://oldhost");
Copy to Clipboard Toggle word wrap
The HTTP component provides a way to set the HTTP request method by setting the message header. Here is an example;
from("direct:start")
            .setHeader(Exchange.HTTP_METHOD, constant("POST"))
	    .to("ahc:http://www.google.com")
            .to("mock:results");
Copy to Clipboard Toggle word wrap
And the equivalent Spring sample:
<camelContext xmlns="http://activemq.apache.org/camel/schema/spring">
  <route>
    <from uri="direct:start"/>
    <setHeader headerName="CamelHttpMethod">
        <constant>POST</constant>
    </setHeader>
    <to uri="ahc:http://www.google.com"/>
    <to uri="mock:results"/>
  </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Configuring charset

If you are using POST to send data you can configure the charset using the Exchange property:
exchange.setProperty(Exchange.CHARSET_NAME, "iso-8859-1");
Copy to Clipboard Toggle word wrap

URI Parameters from the endpoint URI

In this sample we have the complete URI endpoint that is just what you would have typed in a web browser. Multiple URI parameters can of course be set using the & character as separator, just as you would in the web browser. Camel does no tricks here.
// we query for Camel at the Google page
template.sendBody("ahc:http://www.google.com/search?q=Camel", null);
Copy to Clipboard Toggle word wrap

URI Parameters from the Message

Map headers = new HashMap();
headers.put(Exchange.HTTP_QUERY, "q=Camel&lr=lang_en");
// we query for Camel and English language at Google
template.sendBody("ahc:http://www.google.com/search", null, headers);
Copy to Clipboard Toggle word wrap
In the header value above notice that it should not be prefixed with ? and you can separate parameters as usual with the & char.

Getting the Response Code

You can get the HTTP response code from the AHC component by getting the value from the Out message header with Exchange.HTTP_RESPONSE_CODE.
Exchange exchange = template.send("ahc:http://www.google.com/search", new Processor() {
            public void process(Exchange exchange) throws Exception {
                exchange.getIn().setHeader(Exchange.HTTP_QUERY, constant("hl=en&q=activemq"));
            }
   });
   Message out = exchange.getOut();
   int responseCode = out.getHeader(Exchange.HTTP_RESPONSE_CODE, Integer.class);
Copy to Clipboard Toggle word wrap

Configuring AsyncHttpClient

The AsyncHttpClient client uses a AsyncHttpClientConfig to configure the client. See the documentation at Async Http Client for more details.
The example below shows how to use a builder to create the AsyncHttpClientConfig which we configure on the AhcComponent.
// create a client config builder
AsyncHttpClientConfig.Builder builder = new AsyncHttpClientConfig.Builder();
// use the builder to set the options we want, in this case we want to follow redirects and try
// at most 3 retries to send a request to the host
AsyncHttpClientConfig config = builder.setFollowRedirects(true).setMaxRequestRetry(3).build();

// lookup AhcComponent
AhcComponent component = context.getComponent("ahc", AhcComponent.class);
// and set our custom client config to be used
component.setClientConfig(config);
Copy to Clipboard Toggle word wrap
In Camel 2.9, the AHC component uses Async HTTP library 1.6.4. This newer version provides added support for plain bean style configuration. The AsyncHttpClientConfigBean class provides getters and setters for the configuration options available in AsyncHttpClientConfig. An instance of AsyncHttpClientConfigBean may be passed directly to the AHC component or referenced in an endpoint URI using the clientConfig URI parameter.
Also available in Camel 2.9 is the ability to set configuration options directly in the URI. URI parameters starting with "clientConfig." can be used to set the various configurable properties of AsyncHttpClientConfig. The properties specified in the endpoint URI are merged with those specified in the configuration referenced by the "clientConfig" URI parameter with those being set using the "clientConfig." parameter taking priority. The AsyncHttpClientConfig instance referenced is always copied for each endpoint such that settings on one endpoint will remain independent of settings on any previously created endpoints. The example below shows how to configure the AHC component using the "clientConfig." type URI parameters.
from("direct:start")
    .to("ahc:http://localhost:8080/foo?clientConfig.maxRequestRetry=3&clientConfig.followRedirects=true")
Copy to Clipboard Toggle word wrap

SSL Support (HTTPS)

Using the JSSE Configuration Utility

As of Camel 2.9, the AHC component supports SSL/TLS configuration through the Camel JSSE Configuration Utility.  This utility greatly decreases the amount of component specific code you need to write and is configurable at the endpoint and component levels. The following examples demonstrate how to use the utility with the AHC component.

Programmatic configuration of the component

KeyStoreParameters ksp = new KeyStoreParameters();
ksp.setResource("/users/home/server/keystore.jks");
ksp.setPassword("keystorePassword");

KeyManagersParameters kmp = new KeyManagersParameters();
kmp.setKeyStore(ksp);
kmp.setKeyPassword("keyPassword");

SSLContextParameters scp = new SSLContextParameters();
scp.setKeyManagers(kmp);

AhcComponent component = context.getComponent("ahc", AhcComponent.class);
component.setSslContextParameters(scp));
Copy to Clipboard Toggle word wrap

Spring DSL based configuration of endpoint

...
  <camel:sslContextParameters
      id="sslContextParameters">
    <camel:keyManagers
        keyPassword="keyPassword">
      <camel:keyStore
          resource="/users/home/server/keystore.jks"
          password="keystorePassword"/>
    </camel:keyManagers>
  </camel:sslContextParameters>...
...
  <to uri="ahc:https://localhost/foo?sslContextParameters=#sslContextParameters"/>
...
Copy to Clipboard Toggle word wrap

Chapter 4. AHC-WS

Async Http Client (AHC) Websocket Client Component

Available as of Camel 2.14
The ahc-ws component provides Websocket based endpoints for a client communicating with external servers over Websocket (as a client opening a websocket connection to an external server). The component uses the Chapter 3, AHC component that in turn uses the Async Http Client library.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-ahc-ws</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI Format

ahc-ws://hostname[:port][/resourceUri][?options]
ahc-wss://hostname[:port][/resourceUri][?options]
Copy to Clipboard Toggle word wrap
Will by default use port 80 for ahc-ws and 443 for ahc-wss.

AHC-WS Options

As the AHC-WS component is based on the AHC component, you can use the various configuration options of the AHC component.

Writing and Reading Data over Websocket

An ahc-ws endpoint can either write data to the socket or read from the socket, depending on whether the endpoint is configured as the producer or the consumer, respectively.

Configuring URI to Write or Read Data

In the route below, Camel will write to the specified websocket connection.
from("direct:start")
	    .to("ahc-ws://targethost");
Copy to Clipboard Toggle word wrap
And the equivalent Spring sample:
<camelContext xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="direct:start"/>
    <to uri="ahc-ws://targethost"/>
  </route>
</camelContext>
Copy to Clipboard Toggle word wrap
In the route below, Camel will read from the specified websocket connection.
from("ahc-ws://targethost")
	    .to("direct:next");
Copy to Clipboard Toggle word wrap
And the equivalent Spring sample:
<camelContext xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="ahc-ws://targethost"/>
    <to uri="direct:next"/>
  </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Chapter 5. AMQP

AMQP

The AMQP component supports the AMQP protocol via the Qpid project.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-ampq</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

Copy to Clipboard Toggle word wrap

URI format

amqp:[queue:|topic:]destinationName[?options]
Copy to Clipboard Toggle word wrap
You can specify all of the various configuration options of the JMS component after the destination name.

Chapter 6. APNS

Apns Component

Available as of Camel 2.8
The apns component is used for sending notifications to iOS devices. The apns components use javapns library. The component supports sending notifications to Apple Push Notification Servers (APNS) and consuming feedback from the servers.
The consumer is configured with a default polling time of 3600 seconds. It is advisable to consume the feedback stream from Apple Push Notification Servers regularly at larger intervals to avoid flooding the servers.
The feedback stream gives information about inactive devices. This information can be consumed infrequently (every two or three hours) if your mobile application is not heavily used.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-apns</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

Copy to Clipboard Toggle word wrap

URI format

To send notifications:
apns:notify[?options]

Copy to Clipboard Toggle word wrap
To consume feedback:
apns:consumer[?options]

Copy to Clipboard Toggle word wrap

Options

Producer

Expand
Property Default Description
tokens Empty by default. Configure this property in case you want to statically declare tokens related to devices you want to notify. Tokens are separated by comma.

Consumer

Expand
Property Default Description
delay 3600 Delay in seconds between each poll.
initialDelay 10 Seconds before polling starts.
timeUnit SECONDS Time Unit for polling.
userFixedDelay true If true, use fixed delay between pools, otherwise fixed rate is used. See ScheduledExecutorService in JDK for details.
You can append query options to the URI in the following format, ?option=value&option=value&...

Component

The ApnsComponent must be configured with a com.notnoop.apns.ApnsService. The service can be created and configured using the org.apache.camel.component.apns.factory.ApnsServiceFactory. See further below for an example. For further information, see the test source code.

Exchange data format

When Camel fetches feedback data corresponding to inactive devices, it retrieves a List of InactiveDevice objects. Each InactiveDevice object on the retrieved list will be set as the In body, and then processed by the consumer endpoint.

Message Headers

Camel Apns uses these headers.
Expand
Property Default Description
CamelApnsTokens Empty by default.
CamelApnsMessageType STRING, PAYLOAD If you choose PAYLOAD as the message type, the message will be considered an APNS payload and sent as is. If you choose STRING, the message will be converted to an APNS payload

ApnsServiceFactory Builder Callback

ApnsServiceFactory comes with an empty callback method that can be used to configure or replace the default ApnsServiceBuilder instance. The method has the following format:
protected ApnsServiceBuilder configureServiceBuilder(ApnsServiceBuilder serviceBuilder);
Copy to Clipboard Toggle word wrap
It is used in the following way:
ApnsServiceFactory proxiedApnsServiceFactory = new ApnsServiceFactory(){

  @Override
  protected ApnsServiceBuilder configureServiceBuilder(ApnsServiceBuilder serviceBuilder) {
    return serviceBuilder.withSocksProxy("my.proxy.com", 6666);
  }

};
Copy to Clipboard Toggle word wrap

Samples

Camel Xml route

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:camel="http://camel.apache.org/schema/spring"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
        http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">

	<!-- Replace by desired values -->
	<bean id="apnsServiceFactory" class="org.apache.camel.component.apns.factory.ApnsServiceFactory">

		<!-- Optional configuration of feedback host and port -->
		<!-- <property name="feedbackHost" value="localhost" /> -->
		<!-- <property name="feedbackPort" value="7843" /> -->

		<!-- Optional configuration of gateway host and port -->
		<!-- <property name="gatewayHost" value="localhost" /> -->
		<!-- <property name="gatewayPort" value="7654" /> -->

		<!-- Declaration of certificate used -->
                <!-- from Camel 2.11 onwards you can use prefix: classpath:, file: to refer to load the certificate from classpath or file. Default it classpath -->
		<property name="certificatePath" value="certificate.p12" />
		<property name="certificatePassword" value="MyCertPassword" />

		<!-- Optional connection strategy - By Default: No need to configure -->
		<!-- Possible options: NON_BLOCKING, QUEUE, POOL or Nothing -->
		<!-- <property name="connectionStrategy" value="POOL" /> -->
		<!-- Optional pool size -->
		<!-- <property name="poolSize" value="15" /> -->

		<!-- Optional connection strategy - By Default: No need to configure -->
		<!-- Possible options: EVERY_HALF_HOUR, EVERY_NOTIFICATION or Nothing (Corresponds to NEVER javapns option) -->
		<!-- <property name="reconnectionPolicy" value="EVERY_HALF_HOUR" /> -->
	</bean>

	<bean id="apnsService" factory-bean="apnsServiceFactory" factory-method="getApnsService" />

	<!-- Replace this declaration by wanted configuration -->
	<bean id="apns" class="org.apache.camel.component.apns.ApnsComponent">
		<property name="apnsService" ref="apnsService" />
	</bean>

	<camelContext id="camel-apns-test" xmlns="http://camel.apache.org/schema/spring">
        	<route id="apns-test">
                	<from uri="apns:consumer?initialDelay=10&elay=3600&imeUnit=SECONDS" />
        	        <to uri="log:org.apache.camel.component.apns?showAll=true&ultiline=true" />
                	<to uri="mock:result" />
        	</route>
	</camelContext>

</beans>

Copy to Clipboard Toggle word wrap

Camel Java route

    protected CamelContext createCamelContext() throws Exception {
        CamelContext camelContext = super.createCamelContext();

        ApnsServiceFactory apnsServiceFactory = new ApnsServiceFactory();
        apnsServiceFactory.setCertificatePath("classpath:/certificate.p12");
        apnsServiceFactory.setCertificatePassword("MyCertPassword");

        ApnsService apnsService = apnsServiceFactory.getApnsService(camelContext);

        ApnsComponent apnsComponent = new ApnsComponent(apnsService);
        camelContext.addComponent("apns", apnsComponent);

        return camelContext;
    }

Copy to Clipboard Toggle word wrap
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            public void configure() throws Exception {
                from("direct:test")
                    .setHeader(ApnsConstants.HEADER_TOKENS, constant(IOS_DEVICE_TOKEN))
                    .to("apns:notify");
                }
        }
    }

Copy to Clipboard Toggle word wrap
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            public void configure() throws Exception {
                from("direct:test").
                to("apns:notify?tokens=" + IOS_DEVICE_TOKEN);
            }
        };
    }

Copy to Clipboard Toggle word wrap

ApnsConsumer

from("apns:consumer?initialDelay=10&delay=3600&timeUnit=SECONDS")
    .to("log:com.apache.camel.component.apns?showAll=true&multiline=true")
    .to("mock:result");

Copy to Clipboard Toggle word wrap

See Also

Chapter 7. Atmosphere-Websocket

Atmosphere Websocket Servlet Component

Available as of Camel 2.14
The atmosphere-websocket: component provides Websocket based endpoints for a servlet communicating with external clients over Websocket (as a servlet accepting websocket connections from external clients). The component uses the Chapter 128, SERVLET component and uses the Atmosphere library to support the Websocket transport in various Servlet containers (e..g., Jetty, Tomcat, ...).
Unlike the Chapter 159, Websocket component that starts the embedded Jetty server, this component uses the servlet provider of the container.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-atmosphere-websocket</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI Format

atmosphere-websocket:///relative path[?options]
Copy to Clipboard Toggle word wrap

Reading and Writing Data over Websocket

An atmopshere-websocket endpoint can either write data to the socket or read from the socket, depending on whether the endpoint is configured as the producer or the consumer, respectively.

Configuring URI to Read or Write Data

In the route below, Camel will read from the specified websocket connection.
from("atmosphere-websocket:///servicepath")
	    .to("direct:next");
Copy to Clipboard Toggle word wrap
And the equivalent Spring sample:
<camelContext xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="atmosphere-websocket:///servicepath"/>
    <to uri="direct:next"/>
  </route>
</camelContext>
Copy to Clipboard Toggle word wrap
In the route below, Camel will read from the specified websocket connection.
from("direct:next")
	    .to("atmosphere-websocket:///servicepath");
Copy to Clipboard Toggle word wrap
And the equivalent Spring sample:
<camelContext xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="direct:next"/>
    <to uri="atmosphere-websocket:///servicepath"/>
  </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Chapter 8. Atom

Atom Component

The atom: component is used for polling atom feeds.
Apache Camel will poll the feed every 500 milliseconds by default. Note: The component currently supports only polling (consuming) feeds.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-atom</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

Copy to Clipboard Toggle word wrap

URI format

atom://atomUri[?options]
Copy to Clipboard Toggle word wrap
Where atomUri is the URI to the Atom feed to poll.

Options

Expand
Property Default Description
splitEntries true If true Apache Camel will poll the feed and for the subsequent polls return each entry poll by poll. If the feed contains 7 entries then Apache Camel will return the first entry on the first poll, the 2nd entry on the next poll, until no more entries where as Apache Camel will do a new update on the feed. If false then Apache Camel will poll a fresh feed on every invocation.
filter true Is only used by the split entries to filter the entries to return. Apache Camel will default use the UpdateDateFilter that only return new entries from the feed. So the client consuming from the feed never receives the same entry more than once. The filter will return the entries ordered by the newest last.
lastUpdate null Is only used by the filter, as the starting timestamp for selection never entries (uses the entry.updated timestamp). Syntax format is: yyyy-MM-ddTHH:MM:ss. Example: 2007-12-24T17:45:59.
throttleEntries true Camel 2.5: Sets whether all entries identified in a single feed poll should be delivered immediately. If true, only one entry is processed per consumer.delay. Only applicable when splitEntries is set to true.
feedHeader true Sets whether to add the Abdera Feed object as a header.
sortEntries false If splitEntries is true, this sets whether to sort those entries by updated date.
consumer.delay 500 Delay in millis between each poll.
consumer.initialDelay 1000 Millis before polling starts.
consumer.userFixedDelay false If true, use fixed delay between pools, otherwise fixed rate is used. See ScheduledExecutorService in JDK for details.
You can append query options to the URI in the following format, ?option=value&option=value&...

Exchange data format

Apache Camel will set the In body on the returned Exchange with the entries. Depending on the splitEntries flag Apache Camel will either return one Entry or a List<Entry>.
Expand
Option Value Behavior
splitEntries true Only a single entry from the currently being processed feed is set: exchange.in.body(Entry)
splitEntries false The entire list of entries from the feed is set: exchange.in.body(List<Entry>)
Apache Camel can set the Feed object on the in header (see feedHeader option to disable this):

Message Headers

Apache Camel atom uses these headers.
Expand
Header Description
CamelAtomFeed Apache Camel 2.0: When consuming the org.apache.abdera.model.Feed object is set to this header.

Samples

In the following sample we poll James Strachan's blog:
from("atom://http://macstrac.blogspot.com/feeds/posts/default").to("seda:feeds");
Copy to Clipboard Toggle word wrap
In this sample we want to filter only good blogs we like to a SEDA queue. The sample also shows how to set up Apache Camel standalone, not running in any container or using Spring.
@Override
protected CamelContext createCamelContext() throws Exception {
    // First we register a blog service in our bean registry
    SimpleRegistry registry = new SimpleRegistry();
    registry.put("blogService", new BlogService());

    // Then we create the camel context with our bean registry
    context = new DefaultCamelContext(registry);

    // Then we add all the routes we need using the route builder DSL syntax
    context.addRoutes(createMyRoutes());

    // And finally we must start Camel to let the magic routing begins
    context.start();

    return context;
}

/**
 * This is the route builder where we create our routes using the Camel DSL syntax
 */
protected RouteBuilder createMyRoutes() throws Exception {
    return new RouteBuilder() {
        public void configure() throws Exception {
            // We pool the atom feeds from the source for further processing in the seda queue
            // we set the delay to 1 second for each pool.
            // Using splitEntries=true will during polling only fetch one Atom Entry at any given time.
            // As the feed.atom file contains 7 entries, using this will require 7 polls to fetch the entire
            // content. When Camel have reach the end of entries it will refresh the atom feed from URI source
            // and restart - but as Camel by default uses the UpdatedDateFilter it will only deliver new
            // blog entries to "seda:feeds". So only when James Strachan updates his blog with a new entry
            // Camel will create an exchange for the seda:feeds.
            from("atom:file:src/test/data/feed.atom?splitEntries=true&consumer.delay=1000").to("seda:feeds");

            // From the feeds we filter each blot entry by using our blog service class
            from("seda:feeds").filter().method("blogService", "isGoodBlog").to("seda:goodBlogs");

            // And the good blogs is moved to a mock queue as this sample is also used for unit testing
            // this is one of the strengths in Camel that you can also use the mock endpoint for your
            // unit tests
            from("seda:goodBlogs").to("mock:result");
        }
    };
}

/**
 * This is the actual junit test method that does the assertion that our routes is working
 * as expected
 */
@Test
public void testFiltering() throws Exception {
    // create and start Camel
    context = createCamelContext();
    context.start();

    // Get the mock endpoint
    MockEndpoint mock = context.getEndpoint("mock:result", MockEndpoint.class);

    // There should be at least two good blog entries from the feed
    mock.expectedMinimumMessageCount(2);

    // Asserts that the above expectations is true, will throw assertions exception if it failed
    // Camel will default wait max 20 seconds for the assertions to be true, if the conditions
    // is true sooner Camel will continue
    mock.assertIsSatisfied();

    // stop Camel after use
    context.stop();
}

/**
 * Services for blogs
 */
public class BlogService {

    /**
     * Tests the blogs if its a good blog entry or not
     */
    public boolean isGoodBlog(Exchange exchange) {
        Entry entry = exchange.getIn().getBody(Entry.class);
        String title = entry.getTitle();            

        // We like blogs about Camel
        boolean good = title.toLowerCase().contains("camel");
        return good;
    }

}
Copy to Clipboard Toggle word wrap

Chapter 9. avro

Avro Component

Available as of Camel 2.10
This component provides a dataformat for avro, which allows serialization and deserialization of messages using Apache Avro's binary dataformat. Moreover, it provides support for Apache Avro's rpc, by providing producers and consumers endpoint for using avro over netty or http.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-avro</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

Apache Avro Overview

Avro allows you to define message types and a protocol using a json like format and then generate java code for the specified types and messages. An example of how a schema looks like is below.
{"namespace": "org.apache.camel.avro.generated",
 "protocol": "KeyValueProtocol",

 "types": [
     {"name": "Key", "type": "record",
      "fields": [
          {"name": "key",   "type": "string"}
      ]
     },
     {"name": "Value", "type": "record",
      "fields": [
          {"name": "value",   "type": "string"}
      ]
     }
 ],

 "messages": {
     "put": {
         "request": [{"name": "key", "type": "Key"}, {"name": "value", "type": "Value"} ],
         "response": "null"
     },
     "get": {
         "request": [{"name": "key", "type": "Key"}],
         "response": "Value"
     }
 }
}
Copy to Clipboard Toggle word wrap
You can easily generate classes from a schema, using maven, ant etc. More details can be found at the Apache Avro documentation.
However, it doesn't enforce a schema first approach and you can create schema for your existing classes. Since 2.12 you can use existing protocol interfaces to make RCP calls. You should use interface for the protocol itself and POJO beans or primitive/String classes for parameter and result types. Here is an example of the class that corresponds to schema above:
package org.apache.camel.avro.reflection;

public interface KeyValueProtocol {
    void put(String key, Value value);
    Value get(String key);
}

class Value {
    private String value;
    public String getValue() { return value; }
    public void setValue(String value) { this.value = value; }
}
Copy to Clipboard Toggle word wrap
Note: Existing classes can be used only for RPC (see below), not in data format.

Using the Avro data format

Using the avro data format is as easy as specifying that the class that you want to marshal or unmarshal in your route.
    <camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
        <route>
            <from uri="direct:in"/>
            <marshal>
                <avro instanceClass="org.apache.camel.dataformat.avro.Message"/>
            </marshal>
            <to uri="log:out"/>
        </route>
    </camelContext>
Copy to Clipboard Toggle word wrap
An alternative can be to specify the dataformat inside the context and reference it from your route.
    <camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
         <dataFormats>
            <avro id="avro" instanceClass="org.apache.camel.dataformat.avro.Message"/>
        </dataFormats>
        <route>
            <from uri="direct:in"/>
            <marshal ref="avro"/>
            <to uri="log:out"/>
        </route>
    </camelContext>
Copy to Clipboard Toggle word wrap
In the same manner you can umarshal using the avro data format.

Using Avro RPC in Camel

As mentioned above Avro also provides RPC support over multiple transports such as http and netty. Camel provides consumers and producers for these two transports.
avro:[transport]:[host]:[port][?options]
Copy to Clipboard Toggle word wrap
The supported transport values are currently http or netty.
Since 2.12 you can specify message name right in the URI:
avro:[transport]:[host]:[port][/messageName][?options]
Copy to Clipboard Toggle word wrap
For consumers this allows you to have multiple routes attached to the same socket. Dispatching to correct route will be done by the avro component automatically. Route with no messageName specified (if any) will be used as default.
When using camel producers for avro ipc, the "in" message body needs to contain the parameters of the operation specified in the avro protocol. The response will be added in the body of the "out" message.
In a similar manner when using camel avro consumers for avro ipc, the requests parameters will be placed inside the "in" message body of the created exchange and once the exchange is processed the body of the "out" message will be send as a response.
Note: By default consumer parameters are wrapped into array. If you've got only one parameter, since 2.12 you can use singleParameter URI option to receive it direcly in the "in" message body without array wrapping.

Avro RPC URI Options

Expand
Name Version Description
protocolClassName The class name of the avro protocol.
singleParameter 2.12 If true, consumer parameter won't be wrapped into array. Will fail if protocol specifies more then 1 parameter for the message
protocol Avro procol object. Can be used instead of protocolClassName when complex protocol needs to be created. One cane used #name notation to refer beans from the Registry
reflectionProtocol 2.12 If protocol object provided is reflection protocol. Should be used only with protocol parameter because for protocolClassName protocol type will be autodetected

Avro RPC Headers

Expand
Name Description
CamelAvroMessageName The name of the message to send. In consumer overrides message name from URI (if any)

Examples

An example of using camel avro producers via http:
        <route>
            <from uri="direct:start"/>
            <to uri="avro:http:localhost:{{avroport}}?protocolClassName=org.apache.camel.avro.generated.KeyValueProtocol"/>
            <to uri="log:avro"/>
        </route>
Copy to Clipboard Toggle word wrap
In the example above you need to fill CamelAvroMessageName header. Since 2.12 you can use following syntax to call constant messages:
        <route>
            <from uri="direct:start"/>
            <to uri="avro:http:localhost:{{avroport}}/put?protocolClassName=org.apache.camel.avro.generated.KeyValueProtocol"/>
            <to uri="log:avro"/>
        </route>
Copy to Clipboard Toggle word wrap
An example of consuming messages using camel avro consumers via Netty:
        <route>
            <from uri="avro:netty:localhost:{{avroport}}?protocolClassName=org.apache.camel.avro.generated.KeyValueProtocol"/>
            <choice>
                <when>
                    <el>${in.headers.CamelAvroMessageName == 'put'}</el>
                    <process ref="putProcessor"/>
                </when>
                <when>
                    <el>${in.headers.CamelAvroMessageName == 'get'}</el>
                    <process ref="getProcessor"/>
                </when>
            </choice>
        </route>
Copy to Clipboard Toggle word wrap
Since 2.12 you can set up two distinct routes to perform the same task:
        <route>
            <from uri="avro:netty:localhost:{{avroport}}/put?protocolClassName=org.apache.camel.avro.generated.KeyValueProtocol">
            <process ref="putProcessor"/>
        </route>
        <route>
            <from uri="avro:netty:localhost:{{avroport}}/get?protocolClassName=org.apache.camel.avro.generated.KeyValueProtocol&singleParameter=true"/>
            <process ref="getProcessor"/>
        </route>
Copy to Clipboard Toggle word wrap
In the example above, get takes only one parameter, so singleParameter is used and getProcessor will receive Value class directly in body, while putProcessor will receive an array of size 2 with String key and Value value filled as array contents.

Chapter 10. AWS

10.1. Introduction to the AWS Components

Camel Components for Amazon Web Services

The Camel Components for Amazon Web Services provide connectivity to AWS services from Camel.
Expand
AWS service Camel component Camel Version Component description
Simple Queue Service (SQS) AWS-SQS 2.6 Supports sending and receiving messages using SQS
Simple Notification Service (SNS) AWS-SNS 2.8 Supports sending messages using SNS
Simple Storage Service (S3) AWS-S3 2.8 Supports storing and retrieving of objects using S3
Simple Email Service (SES) AWS-SES 2.8.4 Supports sending emails using SES
SimpleDB AWS-SDB 2.8.4 Supports storing retrieving data to/from SDB
DynamoDB AWS-DDB 2.10.0 Supports storing retrieving data to/from DDB
CloudWatch AWS-CW 2.10.3 Supports sending metrics to CloudWatch
Simple Workflow AWS-SWF 2.13.0 Supports managing workflows with SWF

10.2. AWS-CW

CW Component

*Available as of Camel 2.11
The CW component allows messages to be sent to an Amazon CloudWatch metrics. The implementation of the Amazon API is provided by the AWS SDK.
Prerequisites
You must have a valid Amazon Web Services developer account, and be signed up to use Amazon CloudWatch. More information are available at Amazon CloudWatch.

URI Format

aws-cw://namespace[?options]
Copy to Clipboard Toggle word wrap
The metrics will be created if they don't already exists. You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options

Expand
Name Default Value Context Description
amazonCwClient null Producer Reference to a com.amazonaws.services.cloudwatch.AmazonCloudWatch in the Registry.
accessKey null Producer Amazon AWS Access Key
secretKey null Producer Amazon AWS Secret Key
name null Producer The metric name which is used if the message header 'CamelAwsCwMetricName' is not present.
value 1.0 Producer The metric value which is used if the message header 'CamelAwsCwMetricValue' is not present.
unit Count Producer The metric unit which is used if the message header 'CamelAwsCwMetricUnit' is not present.
namespace null Producer The metric namespace which is used if the message header 'CamelAwsCwMetricNamespace' is not present.
timestamp null Producer The metric timestamp which is used if the message header 'CamelAwsCwMetricTimestamp' is not present.
amazonCwEndpoint null Producer The region with which the AWS-CW client wants to work with.
Required CW component options
You have to provide the amazonCwClient in the Registry or your accessKey and secretKey to access the Amazon's CloudWatch.

Usage

Message headers evaluated by the CW producer

Expand
Header Type Description
CamelAwsCwMetricName String The Amazon CW metric name.
CamelAwsCwMetricValue Double The Amazon CW metric value.
CamelAwsCwMetricUnit String The Amazon CW metric unit.
CamelAwsCwMetricNamespace String The Amazon CW metric namespace.
CamelAwsCwMetricTimestamp Date The Amazon CW metric timestamp.
CamelAwsCwMetricDimensionName String Camel 2.12: The Amazon CW metric dimension name.
CamelAwsCwMetricDimensionValue String Camel 2.12: The Amazon CW metric dimension value.
CamelAwsCwMetricDimensions Map<String, String> Camel 2.12: A map of dimension names and dimension values.

Advanced AmazonCloudWatch configuration

If you need more control over the AmazonCloudWatch instance configuration you can create your own instance and refer to it from the URI:
from("direct:start")
.to("aws-cw://namepsace?amazonCwClient=#client");
Copy to Clipboard Toggle word wrap
The #client refers to a AmazonCloudWatch in the Registry.
For example if your Camel Application is running behind a firewall:
AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");
ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

AmazonCloudWatch client = new AmazonCloudWatchClient(awsCredentials, clientConfiguration);

registry.bind("client", client);
Copy to Clipboard Toggle word wrap

Dependencies

Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Camel (2.10 or higher).

10.3. AWS-DDB

DDB Component

Available as of Camel 2.10
The DynamoDB component supports storing and retrieving data from/to Amazon's DynamoDB service.
Prerequisites
You must have a valid Amazon Web Services developer account, and be signed up to use Amazon DynamoDB. More information are available at Amazon DynamoDB.

URI Format

aws-ddb://domainName[?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options

Expand
Name Default Value Context Description
amazonDDBClient null Producer Reference to a com.amazonaws.services.dynamodb.AmazonDynamoDB in the Registry.
accessKey null Producer Amazon AWS Access Key
secretKey null Producer Amazon AWS Secret Key
amazonDdbEndpoint null Producer The region with which the AWS-DDB client wants to work with.
tableName null Producer The name of the table currently worked with.
readCapacity 0 Producer The provisioned throughput to reserve for reading resources from your table
writeCapacity 0 Producer The provisioned throughput to reserved for writing resources to your table
consistentRead false Producer Determines whether or not strong consistency should be enforced when data is read.
operation PutAttributes Producer Valid values are BatchGetItems, DeleteItem, DeleteTable, DescribeTable, GetItem, PutItem, Query, Scan, UpdateItem, UpdateTable.
Required DDB component options
You have to provide the amazonDDBClient in the Registry or your accessKey and secretKey to access the Amazon's DynamoDB.

Usage

Message headers evaluated by the DDB producer

Expand
Header Type Description
CamelAwsDdbBatchItems Map<String, KeysAndAttributes> A map of the table name and corresponding items to get by primary key.
CamelAwsDdbTableName String Table Name for this operation.
CamelAwsDdbKey Key The primary key that uniquely identifies each item in a table.
CamelAwsDdbReturnValues String Use this parameter if you want to get the attribute name-value pairs before or after they are modified(NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW).
CamelAwsDdbUpdateCondition Map<String, ExpectedAttributeValue> Designates an attribute for a conditional modification.
CamelAwsDdbAttributeNames Collection<String> If attribute names are not specified then all attributes will be returned.
CamelAwsDdbConsistentRead Boolean If set to true, then a consistent read is issued, otherwise eventually consistent is used.
CamelAwsDdbItem Map<String, AttributeValue> A map of the attributes for the item, and must include the primary key values that define the item.
CamelAwsDdbExactCount Boolean If set to true, Amazon DynamoDB returns a total number of items that match the query parameters, instead of a list of the matching items and their attributes.
CamelAwsDdbStartKey Key Primary key of the item from which to continue an earlier query.
CamelAwsDdbHashKeyValue AttributeValue Value of the hash component of the composite primary key.
CamelAwsDdbLimit Integer The maximum number of items to return.
CamelAwsDdbScanRangeKeyCondition Condition A container for the attribute values and comparison operators to use for the query.
CamelAwsDdbScanIndexForward Boolean Specifies forward or backward traversal of the index.
CamelAwsDdbScanFilter Map<String, Condition> Evaluates the scan results and returns only the desired values.
CamelAwsDdbUpdateValues Map<String, AttributeValueUpdate> Map of attribute name to the new value and action for the update.

Message headers set during BatchGetItems operation

Expand
Header Type Description
CamelAwsDdbBatchResponse Map<String,BatchResponse> Table names and the respective item attributes from the tables.
CamelAwsDdbUnprocessedKeys Map<String,KeysAndAttributes> Contains a map of tables and their respective keys that were not processed with the current response.

Message headers set during DeleteItem operation

Expand
Header Type Description
CamelAwsDdbAttributes Map<String, AttributeValue> The list of attributes returned by the operation.

Message headers set during DeleteTable operation

Expand
Header Type Description
CamelAwsDdbProvisionedThroughput ProvisionedThroughputDescription The value of the ProvisionedThroughput property for this table
CamelAwsDdbCreationDate Date Creation DateTime of this table.
CamelAwsDdbTableItemCount Long Item count for this table.
CamelAwsDdbKeySchema KeySchema The KeySchema that identifies the primary key for this table.
CamelAwsDdbTableName String The table name.
CamelAwsDdbTableSize Long The table size in bytes.
CamelAwsDdbTableStatus String The status of the table: CREATING, UPDATING, DELETING, ACTIVE

Message headers set during DescribeTable operation

Expand
Header Type Description
CamelAwsDdbProvisionedThroughput {{ProvisionedThroughputDescription} The value of the ProvisionedThroughput property for this table
CamelAwsDdbCreationDate Date Creation DateTime of this table.
CamelAwsDdbTableItemCount Long Item count for this table.
CamelAwsDdbKeySchema {{KeySchema The KeySchema that identifies the primary key for this table.
CamelAwsDdbTableName String The table name.
CamelAwsDdbTableSize Long The table size in bytes.
CamelAwsDdbTableStatus String The status of the table: CREATING, UPDATING, DELETING, ACTIVE
CamelAwsDdbReadCapacity Long ReadCapacityUnits property of this table.
CamelAwsDdbWriteCapacity Long WriteCapacityUnits property of this table.

Message headers set during GetItem operation

Expand
Header Type Description
CamelAwsDdbAttributes Map<String, AttributeValue> The list of attributes returned by the operation.

Message headers set during PutItem operation

Expand
Header Type Description
CamelAwsDdbAttributes Map<String, AttributeValue> The list of attributes returned by the operation.

Message headers set during Query operation

Expand
Header Type Description
CamelAwsDdbItems List<java.util.Map<String,AttributeValue>> The list of attributes returned by the operation.
CamelAwsDdbLastEvaluatedKey Key Primary key of the item where the query operation stopped, inclusive of the previous result set.
CamelAwsDdbConsumedCapacity Double The number of Capacity Units of the provisioned throughput of the table consumed during the operation.
CamelAwsDdbCount Integer Number of items in the response.

Message headers set during Scan operation

Expand
Header Type Description
CamelAwsDdbItems List<java.util.Map<String,AttributeValue>> The list of attributes returned by the operation.
CamelAwsDdbLastEvaluatedKey Key Primary key of the item where the query operation stopped, inclusive of the previous result set.
CamelAwsDdbConsumedCapacity Double The number of Capacity Units of the provisioned throughput of the table consumed during the operation.
CamelAwsDdbCount Integer Number of items in the response.
CamelAwsDdbScannedCount Integer Number of items in the complete scan before any filters are applied.

Message headers set during UpdateItem operation

Expand
Header Type Description
CamelAwsDdbAttributes Map<String, AttributeValue> The list of attributes returned by the operation.

Advanced AmazonDynamoDB configuration

If you need more control over the AmazonDynamoDB instance configuration you can create your own instance and refer to it from the URI:
from("direct:start")
.to("aws-ddb://domainName?amazonDDBClient=#client");
Copy to Clipboard Toggle word wrap
The #client refers to a AmazonDynamoDB in the Registry.
For example if your Camel Application is running behind a firewall:
AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");
ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

AmazonDynamoDB client = new AmazonDynamoDBClient(awsCredentials, clientConfiguration);

registry.bind("client", client);
Copy to Clipboard Toggle word wrap

Dependencies

Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Camel (2.10 or higher).

10.4. AWS-S3

S3 Component

Available as of Camel 2.8
The S3 component supports storing and retrieving objetcs from/to Amazon's S3 service.
Prerequisites
You must have a valid Amazon Web Services developer account, and be signed up to use Amazon S3. More information are available at Amazon S3.

URI Format

aws-s3://bucket-name[?options]
Copy to Clipboard Toggle word wrap
The bucket will be created if it don't already exists. You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options

Expand
Name Default Value Context Description
amazonS3Client null Shared Reference to a com.amazonaws.services.sqs.AmazonS3 in the Registry.
accessKey null Shared Amazon AWS Access Key
secretKey null Shared Amazon AWS Secret Key
amazonS3Endpoint null Shared The region with which the AWS-S3 client wants to work with.
region null Producer The region who the bucket is located. This option is used in the com.amazonaws.services.s3.model.CreateBucketRequest.
deleteAfterRead true Consumer Delete objects from S3 after it has been retrieved.
deleteAfterWrite false Producer Camel 2.11.0 Delete file object after the S3 file has been uploaded
maxMessagesPerPoll 10 Consumer The maximum number of objects which can be retrieved in one poll. Used in in the com.amazonaws.services.s3.model.ListObjectsRequest.
policy null Shared *Camel 2.8.4*: The policy for this queue to set in the com.amazonaws.services.s3.AmazonS3#setBucketPolicy() method.
storageClass null Producer *Camel 2.8.4*: The storage class to set in the com.amazonaws.services.s3.model.PutObjectRequest request.
prefix null Consumer *Camel 2.10.1*: The prefix which is used in the com.amazonaws.services.s3.model.ListObjectsRequest to only consume objects we are interested in.
multiPartUpload false Producer Camel 2.15.0: If true, Camel uploads the file in multi-part format, where the part size can be specified by the partSize option.
partSize 25 * 1024 * 1024 Producer Camel 2.15.0: Specifies the partSize used in multi-part upload. Default is 25 MB.
Required S3 component options
You have to provide the amazonS3Client in the Registry or your accessKey and secretKey to access the Amazon's S3.

Batch Consumer

This component implements the Batch Consumer.
This allows you for instance to know how many messages exists in this batch and for instance let the Aggregator aggregate this number of messages.

Usage

Message headers evaluated by the S3 producer

Expand
Header Type Description
CamelAwsS3Key String The key under which this object will be stored.
CamelAwsS3ContentLength Long The content length of this object.
CamelAwsS3ContentType String The content type of this object.
CamelAwsS3ContentControl String The content control of this object.
CamelAwsS3ContentDisposition String The content disposition of this object.
CamelAwsS3ContentEncoding String The content encoding of this object.
CamelAwsS3ContentMD5 String The md5 checksum of this object.
CamelAwsS3LastModified java.util.Date The last modified timestamp of this object.
CamelAwsS3StorageClass String *Camel 2.8.4:* The storage class of this object.
CamelAwsS3CannedAcl String Camel 2.11.0: The canned acl that will be applied to the object. see com.amazonaws.services.s3.model.CannedAccessControlList for allowed values.
CamelAwsS3Acl com.amazonaws.services.s3.model.AccessControlList Camel 2.11.0: a well constructed Amazon S3 Access Control List object. see com.amazonaws.services.s3.model.AccessControlList for more details

Message headers set by the S3 producer

Expand
Header Type Description
CamelAwsS3ETag String The ETag value for the newly uploaded object.
CamelAwsS3VersionId String The optional version ID of the newly uploaded object.

Message headers set by the S3 consumer

Expand
Header Type Description
CamelAwsS3Key String The key under which this object is stored.
CamelAwsS3BucketName String The name of the bucket in which this object is contained.
CamelAwsS3ETag String The hex encoded 128-bit MD5 digest of the associated object according to RFC 1864. This data is used as an integrity check to verify that the data received by the caller is the same data that was sent by Amazon S3.
CamelAwsS3LastModified Date The value of the Last-Modified header, indicating the date and time at which Amazon S3 last recorded a modification to the associated object.
CamelAwsS3VersionId String The version ID of the associated Amazon S3 object if available. Version IDs are only assigned to objects when an object is uploaded to an Amazon S3 bucket that has object versioning enabled.
CamelAwsS3ContentType String The Content-Type HTTP header, which indicates the type of content stored in the associated object. The value of this header is a standard MIME type.
CamelAwsS3ContentMD5 String The base64 encoded 128-bit MD5 digest of the associated object (content - not including headers) according to RFC 1864. This data is used as a message integrity check to verify that the data received by Amazon S3 is the same data that the caller sent.
CamelAwsS3ContentLength Long The Content-Length HTTP header indicating the size of the associated object in bytes.
CamelAwsS3ContentEncoding String The optional Content-Encoding HTTP header specifying what content encodings have been applied to the object and what decoding mechanisms must be applied in order to obtain the media-type referenced by the Content-Type field.
CamelAwsS3ContentDisposition String The optional Content-Disposition HTTP header, which specifies presentational information such as the recommended filename for the object to be saved as.
CamelAwsS3ContentControl String The optional Cache-Control HTTP header which allows the user to specify caching behavior along the HTTP request/reply chain.

Advanced AmazonS3 configuration

If your Camel Application is running behind a firewall or if you need to have more control over the AmazonS3 instance configuration, you can create your own instance:
AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");

ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

AmazonS3 client = new AmazonS3Client(awsCredentials, clientConfiguration);

registry.bind("client", client);
Copy to Clipboard Toggle word wrap
and refer to it in your Camel aws-s3 component configuration:
from("aws-s3://MyBucket?amazonS3Client=#client&delay=5000&maxMessagesPerPoll=5")
.to("mock:result");
Copy to Clipboard Toggle word wrap

Dependencies

Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where $\{camel-version\} must be replaced by the actual version of Camel (2.8 or higher).

10.5. AWS-SDB

SDB Component

Available as of Camel 2.8.4
The sdb component supports storing and retrieving data from/to Amazon's SDB service.
Prerequisites
You must have a valid Amazon Web Services developer account, and be signed up to use Amazon SDB. More information are available at Amazon SDB.

URI Format

aws-sdb://domainName[?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options

Expand
Name Default Value Context Description
amazonSDBClient null Producer Reference to a com.amazonaws.services.simpledb.AmazonSimpleDB in the Registry.
accessKey null Producer Amazon AWS Access Key
secretKey null Producer Amazon AWS Secret Key
amazonSdbEndpoint null Producer The region with which the AWS-SDB client wants to work with.
domainName null Producer The name of the domain currently worked with.
maxNumberOfDomains 100 Producer The maximum number of domain names you want returned. The range is 1 * to 100.
consistentRead false Producer Determines whether or not strong consistency should be enforced when data is read.
operation PutAttributes Producer Valid values are BatchDeleteAttributes, BatchPutAttributes, DeleteAttributes, DeleteDomain, DomainMetadata, GetAttributes, ListDomains, PutAttributes, Select.
Required SDB component options
You have to provide the amazonSDBClient in the Registry or your accessKey and secretKey to access the Amazon's SDB.

Usage

Message headers evaluated by the SDB producer

Expand
Header Type Description
CamelAwsSdbAttributes Collection<Attribute> List of attributes to be acted upon.
CamelAwsSdbAttributeNames Collection<String> The names of the attributes to be retrieved.
CamelAwsSdbConsistentRead Boolean Determines whether or not strong consistency should be enforced when data is read.
CamelAwsSdbDeletableItems Collection<DeletableItem> A list of items on which to perform the delete operation in a batch.
CamelAwsSdbDomainName String The name of the domain currently worked with.
CamelAwsSdbItemName String The unique key for this item
CamelAwsSdbMaxNumberOfDomains Integer The maximum number of domain names you want returned. The range is 1 * to 100.
CamelAwsSdbNextToken String A string specifying where to start the next list of domain/item names.
CamelAwsSdbOperation String To override the operation from the URI options.
CamelAwsSdbReplaceableAttributes Collection<ReplaceableAttribute> List of attributes to put in an Item.
CamelAwsSdbReplaceableItems Collection<ReplaceableItem> A list of items to put in a Domain.
CamelAwsSdbSelectExpression String The expression used to query the domain.
CamelAwsSdbUpdateCondition UpdateCondition The update condition which, if specified, determines whether the specified attributes will be updated/deleted or not.

Message headers set during DomainMetadata operation

Expand
Header Type Description
CamelAwsSdbTimestamp Integer The data and time when metadata was calculated, in Epoch (UNIX) seconds.
CamelAwsSdbItemCount Integer The number of all items in the domain.
CamelAwsSdbAttributeNameCount Integer The number of unique attribute names in the domain.
CamelAwsSdbAttributeValueCount Integer The number of all attribute name/value pairs in the domain.
CamelAwsSdbAttributeNameSize Long The total size of all unique attribute names in the domain, in bytes.
CamelAwsSdbAttributeValueSize Long The total size of all attribute values in the domain, in bytes.
CamelAwsSdbItemNameSize Long The total size of all item names in the domain, in bytes.

Message headers set during GetAttributes operation

Expand
Header Type Description
CamelAwsSdbAttributes List<Attribute> The list of attributes returned by the operation.

Message headers set during ListDomains operation

Expand
Header Type Description
CamelAwsSdbDomainNames List<String> A list of domain names that match the expression.
CamelAwsSdbNextToken String An opaque token indicating that there are more domains than the specified MaxNumberOfDomains still available.

Message headers set during Select operation

Expand
Header Type Description
CamelAwsSdbItems List<Item> A list of items that match the select expression.
CamelAwsSdbNextToken String An opaque token indicating that more items than MaxNumberOfItems were matched, the response size exceeded 1 megabyte, or the execution time exceeded 5 seconds.

Advanced AmazonSimpleDB configuration

If you need more control over the AmazonSimpleDB instance configuration you can create your own instance and refer to it from the URI:
from("direct:start")
.to("aws-sdb://domainName?amazonSDBClient=#client");
Copy to Clipboard Toggle word wrap
The #client refers to a AmazonSimpleDB in the Registry.
For example if your Camel Application is running behind a firewall:
AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");
ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

AmazonSimpleDB client = new AmazonSimpleDBClient(awsCredentials, clientConfiguration);

registry.bind("client", client);
Copy to Clipboard Toggle word wrap

Dependencies

Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Camel (2.8.4 or higher).

10.6. AWS-SES

SES Component

Available as of Camel 2.8.4
The ses component supports sending emails with Amazon's SES service.
Prerequisites
You must have a valid Amazon Web Services developer account, and be signed up to use Amazon SES. More information are available at Amazon SES.

URI Format

aws-ses://from[?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options

Expand
Name Default Value Context Description
amazonSESClient null Producer Reference to a com.amazonaws.services.simpleemail.AmazonSimpleEmailService in the Registry.
accessKey null Producer Amazon AWS Access Key
secretKey null Producer Amazon AWS Secret Key
amazonSESEndpoint null Producer The region with which the AWS-SES client wants to work with.
subject null Producer The subject which is used if the message header 'CamelAwsSesSubject' is not present.
to null Producer List of destination email address. Can be overriden with 'CamelAwsSesTo' header.
returnPath null Producer The email address to which bounce notifications are to be forwarded, override it using 'CamelAwsSesReturnPath' header.
replyToAddresses null Producer List of reply-to email address(es) for the message, override it using 'CamelAwsSesReplyToAddresses' header.
Required SES component options
You have to provide the amazonSESClient in the Registry or your accessKey and secretKey to access the Amazon's SES.

Usage

Message headers evaluated by the SES producer

Expand
Header Type Description
CamelAwsSesFrom String The sender's email address.
CamelAwsSesTo List<String> The destination(s) for this email.
CamelAwsSesSubject String The subject of the message.
CamelAwsSesReplyToAddresses List<String> The reply-to email address(es) for the message.
CamelAwsSesReturnPath String The email address to which bounce notifications are to be forwarded.
CamelAwsSesHtmlEmail
Boolean
Since Camel 2.12.3 The flag to show if email content is HTML.

Message headers set by the SES producer

Expand
Header Type Description
CamelAwsSesMessageId String The Amazon SES message ID.

Advanced AmazonSimpleEmailService configuration

If you need more control over the AmazonSimpleEmailService instance configuration you can create your own instance and refer to it from the URI:
from("direct:start")
.to("aws-ses://example@example.com?amazonSESClient=#client");
Copy to Clipboard Toggle word wrap
The #client refers to a AmazonSimpleEmailService in the Registry.
For example if your Camel Application is running behind a firewall:
AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");
ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);
AmazonSimpleEmailService client = new AmazonSimpleEmailServiceClient(awsCredentials, clientConfiguration);

registry.bind("client", client);
Copy to Clipboard Toggle word wrap

Dependencies

Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Camel (2.8.4 or higher).

10.7. AWS-SNS

SNS Component

Available as of Camel 2.8
The SNS component allows messages to be sent to an Amazon Simple Notification Topic. The implementation of the Amazon API is provided by the AWS SDK.
Prerequisites
You must have a valid Amazon Web Services developer account, and be signed up to use Amazon SNS. More information are available at Amazon SNS.

URI Format

aws-sns://topicName[?options]
Copy to Clipboard Toggle word wrap
The topic will be created if they don't already exists. You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options

Expand
Name Default Value Context Description
amazonSNSClient null Producer Reference to a com.amazonaws.services.sns.AmazonSNS in the Registry.
accessKey null Producer Amazon AWS Access Key
secretKey null Producer Amazon AWS Secret Key
subject null Producer The subject which is used if the message header 'CamelAwsSnsSubject' is not present.
amazonSNSEndpoint null Producer The region with which the AWS-SNS client wants to work with.
policy null Producer Camel 2.8.4: The policy for this queue to set in the com.amazonaws.services.sns.model.SetTopicAttributesRequest.
Required SNS component options
You have to provide the amazonSNSClient in the Registry or your accessKey and secretKey to access the Amazon's SNS.

Usage

Message headers evaluated by the SNS producer

Expand
Header Type Description
CamelAwsSnsSubject String The Amazon SNS message subject. If not set, the subject from the SnsConfiguration is used.

Message headers set by the SNS producer

Expand
Header Type Description
CamelAwsSnsMessageId String The Amazon SNS message ID.

Advanced AmazonSNS configuration

If you need more control over the AmazonSNS instance configuration you can create your own instance and refer to it from the URI:
from("direct:start")
.to("aws-sns://MyTopic?amazonSNSClient=#client");
Copy to Clipboard Toggle word wrap
The #client refers to a AmazonSNS in the Registry.
For example if your Camel Application is running behind a firewall:
AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");
ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);
AmazonSNS client = new AmazonSNSClient(awsCredentials, clientConfiguration);

registry.bind("client", client);
Copy to Clipboard Toggle word wrap

Dependencies

Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>

Copy to Clipboard Toggle word wrap
where $\{camel-version\} must be replaced by the actual version of Camel (2.8 or higher).

10.8. AWS-SQS

SQS Component

Available as of Camel 2.6
The sqs component supports sending and receiving messages to Amazon's SQS service.
Prerequisites
You must have a valid Amazon Web Services developer account, and be signed up to use Amazon SQS. More information are available at Amazon SQS.

URI Format

aws-sqs://queue-name[?options]
Copy to Clipboard Toggle word wrap
The queue will be created if they don't already exists. You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options

Expand
Name Default Value Context Description
amazonSQSClient null Shared Reference to a com.amazonaws.services.sqs.AmazonSQS in the Registry.
accessKey null Shared Amazon AWS Access Key
secretKey null Shared Amazon AWS Secret Key
amazonSQSEndpoint null Shared The region with which the AWS-SQS client wants to work with. Only works if Camel creates the AWS-SQS client, i.e., if you explicitly set amazonSQSClient, then this setting will have no effect. You would have to set it on the client you create directly.
attributeNames null Consumer A list of attributes to set in the com.amazonaws.services.sqs.model.ReceiveMessageRequest.
concurrentConsumers 1 Consumer Camel 2.15.0 Allows you to use multiple threads to poll the SQS queue to increase throughput.
defaultVisibilityTimeout null Shared The visibility timeout (in seconds) to set in the com.amazonaws.services.sqs.model.CreateQueueRequest.
deleteAfterRead true Consumer Delete message from SQS after it has been read
deleteIfFiltered true Consumer Camel 2.12.2,2.13.0 Whether or not to send the DeleteMessage to the SQS queue if an exchange fails to get through a filter. If 'false' and exchange does not make it through a Camel filter upstream in the route, then don't send DeleteMessage.
maxMessagesPerPoll null Consumer The maximum number of messages which can be received in one poll to set in the com.amazonaws.services.sqs.model.ReceiveMessageRequest.
visibilityTimeout null Shared The duration (in seconds) that the received messages are hidden from subsequent retrieve requests after being retrieved by a ReceiveMessage request to set in the com.amazonaws.services.sqs.model.SetQueueAttributesRequest. This only make sense if its different from defaultVisibilityTimeout. It changes the queue visibility timeout attribute permanently.
messageVisibilityTimeout null Consumer Camel 2.8: The duration (in seconds) that the received messages are hidden from subsequent retrieve requests after being retrieved by a ReceiveMessage request to set in the com.amazonaws.services.sqs.model.ReceiveMessageRequest. It does NOT change the queue visibility timeout attribute permanently.
extendMessageVisibility false Consumer Camel 2.10: If enabled then a scheduled background task will keep extending the message visibility on SQS. This is needed if it taks a long time to process the message. If set to true defaultVisibilityTimeout must be set. See details at Amazon docs.
maximumMessageSize null Shared Camel 2.8: The maximumMessageSize (in bytes) an SQS message can contain for this queue, to set in the com.amazonaws.services.sqs.model.SetQueueAttributesRequest.
messageRetentionPeriod null Shared Camel 2.8: The messageRetentionPeriod (in seconds) a message will be retained by SQS for this queue, to set in the com.amazonaws.services.sqs.model.SetQueueAttributesRequest.
policy null Shared Camel 2.8: The policy for this queue to set in the com.amazonaws.services.sqs.model.SetQueueAttributesRequest.
delaySeconds null Producer Camel 2.9.3: Delay sending messages for a number of seconds.
waitTimeSeconds 0 Producer Camel 2.11: Duration in seconds (0 to 20) that the ReceiveMessage action call will wait until a message is in the queue to include in the response.
receiveMessageWaitTimeSeconds 0 Shared Camel 2.11: If you do not specify WaitTimeSeconds in the request, the queue attribute ReceiveMessageWaitTimeSeconds is used to determine how long to wait.
queueOwnerAWSAccountId null Shared Camel 2.12: Specify the queue owner aws account id when you need to connect the queue with different account owner.
region
null
Shared
Camel 2.12.3: Specify the queue region which could be used with queueOwnerAWSAccountId to build the service URL.
redrivePolicy
null
Shared
Camel 2.15.0: Specify the policy that sends a message to DeadLetter queue. See detail at Amazon docs.
Required SQS component options
You have to provide the amazonSQSClient in the Registry or your accessKey and secretKey to access the Amazon's SQS.

Batch Consumer

This component implements the Batch Consumer.
This allows you for instance to know how many messages exists in this batch and for instance let the Aggregator aggregate this number of messages.

Usage

Message headers set by the SQS producer

Expand
Header Type Description
CamelAwsSqsMD5OfBody String The MD5 checksum of the Amazon SQS message.
CamelAwsSqsMessageId String The Amazon SQS message ID.
CamelAwsSqsDelaySeconds Integer Since Camel 2.11, the delay seconds that the Amazon SQS message can be see by others.

Message headers set by the SQS consumer

Expand
Header Type Description
CamelAwsSqsMD5OfBody String The MD5 checksum of the Amazon SQS message.
CamelAwsSqsMessageId String The Amazon SQS message ID.
CamelAwsSqsReceiptHandle String The Amazon SQS message receipt handle.
CamelAwsSqsAttributes Map<String, String> The Amazon SQS message attributes.

Advanced AmazonSQS configuration

If your Camel Application is running behind a firewall or if you need to have more control over the AmazonSQS instance configuration, you can create your own instance:
AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");

ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

AmazonSQS client = new AmazonSQSClient(awsCredentials, clientConfiguration);

registry.bind("client", client);
Copy to Clipboard Toggle word wrap
and refer to it in your Camel aws-sqs component configuration:
from("aws-sqs://MyQueue?amazonSQSClient=#client&delay=5000&maxMessagesPerPoll=5")
.to("mock:result");

Copy to Clipboard Toggle word wrap

Dependencies

Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where $\{camel-version\} must be replaced by the actual version of Camel (2.6 or higher).

JMS-style Selectors

SQS does not allow selectors, but you can effectively achieve this by using the Camel Filter EIP and setting an appropriate visibilityTimeout. When SQS dispatches a message, it will wait up to the visibility timeout before it will try to dispatch the message to a different consumer unless a DeleteMessage is received. By default, Camel will always send the DeleteMessage at the end of the route, unless the route ended in failure. To achieve appropriate filtering and not send the DeleteMessage even on successful completion of the route, use a Filter:
from("aws-sqs://MyQueue?amazonSQSClient=#client&defaultVisibilityTimeout=5000&deleteIfFiltered=false")
.filter("${header.login} == true")
.to("mock:result");
Copy to Clipboard Toggle word wrap
In the above code, if an exchange doesn't have an appropriate header, it will not make it through the filter AND also not be deleted from the SQS queue. After 5000 miliseconds, the message will become visible to other consumers.

10.9. AWS-SWF

SWF Component

Available as of Camel 2.13
The Simple Workflow component supports managing workflows from Amazon's Simple Workflow service.
Note
You must have a valid Amazon Web Services developer account, and be signed up to use Amazon Simple Workflow. More information are available at Amazon Simple Workflow.

URI Format

aws-swf://<workflow|activity>[?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options

Expand
Name
Default Value
Context
Description
amazonSWClient
null
All
A reference to a com.amazonaws.services.simpleworkflow.AmazonSimpleWorkflowClient in the Registry.
accessKey
null
All
Amazon AWS Access Key.
secretKey
null
All
Amazon AWS Secret Key.
sWClient.XXX
null
All
Properties to set on AmazonSimpleWorkflowClient in use.
clientConfiguration.XXX
null
All
Properties to set on ClientConfiguration in use.
startWorkflowOptions.XXX
null
Workflow/Producer
Properties to set on useStartWorkflowOptions in use.
operation
START
Workflow/Producer
The operation to perform on the workflow. Supported operations are: SIGNAL, CANCEL, TERMINATE, GET_STATE, START, DESCRIBE, GET_HISTORY.
domainName
null
All
The workflow domain to use.
activityList
null
Activity/Consumer
The list name to consume activities from.
workflowList null
Workflow/Consumer
The list name to consume workflows from.
eventName null All The workflow or activity event name to use.
version null All The workflow or activity event version to use.
signalName null Workflow/Producer The name of the signal to send to the workflow.
childPolicy null Workflow/Producer The policy to use on child workflows when terminating a workflow.
terminationReason null Workflow/Producer The reason for terminating a workflow.
stateResultType Object Workflow/Producer The type of the result when a workflow state is queried.
terminationDetails null Workflow/Producer Details for terminating a workflow.
dataConverter JsonDataConverter All An instance of com.amazonaws.services.simpleworkflow.flow.DataConverter to use for serializing/deserializing the data.
activitySchedulingOptions null Activity/Producer An instance of ActivitySchedulingOptions used to specify different timeout options.
activityTypeExecutionOptions null Activity/Consumer An instance of ActivityTypeExecutionOptions.
activityTypeRegistrationOptions null Activity/Consumer An instance of ActivityTypeRegistrationOptions.
workflowTypeRegistrationOptions null Workflow/Consumer An instance of WorkflowTypeRegistrationOptions.
Note
You have to provide the amazonSWClient in the Registry or your accessKey and secretKey to access the Amazon's Simple Workflow Service.

Usage

A workflow producer allows interacting with a workflow. It can start a new workflow execution, query its state, send signals to a running workflow, or terminate and cancel it.
Expand
Header
Type
Description
CamelSWFOperation
String
The operation to perform on the workflow. Supported operations are: SIGNAL, CANCEL, TERMINATE, GET_STATE, START, DESCRIBE, GET_HISTORY.
CamelSWFWorkflowId
String
A workflow ID to use.
CamelAwsDdbKeyCamelSWFRunId
String
A worfklow run ID to use.
CamelSWFStateResultType
String
The type of the result when a workflow state is queried.
CamelSWFEventName
String
The workflow or activity event name to use.
CamelSWFVersion
String
The workflow or activity event version to use.
CamelSWFReason
String
The reason for terminating a workflow.
CamelSWFDetails
String
Details for terminating a workflow.
CamelSWFChildPolicy
String
The policy to use on child workflows when terminating a workflow.

Message headers set by the SWF Workflow Producer

Expand
Header
Type
Description
CamelSWFWorkflowId
String
The worfklow ID used or newly generated.
CamelAwsDdbKeyCamelSWFRunId
String
The worfklow run ID used or generated.

Message headers set by the SWF Workflow Consumer

A workflow consumer represents the workflow logic. When it is started, it will start polling workflow decision tasks and process them. In addition to processing decision tasks, a workflow consumer route, will also receive signals (send from a workflow producer) or state queries. The primary purpose of a workflow consumer is to schedule activity tasks for execution using activity producers. Actually activity tasks can be scheduled only from a thread started by a workflow consumer.
Expand
Header
Type
Description
CamelSWFAction
String
Indicates what type is the current event: CamelSWFActionExecute, CamelSWFSignalReceivedAction or CamelSWFGetStateAction.
CamelSWFWorkflowReplaying
boolean
Indicates whether the current decision task is a replay or not.
CamelSWFWorkflowStartTime
long
The time of the start event for this decision task.

Message headers set by the SWF Activity Producer

An activity producer allows scheduling activity tasks. An activity producer can be used only from a thread started by a workflow consumer ie, it can process synchronous exchanges started by a workflow consumer.
Expand
Header
Type
Description
CamelSWFEventName
String
The activity name to schedule.
CamelSWFVersion
String
The activity version to schedule.

Message headers set by the SWF Activity Consumer

Expand
Header
Type
Description
CamelSWFTaskToken
String
The task token that is required to report task completion for manually completed tasks.

Advanced amazonSWClient configuration

If you need more control over the AmazonSimpleWorkflowClient instance configuration you can create your own instance and refer to it from the URI:
The #client refers to a AmazonSimpleWorkflowClient in the Registry.
For example if your Camel Application is running behind a firewall:
AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");
ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

AmazonSimpleWorkflowClient client = new AmazonSimpleWorkflowClient(awsCredentials, clientConfiguration);

registry.bind("client", client);
Copy to Clipboard Toggle word wrap

Dependencies

Maven users will need to add the following dependency to their pom.xml.
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Camel (2.13 or higher).

Chapter 11. Bean

Bean Component

The bean: component binds beans to Apache Camel message exchanges.

URI format

bean:beanID[?options]
Copy to Clipboard Toggle word wrap
Where beanID can be any string which is used to lookup look up the bean in the Registry

Options

Expand
Name Type Default Description
method String null The method name from the bean that will be invoked. If not provided, Camel will try to determine the method itself. In case of ambiguity an exception will be thrown. See Bean Binding for more details.
cache boolean false If enabled, Apache Camel will cache the result of the first Registry look-up. Cache can be enabled if the bean in the Registry is defined as a singleton scope.
You can append query options to the URI in the following format, ?option=value&option=value&...

Using

The object instance that is used to consume messages must be explicitly registered with the Registry. For example, if you are using Spring you must define the bean in the Spring configuration, spring.xml; or if you don't use Spring, put the bean in JNDI.
// lets populate the context with the services we need
// note that we could just use a spring.xml file to avoid this step
JndiContext context = new JndiContext();
context.bind("bye", new SayService("Good Bye!"));

CamelContext camelContext = new DefaultCamelContext(context);
Copy to Clipboard Toggle word wrap
Once an endpoint has been registered, you can build routes that use it to process exchanges.
// lets add simple route
camelContext.addRoutes(new RouteBuilder() {
    public void configure() {
        from("direct:hello").to("bean:bye");
    }
});
Copy to Clipboard Toggle word wrap
A bean: endpoint cannot be defined as the input to the route; i.e. you cannot consume from it, you can only route from some inbound message Endpoint to the bean endpoint as output. So consider using a direct: or queue: endpoint as the input.
You can use the createProxy() methods on ProxyHelper to create a proxy that will generate BeanExchanges and send them to any endpoint:
Endpoint endpoint = camelContext.getEndpoint("direct:hello");
ISay proxy = ProxyHelper.createProxy(endpoint, ISay.class);
String rc = proxy.say();
assertEquals("Good Bye!", rc);
Copy to Clipboard Toggle word wrap
And the same route using Spring DSL:
    <route>
       <from uri="direct:hello">
       <to uri="bean:bye"/>
    </route>
Copy to Clipboard Toggle word wrap

Bean as endpoint

Apache Camel also supports invoking Bean as an Endpoint. In the route below:
<camelContext xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="direct:start"/>
    <to uri="myBean"/>
    <to uri="mock:results"/>
  </route>
</camelContext>

<bean id="myBean" class="org.apache.camel.spring.bind.ExampleBean"/>
Copy to Clipboard Toggle word wrap
What happens is that when the exchange is routed to the myBean, Apache Camel will use the Bean Binding to invoke the bean. The source for the bean is just a plain POJO:
public class ExampleBean {

    public String sayHello(String name) {
        return "Hello " + name + "!";
    }
}
Copy to Clipboard Toggle word wrap
Apache Camel will use Bean Binding to invoke the sayHello method, by converting the Exchange's In body to the String type and storing the output of the method on the Exchange Out body.

Java DSL bean syntax

Java DSL comes with syntactic sugar for the Bean component. Instead of specifying the bean explicitly as the endpoint (i.e. to("bean:beanName")) you can use the following syntax:
// Send message to the bean endpoint
// and invoke method resolved using Bean Binding.
from("direct:start").beanRef("beanName");

// Send message to the bean endpoint
// and invoke given method.
from("direct:start").beanRef("beanName", "methodName");
Copy to Clipboard Toggle word wrap
Instead of passing name of the reference to the bean (so that Camel will lookup for it in the registry), you can specify the bean itself:
// Send message to the given bean instance.
from("direct:start").bean(new ExampleBean());

// Explicit selection of bean method to be invoked.
from("direct:start").bean(new ExampleBean(), "methodName");

// Camel will create the instance of bean and cache it for you.
from("direct:start").bean(ExampleBean.class);
Copy to Clipboard Toggle word wrap

Bean Binding

How bean methods to be invoked are chosen (if they are not specified explicitly through the method parameter) and how parameter values are constructed from the Message are all defined by the Bean Binding mechanism which is used throughout all of the various Bean Integration mechanisms in Apache Camel.

Chapter 12. Bean Validator

Bean Validator Component

Available as of Apache Camel 2.3
The Validator component performs bean validation of the message body using the Java Bean Validation API (JSR 303). Camel uses the reference implementation, which is Hibernate Validator.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-bean-validator</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

bean-validator:label[?options]
Copy to Clipboard Toggle word wrap
or
bean-validator://label[?options]
Copy to Clipboard Toggle word wrap
Where label is an arbitrary text value describing the endpoint. You can append query options to the URI in the following format, ?option=value&option=value&...

URI Options

The following URI options are supported:
Expand
Option Default Description
group javax.validation.groups.Default The custom validation group to use.
messageInterpolator org.hibernate.validator.engine. ResourceBundleMessageInterpolator Reference to a custom javax.validation.MessageInterpolator in the Registry.
traversableResolver org.hibernate.validator.engine.resolver. DefaultTraversableResolver Reference to a custom javax.validation.TraversableResolver in the Registry.
constraintValidatorFactory org.hibernate.validator.engine. ConstraintValidatorFactoryImpl Reference to a custom javax.validation.ConstraintValidatorFactory in the Registry.

OSGi deployment

To use Hibernate Validator in the OSGi environment use dedicated ValidationProviderResolver implementation, just as org.apache.camel.component.bean.validator.HibernateValidationProviderResolver. The snippet below demonstrates this approach. Keep in mind that you can use HibernateValidationProviderResolver starting from the Camel 2.13.0.

Example 12.1. Using HibernateValidationProviderResolver

from("direct:test")
  .to("bean-validator://ValidationProviderResolverTest?validationProviderResolver=#myValidationProviderResolver");

...

<bean id="myValidationProviderResolver" class="org.apache.camel.component.bean.validator.HibernateValidationProviderResolver"/>
Copy to Clipboard Toggle word wrap
If no custom ValidationProviderResolver is defined and the validator component has been deployed into the OSGi environment, the HibernateValidationProviderResolver will be automatically used.

Example

Assumed we have a Java bean with the following annotations
Car.java
// Java
public class Car {

    @NotNull
    private String manufacturer;

    @NotNull
    @Size(min = 5, max = 14, groups = OptionalChecks.class)
    private String licensePlate;
    
    // getter and setter
}
Copy to Clipboard Toggle word wrap
and an interface definition for our custom validation group
OptionalChecks.java
public interface OptionalChecks {
}
Copy to Clipboard Toggle word wrap
with the following Apache Camel route, only the @NotNull constraints on the attributes manufacturer and licensePlate will be validated (Apache Camel uses the default group javax.validation.groups.Default).
from("direct:start")
.to("bean-validator://x")
.to("mock:end")
Copy to Clipboard Toggle word wrap
If you want to check the constraints from the group OptionalChecks, you have to define the route like this
from("direct:start")
.to("bean-validator://x?group=OptionalChecks")
.to("mock:end")
Copy to Clipboard Toggle word wrap
If you want to check the constraints from both groups, you have to define a new interface first
AllChecks.java
@GroupSequence({Default.class, OptionalChecks.class})
public interface AllChecks {
}
Copy to Clipboard Toggle word wrap
and then your route definition should looks like this
from("direct:start")
.to("bean-validator://x?group=AllChecks")
.to("mock:end")
Copy to Clipboard Toggle word wrap
And if you have to provide your own message interpolator, traversable resolver and constraint validator factory, you have to write a route like this
<bean id="myMessageInterpolator" class="my.ConstraintValidatorFactory" />
<bean id="myTraversableResolver" class="my.TraversableResolver" />
<bean id="myConstraintValidatorFactory" class="my.ConstraintValidatorFactory" />

from("direct:start")
.to("bean-validator://x?group=AllChecks&messageInterpolator=#myMessageInterpolator&traversableResolver=#myTraversableResolver&constraintValidatorFactory=#myConstraintValidatorFactory")
.to("mock:end")
Copy to Clipboard Toggle word wrap
It's also possible to describe your constraints as XML and not as Java annotations. In this case, you have to provide the file META-INF/validation.xml which could looks like this
validation.xml
<?xml version="1.0" encoding="UTF-8"?>
<validation-config
	xmlns="http://jboss.org/xml/ns/javax/validation/configuration"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://jboss.org/xml/ns/javax/validation/configuration">
	<default-provider>org.hibernate.validator.HibernateValidator</default-provider>
	<message-interpolator>org.hibernate.validator.engine.ResourceBundleMessageInterpolator</message-interpolator>
	<traversable-resolver>org.hibernate.validator.engine.resolver.DefaultTraversableResolver</traversable-resolver>
	<constraint-validator-factory>org.hibernate.validator.engine.ConstraintValidatorFactoryImpl</constraint-validator-factory>
	
	<constraint-mapping>/constraints-car.xml</constraint-mapping>
</validation-config>
Copy to Clipboard Toggle word wrap
and the constraints-car.xml file
constraints-car.xml
<?xml version="1.0" encoding="UTF-8"?>
<constraint-mappings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://jboss.org/xml/ns/javax/validation/mapping validation-mapping-1.0.xsd"
	xmlns="http://jboss.org/xml/ns/javax/validation/mapping">
	<default-package>org.apache.camel.component.bean.validator</default-package>
	
	<bean class="CarWithoutAnnotations" ignore-annotations="true">
		<field name="manufacturer">
			<constraint annotation="javax.validation.constraints.NotNull" />
		</field>
		
		<field name="licensePlate">
			<constraint annotation="javax.validation.constraints.NotNull" />
			
			<constraint annotation="javax.validation.constraints.Size">
				<groups>
					<value>org.apache.camel.component.bean.validator.OptionalChecks</value>
				</groups>
				<element name="min">5</element>
				<element name="max">14</element>
			</constraint>
		</field>
	</bean>
</constraint-mappings>
Copy to Clipboard Toggle word wrap

Chapter 13. Beanstalk

Beanstalk component

Available in Camel 2.15
camel-beanstalk project provides a Camel component for job retrieval and post-processing of Beanstalk jobs.
You can find the detailed explanation of Beanstalk job life cycle at Beanstalk protocol.

Dependencies

Maven users need to add the following dependency to their pom.xml
<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-beanstalk</artifactId>
  <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Camel (2.15.0 or higher).

URI format

beanstalk://[host[:port]][/tube][?options]
Copy to Clipboard Toggle word wrap
You may omit either port or both host and port: for the Beanstalk defaults to be used (“localhost” and 11300). If you omit tube, Beanstalk component will use the tube with name “default”.
When listening, you may probably want to watch for jobs from several tubes. Just separate them with plus sign, e.g.
beanstalk://localhost:11300/tube1+tube2
Copy to Clipboard Toggle word wrap
Tube name will be URL decoded, so if your tube names include special characters like + or ?, you need to URL-encode them appropriately, or use the RAW syntax, see more details here.
By the way, you cannot specify several tubes when you are writing jobs into Beanstalk.

Common URI options

Expand
Name
Default value
Description
jobPriority 1000 Job priority. (0 is the highest, see Beanstalk protocol)
jobDelay 0 Job delay in seconds.
jobTimeToRun 60 Job time to run in seconds. (when 0, the beanstalkd daemon raises it to 1 automatically, see Beanstalk protocol)

Producer UIR options

Producer behaviour is affected by the command parameter which tells what to do with the job, it can be
Expand
Name
Default value
Description
command put
  • put means to put the job into Beanstalk. Job body is specified in the Camel message body. Job ID will be returned in beanstalk.jobId message header.
  • delete, release, touch or bury expect Job ID in the message header beanstalk.jobId. Result of the operation is returned in beanstalk.result message header
  • kick expects the number of jobs to kick in the message body and returns the number of jobs actually kicked out in the message header beanstalk.result.

Consumer UIR options

The consumer may delete the job immediately after reserving it or wait until Camel routes process it. While the first scenario is more like a “message queue”, the second is similar to “job queue”. This behavior is controlled by consumer.awaitJob parameter, which equals true by default (following Beanstalkd nature).
When synchronous, the consumer calls delete on successful job completion and calls bury on failure. You can choose which command to execute in the case of failure by specifying consumer.onFailure parameter in the URI. It can take values of bury, delete or release.
There is a boolean parameter consumer.useBlockIO which corresponds to the same parameter in JavaBeanstalkClient library. By default it is true.
Be careful when specifying release, as the failed job will immediately become available in the same tube and your consumer will try to acquire it again. You can release and specify jobDelay though.
Expand
Name
Default value
Description
onFailure bury Command to use when processing failed. You can choose among: bury, delete or release.
useBlockIO true Whether to use blockIO.
awaitJob true Whether to wait for job to complete before ack the job from beanstalk
The beanstalk consumer is a Scheduled Polling Consumer which means there is more options you can configure, such as how frequent the consumer should poll. For more details see Polling Consumer.

Consumer Headers

The consumer stores a number of job headers in the Exchange message:
Expand
Property
Type
Description
beanstalk.jobId long Job ID
beanstalk.tube string the name of the tube that contains this job
beanstalk.state string “ready” or “delayed” or “reserved” or “buried” (must be “reserved”)
beanstalk.priority long the priority value set
beanstalk.age int the time in seconds since the put command that created this job
beanstalk.time-left int the number of seconds left until the server puts this job into the ready queue
beanstalk.timeouts int the number of times this job has timed out during a reservation
beanstalk.releases int the number of times a client has released this job from a reservation
beanstalk.buries int the number of times this job has been buried
beanstalk.kicks int the number of times this job has been kicked

Examples

This Camel component lets you both request the jobs for processing and supply them to Beanstalkd daemon. Our simple demo routes may look like
from("beanstalk:testTube").
   log("Processing job #${property.beanstalk.jobId} with body ${in.body}").
   process(new Processor() {
     @Override
     public void process(Exchange exchange) {
       // try to make integer value out of body
       exchange.getIn().setBody( Integer.valueOf(exchange.getIn().getBody(classOf[String])) );
     }
   }).
   log("Parsed job #${property.beanstalk.jobId} to body ${in.body}");
Copy to Clipboard Toggle word wrap
from("timer:dig?period=30seconds").
   setBody(constant(10)).log("Kick ${in.body} buried/delayed tasks").
   to("beanstalk:testTube?command=kick");
Copy to Clipboard Toggle word wrap
In the first route we are listening for new jobs in tube “testTube”. When they are arriving, we are trying to parse integer value from the message body. If done successful, we log it and this successful exchange completion makes Camel component to delete this job from Beanstalk automatically. Contrary, when we cannot parse the job data, the exchange failed and the Camel component buries it by default, so that it can be processed later or probably we are going to inspect failed jobs manually.
So the second route periodically requests Beanstalk to kick 10 jobs out of buried and/or delayed state to the normal queue.

Chapter 14. Box

Box Component

Available as of Camel 2.14
The Box component provides access to all of the Box.com APIs accessible using box-java-sdk-v2. It allows producing messages to upload and download files, create, edit, and manage folders, etc. It also supports APIs that allow polling for updates to user accounts and even changes to enterprise accounts, etc.
Box.com requires the use of OAuth2.0 for all client application authentication. In order to use camel-box with your account, you'll need to create a new application within Box.com at https://app.box.com/developers/services/edit/. The Box application's client id and secret will allow access to Box APIs which require a current user. A user access token is generated and managed by the API for an end user. Alternatively the Camel application can register an implementation of com.box.boxjavalibv2.authorization.IAuthSecureStorage to provide an com.box.boxjavalibv2.dao.IAuthData OAuth token.
Maven users will need to add the following dependency to their pom.xml for this component:
	<dependency>
    	<groupId>org.apache.camel</groupId>
    	<artifactId>camel-box</artifactId>
    	<version>${camel-version}</version>
	</dependency>
Copy to Clipboard Toggle word wrap

URI format

    box://endpoint-prefix/endpoint?[options]
Copy to Clipboard Toggle word wrap
Endpoint prefix can be one of:
  • collaborations
  • comments
  • events
  • files
  • folders
  • groups
  • poll-events
  • search
  • shared-comments
  • shared-files
  • shared-folders
  • shared-items
  • users

Box Component

The Box Component can be configured with the options below. These options can be provided using the component's bean property configuration of type org.apache.camel.component.box.BoxConfiguration. These options can also be specified in the endpoint URI.
Expand
Option
Type
Description
authSecureStorage
com.box.boxjavalibv2.authorization.IAuthSecureStorage
OAuth Secure Storage callback, can be used to provide and or save OAuth tokens. The callback may return null on first call to allow the component to login and authorize application and obtain an OAuth token, which can then be saved in the secure storage. For the component to be able to create a token automatically a user password must be provided.
boxConfig
com.box.boxjavalibv2.IBoxConfig
Custom Box SDK configuration, not required normally
clientId
String
Box application client ID
clientSecret
String
Box application client secret
connectionManagerBuilder
com.box.boxjavalibv2.BoxConnectionManagerBuilder
Custom Box connection manager builder, used to override default settings like max connections for underlying HttpClient.
httpParams
java.util.Map
Custom HTTP params for settings like proxy host
loginTimeout
int
amount of time the component will wait for a response from Box.com, default is 30 seconds
refreshListener
com.box.boxjavalibv2.authorization.OAuthRefreshListener
OAuth listener for token updates, if the Camel application needs to use the access token outside the route
revokeOnShutdown
boolean
Flag to revoke OAuth refresh token on route shutdown, default false. Will require a fresh refresh token on restart using either a custom IAuthSecureStorage or automatic component login by providing a user password
sharedLink
String
Box shared link for shared-* endpoints, can be a link for a shared comment, file or folder
sharedPassword
String
Password associated with the shared link, MUST be provided with sharedLink
userName
String
Box user name, MUST be provided
userPassword
String
Box user password, MUST be provided if authSecureStorage is not set, or returns null on first call

Producer Endpoints:

Producer endpoints can use endpoint prefixes followed by endpoint names and associated options described next. A shorthand alias can be used for some endpoints. The endpoint URI MUST contain a prefix.
Endpoint options that are not mandatory are denoted by []. When there are no mandatory options for an endpoint, one of the set of [] options MUST be provided. Producer endpoints can also use a special option inBody that in turn should contain the name of the endpoint option whose value will be contained in the Camel Exchange In message.
Any of the endpoint options can be provided in either the endpoint URI, or dynamically in a message header. The message header name must be of the format CamelBox.<option>. Note that the inBody option overrides message header, i.e. the endpoint option inBody=option would override a CamelBox.option header.
If a value is not provided for the option defaultRequest either in the endpoint URI or in a message header, it will be assumed to be null. Note that the null value will only be used if other options do not satisfy matching endpoints.
In case of Box API errors the endpoint will throw a RuntimeCamelException with a com.box.restclientv2.exceptions.BoxSDKException derived exception cause.

Endpoint Prefix collaborations

For more information on Box collaborations see https://developers.box.com/docs/#collaborations. The following endpoints can be invoked with the prefix collaborations as follows:
    box://collaborations/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint
Shorthand Alias
Options
Result Body Type
createCollaboration
create
collabRequest, folderId
com.box.boxjavalibv2.dao.BoxCollaboration
deleteCollaboration
delete
collabId, defaultRequest
getAllCollaborations
allCollaborations
getAllCollabsRequest
java.util.List
getCollaboration
collaboration
collabId, defaultRequest
com.box.boxjavalibv2.dao.BoxCollaboration
updateCollaboration
update
collabId, collabRequest
com.box.boxjavalibv2.dao.BoxCollaboration

URI Options for collaborations

Expand
Name
Type
collabId
String
collabRequest
com.box.boxjavalibv2.requests.requestobjects.BoxCollabRequestObject
defaultRequest
com.box.restclientv2.requestsbase.BoxDefaultRequestObject
folderId
String
getAllCollabsRequest
com.box.boxjavalibv2.requests.requestobjects.BoxGetAllCollabsRequestObject

Endpoint Prefix events

For more information on Box events see https://developers.box.com/docs/#events. Although this endpoint can be used by producers, Box events are better used as a consumer endpoint using the poll-events endpoint prefix. The following endpoints can be invoked with the prefix events as follows:
  box://events/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint
Shorthand Alias
Options
Result Body Type
getEventOptions
eventOptions
defaultRequest
com.box.boxjavalibv2.dao.BoxCollection
getEvents
events
eventRequest
com.box.boxjavalibv2.dao.BoxEventCollection

URI Options for events

Expand
Name
Type
defaultRequest
com.box.restclientv2.requestsbase.BoxDefaultRequestObject
eventRequest
com.box.boxjavalibv2.requests.requestobjects.BoxEventRequestObject

Endpoint Prefix groups

For more information on Box groups see https://developers.box.com/docs/#groups. The following endpoints can be invoked with the prefix groups as follows:
    box://groups/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint
Shorthand Alias
Options
Result Body Type
createGroup
[groupRequest], [name]
com.box.boxjavalibv2.dao.BoxGroup
createMembership
[groupId, role, userId], [groupMembershipRequest]
com.box.boxjavalibv2.dao.BoxGroupMembership
deleteGroup
delete
defaultRequest, groupId
deleteMembership
delete
defaultRequest, membershipId
getAllCollaborations
allCollaborations
defaultRequest, groupId
com.box.boxjavalibv2.dao.BoxCollection
getAllGroups
allGroups
defaultRequest
com.box.boxjavalibv2.dao.BoxCollection
getMembership
membership
defaultRequest, membershipId
com.box.boxjavalibv2.dao.BoxGroupMembership
getMemberships
memberships
defaultRequest, groupId
com.box.boxjavalibv2.dao.BoxCollection
updateGroup
update
groupId, groupRequest
com.box.boxjavalibv2.dao.BoxGroup
updateMembership
update
[groupMembershipRequest], [role], membershipId
com.box.boxjavalibv2.dao.BoxGroupMembership

URI Options for groups

Expand
Name
Type
defaultRequest
com.box.restclientv2.requestsbase.BoxDefaultRequestObject
groupId
String
groupMembershipRequest
com.box.boxjavalibv2.requests.requestobjects.BoxGroupMembershipRequestObject
groupRequest
com.box.boxjavalibv2.requests.requestobjects.BoxGroupRequestObject
membershipId
String
name
String
role
String
userId
String

Endpoint Prefix search

For more information on Box search API see https://developers.box.com/docs/#search. The following endpoints can be invoked with the prefix search as follows:
    box://search/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint
Shorthand Alias
Options
Result Body Type
search
defaultRequest, searchQuery
com.box.boxjavalibv2.dao.BoxCollection

URI Options for search

Expand
Name
Type
defaultRequest
com.box.restclientv2.requestsbase.BoxDefaultRequestObject
searchQuery
String

Endpoint Prefix comments and shared-comments

For more information on Box comments see https://developers.box.com/docs/#comments. The following endpoints can be invoked with the prefix comments or shared-comments as follows. The shared-comments prefix requires sharedLink and sharedPassword properties.
    box://comments/endpoint?[options]
    box://shared-comments/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint
Shorthand Alias
Options
Result Body Type
addComment
[commentRequest], [commentedItemId, commentedItemType, message]
com.box.boxjavalibv2.dao.BoxComment
deleteComment
delete
commentId, defaultRequest
getComment
comment
commentId, defaultRequest
com.box.boxjavalibv2.dao.BoxComment
updateComment
update
commentId, commentRequest
com.box.boxjavalibv2.dao.BoxComment

URI Options for comments and shared-comments

Expand
Name
Type
commentId
String
commentRequest
com.box.boxjavalibv2.requests.requestobjects.BoxCommentRequestObject
commentedItemId
String
commentedItemType
com.box.boxjavalibv2.dao.IBoxType
defaultRequest
com.box.restclientv2.requestsbase.BoxDefaultRequestObject
message
String

Endpoint Prefix files and shared-files

For more information on Box files see https://developers.box.com/docs/#files. The following endpoints can be invoked with the prefix files or shared-files as follows. The shared-files prefix requires sharedLink and sharedPassword properties.
   box://files/endpoint?[options]
   box://shared-files/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint
Shorthand Alias
Options
Result Body Type
copyFile
fileId, itemCopyRequest
com.box.boxjavalibv2.dao.BoxFile
createSharedLink
create
fileId, sharedLinkRequest
com.box.boxjavalibv2.dao.BoxFile
deleteFile
defaultRequest, fileId
downloadFile
download
[destination, listener], [listener, outputStreams], defaultRequest, fileId
java.io.InputStream
downloadThumbnail
download
extension, fileId, imageRequest
java.io.InputStream
getFile
file
defaultRequest, fileId
com.box.boxjavalibv2.dao.BoxFile
getFileComments
fileComments
defaultRequest, fileId
com.box.boxjavalibv2.dao.BoxCollection
getFileVersions
fileVersions
defaultRequest, fileId
java.util.List
getPreview
preview
extension, fileId, imageRequest
com.box.boxjavalibv2.dao.BoxPreview
getThumbnail
thumbnail
extension, fileId, imageRequest
com.box.boxjavalibv2.dao.BoxThumbnail
updateFileInfo
update
fileId, fileRequest
com.box.boxjavalibv2.dao.BoxFile
uploadFile
upload
fileUploadRequest
com.box.boxjavalibv2.dao.BoxFile
uploadNewVersion
upload
fileId, fileUploadRequest
com.box.boxjavalibv2.dao.BoxFile

URI Options for files and shared-files

Expand
Name
Type
defaultRequest
com.box.restclientv2.requestsbase.BoxDefaultRequestObject
destination
java.io.File
extension
String
fileId
String
fileRequest
com.box.boxjavalibv2.requests.requestobjects.BoxFileRequestObject
fileUploadRequest
com.box.restclientv2.requestsbase.BoxFileUploadRequestObject
imageRequest
com.box.boxjavalibv2.requests.requestobjects.BoxImageRequestObject
itemCopyRequest
com.box.boxjavalibv2.requests.requestobjects.BoxItemCopyRequestObject
listener
com.box.boxjavalibv2.filetransfer.IFileTransferListener
outputStreams
java.io.OutputStream[]
sharedLinkRequest
com.box.boxjavalibv2.requests.requestobjects.BoxSharedLinkRequestObject

Endpoint Prefix folders and shared-folders

For more information on Box folders see https://developers.box.com/docs/#folders. The following endpoints can be invoked with the prefix folders or shared-folders as follows. The prefix shared-folders requires sharedLink and sharedPassword properties.
    box://folders/endpoint?[options]
    box://shared-folders/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint
Shorthand Alias
Options
Result Body Type
copyFolder
folderId, itemCopyRequest
com.box.boxjavalibv2.dao.BoxFolder
createFolder
create
folderRequest
com.box.boxjavalibv2.dao.BoxFolder
createSharedLink
create
folderId, sharedLinkRequest
com.box.boxjavalibv2.dao.BoxFolder
deleteFolder
delete
folderDeleteRequest, folderId
getFolder
folder
defaultRequest, folderId
com.box.boxjavalibv2.dao.BoxFolder
getFolderCollaborations
folderCollaborations
defaultRequest, folderId
java.util.List
getFolderItems
folderItems
folderId, pagingRequest
com.box.boxjavalibv2.dao.BoxCollection
updateFolderInfo
update
folderId, folderRequest
com.box.boxjavalibv2.dao.BoxFolder

URI Options for folders or shared-folders

Expand
Name
Type
defaultRequest
com.box.restclientv2.requestsbase.BoxDefaultRequestObject
folderDeleteRequest
com.box.boxjavalibv2.requests.requestobjects.BoxFolderDeleteRequestObject
folderId
String
folderRequest
com.box.boxjavalibv2.requests.requestobjects.BoxFolderRequestObject
itemCopyRequest
com.box.boxjavalibv2.requests.requestobjects.BoxItemCopyRequestObject
pagingRequest
com.box.boxjavalibv2.requests.requestobjects.BoxPagingRequestObject
sharedLinkRequest
com.box.boxjavalibv2.requests.requestobjects.BoxSharedLinkRequestObject

Endpoint Prefix shared-items

For more information on Box shared items see https://developers.box.com/docs/#shared-items. The following endpoints can be invoked with the prefix shared-items as follows:
    box://shared-items/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint
Shorthand Alias
Options
Result Body Type
getSharedItem
sharedItem
defaultRequest
com.box.boxjavalibv2.dao.BoxItem

URI Options for shared-items

Expand
Name
Type
defaultRequest
com.box.restclientv2.requestsbase.BoxDefaultRequestObject

Endpoint Prefix users

For information on Box users see https://developers.box.com/docs/#users. The following endpoints can be invoked with the prefix users as follows:
    box://users/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint
Shorthand Alias
Options
Result Body Type
addEmailAlias
emailAliasRequest, userId
com.box.boxjavalibv2.dao.BoxEmailAlias
createEnterpriseUser
create
userRequest
com.box.boxjavalibv2.dao.BoxUser
deleteEmailAlias
defaultRequest, emailId, userId
deleteEnterpriseUser
userDeleteRequest, userId
getAllEnterpriseUser
allEnterpriseUser
defaultRequest, filterTerm
java.util.List
getCurrentUser
currentUser
defaultRequest
com.box.boxjavalibv2.dao.BoxUser
getEmailAliases
emailAliases
defaultRequest, userId
java.util.List
moveFolderToAnotherUser
folderId, simpleUserRequest, userId
com.box.boxjavalibv2.dao.BoxFolder
updateUserInformaiton
update
userId, userRequest
com.box.boxjavalibv2.dao.BoxUser
updateUserPrimaryLogin
update
userId, userUpdateLoginRequest
com.box.boxjavalibv2.dao.BoxUser

URI Options for users

Expand
Name
Type
defaultRequest
com.box.restclientv2.requestsbase.BoxDefaultRequestObject
emailAliasRequest
com.box.boxjavalibv2.requests.requestobjects.BoxEmailAliasRequestObject
emailId
String
filterTerm
String
folderId
String
simpleUserRequest
com.box.boxjavalibv2.requests.requestobjects.BoxSimpleUserRequestObject
userDeleteRequest
com.box.boxjavalibv2.requests.requestobjects.BoxUserDeleteRequestObject
userId
String
userRequest
com.box.boxjavalibv2.requests.requestobjects.BoxUserRequestObject
userUpdateLoginRequest
com.box.boxjavalibv2.requests.requestobjects.BoxUserUpdateLoginRequestObject

Consumer Endpoints:

For more information on Box events see https://developers.box.com/docs/#events and for long polling see https://developers.box.com/docs/#events-long-polling. Consumer endpoints can only use the endpoint prefix poll-events as shown in the example next. By default the consumer will split the com.box.boxjavalibv2.dao.BoxEventCollection from every long poll and create an exchange for every com.box.boxjavalibv2.dao.BoxEvent. To make the consumer return the entire collection in a single exchange, use the URI option consumer.splitResult=false.
    box://poll-events/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint
Shorthand Alias
Options
Result Body Type
poll
limit, streamPosition, streamType
com.box.boxjavalibv2.dao.BoxEvent by default, or com.box.boxjavalibv2.dao.BoxEventCollection when consumer.splitResult=false

URI Options for poll-events

Expand
Name
Type
limit
Integer
streamPosition
Long
streamType
String
splitResult
boolean

Message header

Any of the options can be provided in a message header for producer endpoints with CamelBox. prefix.

Message body

All result message bodies utilize objects provided by the Box Java SDK. Producer endpoints can specify the option name for incoming message body in the inBody endpoint parameter.

Type Converter

The Box component also provides a Camel type converter to convert GenericFile objects from File component to a com.box.restclientv2.requestsbase.BoxFileUploadRequestObject to upload files to Box.com. The target folderId for the upload can be specified in the exchange property CamelBox.folderId. If the exchange property is not specified the value defaults to "0" for the root folder ID.

Use cases

The following route uploads new files to the user's root folder:
	from("file:...")
		.to("box://files/upload/inBody=fileUploadRequest");
Copy to Clipboard Toggle word wrap
The following route polls user's account for updates:
	from("box://poll-events/poll?streamPosition=-1&streamType=all&limit=100")
		.to("bean:blah");
Copy to Clipboard Toggle word wrap
The following route uses a producer with dynamic header options. The fileId property has the Box file id , so its assigned to the CamelBox.fileId header as follows:
	from("direct:foo")
		.setHeader("CamelBox.fileId", header("fileId"))
		.to("box://files/download")
		.to("file://...");
Copy to Clipboard Toggle word wrap

Chapter 15. Browse

Browse Component

Available as of Apache Camel 2.0
The Browse component provides a simple BrowsableEndpoint which can be useful for testing, visualisation tools or debugging. The exchanges sent to the endpoint are all available to be browsed.

URI format

browse:someName
Copy to Clipboard Toggle word wrap
Where someName can be any string to uniquely identify the endpoint.

Sample

In the route below, we insert a browse: component to be able to browse the Exchanges that are passing through:
  from("activemq:order.in").to("browse:orderReceived").to("bean:processOrder");
Copy to Clipboard Toggle word wrap
We can now inspect the received exchanges from within the Java code:
    private CamelContext context;

    public void inspectRecievedOrders() {
        BrowsableEndpoint browse = context.getEndpoint("browse:orderReceived", BrowsableEndpoint.class);
        List<Exchange> exchanges = browse.getExchanges();
        ...
        // then we can inspect the list of received exchanges from Java
        for (Exchange exchange : exchanges) {
            String payload = exchange.getIn().getBody();
            ...
        }
   }

Copy to Clipboard Toggle word wrap

Chapter 16. Cache

16.1. Cache Component

Available as of Camel 2.1

The cache component enables you to perform caching operations using EHCache as the Cache Implementation. The cache itself is created on demand or if a cache of that name already exists then it is simply utilized with its original settings.
This component supports producer and event based consumer endpoints.
The Cache consumer is an event based consumer and can be used to listen and respond to specific cache activities. If you need to perform selections from a pre-existing cache, use the processors defined for the cache component.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-cache</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

cache://cacheName[?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?option=value&option=#beanRef&...

Options

The Cache component supports the following options:
Expand
Name Default Value Description
maxElementsInMemory 1000 The number of elements that may be stored in the defined cache
memoryStoreEvictionPolicy MemoryStoreEvictionPolicy.LFU
The number of elements that may be stored in the defined cache. Options include
  • MemoryStoreEvictionPolicy.LFU - Least frequently used
  • MemoryStoreEvictionPolicy.LRU - Least recently used
  • MemoryStoreEvictionPolicy.FIFO - first in first out, the oldest element by creation time
overflowToDisk true Specifies whether cache may overflow to disk
eternal false
Sets whether elements are eternal. If eternal, timeouts are ignored and the element never expires.
timeToLiveSeconds 300
The maximum time between creation time and when an element expires. Is used only if the element is not eternal
timeToIdleSeconds 300 The maximum amount of time between accesses before an element expires
diskPersistent false Whether the disk store persists between restarts of the Virtual Machine.
diskExpiryThreadIntervalSeconds 120 The number of seconds between runs of the disk expiry thread.
cacheManagerFactory null Camel 2.8: If you want to use a custom factory which instantiates and creates the EHCache net.sf.ehcache.CacheManager. Type: abstract org.apache.camel.component.cache.CacheManagerFactory
eventListenerRegistry null Camel 2.8: Sets a list of EHCache net.sf.ehcache.event.CacheEventListener for all new caches\- no need to define it per cache in EHCache xml config anymore. Type: org.apache.camel.component.cache.CacheEventListenerRegistry
cacheLoaderRegistry null Camel 2.8: Sets a list of org.apache.camel.component.cache.CacheLoaderWrapper that extends EHCache net.sf.ehcache.loader.CacheLoader for all new caches\- no need to define it per cache in EHCache xml config anymore. Type: org.apache.camel.component.cache.CacheLoaderRegistry
key null Camel 2.10: To configure using a cache key by default. If a key is provided in the message header, then the key from the header takes precedence.
operation null Camel 2.10: To configure using an cache operation by default. If an operation in the message header, then the operation from the header takes precedence.
objectCache false Camel 2.10: Whether to turn on allowing to store non serializable objects in the cache. If this option is enabled then overflow to disk cannot be enabled as well.
configurationFile
Camel 2.13/2.12.3: To configure the location of the ehcache.xml file to use, such as classpath:com/foo/mycache.xml to load from classpath. If no configuration is given, then the default settings from EHCache is used.
configuration
To use a custom org.apache.camel.component.cache.CacheConfiguration configuration.

Cache component options

Expand
Name
Default Value
Description
configuration
To use a custom org.apache.camel.component.cache.CacheConfiguration configuration.
cacheManagerFactory
To use a custom org.apache.camel.component.cache.CacheManagerFactory.
configurationFile
Camel 2.13/2.12.3: To configure the location of the ehcache.xml file to use, such as classpath:com/foo/mycache.xml to load from classpath. If no configuration is given, then the default settings from EHCache is used.

Message Headers Camel 2.8+

Expand
Header Description
CamelCacheOperation
The operation to be performed on the cache. The valid options are
  • CamelCacheGet
  • CamelCacheCheck
  • CamelCacheAdd
  • CamelCacheUpdate
  • CamelCacheDelete
  • CamelCacheDeleteAll
CamelCacheKey The cache key used to store the Message in the cache. The cache key is optional if the CamelCacheOperation is CamelCacheDeleteAll
Header changes in Camel 2.8
The header names and supported values have changed to be prefixed with CamelCache and use mixed case. This makes them easier to identify and keep separate from other headers. The CacheConstants variable names remain unchanged, just their values have been changed. Also, these headers are now removed from the exchange after the cache operation is performed.
The CamelCacheAdd and CamelCacheUpdate operations support additional headers:
Expand
Header Type Description
CamelCacheTimeToLive Integer Camel 2.11: Time to live in seconds.
CamelCacheTimeToIdle Integer Camel 2.11: Time to idle in seconds.
CamelCacheEternal Boolean Camel 2.11: Whether the content is eternal.

Cache Producer

Sending data to the cache involves the ability to direct payloads in exchanges to be stored in a pre-existing or created-on-demand cache. The mechanics of doing this involve
  • setting the Message Exchange Headers shown above.
  • ensuring that the Message Exchange Body contains the message directed to the cache

Cache Consumer

Receiving data from the cache involves the ability of the CacheConsumer to listen on a pre-existing or created-on-demand Cache using an event Listener and receive automatic notifications when any cache activity take place (i.e CamelCacheGet/CamelCacheUpdate/CamelCacheDelete/CamelCacheDeleteAll). Upon such an activity taking place
  • an exchange containing Message Exchange Headers and a Message Exchange Body containing the just added/updated payload is placed and sent.
  • in case of a CamelCacheDeleteAll operation, the Message Exchange Header CamelCacheKey and the Message Exchange Body are not populated.

Cache Processors

There are a set of nice processors with the ability to perform cache lookups and selectively replace payload content at the
  • body
  • token
  • xpath level

Example 1: Configuring the cache

from("cache://MyApplicationCache" +
          "?maxElementsInMemory=1000" +
          "&memoryStoreEvictionPolicy=" +
              "MemoryStoreEvictionPolicy.LFU" +
          "&overflowToDisk=true" +
          "&eternal=true" +
          "&timeToLiveSeconds=300" +
          "&timeToIdleSeconds=true" +
          "&diskPersistent=true" +
          "&diskExpiryThreadIntervalSeconds=300")
Copy to Clipboard Toggle word wrap

Example 2: Adding keys to the cache

RouteBuilder builder = new RouteBuilder() {
    public void configure() {
     from("direct:start")
     .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_OPERATION_ADD))
     .setHeader(CacheConstants.CACHE_KEY, constant("Ralph_Waldo_Emerson"))
     .to("cache://TestCache1")
   }
};
Copy to Clipboard Toggle word wrap

Example 2: Updating existing keys in a cache

RouteBuilder builder = new RouteBuilder() {
    public void configure() {
     from("direct:start")
     .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_OPERATION_UPDATE))
     .setHeader(CacheConstants.CACHE_KEY, constant("Ralph_Waldo_Emerson"))
     .to("cache://TestCache1")
   }
};
Copy to Clipboard Toggle word wrap

Example 3: Deleting existing keys in a cache

RouteBuilder builder = new RouteBuilder() {
    public void configure() {
     from("direct:start")
     .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_DELETE))
     .setHeader(CacheConstants.CACHE_KEY", constant("Ralph_Waldo_Emerson"))
     .to("cache://TestCache1")
   }
};
Copy to Clipboard Toggle word wrap

Example 4: Deleting all existing keys in a cache

RouteBuilder builder = new RouteBuilder() {
    public void configure() {
     from("direct:start")
     .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_DELETEALL))
     .to("cache://TestCache1");
    }
};
Copy to Clipboard Toggle word wrap
RouteBuilder builder = new RouteBuilder() {
    public void configure() {
     from("cache://TestCache1")
     .process(new Processor() {
        public void process(Exchange exchange)
               throws Exception {
           String operation = (String) exchange.getIn().getHeader(CacheConstants.CACHE_OPERATION);
           String key = (String) exchange.getIn().getHeader(CacheConstants.CACHE_KEY);
           Object body = exchange.getIn().getBody();
           // Do something
        }
     })
   }
};
Copy to Clipboard Toggle word wrap
RouteBuilder builder = new RouteBuilder() {
   public void configure() {
     //Message Body Replacer
     from("cache://TestCache1")
     .filter(header(CacheConstants.CACHE_KEY).isEqualTo("greeting"))
     .process(new CacheBasedMessageBodyReplacer("cache://TestCache1","farewell"))
     .to("direct:next");

    //Message Token replacer
    from("cache://TestCache1")
    .filter(header(CacheConstants.CACHE_KEY).isEqualTo("quote"))
    .process(new CacheBasedTokenReplacer("cache://TestCache1","novel","#novel#"))
    .process(new CacheBasedTokenReplacer("cache://TestCache1","author","#author#"))
    .process(new CacheBasedTokenReplacer("cache://TestCache1","number","#number#"))
    .to("direct:next");

    //Message XPath replacer
    from("cache://TestCache1").
    .filter(header(CacheConstants.CACHE_KEY).isEqualTo("XML_FRAGMENT"))
    .process(new CacheBasedXPathReplacer("cache://TestCache1","book1","/books/book1"))
    .process (new CacheBasedXPathReplacer("cache://TestCache1","book2","/books/book2"))
    .to("direct:next");
   }
};
Copy to Clipboard Toggle word wrap

Example 7: Getting an entry from the Cache

from("direct:start")
    // Prepare headers
    .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_OPERATION_GET))
    .setHeader(CacheConstants.CACHE_KEY, constant("Ralph_Waldo_Emerson")).
    .to("cache://TestCache1").
    // Check if entry was not found
    .choice().when(header(CacheConstants.CACHE_ELEMENT_WAS_FOUND).isNull()).
        // If not found, get the payload and put it to cache
        .to("cxf:bean:someHeavyweightOperation").
        .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_OPERATION_ADD))
        .setHeader(CacheConstants.CACHE_KEY, constant("Ralph_Waldo_Emerson"))
        .to("cache://TestCache1")
    .end()
    .to("direct:nextPhase");
Copy to Clipboard Toggle word wrap

Example 8: Checking for an entry in the Cache

Note: The CHECK command tests existence of an entry in the cache but doesn't place a message in the body.
from("direct:start")
    // Prepare headers
    .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_OPERATION_CHECK))
    .setHeader(CacheConstants.CACHE_KEY, constant("Ralph_Waldo_Emerson")).
    .to("cache://TestCache1").
    // Check if entry was not found
    .choice().when(header(CacheConstants.CACHE_ELEMENT_WAS_FOUND).isNull()).
        // If not found, get the payload and put it to cache
        .to("cxf:bean:someHeavyweightOperation").
        .setHeader(CacheConstants.CACHE_OPERATION, constant(CacheConstants.CACHE_OPERATION_ADD))
        .setHeader(CacheConstants.CACHE_KEY, constant("Ralph_Waldo_Emerson"))
        .to("cache://TestCache1")
    .end();
Copy to Clipboard Toggle word wrap

Management of EHCache

EHCache has its own statistics and management from JMX.
Here's a snippet on how to expose them via JMX in a Spring application context:
<bean id="ehCacheManagementService" class="net.sf.ehcache.management.ManagementService" init-method="init" lazy-init="false">
  <constructor-arg>
    <bean class="net.sf.ehcache.CacheManager" factory-method="getInstance"/>
  </constructor-arg>
  <constructor-arg>
    <bean class="org.springframework.jmx.support.JmxUtils" factory-method="locateMBeanServer"/>
  </constructor-arg>
  <constructor-arg value="true"/>
  <constructor-arg value="true"/>
  <constructor-arg value="true"/>
  <constructor-arg value="true"/>
</bean>
Copy to Clipboard Toggle word wrap
Of course you can do the same thing in straight Java:
ManagementService.registerMBeans(CacheManager.getInstance(), mbeanServer, true, true, true, true);
Copy to Clipboard Toggle word wrap
You can get cache hits, misses, in-memory hits, disk hits, size stats this way. You can also change CacheConfiguration parameters on the fly.

Cache replication Camel 2.8+

The Camel Cache component is able to distribute a cache across server nodes using several different replication mechanisms including: RMI, JGroups, JMS and Cache Server.
There are two different ways to make it work:
  1. You can configure ehcache.xml manually, or
  2. You can configure these three options:
    • cacheManagerFactory
    • eventListenerRegistry
    • cacheLoaderRegistry
Configuring Camel Cache replication using the first option is a bit of hard work as you have to configure all caches separately. So in a situation when the all names of caches are not known, using ehcache.xml is not a good idea.
The second option is much better when you want to use many different caches as you do not need to define options per cache. This is because replication options are set per CacheManager and per CacheEndpoint. Also it is the only way when cache names are not know at the development phase.
Note
It might be useful to read the EHCache manual to get a better understanding of the Camel Cache replication mechanism.

Example: JMS cache replication

JMS replication is the most powerful and secured replication method. Used together with Camel Cache replication makes it also rather simple. An example is available on a separate page.

16.2. cacheReplicationJMSExample

Example: JMS cache replication

Note
Please note, that this example is not finished yet. It is based on OSGi iTest instead of real life example. But no matter to that it is very good staring point for all Camel Cache Riders!
JMS replication is the most powerful and secured way. Used altogether with Camel Cache replication options is also the most easy way. This basic example is divided to few important steps that have to be made to get the cache replication to work.
The first step is to write your own implementation of CacheManagerFactory.
public class TestingCacheManagerFactory extends CacheManagerFactory {

[...]

    //This constructor is very useful when using Camel with Spring/Blueprint
    public TestingCacheManagerFactory(String xmlName, 
            TopicConnection replicationTopicConnection, Topic replicationTopic, 
            QueueConnection getQueueConnection, Queue getQueue) {
        this.xmlName = xmlName;
        this.replicationTopicConnection = replicationTopicConnection;
        this.replicationTopic = replicationTopic;
        this.getQueue = getQueue;
        this.getQueueConnection = getQueueConnection;
    }

    @Override
    protected synchronized CacheManager createCacheManagerInstance() {
        //Singleton
        if (cacheManager == null) {
            cacheManager = new WrappedCacheManager(getClass().getResourceAsStream(xmlName));
        }

        return cacheManager;
    }

    //Wrapping Ehcache's CacheManager to be able to add JMSCacheManagerPeerProvider
    public class WrappedCacheManager extends CacheManager {
        public WrappedCacheManager(InputStream xmlConfig) {
            super(xmlConfig);
            JMSCacheManagerPeerProvider jmsCMPP = new JMSCacheManagerPeerProvider(this,
                            replicationTopicConnection,
                            replicationTopic,
                            getQueueConnection,
                            getQueue,
                            AcknowledgementMode.AUTO_ACKNOWLEDGE,
                            true);
            cacheManagerPeerProviders.put(jmsCMPP.getScheme(), jmsCMPP);
            jmsCMPP.init();
        }
    }
}
Copy to Clipboard Toggle word wrap
Next step is to write your own implementation of CacheLoaderWrapper, the easiest one is:
public class WrappedJMSCacheLoader implements CacheLoaderWrapper {

[...]

    //This constructor is very useful when using Camel with Spring/Blueprint
    public WrappedJMSCacheLoader(QueueConnection getQueueConnection,
            Queue getQueue, AcknowledgementMode acknowledgementMode,
            int timeoutMillis) {
        this.getQueueConnection = getQueueConnection;
        this.getQueue = getQueue;
        this.acknowledgementMode = acknowledgementMode;
        this.timeoutMillis = timeoutMillis;
    }

    @Override
    public void init(Ehcache cache) {
        jmsCacheLoader = new JMSCacheLoader(cache, defaultLoaderArgument,
                getQueueConnection, getQueue, acknowledgementMode,
                timeoutMillis);
    }

    @Override
    public CacheLoader clone(Ehcache arg0) throws CloneNotSupportedException {
        return jmsCacheLoader.clone(arg0);
    }

    @Override
    public void dispose() throws CacheException {
        jmsCacheLoader.dispose();
    }

[...]

}
Copy to Clipboard Toggle word wrap
At the third step you can take care about Camel Cache options (prepare their values):
  • cacheManagerFactory
  • eventListenerRegistry
  • cacheLoaderRegistry
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:camel="http://camel.apache.org/schema/spring"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">

    <bean id="queueConnection1" factory-bean="amqCF" factory-method="createQueueConnection" class="javax.jms.QueueConnection" />
    <bean id="topicConnection1" factory-bean="amqCF" factory-method="createTopicConnection" class="javax.jms.TopicConnection" />
    <bean id="queue1" class="org.apache.activemq.command.ActiveMQQueue">
        <constructor-arg ref="getQueue" />
    </bean>
    <bean id="topic1" class="org.apache.activemq.command.ActiveMQTopic">
        <constructor-arg ref="getTopic" />
    </bean>

    <bean id="jmsListener1" class="net.sf.ehcache.distribution.jms.JMSCacheReplicator">
        <constructor-arg index="0" value="true" />
        <constructor-arg index="1" value="true" />
        <constructor-arg index="2" value="true" />
        <constructor-arg index="3" value="true" />
        <constructor-arg index="4" value="false" />
        <constructor-arg index="5" value="0" />
    </bean>

    <bean id="jmsLoader1" class="my.cache.replication.WrappedJMSCacheLoader">
        <constructor-arg index="0" ref="queueConnection1" />
        <constructor-arg index="1" ref="queue1" />
        <constructor-arg index="2" value="AUTO_ACKNOWLEDGE" />
        <constructor-arg index="3" value="30000" />
    </bean>

    <bean id="cacheManagerFactory1" class="my.cache.replication.TestingCacheManagerFactory">
        <constructor-arg index="0" value="ehcache_jms_test.xml" />
        <constructor-arg index="1" ref="topicConnection1" />
        <constructor-arg index="2" ref="topic1" />
        <constructor-arg index="3" ref="queueConnection1" />
        <constructor-arg index="4" ref="queue1" />
    </bean>

    <bean id="eventListenerRegistry1" class="org.apache.camel.component.cache.CacheEventListenerRegistry">
        <constructor-arg>
            <list>
                <ref bean="jmsListener1" />
            </list>
        </constructor-arg>
    </bean>

    <bean id="cacheLoaderRegistry1" class="org.apache.camel.component.cache.CacheLoaderRegistry">
        <constructor-arg>
            <list>
                <ref bean="jmsLoader1"/>
            </list>
        </constructor-arg>
    </bean>
</beans>
Copy to Clipboard Toggle word wrap
The final step is to define some routes using Cache component
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:camel="http://camel.apache.org/schema/spring"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">

    <bean id="getQueue" class="java.lang.String">
        <constructor-arg value="replicationGetQueue" />
    </bean>

    <bean id="getTopic" class="java.lang.String">
        <constructor-arg value="replicationTopic" />
    </bean>

    <!-- Import the xml file explained at step three -->
    <import resource="JMSReplicationCache1.xml"/>

    <camelContext xmlns="http://camel.apache.org/schema/spring">
        <camel:endpoint id="fooCache1" uri="cache:foo?cacheManagerFactory=#cacheManagerFactory1&ventListenerRegistry=#eventListenerRegistry1&acheLoaderRegistry=#cacheLoaderRegistry1"/>

        <camel:route>
            <camel:from uri="direct:addRoute"/>
            <camel:setHeader headerName="CamelCacheOperation">
                <camel:constant>CamelCacheAdd</camel:constant>
            </camel:setHeader>
            <camel:setHeader headerName="CamelCacheKey">
                <camel:constant>foo</camel:constant>
            </camel:setHeader>
            <camel:to ref="fooCache1"/>
        </camel:route>

    </camelContext>

    <bean id="amqCF" class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL" value="vm://localhost?broker.persistent=false"/>
    </bean>

    <bean id="activemq" class="org.apache.camel.component.jms.JmsComponent">
        <property name="connectionFactory">
            <ref bean="amqCF"/>
        </property>
    </bean>

</beans>
Copy to Clipboard Toggle word wrap

Chapter 17. Cassandra

Camel Cassandra Component

Available as of Camel 2.15
Apache Cassandra is an open source NoSQL database designed to handle large amounts on commodity hardware. Like Amazon's DynamoDB, Cassandra has a peer-to-peer and master-less architecture to avoid single point of failure and garanty high availability. Like Google's BigTable, Cassandra data is structured using column families which can be accessed through the Thrift RPC API or a SQL-like API called CQL.
This component aims at integrating Cassandra 2.0+ using the CQL3 API (not the Thrift API). It's based on Cassandra Java Driver provided by DataStax.
Maven users will need to add the following dependency to their pom.xml:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-cassandraql</artifactId>
    <version>x.y.z</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

The endpoint can initiate the Cassandra connection or use an existing one.
Expand
URI Description
cql:localhost/keyspace Single host, default port, usual for testing
cql:host1,host2/keyspace Multi host, default port
cql:host1,host2:9042/keyspace Multi host, custom port
cql:host1,host2 Default port and keyspace
cql:bean:sessionRef Provided Session reference
cql:bean:clusterRef/keyspace Provided Cluster reference
To fine tune the Cassandra connection (SSL options, pooling options, load balancing policy, retry policy, reconnection policy...), create your own Cluster instance and give it to the Camel endpoint.

Endpoint Options

Expand
Option Default Description
clusterName
Cluster name
username and password
Session authentication
cql
CQL query. Can be overriden with a message header.
consistencyLevel
ANY, ONE, TWO, QUORUM, LOCAL_QUORUM...
prepareStatements true Use prepared statement (default) or not
resultSetConversionStrategy
ALL
How is ResultSet converted transformed into message body ALL, ONE, LIMIT_10, LIMIT_100...

Messages

Incoming Message

The Camel Cassandra endpoint expects a bunch of simple objects (Object or Object[] or Collection<Object>) which will be bound to the CQL statement as query parameters. If message body is null or empty, then CQL query will be executed without binding parameters.
Headers:
  • CamelCqlQuery (optional, String or RegularStatement): CQL query either as a plain String or built using the QueryBuilder.

Outgoing Message

The Camel Cassandra endpoint produces one or many a Cassandra Row objects depending on the resultSetConversionStrategy:
  • List<Row> if resultSetConversionStrategy is ALL or LIMIT_[0-9]+
  • Single Row if resultSetConversionStrategy is ONE
  • Anything else, if resultSetConversionStrategy is a custom implementation of the ResultSetConversionStrategy

Repositories

Cassandra can be used to store message keys or messages for the idempotent and aggregation EIP.
Cassandra might not be the best tool for queuing use cases yet, read Cassandra anti-patterns queues and queue like datasets. It's advised to use LeveledCompaction and a small GC grace setting for these tables to allow tombstoned rows to be removed quickly.

Idempotent repository

The NamedCassandraIdempotentRepository stores messages keys in a Cassandra table like this:
CREATE TABLE CAMEL_IDEMPOTENT (
  NAME varchar,   -- Repository name
  KEY varchar,    -- Message key
  PRIMARY KEY (NAME, KEY)
) WITH compaction = {'class':'LeveledCompactionStrategy'}
  AND gc_grace_seconds = 86400;
Copy to Clipboard Toggle word wrap
This repository implementation uses lightweight transactions (also known as Compare and Set) and requires Cassandra 2.0.7+.
Alternatively, the CassandraIdempotentRepository does not have a NAME column and can be extended to use a different data model.
Expand
Option Default Description
table CAMEL_IDEMPOTENT Table name
pkColumns NAME, KEY Primary key columns
name Repository name, value used for NAME column
ttl Key time to live
writeConsistencyLevel Consistency level used to insert/delete key: ANY, ONE, TWO, QUORUM, LOCAL_QUORUM
readConsistencyLevel Consistency level used to read/check key: ONE, TWO, QUORUM, LOCAL_QUORUM

Aggregation repository

The NamedCassandraAggregationRepository stores exchanges by correlation key in a Cassandra table like this:
CREATE TABLE CAMEL_AGGREGATION (
  NAME varchar,        -- Repository name
  KEY varchar,         -- Correlation id
  EXCHANGE_ID varchar, -- Exchange id
  EXCHANGE blob,       -- Serialized exchange
  PRIMARY KEY (NAME, KEY)
) WITH compaction = {'class':'LeveledCompactionStrategy'}
  AND gc_grace_seconds = 86400;
Copy to Clipboard Toggle word wrap
Alternatively, the CassandraAggregationRepository does not have a NAME column and can be extended to use a different data model.
Expand
Option Default Description
table CAMEL_AGGREGATION Table name
pkColumns NAME,KEY Primary key columns
exchangeIdColumn EXCHANGE_ID Exchange Id column
exchangeColumn EXCHANGE Exchange content column
name Repository name, value used for NAME column
ttl Exchange time to live
writeConsistencyLevel Consistency level used to insert/delete exchange: ANY, ONE, TWO, QUORUM, LOCAL_QUORUM
readConsistencyLevel Consistency level used to read/check exchange: ONE, TWO, QUORUM, LOCAL_QUORUM

Chapter 18. Chunk

Chunk Component

Available as of Camel 2.15
The chunk: component allows for processing a message using a Chunk template. This can be ideal when using Templating to generate responses for requests.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-chunk</artifactId>
<version>x.x.x</version> <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

chunk:templateName[?options]
Copy to Clipboard Toggle word wrap
Where templateName is the classpath-local URI of the template to invoke.
You can append query options to the URI in the following format, ?option=value&option=value&...

Options

Expand
Option
Default
Description
encoding
null
Character encoding of the resource content.
themesFolder
null
Alternative folder to scan for a template name.
themeSubfolder
null
Alternative subfolder to scan for a template name if themeFolder parameter is set.
themeLayer
null
A specific layer of a template file to use as template.
extension
null
Alternative extension to scan for a template name if themeFolder and themeSubfolder are set.
Chunk component will look for a specific template in themes folder with extensions .chtml or .cxml. If you need to specify a different folder or extensions, you will need to use the specific options listed above.

Chunk Context

Camel will provide exchange information in the Chunk context (just a Map). The Exchange is transferred as:
Expand
key
value
exchange
The Exchange itself.
exchange.properties
The Exchange properties.
headers
The headers of the In message.
camelContext
The Camel Context.
request
The In message.
body
The In message body.
response
The Out message (only for InOut message exchange pattern).

Dynamic templates

Camel provides two headers by which you can define a different resource location for a template or the template content itself. If any of these headers is set then Camel uses this over the endpoint configured resource. This allows you to provide a dynamic template at runtime.
Expand
Header
Type
Description
Support Version
ChunkConstants.CHUNK_RESOURCE_URI
String
A URI for the template resource to use instead of the endpoint configured.
ChunkConstants.CHUNK_TEMPLATE
String
The template to use instead of the endpoint configured.

Samples

For example you could use something like:
from("activemq:My.Queue").
to("chunk:template");
Copy to Clipboard Toggle word wrap
To use a Chunk template to formulate a response for a message for InOut message exchanges (where there is a JMSReplyTo header).
If you want to use InOnly and consume the message and send it to another destination you could use:
from("activemq:My.Queue").
to("chunk:template").
to("activemq:Another.Queue");
Copy to Clipboard Toggle word wrap
It's possible to specify what template the component should use dynamically via a header, so for example:
from("direct:in").
setHeader(ChunkConstants.CHUNK_RESOURCE_URI).constant("template").
to("chunk:dummy");
Copy to Clipboard Toggle word wrap
An example of Chunk component options use:
from("direct:in").
to("chunk:file_example?themeFolder=template&themeSubfolder=subfolder&extension=chunk");
Copy to Clipboard Toggle word wrap
In this example Chunk component will look for the file file_example.chunk in the folder template/subfolder.

The Email Sample

In this sample we want to use Chunk templating for an order confirmation email. The email template is laid out in Chunk as:
Dear {$headers.lastName}, {$headers.firstName}

Thanks for the order of {$headers.item}.

Regards Camel Riders Bookstore
{$body}
Copy to Clipboard Toggle word wrap

Chapter 19. Class

Class Component

Available as of Apache Camel 2.4
The class: component binds beans to message exchanges. It works in the same way as the Bean component but instead of looking up beans from a Registry it creates the bean based on the class name.

URI format

class:className[?options]
Copy to Clipboard Toggle word wrap
Where className is the fully qualified class name to create and use as bean.

Options

Expand
Name Type Default Description
method String null The method name that bean will be invoked. If not provided, Apache Camel will try to pick the method itself. In case of ambiguity an exception is thrown. See Bean Binding for more details.
multiParameterArray boolean false How to treat the parameters which are passed from the message body; if it is true, the In message body should be an array of parameters.
You can append query options to the URI in the following format, ?option=value&option=value&...

Using

You simply use the class component just as the Bean component but by specifying the fully qualified classname instead. For example to use the MyFooBean you have to do as follows:
from("direct:start").to("class:org.apache.camel.component.bean.MyFooBean").to("mock:result");
Copy to Clipboard Toggle word wrap
You can also specify which method to invoke on the MyFooBean, for example hello:
from("direct:start").to("class:org.apache.camel.component.bean.MyFooBean?method=hello").to("mock:result");
Copy to Clipboard Toggle word wrap

Setting properties on the created instance

In the endpoint uri you can specify properties to set on the created instance, for example if it has a setPrefix method:
from("direct:start")
    .to("class:org.apache.camel.component.bean.MyPrefixBean?prefix=Bye")
    .to("mock:result");
Copy to Clipboard Toggle word wrap
And you can also use the # syntax to refer to properties to be looked up in the Registry.
from("direct:start")
    .to("class:org.apache.camel.component.bean.MyPrefixBean?cool=#foo")
    .to("mock:result");
Copy to Clipboard Toggle word wrap
Which will lookup a bean from the Registry with the id foo and invoke the setCool method on the created instance of the MyPrefixBean class.
Note
See more details at the Bean component as the class component works in much the same way.

Chapter 20. CMIS

CMIS Component

Available as of Camel 2.11 The cmis component uses the Apache Chemistry client API and allows you to add/read nodes to/from a CMIS compliant content repositories.

URI Format

cmis://cmisServerUrl[?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options

Expand
Name Default Value Context Description
queryMode false Producer If true, will execute the cmis query from the message body and return result, otherwise will create a node in the cmis repository
query String Consumer The cmis query to execute against the repository. If not specified, the consumer will retrieve every node from the content repository by iterating the content tree recursively
username null Both Username for the cmis repository
password null Both Password for the cmis repository
repositoryId null Both The Id of the repository to use. If not specified the first available repository is used
pageSize 100 Both Number of nodes to retrieve per page
readCount 0 Both Max number of nodes to read
readContent false Both If set to true, the content of document node will be retrieved in addition to the properties

Usage

Message headers evaluated by the producer

Expand
Header Default Value Description
CamelCMISFolderPath / The current folder to use during the execution. If not specified will use the root folder
CamelCMISRetrieveContent false In queryMode this header will force the producer to retrieve the content of document nodes.
CamelCMISReadSize 0 Max number of nodes to read.
cmis:path null If CamelCMISFolderPath is not set, will try to find out the path of the node from this cmis property and it is name
cmis:name null If CamelCMISFolderPath is not set, will try to find out the path of the node from this cmis property and it is path
cmis:objectTypeId null The type of the node
cmis:contentStreamMimeType null The mimetype to set for a document
Expand
Header Type Description
CamelCMISResultCount Integer Number of nodes returned from the query.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-cmis</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Camel (2.11 or higher).

Chapter 21. Cometd

Cometd Component

The cometd: component is a transport for working with the jetty implementation of the cometd/bayeux protocol. Using this component in combination with the dojo toolkit library it's possible to push Apache Camel messages directly into the browser using an AJAX based mechanism.

URI format

cometd://host:port/channelName[?options]
Copy to Clipboard Toggle word wrap
The channelName represents a topic that can be subscribed to by the Apache Camel endpoints.

Examples

cometd://localhost:8080/service/mychannel
cometds://localhost:8443/service/mychannel
Copy to Clipboard Toggle word wrap
where cometds: represents an SSL configured endpoint.

Options

Expand
Name Default Value Description
resourceBase The root directory for the web resources or classpath. Use the protocol file: or classpath: depending if you want that the component loads the resource from file system or classpath. Classpath is required for OSGI deployment where the resources are packaged in the jar
baseResource Camel 2.7: The root directory for the web resources or classpath. Use the protocol file: or classpath: depending if you want that the component loads the resource from file system or classpath. Classpath is required for OSGI deployment where the resources are packaged in the jar
timeout 240000 The server side poll timeout in milliseconds. This is how long the server will hold a reconnect request before responding.
interval 0 The client side poll timeout in milliseconds. How long a client will wait between reconnects
maxInterval 30000 The max client side poll timeout in milliseconds. A client will be removed if a connection is not received in this time.
multiFrameInterval 1500 The client side poll timeout, if multiple connections are detected from the same browser.
jsonCommented true If true, the server will accept JSON wrapped in a comment and will generate JSON wrapped in a comment. This is a defence against Ajax Hijacking.
logLevel 1 0=none, 1=info, 2=debug.
sslContextParameters Camel 2.9: Reference to a org.apache.camel.util.jsse.SSLContextParameters in the Registry. This reference overrides any configured SSLContextParameters at the component level. See Using the JSSE Configuration Utility.
crossOriginFilterOn false Camel 2.10: If true, the server will support for cross-domain filtering
allowedOrigins * Camel 2.10: The origins domain that support to cross, if the crosssOriginFilterOn is true
filterPath Camel 2.10: The filterPath will be used by the CrossOriginFilter, if the crosssOriginFilterOn is true
disconnectLocalSession true Camel 2.10.5/2.11.1: (Producer only): Whether to disconnect local sessions after publishing a message to its channel. Disconnecting local session is needed as they are not swept by default by CometD, and therefore you can run out of memory.
You can append query options to the URI in the following format, ?option=value&option=value&...
Here is some examples of how to pass the parameters.
For file (when the Webapp resources are located in the Web Application directory) cometd://localhost:8080?resourceBase=file./webapp. For classpath (when the web resources are packaged inside the Webapp folder) cometd://localhost:8080?resourceBase=classpath:webapp.

Authentication

Available as of Camel 2.8
You can configure custom SecurityPolicy and Extension's to the CometdComponent which allows you to use authentication as documented here

Setting up SSL for Cometd Component

Using the JSSE Configuration Utility

As of Camel 2.9, the Cometd component supports SSL/TLS configuration through the Camel JSSE Configuration Utility. This utility greatly decreases the amount of component specific code you need to write and is configurable at the endpoint and component levels. The following examples demonstrate how to use the utility with the Cometd component. You need to configure SSL on the CometdComponent class.

Programmatic configuration of the component

KeyStoreParameters ksp = new KeyStoreParameters();
ksp.setResource("/users/home/server/keystore.jks");
ksp.setPassword("keystorePassword");

KeyManagersParameters kmp = new KeyManagersParameters();
kmp.setKeyStore(ksp);
kmp.setKeyPassword("keyPassword");

TrustManagersParameters tmp = new TrustManagersParameters();
tmp.setKeyStore(ksp);

SSLContextParameters scp = new SSLContextParameters();
scp.setKeyManagers(kmp);
scp.setTrustManagers(tmp);

CometdComponent commetdComponent = getContext().getComponent("cometds", CometdComponent.class);
commetdComponent.setSslContextParameters(scp);
Copy to Clipboard Toggle word wrap

Spring DSL based configuration of endpoint

...
  <camel:sslContextParameters
      id="sslContextParameters">
    <camel:keyManagers
        keyPassword="keyPassword">
      <camel:keyStore
          resource="/users/home/server/keystore.jks"
          password="keystorePassword"/>
    </camel:keyManagers>
    <camel:trustManagers>
      <camel:keyStore
          resource="/users/home/server/keystore.jks"
          password="keystorePassword"/>
    </camel:keyManagers>
  </camel:sslContextParameters>

  <bean id="cometd" class="org. apache. camel. component.cometd.CometdComponent">
    <property name="sslContextParameters" ref="sslContextParameters"/>
  </bean>
  ...
  <to uri="cometds://127.0.0.1:443/service/test?baseResource=file:./target/test-classes/webapp&timeout=240000&interval=0&maxInterval=30000&multiFrameInterval=1500&jsonCommented=true&logLevel=2&sslContextParameters=#sslContextParameters"/>...
Copy to Clipboard Toggle word wrap

Chapter 22. Context

Context Component

Available as of Camel 2.7
The context component allows you to create new Camel Components from a CamelContext with a number of routes which is then treated as a black box, allowing you to refer to the local endpoints within the component from other CamelContexts.
It is similar to the Routebox component in idea, though the Context component tries to be really simple for end users; just a simple convention over configuration approach to refer to local endpoints inside the CamelContext Component.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-context</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

Copy to Clipboard Toggle word wrap

URI format

context:camelContextId:localEndpointName[?options]

Copy to Clipboard Toggle word wrap
Or you can omit the "context:" prefix.
camelContextId:localEndpointName[?options]

Copy to Clipboard Toggle word wrap
  • camelContextId is the ID you used to register the CamelContext into the Registry.
  • localEndpointName can be a valid Camel URI evaluated within the black box CamelContext. Or it can be a logical name which is mapped to any local endpoints. For example if you locally have endpoints like direct:invoices and seda:purchaseOrders inside a CamelContext of id supplyChain, then you can just use the URIs supplyChain:invoices or supplyChain:purchaseOrders to omit the physical endpoint kind and use pure logical URIs.
You can append query options to the URI in the following format, ?option=value&option=value&...

Example

In this example we'll create a black box context, then we'll use it from another CamelContext.

Defining the context component

First you need to create a CamelContext, add some routes in it, start it and then register the CamelContext into the Registry (JNDI, Spring, Guice or OSGi etc).
This can be done in the usual Camel way from this test case (see the createRegistry() method); this example shows Java and JNDI being used...
// lets create our black box as a camel context and a set of routes
DefaultCamelContext blackBox = new DefaultCamelContext(registry);
blackBox.setName("blackBox");
blackBox.addRoutes(new RouteBuilder() {
    @Override
    public void configure() throws Exception {
        // receive purchase orders, lets process it in some way then send an invoice
        // to our invoice endpoint
        from("direct:purchaseOrder").
          setHeader("received").constant("true").
          to("direct:invoice");
    }
});
blackBox.start();

registry.bind("accounts", blackBox);

Copy to Clipboard Toggle word wrap
Notice in the above route we are using pure local endpoints (direct and seda). Also note we expose this CamelContext using the accounts ID. We can do the same thing in Spring via
<camelContext id="accounts" xmlns="http://camel.apache.org/schema/spring">
  <route> 
    <from uri="direct:purchaseOrder"/>
    ...
    <to uri="direct:invoice"/>
  </route>
</camelContext>

Copy to Clipboard Toggle word wrap

Using the context component

Then in another CamelContext we can then refer to this "accounts black box" by just sending to accounts:purchaseOrder and consuming from accounts:invoice.
If you prefer to be more verbose and explicit you could use context:accounts:purchaseOrder or even context:accounts:direct://purchaseOrder if you prefer. But using logical endpoint URIs is preferred as it hides the implementation detail and provides a simple logical naming scheme.
For example if we wish to then expose this accounts black box on some middleware (outside of the black box) we can do things like...
<camelContext xmlns="http://camel.apache.org/schema/spring">
  <route> 
    <!-- consume from an ActiveMQ into the black box -->
    <from uri="activemq:Accounts.PurchaseOrders"/>
    <to uri="accounts:purchaseOrders"/>
  </route>
  <route> 
    <!-- lets send invoices from the black box to a different ActiveMQ Queue -->
    <from uri="accounts:invoice"/>
    <to uri="activemq:UK.Accounts.Invoices"/>
  </route>
</camelContext>

Copy to Clipboard Toggle word wrap

Naming endpoints

A context component instance can have many public input and output endpoints that can be accessed from outside it's CamelContext. When there are many it is recommended that you use logical names for them to hide the middleware as shown above.
However when there is only one input, output or error/dead letter endpoint in a component we recommend using the common posix shell names in, out and err

Chapter 23. ControlBus Component

ControlBus Component

Available as of Camel 2.11
The controlbus: component provides easy management of Camel applications based on the Control Bus EIP pattern. For example, by sending a message to an Endpoint you can control the lifecycle of routes, or gather performance statistics.
controlbus:command[?options]
Copy to Clipboard Toggle word wrap
Where command can be any string to identify which type of command to use.

Commands

Expand
Command Description
route To control routes using the routeId and action parameter.
language Allows you to specify a Language to use for evaluating the message body. If there is any result from the evaluation, then the result is put in the message body.

Options

Expand
Name Default Value Description
routeId null To specify a route by its id.
action null To denote an action that can be either: start, stop, or status. To either start or stop a route, or to get the status of the route as output in the message body. You can use suspend and resume from Camel 2.11.1 onwards to either suspend or resume a route. And from Camel 2.11.1 onwards you can use stats to get performance statics returned in XML format; the routeId option can be used to define which route to get the performance stats for, if routeId is not defined, then you get statistics for the entire CamelContext.
async false Whether to execute the control bus task asynchronously. Important: If this option is enabled, then any result from the task is not set on the Exchange. This is only possible if executing tasks synchronously.
loggingLevel INFO Logging level used for logging when task is done, or if any exceptions occurred during processing the task.
You can append query options to the URI in the following format, ?option=value&option=value&...

Samples

Using route command

The route command allows you to do common tasks on a given route very easily, for example to start a route, you can send an empty message to this endpoint:
template.sendBody("controlbus:route?routeId=foo&action=start", null);
Copy to Clipboard Toggle word wrap
To get the status of the route, you can do:
String status = template.requestBody("controlbus:route?routeId=foo&action=status", null, String.class);
Copy to Clipboard Toggle word wrap

Getting performance statistics

Available as of Camel 2.11.1
This requires JMX to be enabled (is by default) then you can get the performance statics per route, or for the CamelContext. For example to get the statics for a route named foo, we can do:
String xml = template.requestBody("controlbus:route?routeId=foo&action=stats", null, String.class);
Copy to Clipboard Toggle word wrap
The returned statics is in XML format. Its the same data you can get from JMX with the dumpRouteStatsAsXml operation on the ManagedRouteMBean.
To get statics for the entire CamelContext you just omit the routeId parameter as shown below:
String xml = template.requestBody("controlbus:route?action=stats", null, String.class);
Copy to Clipboard Toggle word wrap

Using Simple language

You can use the Simple language with the control bus, for example to stop a specific route, you can send a message to the "controlbus:language:simple" endpoint containing the following message:
template.sendBody("controlbus:language:simple", "${camelContext.stopRoute('myRoute')}");
Copy to Clipboard Toggle word wrap
As this is a void operation, no result is returned. However, if you want the route status you can do:
String status = template.requestBody("controlbus:language:simple", "${camelContext.getRouteStatus('myRoute')}", String.class);
Copy to Clipboard Toggle word wrap
Notice: its easier to use the route command to control lifecycle of routes. The language command allows you to execute a language script that has stronger powers such as Groovy or to some extend the Simple language.
For example to shutdown Camel itself you can do:
template.sendBody("controlbus:language:simple?async=true", "${camelContext.stop()}");
Copy to Clipboard Toggle word wrap
Notice we use async=true to stop Camel asynchronously as otherwise we would be trying to stop Camel while it was in-flight processing the message we sent to the control bus component.
Note
You can also use other languages such as Groovy, etc.

Chapter 24. CouchDB

Camel CouchDB component

Available as of Camel 2.11
The couchdb: component allows you to treat CouchDB instances as a producer or consumer of messages. Using the lightweight LightCouch API, this camel component has the following features:
  • As a consumer, monitors couch changesets for inserts, updates and deletes and publishes these as messages into camel routes.
  • As a producer, can save or update documents into couch.
  • Can support as many endpoints as required, eg for multiple databases across multiple instances.
  • Ability to have events trigger for only deletes, only inserts/updates or all (default).
  • Headers set for sequenceId, document revision, document id, and HTTP method type.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-couchdb</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

couchdb:http://hostname[:port]/database?[options]
Copy to Clipboard Toggle word wrap
Where hostname is the hostname of the running couchdb instance. Port is optional and if not specified then defaults to 5984.

Options

Expand
Property Default Description
deletes true document deletes are published as events
updates true document inserts/updates are published as events
heartbeat 30000 how often to send an empty message to keep socket alive in millis
createDatabase true create the database if it does not already exist
username null username in case of authenticated databases
password null password for authenticated databases

Headers

The following headers are set on exchanges during message transport.
Expand
Property Value
CouchDbDatabase the database the message came from
CouchDbSeq the couchdb changeset sequence number of the update / delete message
CouchDbId the couchdb document id
CouchDbRev the couchdb document revision
CouchDbMethod the method (delete / update)
Headers are set by the consumer once the message is received. The producer will also set the headers for downstream processors once the insert/update has taken place. Any headers set prior to the producer are ignored. That means for example, if you set CouchDbId as a header, it will not be used as the id for insertion, the id of the document will still be used.

Message Body

The component will use the message body as the document to be inserted. If the body is an instance of String, then it will be marshalled into a GSON object before insert. This means that the string must be valid JSON or the insert / update will fail. If the body is an instance of a com.google.gson.JsonElement then it will be inserted as is. Otherwise the producer will throw an exception of unsupported body type.

Samples

For example if you wish to consume all inserts, updates and deletes from a CouchDB instance running locally, on port 9999 then you could use the following:
from("couchdb:http://localhost:9999").process(someProcessor);
Copy to Clipboard Toggle word wrap
If you were only interested in deletes, then you could use the following
from("couchdb:http://localhost:9999?updates=false").process(someProcessor);
Copy to Clipboard Toggle word wrap
If you wanted to insert a message as a document, then the body of the exchange is used
from("someProducingEndpoint").process(someProcessor).to("couchdb:http://localhost:9999")
Copy to Clipboard Toggle word wrap

Chapter 25. Crypto (Digital Signatures)

Crypto component for Digital Signatures

Available as of Apache Camel 2.3
Using Apache Camel cryptographic endpoints and Java's Cryptographic extension it is easy to create Digital Signatures for Exchanges. Apache Camel provides a pair of flexible endpoints which get used in concert to create a signature for an exchange in one part of the exchange's workflow and then verify the signature in a later part of the workflow.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-crypto</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

Introduction

Digital signatures make use Asymmetric Cryptographic techniques to sign messages. From a (very) high level, the algorithms use pairs of complimentary keys with the special property that data encrypted with one key can only be decrypted with the other. One, the private key, is closely guarded and used to 'sign' the message while the other, public key, is shared around to anyone interested in verifying your messages. Messages are signed by encrypting a digest of the message with the private key. This encrypted digest is transmitted along with the message. On the other side the verifier recalculates the message digest and uses the public key to decrypt the the digest in the signature. If both digest match the verifier knows only the holder of the private key could have created the signature.
Apache Camel uses the Signature service from the Java Cryptographic Extension to do all the heavy cryptographic lifting required to create exchange signatures. The following are some excellent sources for explaining the mechanics of Cryptography, Message digests and Digital Signatures and how to leverage them with the JCE.
  • Bruce Schneier's Applied Cryptography
  • Beginning Cryptography with Java by David Hook
  • The ever insightful, Wikipedia Digital_signatures

URI format

As mentioned Apache Camel provides a pair of crypto endpoints to create and verify signatures
crypto:sign:name[?options]
crypto:verify:name[?options]
Copy to Clipboard Toggle word wrap
  • crypto:sign creates the signature and stores it in the Header keyed by the constant Exchange.SIGNATURE, i.e. "CamelDigitalSignature".
  • crypto:verify will read in the contents of this header and do the verification calculation.
In order to correctly function, sign and verify need to share a pair of keys, sign requiring a PrivateKey and verify a PublicKey (or a Certificate containing one). Using the JCE is is very simple to generate these key pairs but it is usually most secure to use a KeyStore to house and share your keys. The DSL is very flexible about how keys are supplied and provides a number of mechanisms.
Note a crypto:sign endpoint is typically defined in one route and the complimentary crypto:verify in another, though for simplicity in the examples they appear one after the other. It goes without saying that both sign and verify should be configured identically.

Options

Expand
Name Type Default Description
algorithm String DSA The name of the JCE Signature algorithm that will be used.
alias String null An alias name that will be used to select a key from the keystore.
bufferSize Integer 2048 the size of the buffer used in the signature process.
certificate Certificate null A Certificate used to verify the signature of the exchange's payload. Either this or a Public Key is required.
keystore KeyStore null A reference to a JCE Keystore that stores keys and certificates used to sign and verify.
provider String null The name of the JCE Security Provider that should be used.
privateKey PrivatKey null The private key used to sign the exchange's payload.
publicKey PublicKey null The public key used to verify the signature of the exchange's payload.
secureRandom secureRandom null A reference to a SecureRandom object that wil lbe used to initialize the Signature service.
password char[] null The password for the keystore.
clearHeaders String true Remove camel crypto headers from Message after a verify operation (value can be "true"/{{"false"}}).

1) Raw keys

The most basic way to way to sign and verify an exchange is with a KeyPair as follows.
from("direct:keypair").to("crypto:sign://basic?privateKey=#myPrivateKey", "crypto:verify://basic?publicKey=#myPublicKey", "mock:result");
Copy to Clipboard Toggle word wrap
The same can be achieved with the Spring XML Extensions using references to keys
<route>
    <from uri="direct:keypair"/>
    <to uri="crypto:sign://basic?privateKey=#myPrivateKey" />
    <to uri="crypto:verify://basic?publicKey=#myPublicKey" />
    <to uri="mock:result"/>
</route>
Copy to Clipboard Toggle word wrap

2) KeyStores and Aliases.

The JCE provides a very versatile KeyStore for housing pairs of PrivateKeys and Certificates keeping them encrypted and password protected. They can be retrieved from it by applying an alias to the retrieval apis. There are a number of ways to get keys and Certificates into a keystore most often this is done with the external 'keytool' application. This is a good example of using keytool to create a KeyStore with a self signed Cert and Private key.
The examples use a Keystore with a key and cert aliased by 'bob'. The password for the keystore and the key is 'letmein'
The following shows how to use a Keystore via the Fluent builders, it also shows how to load and initialize the keystore.
from("direct:keystore").to("crypto:sign://keystore?keystore=#keystore&alias=bob&password=letmein", "crypto:verify://keystore?keystore=#keystore&alias=bob", "mock:result");
Copy to Clipboard Toggle word wrap
Again in Spring a ref is used to lookup an actual keystore instance.
<route>
    <from uri="direct:keystore"/>
    <to uri="crypto:sign://keystore?keystore=#keystore&lias=bob&assword=letmein" />
    <to uri="crypto:verify://keystore?keystore=#keystore&lias=bob" />
    <to uri="mock:result"/>
</route>
Copy to Clipboard Toggle word wrap

3) Changing JCE Provider and Algorithm

Changing the Signature algorithm or the Security provider is a simple matter of specifying their names. You will need to also use Keys that are compatible with the algorithm you choose.
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
keyGen.initialize(512, new SecureRandom());
keyPair = keyGen.generateKeyPair();
PrivateKey privateKey = keyPair.getPrivate();
PublicKey publicKey = keyPair.getPublic();

// we can set the keys explicitly on the endpoint instances.
context.getEndpoint("crypto:sign://rsa?algorithm=MD5withRSA", DigitalSignatureEndpoint.class).setPrivateKey(privateKey);
context.getEndpoint("crypto:verify://rsa?algorithm=MD5withRSA", DigitalSignatureEndpoint.class).setPublicKey(publicKey);
from("direct:algorithm").to("crypto:sign://rsa?algorithm=MD5withRSA", "crypto:verify://rsa?algorithm=MD5withRSA", "mock:result");
Copy to Clipboard Toggle word wrap
from("direct:provider").to("crypto:sign://provider?privateKey=#myPrivateKey&provider=SUN", "crypto:verify://provider?publicKey=#myPublicKey&provider=SUN", "mock:result");
Copy to Clipboard Toggle word wrap
or
<route>
    <from uri="direct:algorithm"/>
    <to uri="crypto:sign://rsa?algorithm=MD5withRSA&rivateKey=#rsaPrivateKey" />
    <to uri="crypto:verify://rsa?algorithm=MD5withRSA&ublicKey=#rsaPublicKey" />
    <to uri="mock:result"/>
</route>
Copy to Clipboard Toggle word wrap
<route>
    <from uri="direct:provider"/>
    <to uri="crypto:sign://provider?privateKey=#myPrivateKey&rovider=SUN" />
    <to uri="crypto:verify://provider?publicKey=#myPublicKey&rovider=SUN" />
    <to uri="mock:result"/>
</route>
Copy to Clipboard Toggle word wrap

4) Changing the Signature Mesasge Header

It may be desirable to change the message header used to store the signature. A different header name can be specified in the route definition as follows
from("direct:signature-header").to("crypto:sign://another?privateKey=#myPrivateKey&signatureHeader=AnotherDigitalSignature",
                                   "crypto:verify://another?publicKey=#myPublicKey&signatureHeader=AnotherDigitalSignature", "mock:result");
Copy to Clipboard Toggle word wrap
or
<route>
    <from uri="direct:signature-header"/>
    <to uri="crypto:sign://another?privateKey=#myPrivateKey&ignatureHeader=AnotherDigitalSignature" />
    <to uri="crypto:verify://another?publicKey=#myPublicKey&ignatureHeader=AnotherDigitalSignature" />
    <to uri="mock:result"/>
</route>
Copy to Clipboard Toggle word wrap

5) Changing the buffersize

In case you need to update the size of the buffer...
from("direct:buffersize").to("crypto:sign://buffer?privateKey=#myPrivateKey&buffersize=1024", "crypto:verify://buffer?publicKey=#myPublicKey&buffersize=1024", "mock:result");
Copy to Clipboard Toggle word wrap
or
<route>
    <from uri="direct:buffersize" />
    <to uri="crypto:sign://buffer?privateKey=#myPrivateKey&uffersize=1024" />
    <to uri="crypto:verify://buffer?publicKey=#myPublicKey&uffersize=1024" />
    <to uri="mock:result"/>
</route>
Copy to Clipboard Toggle word wrap

6) Supplying Keys dynamically.

When using a Recipient list or similar EIP the recipient of an exchange can vary dynamically. Using the same key across all recipients may neither be feasible or desirable. It would be useful to be able to specify the signature keys dynamically on a per exchange basis. The exchange could then be dynamically enriched with the key of its target recipient prior to signing. To facilitate this the signature mechanisms allow for keys to be supplied dynamically via the message headers below
  • Exchange.SIGNATURE_PRIVATE_KEY, "CamelSignaturePrivateKey"
  • Exchange.SIGNATURE_PUBLIC_KEY_OR_CERT, "CamelSignaturePublicKeyOrCert"
from("direct:headerkey-sign").to("crypto:sign://alias");
from("direct:headerkey-verify").to("crypto:verify://alias", "mock:result");
Copy to Clipboard Toggle word wrap
or
<route>
    <from uri="direct:headerkey-sign"/>
    <to uri="crypto:sign://headerkey" />
</route>       
<route>
    <from uri="direct:headerkey-verify"/>
    <to uri="crypto:verify://headerkey" />
    <to uri="mock:result"/>
</route>
Copy to Clipboard Toggle word wrap
Better again would be to dynamically supply a keystore alias. Again the alias can be supplied in a message header
  • Exchange.KEYSTORE_ALIAS, "CamelSignatureKeyStoreAlias"
from("direct:alias-sign").to("crypto:sign://alias?keystore=#keystore");
from("direct:alias-verify").to("crypto:verify://alias?keystore=#keystore", "mock:result");
Copy to Clipboard Toggle word wrap
or
<route>
    <from uri="direct:alias-sign"/>
    <to uri="crypto:sign://alias?keystore=#keystore" />
</route>       
<route>
    <from uri="direct:alias-verify"/>
    <to uri="crypto:verify://alias?keystore=#keystore" />
    <to uri="mock:result"/>
</route>
Copy to Clipboard Toggle word wrap
The header would be set as follows
Exchange unsigned = getMandatoryEndpoint("direct:alias-sign").createExchange();
unsigned.getIn().setBody(payload);
unsigned.getIn().setHeader(DigitalSignatureConstants.KEYSTORE_ALIAS, "bob");
unsigned.getIn().setHeader(DigitalSignatureConstants.KEYSTORE_PASSWORD, "letmein".toCharArray());
template.send("direct:alias-sign", unsigned);
Exchange signed = getMandatoryEndpoint("direct:alias-sign").createExchange();
signed.getIn().copyFrom(unsigned.getOut());
signed.getIn().setHeader(KEYSTORE_ALIAS, "bob");
template.send("direct:alias-verify", signed);
Copy to Clipboard Toggle word wrap
See also:

Chapter 26. CXF

CXF Component

The cxf: component provides integration with Apache CXF for connecting to JAX-WS services hosted in CXF.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-cxf</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap
Note
If you want to learn about CXF dependencies, see the WHICH-JARS text file.
Note
When using CXF as a consumer, the CAMEL:CXF Bean Component allows you to factor out how message payloads are received from their processing as a RESTful or SOAP web service. This has the potential of using a multitude of transports to consume web services. The bean component's configuration is also simpler and provides the fastest method to implement web services using Camel and CXF.
Note
When using CXF in streaming modes (see DataFormat option), then also read about Stream caching.

URI format

cxf:bean:cxfEndpoint[?options]
Copy to Clipboard Toggle word wrap
Where cxfEndpoint represents a bean ID that references a bean in the Spring bean registry. With this URI format, most of the endpoint details are specified in the bean definition.
cxf://someAddress[?options]
Copy to Clipboard Toggle word wrap
Where someAddress specifies the CXF endpoint's address. With this URI format, most of the endpoint details are specified using options.
For either style above, you can append options to the URI as follows:
cxf:bean:cxfEndpoint?wsdlURL=wsdl/hello_world.wsdl&dataFormat=PAYLOAD
Copy to Clipboard Toggle word wrap

Options

Expand
Name Required Description
wsdlURL No
The location of the WSDL. WSDL is obtained from endpoint address by default. For example:
file://local/wsdl/hello.wsdl or wsdl/hello.wsdl
serviceClass Yes
The name of the SEI (Service Endpoint Interface) class. This class can have, but does not require, JSR181 annotations.  Since 2.0, this option is only required by POJO mode. If the wsdlURL option is provided, serviceClass is not required for PAYLOAD and MESSAGE mode. When wsdlURL option is used without serviceClass, the serviceName and portName (endpointName for Spring configuration) options MUST be provided.
Since 2.0, it is possible to use # notation to reference a serviceClass object instance from the registry..
Please be advised that the referenced object cannot be a Proxy (Spring AOP Proxy is OK) as it relies on Object.getClass().getName() method for non Spring AOP Proxy.
Since 2.8, it is possible to omit both wsdlURL and serviceClass options for PAYLOAD and MESSAGE mode. When they are omitted, arbitrary XML elements can be put in CxfPayload's body in PAYLOAD mode to facilitate CXF Dispatch Mode.
For example: org.apache.camel.Hello
serviceName Only if more than one serviceName present in WSDL
The service name this service is implementing, it maps to the wsdl:service@name. For example:
{http://org.apache.camel}ServiceName
endpointName Only if more than one portName under the serviceName is present, and it is required for camel-cxf consumer since camel 2.2
The port name this service is implementing, it maps to the wsdl:port@name. For example:
{http://org.apache.camel}PortName
dataFormat No Which message data format the CXF endpoint supports. Possible values are: POJO (default), PAYLOAD, MESSAGE.
relayHeaders No Please see the Description ofrelayHeadersoption section for this option. Should a CXF endpoint relay headers along the route. Currently only available when dataFormat=POJODefault: trueExample: true, false
wrapped No Which kind of operation the CXF endpoint producer will invoke. Possible values are: true, false (default).
wrappedStyle No Since 2.5.0 The WSDL style that describes how parameters are represented in the SOAP body. If the value is false, CXF will chose the document-literal unwrapped style, If the value is true, CXF will chose the document-literal wrapped style
setDefaultBus No Specifies whether or not to use the default CXF bus for this endpoint. Possible values are: true, false (default).
bus No
Use # notation to reference a bus object from the registry—for example, bus=#busName. The referenced object must be an instance of org.apache.cxf.Bus.
By default, uses the default bus created by CXF Bus Factory.
cxfBinding No
Use # notation to reference a CXF binding object from the registry—for example, cxfBinding=#bindingName. The referenced object must be an instance of org.apache.camel.component.cxf.CxfBinding.
headerFilterStrategy No Use # notation to reference a header filter strategy object from the registry—for example, headerFilterStrategy=#strategyName. The referenced object must be an instance of org.apache.camel.spi.HeaderFilterStrategy.
loggingFeatureEnabled No New in 2.3, this option enables CXF Logging Feature which writes inbound and outbound SOAP messages to log. Possible values are: true, false (default).
defaultOperationName No
New in 2.4, this option will set the default operationName that will be used by the CxfProducer that invokes the remote service. For example:
defaultOperationName=greetMe
defaultOperationNamespace No
New in 2.4, this option will set the default operationNamespace that will be used by the CxfProducer which invokes the remote service. For example:
defaultOperationNamespace= http://apache.org/hello_world_soap_http
synchronous No New in 2.5, this option will let CXF endpoint decide to use sync or async API to do the underlying work. The default value is false, which means camel-cxf endpoint will try to use async API by default.
publishedEndpointUrl No
New in 2.5, this option overrides the endpoint URL that appears in the published WSDL that is accessed using the service address URL plus ?wsdl. For example:
publshedEndpointUrl=http://example.com/service
properties.propName No Camel 2.8: Allows you to set custom CXF properties in the endpoint URI. For example, setting properties.mtom-enabled=true to enable MTOM. To make sure that CXF does not switch the thread when starting the invocation, you can set properties.org.apache.cxf.interceptor.OneWayProcessorInterceptor.USE_ORIGINAL_THREAD=true.
allowStreaming No New in 2.8.2. This option controls whether the CXF component, when running in PAYLOAD mode (see below), will DOM parse the incoming messages into DOM Elements or keep the payload as a javax.xml.transform.Source object that would allow streaming in some cases.
skipFaultLogging No New in 2.11. This option controls whether the PhaseInterceptorChain skips logging the Fault that it catches.
cxfEndpointConfigurer
No
New in Camel 2.11. This option could apply the implementation of org.apache.camel.component.cxf.CxfEndpointConfigurer which supports to configure the CXF endpoint in programmatic way. Since Camel 2.15.0, user can configure the CXF server and client by implementing configure{Server|Client} method of CxfEndpointConfigurer.
username
No
New in Camel 2.12.3 This option is used to set the basic authentication information of username for the CXF client.
password
No
New in Camel 2.12.3 This option is used to set the basic authentication information of password for the CXF client.
continuationTimeout
No
New in Camel 2.14.0 This option is used to set the CXF continuation timeout which could be used in CxfConsumer by default when the CXF server is using Jetty or Servlet transport. (Before Camel 2.14.0, CxfConsumer just set the continuation timeout to be 0, which means the continuation suspend operation never timeout.)
Default: 30000 Example: continuation=80000
The serviceName and portName are QNames, so if you provide them be sure to prefix them with their {namespace} as shown in the examples above.

The descriptions of the dataformats

Expand
DataFormat Description
POJO POJOs (plain old Java objects) are the Java parameters to the method being invoked on the target server. Both Protocol and Logical JAX-WS handlers are supported.
PAYLOAD PAYLOAD is the message payload (the contents of the soap:body) after message configuration in the CXF endpoint is applied. Only Protocol JAX-WS handler is supported. Logical JAX-WS handler is not supported.
MESSAGE MESSAGE is the raw message that is received from the transport layer. It is not suppose to touch or change Stream, some of the CXF interceptors will be removed if you are using this kind of DataFormat so you can't see any soap headers after the camel-cxf consumer and JAX-WS handler is not supported.
CXF_MESSAGE New in Camel 2.8.2, CXF_MESSAGE allows for invoking the full capabilities of CXF interceptors by converting the message from the transport layer into a raw SOAP message
You can determine the data format mode of an exchange by retrieving the exchange property, CamelCXFDataFormat. The exchange key constant is defined in org.apache.camel.component.cxf.CxfConstants.DATA_FORMAT_PROPERTY.
Since Camel 2.8, there is support for using Aries blueprint dependency injection for your CXF endpoints. The schema is very similar to the Spring schema, so the transition is fairly transparent.
For example:
 <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.0.0"
            xmlns:camel-cxf="http://camel.apache.org/schema/blueprint/cxf"
 	   xmlns:cxfcore="http://cxf.apache.org/blueprint/core"
            xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0 http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd">
 
       <camel-cxf:cxfEndpoint id="routerEndpoint"
                      address="http://localhost:9001/router"
                      serviceClass="org.apache.servicemix.examples.cxf.HelloWorld">
         <camel-cxf:properties>
             <entry key="dataFormat" value="MESSAGE"/>
         </camel-cxf:properties>
      </camel-cxf:cxfEndpoint>
 
      <camel-cxf:cxfEndpoint id="serviceEndpoint"
			address="http://localhost:9000/SoapContext/SoapPort"
                     serviceClass="org.apache.servicemix.examples.cxf.HelloWorld">
    </camel-cxf:cxfEndpoint>

    <camelContext xmlns="http://camel.apache.org/schema/blueprint">
        <route>
            <from uri="routerEndpoint"/>
            <to uri="log:request"/>
        </route>
    </camelContext>

</blueprint>


Copy to Clipboard Toggle word wrap
Currently the endpoint element is the first supported CXF namespacehandler.
You can also use the bean references just as in spring
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.0.0"
           xmlns:jaxws="http://cxf.apache.org/blueprint/jaxws"
           xmlns:cxf="http://cxf.apache.org/blueprint/core"
           xmlns:camel="http://camel.apache.org/schema/blueprint"
           xmlns:camelcxf="http://camel.apache.org/schema/blueprint/cxf"
           xsi:schemaLocation="
             http://www.osgi.org/xmlns/blueprint/v1.0.0 http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd
             http://cxf.apache.org/blueprint/jaxws http://cxf.apache.org/schemas/blueprint/jaxws.xsd
             http://cxf.apache.org/blueprint/core http://cxf.apache.org/schemas/blueprint/core.xsd
             ">

    <camelcxf:cxfEndpoint id="reportIncident"
                     address="/camel-example-cxf-blueprint/webservices/incident"
                     wsdlURL="META-INF/wsdl/report_incident.wsdl"
                     serviceClass="org.apache.camel.example.reportincident.ReportIncidentEndpoint">
    </camelcxf:cxfEndpoint>

    <bean id="reportIncidentRoutes" class="org.apache.camel.example.reportincident.ReportIncidentRoutes" />

    <camelContext xmlns="http://camel.apache.org/schema/blueprint">
        <routeBuilder ref="reportIncidentRoutes"/>
    </camelContext>

</blueprint>


Copy to Clipboard Toggle word wrap
CXF's LoggingOutInterceptor outputs outbound message that goes on the wire to logging system (java.util.logging). Since the LoggingOutInterceptor is in PRE_STREAM phase (but PRE_STREAM phase is removed in MESSAGE mode), you have to configure LoggingOutInterceptor to be run during the WRITE phase. The following is an example.
   <bean id="loggingOutInterceptor" class="org.apache.cxf.interceptor.LoggingOutInterceptor">
        <!--  it really should have been user-prestream but CXF does have such phase! -->
        <constructor-arg value="target/write"/> 
   </bean>
   		
<cxf:cxfEndpoint id="serviceEndpoint" address="http://localhost:9002/helloworld"
	serviceClass="org.apache.camel.component.cxf.HelloService">
	<cxf:outInterceptors>
	    <ref bean="loggingOutInterceptor"/>
	</cxf:outInterceptors>
	<cxf:properties>
		<entry key="dataFormat" value="MESSAGE"/>
	</cxf:properties>
</cxf:cxfEndpoint>
Copy to Clipboard Toggle word wrap

Description of relayHeaders option

There are in-band and out-of-band on-the-wire headers from the perspective of a JAXWS WSDL-first developer.
The in-band headers are headers that are explicitly defined as part of the WSDL binding contract for an endpoint such as SOAP headers.
The out-of-band headers are headers that are serialized over the wire, but are not explicitly part of the WSDL binding contract.
Headers relaying/filtering is bi-directional.
When a route has a CXF endpoint and the developer needs to have on-the-wire headers, such as SOAP headers, be relayed along the route to be consumed say by another JAXWS endpoint, then relayHeaders should be set to true, which is the default value.

Available only in POJO mode

The relayHeaders=true setting expresses an intent to relay the headers. The actual decision on whether a given header is relayed is delegated to a pluggable instance that implements the MessageHeadersRelay interface. A concrete implementation of MessageHeadersRelay will be consulted to decide if a header needs to be relayed or not. There is already an implementation of SoapMessageHeadersRelay which binds itself to well-known SOAP name spaces. Currently only out-of-band headers are filtered, and in-band headers will always be relayed when relayHeaders=true. If there is a header on the wire, whose name space is unknown to the runtime, then a fall back DefaultMessageHeadersRelay will be used, which simply allows all headers to be relayed.
The relayHeaders=false setting asserts that all headers, in-band and out-of-band, will be dropped.
You can plugin your own MessageHeadersRelay implementations overriding or adding additional ones to the list of relays. In order to override a preloaded relay instance just make sure that your MessageHeadersRelay implementation services the same name spaces as the one you looking to override. Also note, that the overriding relay has to service all of the name spaces as the one you looking to override, or else a runtime exception on route start up will be thrown as this would introduce an ambiguity in name spaces to relay instance mappings.
<cxf:cxfEndpoint ...>
   <cxf:properties>
     <entry key="org.apache.camel.cxf.message.headers.relays">
       <list>
         <ref bean="customHeadersRelay"/>
       </list>
     </entry>
   </cxf:properties>
 </cxf:cxfEndpoint>
 <bean id="customHeadersRelay" class="org.apache.camel.component.cxf.soap.headers.CustomHeadersRelay"/>
Copy to Clipboard Toggle word wrap
Take a look at the tests that show how you'd be able to relay/drop headers here:

Changes since Release 2.0

  • POJO and PAYLOAD modes are supported. In POJO mode, only out-of-band message headers are available for filtering as the in-band headers have been processed and removed from the header list by CXF. The in-band headers are incorporated into the MessageContentList in POJO mode. The camel-cxf component does make any attempt to remove the in-band headers from the MessageContentList If filtering of in-band headers is required, please use PAYLOAD mode or plug in a (pretty straightforward) CXF interceptor/JAXWS Handler to the CXF endpoint.
  • The Message Header Relay mechanism has been merged into CxfHeaderFilterStrategy. The relayHeaders option, its semantics, and default value remain the same, but it is a property of CxfHeaderFilterStrategy. Here is an example of configuring it.
    <bean id="dropAllMessageHeadersStrategy" class="org.apache.camel.component.cxf.common.header.CxfHeaderFilterStrategy">
    
        <!--  Set relayHeaders to false to drop all SOAP headers -->
        <property name="relayHeaders" value="false"/>
        
    </bean>
    
    Copy to Clipboard Toggle word wrap
    Then, your endpoint can reference the CxfHeaderFilterStrategy.
    <route>
        <from uri="cxf:bean:routerNoRelayEndpoint?headerFilterStrategy=#dropAllMessageHeadersStrategy"/>          
        <to uri="cxf:bean:serviceNoRelayEndpoint?headerFilterStrategy=#dropAllMessageHeadersStrategy"/>
    </route>
    
    Copy to Clipboard Toggle word wrap
  • The MessageHeadersRelay interface has changed slightly and has been renamed to MessageHeaderFilter. It is a property of CxfHeaderFilterStrategy. Here is an example of configuring user defined Message Header Filters:
    <bean id="customMessageFilterStrategy" class="org.apache.camel.component.cxf.common.header.CxfHeaderFilterStrategy">
        <property name="messageHeaderFilters">
            <list>
                <!--  SoapMessageHeaderFilter is the built in filter.  It can be removed by omitting it. -->
                <bean class="org.apache.camel.component.cxf.common.header.SoapMessageHeaderFilter"/>
                
                <!--  Add custom filter here -->    
                <bean class="org.apache.camel.component.cxf.soap.headers.CustomHeaderFilter"/>
            </list>
        </property>
    </bean>
    
    Copy to Clipboard Toggle word wrap
  • Other than relayHeaders, there are new properties that can be configured in CxfHeaderFilterStrategy.
Expand
Name Description type Required? Default value
relayHeaders All message headers will be processed by Message Header Filters boolean No true (1.6.1 behavior)
relayAllMessageHeaders All message headers will be propagated (without processing by Message Header Filters) boolean No false (1.6.1 behavior)
allowFilterNamespaceClash If two filters overlap in activation namespace, the property control how it should be handled. If the value is true, last one wins. If the value is false, it will throw an exception boolean No false (1.6.1 behavior)

Configure the CXF endpoints with Spring

You can configure the CXF endpoint with the Spring configuration file shown below, and you can also embed the endpoint into the camelContext tags. When you are invoking the service endpoint, you can set the operationName and operationNamespace headers to explicitly state which operation you are calling.
NOTE In Camel 2.x we change to use http://camel.apache.org/schema/cxf as the CXF endpoint's target namespace.
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:cxf="http://camel.apache.org/schema/cxf"
        xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
        http://camel.apache.org/schema/cxf http://camel.apache.org/schema/cxf/camel-cxf.xsd
        http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd     ">
 ...

Copy to Clipboard Toggle word wrap
Note
In Apache Camel 2.x, the http://activemq.apache.org/camel/schema/cxfEndpoint namespace was changed to http://camel.apache.org/schema/cxf.
Be sure to include the JAX-WS schemaLocation attribute specified on the root beans element. This allows CXF to validate the file and is required. Also note the namespace declarations at the end of the <cxf:cxfEndpoint/> tag--these are required because the combined {namespace}localName syntax is presently not supported for this tag's attribute values.
The cxf:cxfEndpoint element supports many additional attributes:
Expand
Name Value
PortName The endpoint name this service is implementing, it maps to the wsdl:port@name. In the format of ns:PORT_NAME where ns is a namespace prefix valid at this scope.
serviceName The service name this service is implementing, it maps to the wsdl:service@name. In the format of ns:SERVICE_NAME where ns is a namespace prefix valid at this scope.
wsdlURL The location of the WSDL. Can be on the classpath, file system, or be hosted remotely.
bindingId The bindingId for the service model to use.
address The service publish address.
bus The bus name that will be used in the JAX-WS endpoint.
serviceClass The class name of the SEI (Service Endpoint Interface) class which could have JSR181 annotation or not.
It also supports many child elements:
Expand
Name Value
cxf:inInterceptors The incoming interceptors for this endpoint. A list of <bean> or <ref>.
cxf:inFaultInterceptors The incoming fault interceptors for this endpoint. A list of <bean> or <ref>.
cxf:outInterceptors The outgoing interceptors for this endpoint. A list of <bean> or <ref>.
cxf:outFaultInterceptors The outgoing fault interceptors for this endpoint. A list of <bean> or <ref>.
cxf:properties A properties map which should be supplied to the JAX-WS endpoint. See below.
cxf:handlers A JAX-WS handler list which should be supplied to the JAX-WS endpoint. See below.
cxf:dataBinding You can specify the which DataBinding will be use in the endpoint. This can be supplied using the Spring <bean class="MyDataBinding"/> syntax.
cxf:binding You can specify the BindingFactory for this endpoint to use. This can be supplied using the Spring <bean class="MyBindingFactory"/> syntax.
cxf:features The features that hold the interceptors for this endpoint. A list of <bean>s or <ref>s
cxf:schemaLocations The schema locations for endpoint to use. A list of <schemaLocation>s
cxf:serviceFactory The service factory for this endpoint to use. This can be supplied using the Spring <bean class="MyServiceFactory"/> syntax
You can find more advanced examples which show how to provide interceptors, properties and handlers here: http://cxf.apache.org/docs/jax-ws-configuration.html
Note
You can use CXF:properties to set the CXF endpoint's dataFormat and setDefaultBus properties from a Spring configuration file, as follows:
<cxf:cxfEndpoint id="testEndpoint" address="http://localhost:9000/router"
     serviceClass="org.apache.camel.component.cxf.HelloService"
     endpointName="s:PortName"
     serviceName="s:ServiceName"
     xmlns:s="http://www.example.com/test">
     <cxf:properties>
       <entry key="dataFormat" value="MESSAGE"/>
       <entry key="setDefaultBus" value="true"/>
     </cxf:properties>
   </cxf:cxfEndpoint>
Copy to Clipboard Toggle word wrap
CXF's default logger is java.util.logging. If you want to change it to log4j, proceed as follows. Create a file, in the classpath, named META-INF/cxf/org.apache.cxf.logger. This file should contain the fully-qualified name of the class, org.apache.cxf.common.logging.Log4jLogger, with no comments, on a single line.
If you are using some SOAP client such as PHP, you will get this kind of error, because CXF doesn't add the XML start document <?xml version="1.0" encoding="utf-8"?>.
Error:sendSms: SoapFault exception: [Client] looks like we got no XML document in [...]
Copy to Clipboard Toggle word wrap
To resolved this issue, you just need to tell StaxOutInterceptor to write the XML start document for you.
public class WriteXmlDeclarationInterceptor extends AbstractPhaseInterceptor<SoapMessage> {
    public WriteXmlDeclarationInterceptor() {
        super(Phase.PRE_STREAM);
        addBefore(StaxOutInterceptor.class.getName());
    }

    public void handleMessage(SoapMessage message) throws Fault {
        message.put("org.apache.cxf.stax.force-start-document", Boolean.TRUE);        
    }

}
Copy to Clipboard Toggle word wrap
You can add a customer interceptor like this and configure it into you camel-cxf endpont
<cxf:cxfEndpoint id="routerEndpoint" address="http://localhost:${CXFTestSupport.port2}/CXFGreeterRouterTest/CamelContext/RouterPort"
 		serviceClass="org.apache.hello_world_soap_http.GreeterImpl"
 		skipFaultLogging="true">
     <cxf:outInterceptors>
         <!-- This interceptor will force the CXF server send the XML start document to client -->
         <bean class="org.apache.camel.component.cxf.WriteXmlDeclarationInterceptor"/>
     </cxf:outInterceptors>
     <cxf:properties>
         <!-- Set the publishedEndpointUrl which could override the service address from generated WSDL as you want -->
         <entry key="publishedEndpointUrl" value="http://www.simple.com/services/test" />
     </cxf:properties>
 </cxf:cxfEndpoint>
Copy to Clipboard Toggle word wrap
Or adding a message header for it like this if you are using Camel 2.4.
 // set up the response context which force start document
 Map<String, Object> map = new HashMap<String, Object>();
 map.put("org.apache.cxf.stax.force-start-document", Boolean.TRUE);
 exchange.getOut().setHeader(Client.RESPONSE_CONTEXT, map);
Copy to Clipboard Toggle word wrap
The camel-cxf endpoint consumer POJO data format is based on the cxf invoker, so the message header has a property with the name of CxfConstants.OPERATION_NAME and the message body is a list of the SEI method parameters.
public class PersonProcessor implements Processor {

    private static final transient Logger LOG = LoggerFactory.getLogger(PersonProcessor.class);

    @SuppressWarnings("unchecked")
    public void process(Exchange exchange) throws Exception {
        LOG.info("processing exchange in camel");

        BindingOperationInfo boi = (BindingOperationInfo)exchange.getProperty(BindingOperationInfo.class.toString());
        if (boi != null) {
            LOG.info("boi.isUnwrapped" + boi.isUnwrapped());
        }
        // Get the parameters list which element is the holder.
        MessageContentsList msgList = (MessageContentsList)exchange.getIn().getBody();
        Holder<String> personId = (Holder<String>)msgList.get(0);
        Holder<String> ssn = (Holder<String>)msgList.get(1);
        Holder<String> name = (Holder<String>)msgList.get(2);

        if (personId.value == null || personId.value.length() == 0) {
            LOG.info("person id 123, so throwing exception");
            // Try to throw out the soap fault message
            org.apache.camel.wsdl_first.types.UnknownPersonFault personFault =
                new org.apache.camel.wsdl_first.types.UnknownPersonFault();
            personFault.setPersonId("");
            org.apache.camel.wsdl_first.UnknownPersonFault fault =
                new org.apache.camel.wsdl_first.UnknownPersonFault("Get the null value of person name", personFault);
            // Since camel has its own exception handler framework, we can't throw the exception to trigger it
            // We just set the fault message in the exchange for camel-cxf component handling and return
            exchange.getOut().setFault(true);
            exchange.getOut().setBody(fault);
            return;
        }

        name.value = "Bonjour";
        ssn.value = "123";
        LOG.info("setting Bonjour as the response");
        // Set the response message, first element is the return value of the operation,
        // the others are the holders of method parameters
        exchange.getOut().setBody(new Object[] {null, personId, ssn, name});
    }

}
Copy to Clipboard Toggle word wrap
The camel-cxf endpoint producer is based on the cxf client API. First you need to specify the operation name in the message header, then add the method parameters to a list, and initialize the message with this parameter list. The response message's body is a messageContentsList, you can get the result from that list.
If you don't specify the operation name in the message header, CxfProducer will try to use the defaultOperationName from CxfEndpoint. If there is no defaultOperationName set on CxfEndpoint, it will pick up the first operation name from the operation list.
If you want to get the object array from the message body, you can get the body using message.getbody(Object[].class), as follows:
Exchange senderExchange = new DefaultExchange(context, ExchangePattern.InOut);
final List<String> params = new ArrayList<String>();
// Prepare the request message for the camel-cxf procedure
params.add(TEST_MESSAGE);
senderExchange.getIn().setBody(params);
senderExchange.getIn().setHeader(CxfConstants.OPERATION_NAME, ECHO_OPERATION);

Exchange exchange = template.send("direct:EndpointA", senderExchange);

org.apache.camel.Message out = exchange.getOut();
// The response message's body is an MessageContentsList which first element is the return value of the operation,
// If there are some holder parameters, the holder parameter will be filled in the reset of List.
// The result will be extract from the MessageContentsList with the String class type
MessageContentsList result = (MessageContentsList)out.getBody();
LOG.info("Received output text: " + result.get(0));
Map<String, Object> responseContext = CastUtils.cast((Map<?, ?>)out.getHeader(Client.RESPONSE_CONTEXT));
assertNotNull(responseContext);
assertEquals("We should get the response context here", "UTF-8", responseContext.get(org.apache.cxf.message.Message.ENCODING));
assertEquals("Reply body on Camel is wrong", "echo " + TEST_MESSAGE, result.get(0));
Copy to Clipboard Toggle word wrap
In Apache Camel 2.0: CxfMessage.getBody() will return an org.apache.camel.component.cxf.CxfPayload object, which has getters for SOAP message headers and Body elements. This change enables decoupling the native CXF message from the Apache Camel message.
protected RouteBuilder createRouteBuilder() {
    return new RouteBuilder() {
        public void configure() {
            from(SIMPLE_ENDPOINT_URI + "&dataFormat=PAYLOAD").to("log:info").process(new Processor() {
                @SuppressWarnings("unchecked")
                public void process(final Exchange exchange) throws Exception {                        
                    CxfPayload<SoapHeader> requestPayload = exchange.getIn().getBody(CxfPayload.class);
                    List<Source> inElements = requestPayload.getBodySources();
                    List<Source> outElements = new ArrayList<Source>();
                    // You can use a customer toStringConverter to turn a CxfPayLoad message into String as you want                        
                    String request = exchange.getIn().getBody(String.class);
                    XmlConverter converter = new XmlConverter();
                    String documentString = ECHO_RESPONSE;
                    
                    Element in = new XmlConverter().toDOMElement(inElements.get(0));
                    // Just check the element namespace
                    if (!in.getNamespaceURI().equals(ELEMENT_NAMESPACE)) {
                        throw new IllegalArgumentException("Wrong element namespace");
                    }
                    if (in.getLocalName().equals("echoBoolean")) {
                        documentString = ECHO_BOOLEAN_RESPONSE;
                        checkRequest("ECHO_BOOLEAN_REQUEST", request);
                    } else {
                        documentString = ECHO_RESPONSE;
                        checkRequest("ECHO_REQUEST", request);
                    }
                    Document outDocument = converter.toDOMDocument(documentString);
                    outElements.add(new DOMSource(outDocument.getDocumentElement()));
                    // set the payload header with null
                    CxfPayload<SoapHeader> responsePayload = new CxfPayload<SoapHeader>(null, outElements, null);
                    exchange.getOut().setBody(responsePayload); 
                }
            });
        }
    };
}
Copy to Clipboard Toggle word wrap

How to get and set SOAP headers in POJO mode

POJO means that the data format is a list of Java objects when the CXF endpoint produces or consumes Camel exchanges. Even though Apache Camel exposes the message body as POJOs in this mode, the CXF component still provides access to read and write SOAP headers. However, since CXF interceptors remove in-band SOAP headers from the header list after they have been processed, only out-of-band SOAP headers are available in POJO mode.
The following example illustrates how to get/set SOAP headers. Suppose we have a route that forwards from one CXF endpoint to another. That is, SOAP Client -> Apache Camel -> CXF service. We can attach two processors to obtain/insert SOAP headers at (1) before request goes out to the CXF service and (2) before response comes back to the SOAP Client. Processor (1) and (2) in this example are InsertRequestOutHeaderProcessor and InsertResponseOutHeaderProcessor. Our route looks like this:
<route>
    <from uri="cxf:bean:routerRelayEndpointWithInsertion"/>
    <process ref="InsertRequestOutHeaderProcessor" />
    <to uri="cxf:bean:serviceRelayEndpointWithInsertion"/>
    <process ref="InsertResponseOutHeaderProcessor" />
</route>
Copy to Clipboard Toggle word wrap
In 2.x SOAP headers are propagated to and from Apache Camel Message headers. The Apache Camel message header name is org.apache.cxf.headers.Header.list, which is a constant defined in CXF (org.apache.cxf.headers.Header.HEADER_LIST). The header value is a List<> of CXF SoapHeader objects (org.apache.cxf.binding.soap.SoapHeader). The following snippet is the InsertResponseOutHeaderProcessor (that inserts a new SOAP header in the response message). The way to access SOAP headers in both InsertResponseOutHeaderProcessor and InsertRequestOutHeaderProcessor are actually the same. The only difference between the two processors is setting the direction of the inserted SOAP header.
public static class InsertResponseOutHeaderProcessor implements Processor {

    @SuppressWarnings("unchecked")
    public void process(Exchange exchange) throws Exception {
        // You should be able to get the header if exchange is routed from camel-cxf endpoint
        List<SoapHeader> soapHeaders = CastUtils.cast((List<?>)exchange.getIn().getHeader(Header.HEADER_LIST));
        if (soapHeaders == null) {
            // we just create a new soap headers in case the header is null
            soapHeaders = new ArrayList<SoapHeader>();
        }

        // Insert a new header
        String xml = "<?xml version=\"1.0\" encoding=\"utf-8\"?><outofbandHeader "
            + "xmlns=\"http://cxf.apache.org/outofband/Header\" hdrAttribute=\"testHdrAttribute\" "
            + "xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\" soap:mustUnderstand=\"1\">"
            + "<name>New_testOobHeader</name><value>New_testOobHeaderValue</value></outofbandHeader>";
        SoapHeader newHeader = new SoapHeader(soapHeaders.get(0).getName(),
                       DOMUtils.readXml(new StringReader(xml)).getDocumentElement());
        // make sure direction is OUT since it is a response message.
        newHeader.setDirection(Direction.DIRECTION_OUT);
        //newHeader.setMustUnderstand(false);
        soapHeaders.add(newHeader);
        
    }
    
}
Copy to Clipboard Toggle word wrap

How to get and set SOAP headers in PAYLOAD mode

We have already shown how to access SOAP message (CxfPayload object) in PAYLOAD mode (see the section called “How to deal with the message for a camel-cxf endpoint in PAYLOAD data format”).
Once you obtain a CxfPayload object, you can invoke the CxfPayload.getHeaders() method that returns a List of DOM Elements (SOAP headers).
from(getRouterEndpointURI()).process(new Processor() {
    @SuppressWarnings("unchecked")
    public void process(Exchange exchange) throws Exception {
        CxfPayload<SoapHeader> payload = exchange.getIn().getBody(CxfPayload.class);
        List<Source> elements = payload.getBodySources();
        assertNotNull("We should get the elements here", elements);
        assertEquals("Get the wrong elements size", 1, elements.size());
                
        Element el = new XmlConverter().toDOMElement(elements.get(0));
        elements.set(0, new DOMSource(el));
        assertEquals("Get the wrong namespace URI", "http://camel.apache.org/pizza/types", 
                el.getNamespaceURI());
            
        List<SoapHeader> headers = payload.getHeaders();
        assertNotNull("We should get the headers here", headers);
        assertEquals("Get the wrong headers size", headers.size(), 1);
        assertEquals("Get the wrong namespace URI", 
                ((Element)(headers.get(0).getObject())).getNamespaceURI(), 
                "http://camel.apache.org/pizza/types");         
    }
    
})
.to(getServiceEndpointURI());
Copy to Clipboard Toggle word wrap

SOAP headers are not available in MESSAGE mode

SOAP headers are not available in MESSAGE mode as SOAP processing is skipped.

How to throw a SOAP Fault from Apache Camel

If you are using a CXF endpoint to consume the SOAP request, you may need to throw the SOAP Fault from the camel context. Basically, you can use the throwFault DSL to do that; it works for POJO, PAYLOAD and MESSAGE data format. You can define the soap fault like this:
SOAP_FAULT = new SoapFault(EXCEPTION_MESSAGE, SoapFault.FAULT_CODE_CLIENT);
Element detail = SOAP_FAULT.getOrCreateDetail();
Document doc = detail.getOwnerDocument();
Text tn = doc.createTextNode(DETAIL_TEXT);
detail.appendChild(tn);
Copy to Clipboard Toggle word wrap
Then throw it as you like:
from(routerEndpointURI).setFaultBody(constant(SOAP_FAULT));
Copy to Clipboard Toggle word wrap
If your CXF endpoint is working in the MESSAGE data format, you could set the the SOAP Fault message in the message body and set the response code in the message header.
from(routerEndpointURI).process(new Processor() {

    public void process(Exchange exchange) throws Exception {
        Message out = exchange.getOut();
        // Set the message body with the 
        out.setBody(this.getClass().getResourceAsStream("SoapFaultMessage.xml"));
        // Set the response code here
        out.setHeader(org.apache.cxf.message.Message.RESPONSE_CODE, new Integer(500));
    }

});
Copy to Clipboard Toggle word wrap
The same is true for the POJO data format. You can set the SOAP Fault on the Out body and also indicate it's a fault by calling Message.setFault(true), as follows:
from("direct:start").onException(SoapFault.class).maximumRedeliveries(0).handled(true)
    .process(new Processor() {
        public void process(Exchange exchange) throws Exception {
            SoapFault fault = exchange
                .getProperty(Exchange.EXCEPTION_CAUGHT, SoapFault.class);
            exchange.getOut().setFault(true);
            exchange.getOut().setBody(fault);
        }

    }).end().to(serviceURI);
Copy to Clipboard Toggle word wrap
cxf client API provides a way to invoke the operation with request and response context. If you are using a CXF endpoint producer to invoke the external Web service, you can set the request context and get the response context with the following code:
        CxfExchange exchange = (CxfExchange)template.send(getJaxwsEndpointUri(), new Processor() {
             public void process(final Exchange exchange) {
                 final List<String> params = new ArrayList<String>();
                 params.add(TEST_MESSAGE);
                 // Set the request context to the inMessage
                 Map<String, Object> requestContext = new HashMap<String, Object>();
                 requestContext.put(BindingProvider.ENDPOINT_ADDRESS_PROPERTY, JAXWS_SERVER_ADDRESS);
                 exchange.getIn().setBody(params);
                 exchange.getIn().setHeader(Client.REQUEST_CONTEXT , requestContext);
                 exchange.getIn().setHeader(CxfConstants.OPERATION_NAME, GREET_ME_OPERATION);
             }
         });
         org.apache.camel.Message out = exchange.getOut();
         // The output is an object array, the first element of the array is the return value
         Object\[\] output = out.getBody(Object\[\].class);
         LOG.info("Received output text: " + output\[0\]);
         // Get the response context form outMessage
         Map<String, Object> responseContext = CastUtils.cast((Map)out.getHeader(Client.RESPONSE_CONTEXT));
         assertNotNull(responseContext);
         assertEquals("Get the wrong wsdl opertion name", "{http://apache.org/hello_world_soap_http}greetMe",
                      responseContext.get("javax.xml.ws.wsdl.operation").toString());

Copy to Clipboard Toggle word wrap

Attachment Support

POJO Mode: Both SOAP with Attachment and MTOM are supported (see example in Payload Mode for enabling MTOM). However, SOAP with Attachment is not tested. Since attachments are marshalled and unmarshalled into POJOs, users typically do not need to deal with the attachment themself. Attachments are propagated to Camel message's attachments since 2.1. So, it is possible to retreive attachments by Camel Message API
DataHandler Message.getAttachment(String id)
Copy to Clipboard Toggle word wrap
.
Payload Mode: MTOM is supported since 2.1. Attachments can be retrieved by Camel Message APIs mentioned above. SOAP with Attachment is not supported as there is no SOAP processing in this mode.
To enable MTOM, set the CXF endpoint property "mtom_enabled" to true. (I believe you can only do it with Spring.)
<cxf:cxfEndpoint id="routerEndpoint" address="http://localhost:${CXFTestSupport.port1}/CxfMtomRouterPayloadModeTest/jaxws-mtom/hello"
         wsdlURL="mtom.wsdl"
         serviceName="ns:HelloService"
         endpointName="ns:HelloPort"
         xmlns:ns="http://apache.org/camel/cxf/mtom_feature">

     <cxf:properties>
         <!--  enable mtom by setting this property to true -->
         <entry key="mtom-enabled" value="true"/>
         
         <!--  set the camel-cxf endpoint data fromat to PAYLOAD mode -->
         <entry key="dataFormat" value="PAYLOAD"/>
     </cxf:properties>
Copy to Clipboard Toggle word wrap
You can produce a Camel message with attachment to send to a CXF endpoint in Payload mode.
Exchange exchange = context.createProducerTemplate().send("direct:testEndpoint", new Processor() {

    public void process(Exchange exchange) throws Exception {
        exchange.setPattern(ExchangePattern.InOut);
        List&lt;Source> elements = new ArrayList&lt;Source>();
        elements.add(new DOMSource(DOMUtils.readXml(new StringReader(MtomTestHelper.REQ_MESSAGE)).getDocumentElement()));
        CxfPayload<SoapHeader> body = new CxfPayload<SoapHeader>(new ArrayList<SoapHeader>(),
            elements, null);
        exchange.getIn().setBody(body);
        exchange.getIn().addAttachment(MtomTestHelper.REQ_PHOTO_CID, 
            new DataHandler(new ByteArrayDataSource(MtomTestHelper.REQ_PHOTO_DATA, "application/octet-stream")));

        exchange.getIn().addAttachment(MtomTestHelper.REQ_IMAGE_CID, 
            new DataHandler(new ByteArrayDataSource(MtomTestHelper.requestJpeg, "image/jpeg")));

    }
    
});

// process response 

CxfPayload<SoapHeader> out = exchange.getOut().getBody(CxfPayload.class);
Assert.assertEquals(1, out.getBody().size());

Map<String, String> ns = new HashMap<String, String>();
ns.put("ns", MtomTestHelper.SERVICE_TYPES_NS);
ns.put("xop", MtomTestHelper.XOP_NS);

XPathUtils xu = new XPathUtils(ns);
Element oute = new XmlConverter().toDOMElement(out.getBody().get(0));
Element ele = (Element)xu.getValue("//ns:DetailResponse/ns:photo/xop:Include", oute,
                                   XPathConstants.NODE);
String photoId = ele.getAttribute("href").substring(4); // skip "cid:"

ele = (Element)xu.getValue("//ns:DetailResponse/ns:image/xop:Include", oute,
                                   XPathConstants.NODE);
String imageId = ele.getAttribute("href").substring(4); // skip "cid:"

DataHandler dr = exchange.getOut().getAttachment(photoId);
Assert.assertEquals("application/octet-stream", dr.getContentType());
MtomTestHelper.assertEquals(MtomTestHelper.RESP_PHOTO_DATA, IOUtils.readBytesFromStream(dr.getInputStream()));
   
dr = exchange.getOut().getAttachment(imageId);
Assert.assertEquals("image/jpeg", dr.getContentType());

BufferedImage image = ImageIO.read(dr.getInputStream());
Assert.assertEquals(560, image.getWidth());
Assert.assertEquals(300, image.getHeight());
Copy to Clipboard Toggle word wrap
You can also consume a Camel message received from a CXF endpoint in Payload mode.
public static class MyProcessor implements Processor {

    @SuppressWarnings("unchecked")
    public void process(Exchange exchange) throws Exception {
        CxfPayload<SoapHeader> in = exchange.getIn().getBody(CxfPayload.class);
        
        // verify request
        assertEquals(1, in.getBody().size());
        
        Map<String, String> ns = new HashMap<String, String>();
        ns.put("ns", MtomTestHelper.SERVICE_TYPES_NS);
        ns.put("xop", MtomTestHelper.XOP_NS);

        XPathUtils xu = new XPathUtils(ns);
        Element body = new XmlConverter().toDOMElement(in.getBody().get(0));
        Element ele = (Element)xu.getValue("//ns:Detail/ns:photo/xop:Include", body,
                                           XPathConstants.NODE);
        String photoId = ele.getAttribute("href").substring(4); // skip "cid:"
        assertEquals(MtomTestHelper.REQ_PHOTO_CID, photoId);
        
        ele = (Element)xu.getValue("//ns:Detail/ns:image/xop:Include", body,
                                           XPathConstants.NODE);
        String imageId = ele.getAttribute("href").substring(4); // skip "cid:"
        assertEquals(MtomTestHelper.REQ_IMAGE_CID, imageId);

        DataHandler dr = exchange.getIn().getAttachment(photoId);
        assertEquals("application/octet-stream", dr.getContentType());
        MtomTestHelper.assertEquals(MtomTestHelper.REQ_PHOTO_DATA, IOUtils.readBytesFromStream(dr.getInputStream()));
   
        dr = exchange.getIn().getAttachment(imageId);
        assertEquals("image/jpeg", dr.getContentType());
        MtomTestHelper.assertEquals(MtomTestHelper.requestJpeg, IOUtils.readBytesFromStream(dr.getInputStream()));

        // create response
        List&lt;Source> elements = new ArrayList&lt;Source>();
        elements.add(new DOMSource(DOMUtils.readXml(new StringReader(MtomTestHelper.RESP_MESSAGE)).getDocumentElement()));
        CxfPayload&lt;SoapHeader> sbody = new CxfPayload&lt;SoapHeader>(new ArrayList&lt;SoapHeader>(),
            elements, null);
        exchange.getOut().setBody(sbody);
        exchange.getOut().addAttachment(MtomTestHelper.RESP_PHOTO_CID, 
            new DataHandler(new ByteArrayDataSource(MtomTestHelper.RESP_PHOTO_DATA, "application/octet-stream")));

        exchange.getOut().addAttachment(MtomTestHelper.RESP_IMAGE_CID, 
            new DataHandler(new ByteArrayDataSource(MtomTestHelper.responseJpeg, "image/jpeg")));

    }
}
Copy to Clipboard Toggle word wrap
Message Mode: Attachments are not supported as it does not process the message at all.
CXF_MESSAGE Mode: MTOM is supported, and Attachments can be retrieved by Camel Message APIs mentioned above. Note that when receiving a multipart (that is, MTOM) message the default SOAPMessage to String converter will provide the complete multi-part payload on the body. If you require just the SOAP XML as a String, you can set the message body with message.getSOAPPart(), and Camel convert can do the rest of work for you.

How to propagate stack trace information

It is possible to configure a CXF endpoint so that, when a Java exception is thrown on the server side, the stack trace for the exception is marshalled into a fault message and returned to the client. To enable this feaure, set the dataFormat to PAYLOAD and set the faultStackTraceEnabled property to true in the cxfEndpoint element, as follows:
<cxf:cxfEndpoint id="router" address="http://localhost:9002/TestMessage"
    wsdlURL="ship.wsdl"
    endpointName="s:TestSoapEndpoint"
    serviceName="s:TestService"
    xmlns:s="http://test">
  <cxf:properties>
    <!-- enable sending the stack trace back to client; the default value is false-->
    <entry key="faultStackTraceEnabled" value="true" />
    <entry key="dataFormat" value="PAYLOAD" />
  </cxf:properties>
</cxf:cxfEndpoint>
Copy to Clipboard Toggle word wrap
For security reasons, the stack trace does not include the causing exception (that is, the part of a stack trace that follows Caused by). If you want to include the causing exception in the stack trace, set the exceptionMessageCauseEnabled property to true in the cxfEndpoint element, as follows:
<cxf:cxfEndpoint id="router" address="http://localhost:9002/TestMessage"
    wsdlURL="ship.wsdl"
    endpointName="s:TestSoapEndpoint"
    serviceName="s:TestService"
    xmlns:s="http://test">
  <cxf:properties>
    <!-- enable to show the cause exception message and the default value is false -->
 <entry key="exceptionMessageCauseEnabled" value="true" />
    <!-- enable to send the stack trace back to client,  the default value is false-->
    <entry key="faultStackTraceEnabled" value="true" />
    <entry key="dataFormat" value="PAYLOAD" />
  </cxf:properties>
</cxf:cxfEndpoint>
Copy to Clipboard Toggle word wrap
Warning
You should only enable the exceptionMessageCauseEnabled flag for testing and diagnostic purposes. It is normal practice for servers to conceal the original cause of an exception to make it harder for hostile users to probe the server.

Streaming Support in PAYLOAD mode

In 2.8.2, the camel-cxf component now supports streaming of incoming messages when using PAYLOAD mode. Previously, the incoming messages would have been completely DOM parsed. For large messages, this is time consuming and uses a significant amount of memory. Starting in 2.8.2, the incoming messages can remain as a javax.xml.transform.Source while being routed and, if nothing modifies the payload, can then be directly streamed out to the target destination. For common "simple proxy" use cases (example: from("cxf:...").to("cxf:...")), this can provide very significant performance increases as well as significantly lowered memory requirements.
However, there are cases where streaming may not be appropriate or desired. Due to the streaming nature, invalid incoming XML may not be caught until later in the processing chain. Also, certain actions may require the message to be DOM parsed anyway (like WS-Security or message tracing and such) in which case the advantages of the streaming is limited. At this point, there are two ways to control the streaming:
  • Endpoint property: you can add "allowStreaming=false" as an endpoint property to turn the streaming on/off.
  • Component property: the CxfComponent object also has an allowStreaming property that can set the default for endpoints created from that component.
  • Global system property: you can add a system property of "org.apache.camel.component.cxf.streaming" to "false" to turn if off. That sets the global default, but setting the endpoint property above will override this value for that endpoint.

Using the generic CXF Dispatch mode

From 2.8.0, the camel-cxf component supports the generic CXF dispatch mode that can transport messages of arbitrary structures (i.e., not bound to a specific XML schema). To use this mode, you simply omit specifying the wsdlURL and serviceClass attributes of the CXF endpoint.
<cxf:cxfEndpoint id="testEndpoint" address="http://localhost:9000/SoapContext/SoapAnyPort">
     <cxf:properties>
       <entry key="dataFormat" value="PAYLOAD"/>
     </cxf:properties>
   </cxf:cxfEndpoint>
Copy to Clipboard Toggle word wrap
It is noted that the default CXF dispatch client does not send a specific SOAPAction header. Therefore, when the target service requires a specific SOAPAction value, it is supplied in the Camel header using the key SOAPAction (case-insensitive).

Chapter 27. CXF Bean Component

CXF Bean Component (2.0 or later)

The cxfbean: component allows other Camel endpoints to send exchange and invoke Web service bean objects. Currently, it only supports JAXRS and JAXWS (new to Camel 2.1) annotated service beans.
Important
CxfBeanEndpoint is a ProcessorEndpoint so it has no consumers. It works similarly to a Bean component.

URI format

cxfbean:serviceBeanRef
Copy to Clipboard Toggle word wrap
Where serviceBeanRef is a registry key to look up the service bean object. If serviceBeanRef references a List object, elements of the List are the service bean objects accepted by the endpoint.

Options

Expand
Name Description Example Required? Default Value
bus CXF bus reference specified by the # notation. The referenced object must be an instance of org.apache.cxf.Bus. bus=#busName No Default bus created by CXF Bus Factory
cxfBeanBinding CXF bean binding specified by the # notation. The referenced object must be an instance of org.apache.camel.component.cxf.cxfbean.CxfBeanBinding. cxfBinding=#bindingName No DefaultCxfBeanBinding
headerFilterStrategy Header filter strategy specified by the # notation. The referenced object must be an instance of org.apache.camel.spi.HeaderFilterStrategy. headerFilterStrategy=#strategyName No CxfHeaderFilterStrategy
populateFromClass Since 2.3, the wsdlLocation annotated in the POJO is ignored (by default) unless this option is set to false. Prior to 2.3, the wsdlLocation annotated in the POJO is always honored and it is not possible to ignore. true, false No true
providers Since 2.5, setting the providers for the CXFRS endpoint. providers=#providerRef1,#providerRef2 No null
setDefaultBus Will set the default bus when CXF endpoint create a bus by itself. true, false No false

Headers

Expand
Name Description Type Required? Default Value In/Out Examples
CamelHttpCharacterEncoding (before 2.0-m2: CamelCxfBeanCharacterEncoding) Character encoding String No None In ISO-8859-1
CamelContentType (before 2.0-m2: CamelCxfBeanContentType) Content type String No \**/*\* In text/xml
CamelHttpBaseUri (2.0-m3 and before: CamelCxfBeanRequestBasePath)
The value of this header will be set in the CXF message as the Message.BASE_PATH property. It is needed by CXF JAX-RS processing. Basically, it is the scheme, host and port portion of the request URI. String Yes The Endpoint URI of the source endpoint in the Camel exchange In http://localhost:9000
CamelHttpPath (before 2.0-m2: CamelCxfBeanRequestPat{}h) Request URI's path String Yes None In consumer/123
CamelHttpMethod (before 2.0-m2: CamelCxfBeanVerb) RESTful request verb String Yes None In GET, PUT, POST, DELETE
CamelHttpResponseCode HTTP response code Integer No None Out 200
Note
Currently, CXF Bean component has (only) been tested with Jetty HTTP component it can understand headers from Jetty HTTP component without requiring conversion.

A Working Sample

This sample shows how to create a route that starts a Jetty HTTP server. The route sends requests to a CXF Bean and invokes a JAXRS annotated service.
First, create a route as follows. The from endpoint is a Jetty HTTP endpoint that is listening on port 9000. Notice that the matchOnUriPrefix option must be set to true because RESTful request URI will not match the endpoint's URI http://localhost:9000 exactly.
<route>
	<from uri="jetty:http://localhost:9000?matchOnUriPrefix=true" />
	<to uri="cxfbean:customerServiceBean" />
	<to uri="mock:endpointA" />
</route>
Copy to Clipboard Toggle word wrap
The to endpoint is a CXF Bean with bean name customerServiceBean. The name will be looked up from the registry. Next, we make sure our service bean is available in Spring registry. We create a bean definition in the Spring configuration. In this example, we create a List of service beans (of one element). We could have created just a single bean without a List.
<util:list id="customerServiceBean">
	<bean class="org.apache.camel.component.cxf.jaxrs.testbean.CustomerService" />
</util:list>

<bean class="org.apache.camel.wsdl_first.PersonImpl" id="jaxwsBean" />
Copy to Clipboard Toggle word wrap
That's it. Once the route is started, the web service is ready for business. A HTTP client can make a request and receive response.
url = new URL("http://localhost:9000/customerservice/orders/223/products/323");
in = url.openStream();
assertEquals("{\"Product\":{\"description\":\"product 323\",\"id\":323}}", CxfUtils.getStringFromInputStream(in));
Copy to Clipboard Toggle word wrap

Chapter 28. CXFRS

CXFRS Component

The cxfrs: component provides integration with Apache CXF for connecting to JAX-RS services hosted in CXF.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
   <groupId>org.apache.camel</groupId>
   <artifactId>camel-cxf</artifactId>
   <version>x.x.x</version>  <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap
Note
When using CXF as a consumer, the CAMEL:CXF Bean Component allows you to factor out how message payloads are received from their processing as a RESTful or SOAP web service. This has the potential of using a multitude of transports to consume web services. The bean component's configuration is also simpler and provides the fastest method to implement web services using Camel and CXF.

URI format

cxfrs://address?options
Copy to Clipboard Toggle word wrap
Where address represents the CXF endpoint's address
cxfrs:bean:rsEndpoint
Copy to Clipboard Toggle word wrap
Where rsEndpoint represents the Spring bean's name which represents the CXFRS client or server
For either style above, you can append options to the URI as follows:
cxfrs:bean:cxfEndpoint?resourceClasses=org.apache.camel.rs.Example
Copy to Clipboard Toggle word wrap

Options

Expand
Name Description Example Required? default value
resourceClasses The resource classes which you want to export as REST service. Multiple classes can be separated by a comma.
resourceClasses=org.apache.camel.rs.Example1,org.apache.camel.rs.Exchange2
No None
httpClientAPI New to Apache Camel 2.1 If true, the CxfRsProducer will use the HttpClientAPI to invoke the service httpClientAPI=true No true
synchronous New in 2.5, this option will let CxfRsConsumer decide to use sync or async API to do the underlying work. The default value is false which means it will try to use async API by default. synchronous=true No false
throwExceptionOnFailure New in 2.6, this option tells the CxfRsProducer to inspect return codes and will generate an Exception if the return code is larger than 207. throwExceptionOnFailure=true No true
maxClientCacheSize New in 2.6, you can set the In message header, CamelDestinationOverrideUrl, to dynamically override the target destination Web Service or REST Service defined in your routes. The implementation caches CXF clients or ClientFactoryBean in CxfProvider and CxfRsProvider. This option allows you to configure the maximum size of the cache. maxClientCacheSize=5 No 10
setDefaultBus New in 2.9.0. Will set the default bus when CXF endpoint create a bus by itself setDefaultBus=true No false
bus New in 2.9.0. A default bus created by CXF Bus Factory. Use \# notation to reference a bus object from the registry. The referenced object must be an instance of org.apache.cxf.Bus. bus=#busName No None
bindingStyle
As of 2.11. Sets how requests and responses will be mapped to/from Camel. Two values are possible:
  • SimpleConsumer => see the Consuming a REST Request with the Simple Binding Style below.
  • Default => the default style. For consumers this passes on a MessageContentsList to the route, requiring low-level processing in the route.
  • Custom => allows you to specify a custom binding through the binding option.
bindingStyle=SimpleConsumer No Default
binding
Allows you to specify a custom CxfRsBinding implementation to perform low-level processing of the raw CXF request and response objects. The implementation must be bound in the Camel registry, and you must use the hash (#) notation to refer to it.
binding=#myBinding
No
DefaultCxfRsBinding
providers
Since Camel 2.12.2 set custom JAX-RS providers list to the CxfRs endpoint.
providers=#MyProviders
No
None
schemaLocations
Since Camel 2.12.2 Sets the locations of the schemas which can be used to validate the incoming XML or JAXB-driven JSON.
schemaLocations=#MySchemaLocations
No
None
features
Since Camel 2.12.3 Set the feature list to the CxfRs endpoint.
features=#MyFeatures
No
None
properties
Since Camel 2.12.4 Set the properties to the CxfRs endpoint.
properties=#MyProperties
No
None
inInterceptors
Since Camel 2.12.4 Set the inInterceptors to the CxfRs endpoint.
inInterceptors=#MyInterceptors
No
None
outInterceptors
Since Camel 2.12.4 Set the outInterceptor to the CxfRs endpoint.
outInterceptors=#MyInterceptors
No
None
inFaultInterceptors
Since Camel 2.12.4 Set the inFaultInterceptors to the CxfRs endpoint.
inFaultInterceptors=#MyInterceptors
No
None
outFaultIntercetpros
Since Camel 2.12.4 Set the outFaultInterceptors to the CxfRs endpoint.
outFaultInterceptors=#MyInterceptors
No
None
continuationTimeout
Since Camel 2.14.0 This option is used to set the CXF continuation timeout which could be used in CxfConsumer by default when the CXF server is using Jetty or Servlet transport. (Before Camel 2.14.0, CxfConsumer just set the continuation timeout to be 0, which means the continuation suspend operation never timeout.)
continuationTimeout=800000
No
30000
ignoreDeleteMethodMessageBody
Since Camel 2.14.1 This option is used to tell CxfRsProducer to ignore the message body of the DELETE method when using HTTP API.
ignoreDeleteMethodMessageBody=true
No
false
modelRef
Since Camel 2.14.2 This option is used to specify the model file which is useful for the resource class without annotation.
Since Camel 2.15 This option can point to a model file without specifying a service class for emulating document-only endpoints.
modelRef=classpath:/CustomerServiceModel.xml
No
None
performInvocation
Since Camel 2.15 When the option is true, camel will perform the invocation of the resource class instance and put the response object into the exchange for further processing.
performInvocation=true
No
false
propagateContexts
Since Camel 2.15 When true, JAXRS UriInfo, HttpHeaders, Request and SecurityContext contexts will be available to custom CXFRS processors as typed Camel exchange properties. These contexts can be used to analyze the current requests using JAX-RS API.
You can also configure the CXF REST endpoint through the Spring configuration. Since there are lots of differences between the CXF REST client and CXF REST Server, we provide different configurations for them. Please check out the schema file and the CXF JAX-RS documentation for more information.

How to configure the REST endpoint in Apache Camel

In camel-cxf schema file, there are two elements for the REST endpoint definition. cxf:rsServer for REST consumer, cxf:rsClient for REST producer. You can find a Apache Camel REST service route configuration example here.
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:cxf="http://camel.apache.org/schema/cxf"
       xmlns:jaxrs="http://cxf.apache.org/jaxrs"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://camel.apache.org/schema/cxf http://camel.apache.org/schema/cxf/camel-cxf.xsd
       http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd
       http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd
    ">
  <!-- Defined the real JAXRS back end service  -->
  <jaxrs:server id="restService"
		        address="http://localhost:9002/rest" 
		        staticSubresourceResolution="true">
    <jaxrs:serviceBeans>
      <ref bean="customerService"/>
    </jaxrs:serviceBeans>       
  </jaxrs:server>
  
  <!--bean id="jsonProvider" class="org.apache.cxf.jaxrs.provider.JSONProvider"/-->

  <bean id="customerService" class="org.apache.camel.component.cxf.jaxrs.testbean.CustomerService" />
   
  <!-- Defined the server endpoint to create the cxf-rs consumer --> 
  <cxf:rsServer id="rsServer" address="http://localhost:9000/route"
    serviceClass="org.apache.camel.component.cxf.jaxrs.testbean.CustomerService" 
      loggingFeatureEnabled="true" loggingSizeLimit="20" skipFaultLogging="true"/>

  <!-- Defined the client endpoint to create the cxf-rs consumer -->
  <cxf:rsClient id="rsClient" address="http://localhost:9002/rest"
    serviceClass="org.apache.camel.component.cxf.jaxrs.testbean.CustomerService"
      loggingFeatureEnabled="true" skipFaultLogging="true"/>
  
  <!-- The camel route context -->
  <camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
    <route>
       <from uri="cxfrs://bean://rsServer"/>
       <!-- We can remove this configure as the CXFRS producer is using the HttpAPI by default -->
       <setHeader headerName="CamelCxfRsUsingHttpAPI">
         <constant>True</constant>        
       </setHeader>
       <to uri="cxfrs://bean://rsClient"/>
    </route>
  </camelContext>
  
</beans>
Copy to Clipboard Toggle word wrap
The camel-cxfrs producer supports to override the services address by setting the message with the key of "CamelDestinationOverrideUrl".
// set up the service address from the message header to override the setting of CXF endpoint
exchange.getIn().setHeader(Exchange.DESTINATION_OVERRIDE_URL, constant(getServiceAddress()));
Copy to Clipboard Toggle word wrap

Consuming a REST Request - Simple Binding Style

Available as of Camel 2.11
The Default binding style is rather low-level, requiring the user to manually process the MessageContentsList object coming into the route. Thus, it tightly couples the route logic with the method signature and parameter indices of the JAX-RS operation. Somewhat inelegant, difficult and error-prone.
In contrast, the SimpleConsumer binding style performs the following mappings, in order to make the request data more accessible to you within the Camel Message:
  • JAX-RS Parameters (@HeaderParam, @QueryParam, etc.) are injected as IN message headers. The header name matches the value of the annotation.
  • The request entity (POJO or other type) becomes the IN message body. If a single entity cannot be identified in the JAX-RS method signature, it falls back to the original MessageContentsList.
  • Binary @Multipart body parts become IN message attachments, supporting DataHandler, InputStream, DataSource and CXF's Attachment class.
  • Non-binary @Multipart body parts are mapped as IN message headers. The header name matches the Body Part name.
Additionally, the following rules apply to the Response mapping:
  • If the message body type is different to javax.ws.rs.core.Response (user-built response), a new Response is created and the message body is set as the entity (so long it's not null). The response status code is taken from the Exchange.HTTP_RESPONSE_CODE header, or defaults to 200 OK if not present.
  • If the message body type is equal to javax.ws.rs.core.Response, it means that the user has built a custom response, and therefore it is respected and it becomes the final response.
  • In all cases, Camel headers permitted by custom or default HeaderFilterStrategy are added to the HTTP response.

Enabling the Simple Binding Style

This binding style can be activated by setting the bindingStyle parameter in the consumer endpoint to value SimpleConsumer:
  from("cxfrs:bean:rsServer?bindingStyle=SimpleConsumer")
    .to("log:TEST?showAll=true");
Copy to Clipboard Toggle word wrap
Below is a list of method signatures along with the expected result from the Simple binding.
public Response doAction(BusinessObject request); Request payload is placed in IN message body, replacing the original MessageContentsList.
public Response doAction(BusinessObject request, @HeaderParam("abcd") String abcd, @QueryParam("defg") String defg); Request payload placed in IN message body, replacing the original MessageContentsList. Both request params mapped as IN message headers with names abcd and defg.
public Response doAction(@HeaderParam("abcd") String abcd, @QueryParam("defg") String defg); Both request params mapped as IN message headers with names abcd and defg. The original MessageContentsList is preserved, even though it only contains the 2 parameters.
public Response doAction(@Multipart(value="body1") BusinessObject request, @Multipart(value="body2") BusinessObject request2); The first parameter is transferred as a header with name body1, and the second one is mapped as header body2. The original MessageContentsList is preserved as the IN message body.
public Response doAction(InputStream abcd); The InputStream is unwrapped from the MessageContentsList and preserved as the IN message body.
public Response doAction(DataHandler abcd); The DataHandler is unwrapped from the MessageContentsList and preserved as the IN message body.

More examples of the Simple Binding Style

Given a JAX-RS resource class with this method:
    @POST @Path("/customers/{type}")
    public Response newCustomer(Customer customer, @PathParam("type") String type, @QueryParam("active") @DefaultValue("true") boolean active) {
        return null;
    }
Copy to Clipboard Toggle word wrap
Serviced by the following route:
    from("cxfrs:bean:rsServer?bindingStyle=SimpleConsumer")
        .recipientList(simple("direct:${header.operationName}"));

    from("direct:newCustomer")
        .log("Request: type=${header.type}, active=${header.active}, customerData=${body}");
Copy to Clipboard Toggle word wrap
The following HTTP request with XML payload (given that the Customer DTO is JAXB-annotated):
POST /customers/gold?active=true

Payload:
<Customer>
  <fullName>Raul Kripalani</fullName>
  <country>Spain</country>
  <project>Apache Camel</project>
</Customer>
Copy to Clipboard Toggle word wrap
Will print the message:
Request: type=gold, active=true, customerData=<Customer.toString() representation>
Copy to Clipboard Toggle word wrap
For more examples on how to process requests and write responses can be found here.

Consuming a REST Request - Default Binding Style

The CXF JAX-RS front end implements the JAX-RS (JSR-311) API, so we can export the resources classes as a REST service. And we leverage the CXF Invoker API to turn a REST request into a normal Java object method invocation. Unlike the camel-restlet component, you don't need to specify the URI template within your endpoint, CXF takes care of the REST request URI to resource class method mapping according to the JSR-311 specification. All you need to do in Apache Camel is delegate this method request to a right processor or endpoint.
Here is an example of a CXFRS route:
private static final String CXF_RS_ENDPOINT_URI = "cxfrs://http://localhost:" + CXT + "/rest?resourceClasses=org.apache.camel.component.cxf.jaxrs.testbean.CustomerServiceResource";
 
 protected RouteBuilder createRouteBuilder() throws Exception {
    return new RouteBuilder() {
        public void configure() {
            errorHandler(new NoErrorHandlerBuilder());
            from(CXF_RS_ENDPOINT_URI).process(new Processor() {

                public void process(Exchange exchange) throws Exception {
                    Message inMessage = exchange.getIn();                        
                    // Get the operation name from in message
                    String operationName = inMessage.getHeader(CxfConstants.OPERATION_NAME, String.class);
                    if ("getCustomer".equals(operationName)) {
                        String httpMethod = inMessage.getHeader(Exchange.HTTP_METHOD, String.class);
                        assertEquals("Get a wrong http method", "GET", httpMethod);
                        String path = inMessage.getHeader(Exchange.HTTP_PATH, String.class);
                        // The parameter of the invocation is stored in the body of in message
                        String id = inMessage.getBody(String.class);
                        if ("/customerservice/customers/126".equals(path)) {                            
                            Customer customer = new Customer();
                            customer.setId(Long.parseLong(id));
                            customer.setName("Willem");
                            // We just put the response Object into the out message body
                            exchange.getOut().setBody(customer);
                        } else {
                            if ("/customerservice/customers/400".equals(path)) {
                                // We return the remote client IP address this time
                                org.apache.cxf.message.Message cxfMessage = inMessage.getHeader(CxfConstants.CAMEL_CXF_MESSAGE, org.apache.cxf.message.Message.class);
                                ServletRequest request = (ServletRequest) cxfMessage.get("HTTP.REQUEST");
                                String remoteAddress = request.getRemoteAddr();
                                Response r = Response.status(200).entity("The remoteAddress is " + remoteAddress).build();
                                exchange.getOut().setBody(r);
                                return;
                            }
                            if ("/customerservice/customers/123".equals(path)) {
                                 // send a customer response back
                                 Response r = Response.status(200).entity("customer response back!").build();
                                 exchange.getOut().setBody(r);
                                 return;
                            }
                            if ("/customerservice/customers/456".equals(path)) {
                                Response r = Response.status(404).entity("Can't found the customer with uri " + path).build();
                                throw new WebApplicationException(r);
                            } else {
                                throw new RuntimeCamelException("Can't found the customer with uri " + path);
                            }
                        }
                    }
                    if ("updateCustomer".equals(operationName)) {
                        assertEquals("Get a wrong customer message header", "header1;header2", inMessage.getHeader("test"));
                        String httpMethod = inMessage.getHeader(Exchange.HTTP_METHOD, String.class);
                        assertEquals("Get a wrong http method", "PUT", httpMethod);
                        Customer customer = inMessage.getBody(Customer.class);
                        assertNotNull("The customer should not be null.", customer);
                        // Now you can do what you want on the customer object
                        assertEquals("Get a wrong customer name.", "Mary", customer.getName());
                        // set the response back
                        exchange.getOut().setBody(Response.ok().build());
                }
                }
                
            });
        }
    };
}
Copy to Clipboard Toggle word wrap
The corresponding resource class used to configure the endpoint is defined as an interface:
@Path("/customerservice/")
public interface CustomerServiceResource {
 
    @GET
    @Path("/customers/{id}/")
    Customer getCustomer(@PathParam("id") String id);
 
    @PUT
    @Path("/customers/")
    Response updateCustomer(Customer customer);
 }
Copy to Clipboard Toggle word wrap
Important
By default, JAX-RS resource classes are used to configure the JAX-RS properties only. The methods will not be executed during the routing of messages to the endpoint, the route itself is responsible for all processing instead.
Note
Note that starting from Camel 2.15, it is also sufficient to provide an interface only, as opposed to a no-op service implementation class for the default mode. Starting from Camel 2.15, if the performInvocation option is enabled, the service implementation will be invoked first, the response will be set on the Camel exchange and the route execution will continue as usual. This can be useful for integrating the existing JAX-RS implementations into Camel routes and for post-processing JAX-RS Responses in custom processors.
The CXF JAXRS front end implements a proxy-based client API, with this API you can invoke the remote REST service through a proxy. The camel-cxfrs producer is based on this proxy API. You just need to specify the operation name in the message header and prepare the parameter in the message body, the camel-cxfrs producer will generate the right REST request for you.
Here is an example:
Exchange exchange = template.send("direct://proxy", new Processor() {

    public void process(Exchange exchange) throws Exception {
        exchange.setPattern(ExchangePattern.InOut);
        Message inMessage = exchange.getIn();
        setupDestinationURL(inMessage);
        // set the operation name 
        inMessage.setHeader(CxfConstants.OPERATION_NAME, "getCustomer");
        // using the proxy client API
        inMessage.setHeader(CxfConstants.CAMEL_CXF_RS_USING_HTTP_API, Boolean.FALSE);
        // set a customer header
        inMessage.setHeader("key", "value");
        // set the parameters , if you just have one parameter 
        // camel will put this object into an Object[] itself
        inMessage.setBody("123");
    }
    
});
     
// get the response message 
Customer response = (Customer) exchange.getOut().getBody();

assertNotNull("The response should not be null ", response);
assertEquals("Get a wrong customer id ", String.valueOf(response.getId()), "123");
assertEquals("Get a wrong customer name", response.getName(), "John");
assertEquals("Get a wrong response code", 200, exchange.getOut().getHeader(Exchange.HTTP_RESPONSE_CODE));
assertEquals("Get a wrong header value", "value", exchange.getOut().getHeader("key"));
Copy to Clipboard Toggle word wrap
CXF JAXRS front end also provides a http centric client API, You can also invoke this API from camel-cxfrs producer. You need to specify the HTTP_PATH and Http method and let the the producer know to use the HTTP centric client by using the URI option httpClientAPI or set the message header with CxfConstants.CAMEL_CXF_RS_USING_HTTP_API. You can turn the response object to the type class that you specify with CxfConstants.CAMEL_CXF_RS_RESPONSE_CLASS.
Exchange exchange = template.send("direct://http", new Processor() {

    public void process(Exchange exchange) throws Exception {
        exchange.setPattern(ExchangePattern.InOut);
        Message inMessage = exchange.getIn();
        setupDestinationURL(inMessage);
        // using the http central client API
        inMessage.setHeader(CxfConstants.CAMEL_CXF_RS_USING_HTTP_API, Boolean.TRUE);
        // set the Http method
        inMessage.setHeader(Exchange.HTTP_METHOD, "GET");
        // set the relative path
        inMessage.setHeader(Exchange.HTTP_PATH, "/customerservice/customers/123");                
        // Specify the response class , cxfrs will use InputStream as the response object type 
        inMessage.setHeader(CxfConstants.CAMEL_CXF_RS_RESPONSE_CLASS, Customer.class);
        // set a customer header
        inMessage.setHeader("key", "value");
        // since we use the Get method, so we don't need to set the message body
        inMessage.setBody(null);                
    }
    
});
     
// get the response message 
Customer response = (Customer) exchange.getOut().getBody();

assertNotNull("The response should not be null ", response);
assertEquals("Get a wrong customer id ", String.valueOf(response.getId()), "123");
assertEquals("Get a wrong customer name", response.getName(), "John");
assertEquals("Get a wrong response code", 200, exchange.getOut().getHeader(Exchange.HTTP_RESPONSE_CODE));
assertEquals("Get a wrong header value", "value", exchange.getOut().getHeader("key"));
Copy to Clipboard Toggle word wrap
From Apache Camel 2.1, we also support to specify the query parameters from CXFRS URI for the CXFRS HTTP centric client.
Exchange exchange = template.send("cxfrs://http://localhost:" + getPort2() + "/" + getClass().getSimpleName() + "/testQuery?httpClientAPI=true&q1=12&q2=13"
Copy to Clipboard Toggle word wrap
To support the Dynamical routing, you can override the URI's query parameters by using the CxfConstants.CAMEL_CXF_RS_QUERY_MAP header to set the parameter map for it.
Map<String, String> queryMap = new LinkedHashMap<String, String>();                    
queryMap.put("q1", "new");
queryMap.put("q2", "world");                    
inMessage.setHeader(CxfConstants.CAMEL_CXF_RS_QUERY_MAP, queryMap);
Copy to Clipboard Toggle word wrap

Chapter 29. DataFormat Component

Data Format Component

Available as of Camel 2.12
The dataformat: component allows to use Data Format as a Camel Component.

URI format

dataformat:name:(marshal|unmarshal)[?options]
Copy to Clipboard Toggle word wrap
Where name is the name of the Data Format. And then followed by the operation which must either be marshal or unmarshal. The options is used for configuring the Data Format in use. See the Data Format documentation for which options it support.

Samples

For example to use the JAXB Data Format we can do as follows:
from("activemq:My.Queue").
  to("dataformat:jaxb:unmarshal?contextPath=com.acme.model").
  to("mqseries:Another.Queue");
Copy to Clipboard Toggle word wrap
And in XML DSL you do:
<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="activemq:My.Queue"/>
    <to uri="dataformat:jaxb:unmarshal?contextPath=com.acme.model"/>
    <to uri="mqseries:Another.Queue"/>
  </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Chapter 30. DataSet

DataSet Component

The DataSet component (available since 1.3.0) provides a mechanism to easily perform load & soak testing of your system. It works by allowing you to create DataSet instances both as a source of messages and as a way to assert that the data set is received.
Apache Camel will use the throughput logger when sending dataset's.

URI format

dataset:name[?options]
Copy to Clipboard Toggle word wrap
Where name is used to find the DataSet instance in the Registry
Apache Camel ships with a support implementation of org.apache.camel.component.dataset.DataSet, the org.apache.camel.component.dataset.DataSetSupport class, that can be used as a base for implementing your own DataSet. Apache Camel also ships with a default implementation, the org.apache.camel.component.dataset.SimpleDataSet that can be used for testing.

Options

Expand
Option Default Description
produceDelay 3 Allows a delay in ms to be specified, which causes producers to pause in order to simulate slow producers. Uses a minimum of 3 ms delay unless you set this option to -1 to force no delay at all.
consumeDelay 0 Allows a delay in ms to be specified, which causes consumers to pause in order to simulate slow consumers.
preloadSize 0 Sets how many messages should be preloaded (sent) before the route completes its initialization.
initialDelay 1000 Camel 2.1: Time period in millis to wait before starting sending messages.
minRate 0 Wait until the DataSet contains at least this number of messages
You can append query options to the URI in the following format, ?option=value&option=value&...

Configuring DataSet

Apache Camel will lookup in the Registry for a bean implementing the DataSet interface. So you can register your own DataSet as:
   <bean id="myDataSet" class="com.mycompany.MyDataSet">
      <property name="size" value="100"/>
   </bean>
Copy to Clipboard Toggle word wrap

Example

For example, to test that a set of messages are sent to a queue and then consumed from the queue without losing any messages:
// send the dataset to a queue
from("dataset:foo").to("activemq:SomeQueue");

// now lets test that the messages are consumed correctly
from("activemq:SomeQueue").to("dataset:foo");
Copy to Clipboard Toggle word wrap
The above would look in the Registry to find the foo DataSet instance which is used to create the messages.
Then you create a DataSet implementation, such as using the SimpleDataSet as described below, configuring things like how big the data set is and what the messages look like etc.

Properties on SimpleDataSet

Expand
Property Type Default Description
defaultBody Object <hello>world!</hello> Specifies the default message body. For SimpleDataSet it is a constant payload; though if you want to create custom payloads per message, create your own derivation of DataSetSupport.
reportCount long -1 Specifies the number of messages to be received before reporting progress. Useful for showing progress of a large load test. If < 0, then size / 5, if is 0 then size, else set to reportCount value.
size long 10 Specifies how many messages to send/consume.

Chapter 31. Direct

Direct Component

The direct: component provides direct, synchronous invocation of any consumers when a producer sends a message exchange. This endpoint can be used to connect existing routes in the same camel context.
Note
The SEDA component provides asynchronous invocation of any consumers when a producer sends a message exchange.
Note
The VM component provides connections between Camel contexts as long they run in the same JVM.

URI format

direct:someName[?options]
Copy to Clipboard Toggle word wrap
Where someName can be any string to uniquely identify the endpoint

Options

Expand
Name Default Value Description
block false Camel 2.11.1: If sending a message to a direct endpoint which has no active consumer, then we can tell the producer to block and wait for the consumer to become active.
timeout 30000 Camel 2.11.1: The timeout value to use if block is enabled.
You can append query options to the URI in the following format, ?option=value&option=value&...

Samples

In the route below we use the direct component to link the two routes together:
from("activemq:queue:order.in")
    .to("bean:orderServer?method=validate")
    .to("direct:processOrder");

from("direct:processOrder")
    .to("bean:orderService?method=process")
    .to("activemq:queue:order.out");
Copy to Clipboard Toggle word wrap
And the sample using spring DSL:
   <route>
     <from uri="activemq:queue:order.in"/>
     <to uri="bean:orderService?method=validate"/>
     <to uri="direct:processOrder"/>
  </route>

  <route>
     <from uri="direct:processOrder"/>
     <to uri="bean:orderService?method=process"/>
     <to uri="activemq:queue:order.out"/>
  </route>
Copy to Clipboard Toggle word wrap
See also samples from the SEDA component, how they can be used together.

Chapter 32. Direct-VM

Direct VM Component

Available as of Camel 2.10
The direct-vm: component provides direct, synchronous invocation of any consumers in the JVM when a producer sends a message exchange. This endpoint can be used to connect existing routes in the same camel context, as well from other camel contexts in the same JVM.
This component differs from the Direct component in that Direct-VM supports communication across CamelContext instances - so you can use this mechanism to communicate across web applications (provided that camel-core.jar is on the system/boot classpath).
At runtime you can swap in new consumers, by stopping the existing consumer(s) and start new consumers. But at any given time there can be at most only one active consumer for a given endpoint.
This component allows also to connect routes deployed in different OSGI Bundles as you can see here after. Even if they are running in different bundles, the camel routes will use the same thread. That autorises to develop applications using Transactions - Tx.

URI format

direct-vm:someName
Copy to Clipboard Toggle word wrap
Where someName can be any string to uniquely identify the endpoint

Options

Expand
Name Default Value Description
block false Camel 2.11.1: If sending a message to a direct endpoint which has no active consumer, then we can tell the producer to block and wait for the consumer to become active.
timeout 30000 Camel 2.11.1: The timeout value to use if block is enabled.

Samples

In the route below we use the direct component to link the two routes together:
from("activemq:queue:order.in")
    .to("bean:orderServer?method=validate")
    .to("direct-vm:processOrder");
Copy to Clipboard Toggle word wrap
And now in another CamelContext, such as another OSGi bundle
from("direct-vm:processOrder")
    .to("bean:orderService?method=process")
    .to("activemq:queue:order.out");
Copy to Clipboard Toggle word wrap
And the sample using spring DSL:
   <route>
     <from uri="activemq:queue:order.in"/>
     <to uri="bean:orderService?method=validate"/>
     <to uri="direct-vm:processOrder"/>
  </route>

  <route>
     <from uri="direct-vm:processOrder"/>
     <to uri="bean:orderService?method=process"/>
     <to uri="activemq:queue:order.out"/>
  </route>
Copy to Clipboard Toggle word wrap

Chapter 33. Disruptor

Disruptor Component

Available as of Camel 2.12
The disruptor: component provides asynchronous SEDA behavior much as the standard SEDA Component, but utilizes a Disruptor instead of a BlockingQueue utilized by the standard SEDA. Alternatively, a
disruptor-vm: endpoint is supported by this component, providing an alternative to the standard VM. As with the SEDA component, buffers of the disruptor: endpoints are only visible within a single CamelContext and no support is provided for persistence or recovery. The buffers of the *disruptor-vm:* endpoints also provides support for communication across CamelContexts instances so you can use this mechanism to communicate across web applications (provided that camel-disruptor.jar is on the system/boot classpath).
The main advantage of choosing to use the Disruptor Component over the SEDA or the VM Component is performance in use cases where there is high contention between producer(s) and/or multicasted or concurrent Consumers. In those cases, significant increases of throughput and reduction of latency has been observed. Performance in scenarios without contention is comparable to the SEDA and VM Components.
The Disruptor is implemented with the intention of mimicing the behaviour and options of the SEDA and VM Components as much as possible. The main differences with the them are the following:
  • The buffer used is always bounded in size (default 1024 exchanges).
  • As a the buffer is always bouded, the default behaviour for the Disruptor is to block while the buffer is full instead of throwing an exception. This default behaviour may be configured on the component (see options).
  • The Disruptor enpoints don't implement the BrowsableEndpoint interface. As such, the exchanges currently in the Disruptor can't be retrieved, only the amount of exchanges.
  • The Disruptor requires its consumers (multicasted or otherwise) to be statically configured. Adding or removing consumers on the fly requires complete flushing of all pending exchanges in the Disruptor.
  • As a result of the reconfiguration: Data sent over a Disruptor is directly processed and 'gone' if there is at least one consumer, late joiners only get new exchanges published after they've joined.
  • The pollTimeout option is not supported by the Disruptor Component.
  • When a producer blocks on a full Disruptor, it does not respond to thread interrupts.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-disruptor</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

 disruptor:someName[?options]
Copy to Clipboard Toggle word wrap
or
 disruptor-vm:someName[?options]
Copy to Clipboard Toggle word wrap
Where *someName* can be any string that uniquely identifies the endpoint within the current CamelContext (or across contexts in case of *disruptor-vm:*). You can append query options to the URI in the following format:
  ?option=value&option=value&...
Copy to Clipboard Toggle word wrap

Options

All the following options are valid for both the *disruptor:* and *disruptor-vm:* components.
Expand
Name Default Description
size 1024 The maximum capacity of the Disruptors ringbuffer. Will be effectively increased to the nearest power of two. Notice: Mind if you use this option, then its the first endpoint being created with the queue name, that determines the size. To make sure all endpoints use same size, then configure the size option on all of them, or the first endpoint being created.
bufferSize Component only: The maximum default size (capacity of the number of messages it can hold) of the Disruptors ringbuffer. This option is used if size is not in use.
queueSize Component only: Additional option to specify the <em>bufferSize</em> to maintain maximum compatibility with the SEDA Component.
concurrentConsumers 1 Number of concurrent threads processing exchanges.
waitForTaskToComplete IfReplyExpected Option to specify whether the caller should wait for the async task to complete or not before continuing. The following three options are supported: Always, Never or IfReplyExpected. The first two values are self-explanatory. The last value, IfReplyExpected, will only wait if the message is Request Reply based. See more information about Async messaging.
timeout 30000 Timeout (in milliseconds) before a producer will stop waiting for an asynchronous task to complete. See waitForTaskToComplete and Async for more details. You can disable timeout by using 0 or a negative value.
defaultMultipleConsumers Component only: Allows to set the default allowance of multiple consumers for endpoints created by this comonent used when multipleConsumers is not provided.
multipleConsumers
false
Specifies whether multiple consumers are allowed. If enabled, you can use Disruptor for Publish-Subscribe messaging. That is, you can send a message to the SEDA queue and have each consumer receive a copy of the message. When enabled, this option should be specified on every consumer endpoint.
limitConcurrentConsumers true Whether to limit the number of concurrentConsumers to the maximum of 500. By default, an exception will be thrown if a Disruptor endpoint is configured with a greater number. You can disable that check by turning this option off.
blockWhenFull true Whether a thread that sends messages to a full Disruptor will block until the ringbuffer's capacity is no longer exhausted. By default, the calling thread will block and wait until the message can be accepted. By disabling this option, an exception will be thrown stating that the queue is full.
defaultBlockWhenFull Component only: Allows to set the default producer behaviour when the ringbuffer is full for endpoints created by this comonent used when blockWhenFull is not provided.
waitStrategy Blocking Defines the strategy used by consumer threads to wait on new exchanges to be published. The options allowed are:Blocking, Sleeping, BusySpin and Yielding. Refer to the section below for more information on this subject
defaultWaitStrategy Component only: Allows to set the default wait strategy for endpoints created by this comonent used when waitStrategy is not provided.
producerType Multi
Defines the producers allowed on the Disruptor. The options allowed are: Multi to allow multiple producers and Single to enable certain optimizations only allowed when one concurrent producer (on one thread or otherwise synchronized) is active.

Wait strategies

The wait strategy effects the type of waiting performed by the consumer threads that are currently waiting for the next exchange to be published. The following strategies can be chosen:
Expand
Name Description Advice
Blocking Blocking strategy that uses a lock and condition variable for Consumers waiting on a barrier. This strategy can be used when throughput and low-latency are not as important as CPU resource.
Sleeping Sleeping strategy that initially spins, then uses a Thread.yield(), and eventually for the minimum number of nanos the OS and JVM will allow while the Consumers are waiting on a barrier. This strategy is a good compromise between performance and CPU resource. Latency spikes can occur after quiet periods.
BusySpin Busy Spin strategy that uses a busy spin loop for Consumers waiting on a barrier. This strategy will use CPU resource to avoid syscalls which can introduce latency jitter. It is best used when threads can be bound to specific CPU cores.
Yielding Yielding strategy that uses a Thread.yield() for Consumers waiting on a barrier after an initially spinning. This strategy is a good compromise between performance and CPU resource without incurring significant latency spikes.

Use of Request Reply

The Disruptor component supports using Request Reply, where the caller will wait for the Async route to complete. For instance:
from("mina:tcp://0.0.0.0:9876?textline=true&sync=true").to("disruptor:input");
from("disruptor:input").to("bean:processInput").to("bean:createResponse");
Copy to Clipboard Toggle word wrap
In the route above, we have a TCP listener on port 9876 that accepts incoming requests. The request is routed to the disruptor:input buffer. As it is a Request Reply message, we wait for the response. When the consumer on the disruptor:input buffer is complete, it copies the response to the original message response.

Concurrent consumers

By default, the Disruptor endpoint uses a single consumer thread, but you can configure it to use concurrent consumer threads. So instead of thread pools you can use:
from("disruptor:stageName?concurrentConsumers=5").process(...)
Copy to Clipboard Toggle word wrap
As for the difference between the two, note a thread pool can increase/shrink dynamically at runtime depending on load, whereas the number of concurrent consumers is always fixed and supported by the Disruptor internally so performance will be higher.

Thread pools

Be aware that adding a thread pool to a Disruptor endpoint by doing something like:
from("disruptor:stageName").thread(5).process(...)
Copy to Clipboard Toggle word wrap
Can wind up with adding a normal BlockingQueue to be used in conjunction with the Disruptor, effectively negating part of the performance gains achieved by using the Disruptor. Instead, it is advices to directly configure number of threads that process messages on a Disruptor endpoint using the concurrentConsumers option.

Sample

In the route below we use the Disruptor to send the request to this async queue to be able to send a fire-and-forget message for further processing in another thread, and return a constant reply in this thread to the original caller.
public void configure() throws Exception {
    from("direct:start")
        // send it to the disruptor that is async
        .to("disruptor:next")
        // return a constant response
        .transform(constant("OK"));

    from("disruptor:next").to("mock:result");
}
Copy to Clipboard Toggle word wrap
Here we send a Hello World message and expects the reply to be OK.
Object out = template.requestBody("direct:start", "Hello World");
assertEquals("OK", out);
Copy to Clipboard Toggle word wrap
The "Hello World" message will be consumed from the Disruptor from another thread for further processing. Since this is from a unit test, it will be sent to a mock endpoint where we can do assertions in the unit test.

Using multipleConsumers

In this example we have defined two consumers and registered them as spring beans.
<!-- define the consumers as spring beans -->
<bean id="consumer1" class="org.apache.camel.spring.example.FooEventConsumer"/>

<bean id="consumer2" class="org.apache.camel.spring.example.AnotherFooEventConsumer"/>

<camelContext xmlns="http://camel.apache.org/schema/spring">
    <!-- define a shared endpoint which the consumers can refer to instead of using url -->
    <endpoint id="foo" uri="disruptor:foo?multipleConsumers=true"/>
</camelContext>
Copy to Clipboard Toggle word wrap
Since we have specified multipleConsumers=true on the Disruptor foo endpoint we can have those two or more consumers receive their own copy of the message as a kind of pub-sub style messaging. As the beans are part of an unit test they simply send the message to a mock endpoint, but notice how we can use @Consume to consume from the Disruptor.
public class FooEventConsumer {

    @EndpointInject(uri = "mock:result")
    private ProducerTemplate destination;

    @Consume(ref = "foo")
    public void doSomething(String body) {
        destination.sendBody("foo" + body);
    }

}
Copy to Clipboard Toggle word wrap

Extracting disruptor information

If needed, information such as buffer size, etc. can be obtained without using JMX in this fashion:
DisruptorEndpoint disruptor = context.getEndpoint("disruptor:xxxx");
int size = disruptor.getBufferSize();
Copy to Clipboard Toggle word wrap

Chapter 34. DNS

DNS

Available as of Camel 2.7
This is an additional component for Camel to run DNS queries, using DNSJava. The component is a thin layer on top of DNSJava. The component offers the following operations:
ip
To resolve a domain by its IP address.
lookup
To look up information about the domain.
dig
To run DNS queries.
Requires SUN JVM
The DNSJava library requires running on the SUN JVM. If you use Apache ServiceMix or Apache Karaf, you'll need to adjust the etc/jre.properties file, to add sun.net.spi.nameservice to the list of Java platform packages exported. The server will need restarting before this change takes effect.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-dns</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

The URI scheme for a DNS component is as follows
dns://operation
Copy to Clipboard Toggle word wrap
This component only supports producers.

Options

None.

Headers

Expand
Header Type Operations Description
dns.domain String ip The domain name. Mandatory.
dns.name String lookup The name to lookup. Mandatory.
dns.type - lookup, dig The type of the lookup. Should match the values of org.xbill.dns.Type. Optional.
dns.class - lookup, dig he DNS class of the lookup. Should match the values of org.xbill.dns.DClass. Optional.
dns.query String dig The query itself. Mandatory.
dns.server String dig The server in particular for the query. If none is given, the default one specified by the OS will be used. Optional.

Examples

IP lookup

        <route id="IPCheck">
            <from uri="direct:start"/>
            <to uri="dns:ip"/>
        </route>
Copy to Clipboard Toggle word wrap
This looks up a domain's IP. For example, www.example.com resolves to 192.0.32.10. The IP address to lookup must be provided in the header with key "dns.domain".

DNS lookup

        <route id="IPCheck">
            <from uri="direct:start"/>
            <to uri="dns:lookup"/>
        </route>
Copy to Clipboard Toggle word wrap
This returns a set of DNS records associated with a domain. The name to lookup must be provided in the header with key "dns.name".

DNS Dig

Dig is a Unix command-line utility to run DNS queries.
        <route id="IPCheck">
            <from uri="direct:start"/>
            <to uri="dns:dig"/>
        </route>
Copy to Clipboard Toggle word wrap
The query must be provided in the header with key "dns.query".

Chapter 35. Docker

Docker Component

Available as of Camel 2.15
Camel component for communicating with Docker.
The Docker Camel component leverages the docker-java via the Docker Remote API.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-docker</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

docker://[operation]?[options]
Copy to Clipboard Toggle word wrap
Where operation is the specific action to perform on Docker.

Header Strategy

All URI option can be passed as Header properties. Values found in a message header take precedence over URI parameters. A header property takes the form of a URI option prefixed with *CamelDocker* as shown below
Expand
URI Option Header Property
containerId CamelDockerContainerId

General Options

The following parameters can be used with any invocation of the component
Expand
Option Header Description Default Value
host CamelDockerHost Mandatory: Docker host localhost
port CamelDockerPort Mandatory:Docker port 2375
username CamelDockerUserName User name to authenticate with
password CamelDockerPassword Password to authenticate with
email CamelDockerEmail Email address associated with the user
secure CamelDockerSecure Use HTTPS communication false
requestTimeout CamelDockerRequestTimeout Request timeout for response (in seconds) 30
certPath CamelDockerCertPath Location containing the SSL certificate chain

Consumer Operations

The consumer supports the following operations.
Expand
Operation Options Description Produces
events initialRange Monitor Docker events (Streaming) Event

Producer Operations

The following producer operations are available.
Expand
Misc Operation Options Description Returns
auth Check auth configuration
info System wide information Info
ping Ping the Docker server
version Show the docker version information Version
Expand
Image Operation Options Description Body Content Returns
image/list filter, showAll List images List<Image>
image/create repository Create an image InputStream CreateImageResponse
image/build noCache, quiet, remove, tag Build an image from Dockerfile via stdin InputStream or File InputStream
image/pull repository, registry, tag Pull an image from the registry InputStream
image/push name Push an image on the registry InputStream
image/search term Search for images List<SearchItem>
image/remove imageId Remove an image
image/tag imageId, repository, tag, force Tag an image into a repository
image/inspect imageId Inspect an image InspectImageResponse
Expand
Container Operation Options Description Body Content Returns
container/list showSize, showAll, before, since, limit, List containers initialRange List<Container>
container/create imageId, name, exposedPorts, workingDir, disableNetwork, hostname, user, tty, stdInOpen, stdInOnce, memoryLimit, memorySwap, cpuShares, attachStdIn, attachStdOut, attachStdErr, env, cmd, dns, image, volumes, volumesFrom Create a container CreateContainerResponse
container/start
containerId, binds, links, lxcConf, portBindings, privileged, publishAllPorts, dns, dnsSearch, volumesFrom, networkMode, devices, restartPolicy, capAdd, capDrop
Start a container
container/inspect containerId Inspect a container InspectContainerResponse
container/wait containerId Wait a container Integer
container/log containerId, stdOut, stdErr, timestamps, followStream, tailAll, tail Get container logs InputStream
container/attach containerId, stdOut, stdErr, timestamps, logs, followStream Attach to a container InputStream
container/stop containerId, timeout Stop a container
container/restart containerId, timeout Restart a container
container/diff containerId Inspect changes on a container ChangeLog
container/kill containerId, signal Kill a container
container/top containerId, psArgs List processes running in a container TopContainerResponse
container/pause containerId Pause a container
container/unpause containerId Unpause a container
container/commit containerId, repository, message, tag, attachStdIn, attachStdOut, attachStdErr, cmd, disableNetwork, pause, env, exposedPorts, hostname, memory, memorySwap, openStdIn, portSpecs, stdInOnce, tty, user, volumes, hostname Create a new image from a container's changes String
container/copyfile containerId, resource, hostPath Copy files or folders from a container InputStream
container/remove containerId, force, removeVolumes Remove a container

Examples

The following example consumes events from Docker:
from("docker://events?host=192.168.59.103&port=2375").to("log:event");
Copy to Clipboard Toggle word wrap
The following example queries Docker for system wide information
from("docker://info?host=192.168.59.103&port=2375").to("log:info");
Copy to Clipboard Toggle word wrap

Chapter 36. Dozer

Dozer Component

The dozer: component provides the ability to map between Java beans using the Dozer mapping framework. Camel also supports the ability to trigger Dozer mappings as a type converter. The primary differences between using a Dozer endpoint and a Dozer converter are:
  • The ability to manage Dozer mapping configuration on a per-endpoint basis vs. global configuration via the converter registry.
  • A Dozer endpoint can be configured to marshal/unmarshal input and output data using Camel data formats to support a single, any-to-any transformation endpoint
  • The Dozer component allows for fine-grained integration and extension of Dozer to support additional functionality (e.g. mapping literal values, using expressions for mappings, etc.).
In order to use the Dozer component, Maven users will need to add the following dependency to their pom.xml:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-dozer</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

The Dozer component only supports producer endpoints.
dozer:endpointId[?options]
Copy to Clipboard Toggle word wrap
Where endpointId is a name used to uniquely identify the Dozer endpoint configuration.
An example Dozer endpoint URI:
from("direct:orderInput").
  to("dozer:transformOrder?mappingFile=orderMapping.xml&targetModel=example.XYZOrder").
  to("direct:orderOutput");
Copy to Clipboard Toggle word wrap

Options

Expand
Name
Default
Description
mappingFile
dozerBeanMapping.xml
The location of a Dozer configuration file. The file is loaded from the classpath by default, but you can use file:, classpath:, or http: to load the configuration from a specific location.
unmarshalId
none
The id of a dataFormat defined within the Camel Context to use for unmarshalling the mapping input from a non-Java type.
marshalId
none
The id of a dataFormat defined within the Camel Context to use for marshalling the mapping output to a non-Java type.
sourceModel
none
Fully-qualified class name for the source type used in the mapping. If specified, the input to the mapping is converted to the specified type before being mapped with Dozer.
targetModel
none
Fully-qualified class name for the target type used in the mapping. This option is required.
mappingConfiguration none The name of a DozerBeanMapperConfiguration bean in the Camel registry which should be used for configuring the Dozer mapping. This is an alternative to the mappingFile option that can be used for fine-grained control over how Dozer is configured. Remember to use a "#" prefix in the value to indicate that the bean is in the Camel registry (e.g. "#myDozerConfig").

Using Data Formats with Dozer

Dozer does not support non-Java sources and targets for mappings, so it cannot, for example, map an XML document to a Java object on its own. Luckily, Camel has extensive support for marshalling between Java and a wide variety of formats using data formats. The Dozer component takes advantage of this support by allowing you to specify that input and output data should be passed through a data format prior to processing via Dozer. You can always do this on your own outside the call to Dozer, but supporting it directly in the Dozer component allows you to use a single endpoints to configure any-to-any transformation within Camel.
As an example, let's say you wanted to map between an XML data structure and a JSON data structure using the Dozer component. If you had the following data formats defined in a Camel Context:
<dataFormats>
  <json library="Jackson" id="myjson"/>
  <jaxb contextPath="org.example" id="myjaxb"/>
</dataFormats>
Copy to Clipboard Toggle word wrap
You could then configure a Dozer endpoint to unmarshal the input XML using a JAXB data format and marshal the mapping output using Jackson.
<endpoint uri="dozer:xml2json?marshalId=myjson&amp;unmarshalId=myjaxb&amp;targetModel=org.example.Order"/>
Copy to Clipboard Toggle word wrap

Configuring Dozer

All Dozer endpoints require a Dozer mapping configuration file which defines mappings between source and target objects. The component will default to a location of META-INF/dozerBeanMapping.xml if the mappingFile or mappingConfiguration options are not specified on an endpoint. If you need to supply multiple mapping configuration files for a single endpoint or specify additional configuration options (e.g. event listeners, custom converters, etc.), then you can use an instance of org.apache.camel.converter.dozer.DozerBeanMapperConfiguration.
<bean id="mapper" class="org.apache.camel.converter.dozer.DozerBeanMapperConfiguration">  
  <property name="mappingFiles">
    <list>
      <value>mapping1.xml</value>
      <value>mapping2.xml</value>
    </list>
  </property>
</bean>
Copy to Clipboard Toggle word wrap

Mapping Extensions

The Dozer component implements a number of extensions to the Dozer mapping framework as custom converters. These converters implement mapping functions that are not supported directly by Dozer itself.

Variable Mappings

Variable mappings allow you to map the value of a variable definition within a Dozer configuration into a target field instead of using the value of a source field. This is equivalent to constant mapping in other mapping frameworks, where can you assign a literal value to a target field. To use a variable mapping, simply define a variable within your mapping configuration and then map from the VariableMapper class into your target field of choice:
<mappings xmlns="http://dozer.sourceforge.net" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://dozer.sourceforge.net http://dozer.sourceforge.net/schema/beanmapping.xsd">
  <configuration>
    <variables>
      <variable name="CUST_ID">ACME-SALES</variable>
    </variables>
  </configuration>
  <mapping>
    <class-a>org.apache.camel.component.dozer.VariableMapper</class-a>
    <class-b>org.example.Order</class-b>
    <field custom-converter-id="_variableMapping" custom-converter-param="${CUST_ID}">
      <a>literal</a>
      <b>custId</b>
    </field>
  </mapping>
</mappings>
Copy to Clipboard Toggle word wrap

Custom Mappings

Custom mappings allow you to define your own logic for how a source field is mapped to a target field. They are similar in function to Dozer customer converters, with two notable differences:
  • You can have multiple converter methods in a single class with custom mappings.
  • There is no requirement to implement a Dozer-specific interface with custom mappings.
A custom mapping is declared by using the built-in '_customMapping' converter in your mapping configuration. The parameter to this converter has the following syntax:
[class-name][,method-name]
Copy to Clipboard Toggle word wrap
Method name is optional - the Dozer component will search for a method that matches the input and output types required for a mapping. An example custom mapping and configuration are provided below.
public class CustomMapper {
    // All customer ids must be wrapped in "[ ]"
    public Object mapCustomer(String customerId) {
        return "[" + customerId + "]";
    }
}
Copy to Clipboard Toggle word wrap
<mappings xmlns="http://dozer.sourceforge.net" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://dozer.sourceforge.net http://dozer.sourceforge.net/schema/beanmapping.xsd">
  <mapping>
    <class-a>org.example.A</class-a>
    <class-b>org.example.B</class-b>
    <field custom-converter-id="_customMapping" 
	    custom-converter-param="org.example.CustomMapper,mapCustomer">
      <a>header.customerNum</a>
      <b>custId</b>
    </field>
  </mapping>
</mappings>
Copy to Clipboard Toggle word wrap

Expression Mappings

Expression mappings allow you to use the powerful language capabilities of Camel to evaluate an expression and assign the result to a target field in a mapping. Any language that Camel supports can be used in an expression mapping. Basic examples of expressions include the ability to map a Camel message header or exchange property to a target field or to concatenate multiple source fields into a target field. The syntax of a mapping expression is:
[language]:[expression]
Copy to Clipboard Toggle word wrap
An example of mapping a message header into a target field:
<mappings xmlns="http://dozer.sourceforge.net" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://dozer.sourceforge.net http://dozer.sourceforge.net/schema/beanmapping.xsd">
  <mapping>
    <class-a>org.apache.camel.component.dozer.ExpressionMapper</class-a>
    <class-b>org.example.B</class-b>
    <field custom-converter-id="_expressionMapping" custom-converter-param="simple:\${header.customerNumber}">
      <a>expression</a>
      <b>custId</b>
    </field>
  </mapping>
</mappings>
Copy to Clipboard Toggle word wrap
Note that any properties within your expression must be escaped with "\" to prevent an error when Dozer attempts to resolve variable values defined using the EL.

Chapter 37. Dropbox

Camel Dropbox component

Available as of Camel 2.14
The dropbox: component allows you to treat Dropbox remote folders as a producer or consumer of messages. Using the Dropbox Java Core API (reference version for this component is 1.7.x), this camel component has the following features:
  • As a consumer, download files and search files by queries
  • As a producer, download files, move files between remote directories, delete files/dir, upload files and search files by queries
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-dropbox</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

dropbox://[operation]?[options]
Copy to Clipboard Toggle word wrap
Where operation is the specific action (typically is a CRUD action) to perform on Dropbox remote folder.

Operation

Expand
Operation
Description
del
deletes files or directories on Dropbox
get
download files from Dropbox
move
move files from folders on Dropbox
put
upload files on Dropbox
search
search files on Dropbox based on string queries
Operations require additional options to work, some are mandatory for the specific operation.

Options

In order to work with Dropbox API you need to obtain an accessToken and a clientIdentifier. You can refer to the Dropbox documentation that expalins how to get them.
Below are listed the mandatory options for all operations:
Expand
Property
Mandatory
Description
accessToken
true
The access token to make API requests for a specific Dropbox user
clientIdentifier
true
Name of the app registered to make API requests

Del operation

Delete files on Dropbox.
Works only as Camel producer.
Below are listed the options for this operation:
Expand
Property
Mandatory
Description
remotePath
true
Folder or file to delete on Dropbox

Samples

from("direct:start").to("dropbox://del?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1").to("mock:result");
from("direct:start").to("dropbox://del?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1/file1.tar.gz").to("mock:result");

Result Message Headers

The following headers are set on message result:
Expand
Property
Value
DELETED_PATH
name of the path deleted on dropbox

Result Message Body

The following objects are set on message body result:
Expand
Object type
Description
String
name of the path deleted on dropbox

Get (download) operation

Download files from Dropbox.
Works as Camel producer or Camel consumer.
Below are listed the options for this operation:
Expand
Property
Mandatory
Description
remotePath
true
Folder or file to download from Dropbox

Samples

from("direct:start").to("dropbox://get?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1/file1.tar.gz").to("file:///home/kermit/?fileName=file1.tar.gz");
from("direct:start").to("dropbox://get?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1").to("mock:result");
from("dropbox://get?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1").to("file:///home/kermit/");

Result Message Headers

The following headers are set on message result:
Expand
Property
Value
DOWNLOADED_FILE
in case of single file download, path of the remote file downloaded
DOWNLOADED_FILES
in case of multiple files download, path of the remote files downloaded

Result Message Body

The following objects are set on message body result:
Expand
Object type
Description
ByteArrayOutputStream
in case of single file download, stream representing the file downloaded
Map<String, ByteArrayOutputStream>
in case of multiple files download, a map with as key the path of the remote file downloaded and as value the stream representing the file downloaded

Move operation

Move files on Dropbox between one folder to another.
Works only as Camel producer.
Below are listed the options for this operation:
Expand
Property
Mandatory
Description
remotePath
true
Original file or folder to move
newRemotePath
true
Destination file or folder

Samples

from("direct:start").to("dropbox://move?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1&newRemotePath=/root/folder2").to("mock:result");

Result Message Headers

The following headers are set on message result:
Expand
Property
Value
MOVED_PATH
name of the path moved on dropbox

Result Message Body

The following objects are set on message body result:
Expand
Object type
Description
String
name of the path moved on dropbox

Put (upload) operation

Upload files on Dropbox.
Works as Camel producer.
Below are listed the options for this operation:
Expand
Property
Mandatory
Description
uploadMode
true
add or force this option specifies how a file should be saved on dropbox: in case of "add" the new file will be renamed if a file with the same name already exists on dropbox. in case of "force" if a file with the same name already exists on dropbox, this will be overwritten.
localPath
true
Folder or file to upload on Dropbox from the local filesystem .
remotePath
false
Folder destination on Dropbox. If the property is not set, the component will upload the file on a remote path equal to the local path.

Samples

from("direct:start").to("dropbox://put?accessToken=XXX&clientIdentifier=XXX&uploadMode=add&localPath=/root/folder1").to("mock:result");
from("direct:start").to("dropbox://put?accessToken=XXX&clientIdentifier=XXX&uploadMode=add&localPath=/root/folder1&remotePath=/root/folder2").to("mock:result");

Result Message Headers

The following headers are set on message result:
Expand
Property
Value
UPLOADED_FILE
in case of single file upload, path of the remote path uploaded
UPLOADED_FILES
in case of multiple files upload, string with the remote paths uploaded

Result Message Body

The following objects are set on message body result:
Expand
Object type
Description
String
in case of single file upload, result of the upload operation, OK or KO
Map<String, DropboxResultCode>
in case of multiple files upload, a map with as key the path of the remote file uploaded and as value the result of the upload operation, OK or KO

Search operation

Search inside a remote Dropbox folder including its sub directories.
Works as Camel producer and as Camel consumer.
Below are listed the options for this operation:
Expand
Property
Mandatory
Description
remotePath
true
Folder on Dropbox where to search in.
query
false
A space-separated list of substrings to search for. A file matches only if it contains all the substrings. If this option is not set, all files will be matched.

Samples

from("dropbox://search?accessToken=XXX&clientIdentifier=XXX&remotePath=/XXX&query=XXX").to("mock:result");
from("direct:start").to("dropbox://search?accessToken=XXX&clientIdentifier=XXX&remotePath=/XXX").to("mock:result");

Result Message Headers

The following headers are set on message result:
Expand
Property
Value
FOUNDED_FILES
list of file path founded

Result Message Body

The following objects are set on message body result:
Expand
Object type
Description
List<DbxEntry>
list of file path founded. For more information on this object refer to Dropbox documentation, http://dropbox.github.io/dropbox-sdk-java/api-docs/v1.7.x/com/dropbox/core/DbxEntry.html

Chapter 38. ElasticSearch

ElasticSearch Component

Available as of Camel 2.11
The ElasticSearch component allows you to interface with an ElasticSearch server.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-elasticsearch</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

elasticsearch://clusterName?[options]
Copy to Clipboard Toggle word wrap
Tip
if you want to run against a local (in JVM/classloader) ElasticSearch server, just set the clusterName value in the URI to local. See the client guide for more details.

Endpoint Options

The following options may be configured on the ElasticSearch endpoint. All are required to be set as either an endpoint URI parameter or as a header (headers override endpoint properties)
Expand
name description
operation required, indicates the operation to perform
indexName
the name of the index to act against
ip
the TransportClient remote host ip to use Camel 2.12

Message Operations

The following ElasticSearch operations are currently supported. Simply set an endpoint URI option or exchange header with a key of operation and a value set to one of the following. Some operations also require other parameters or the message body to be set.
Expand
operation message body description
INDEX Map, String, byte[] or XContentBuilder content to index Adds content to an index and returns the content's indexId in the body.
GET_BY_ID Index ID of content to retrieve Retrieves the specified index and returns a GetResult object in the body.
DELETE Index ID of content to delete Deletes the specified indexId and returns a DeleteResult object in the body.
BULK_INDEX
A List or Collection of any type that is already accepted (XContentBuilder, Map, byte[], or String)
Camel 2.14, Adds content to an index and return a List of the id of the successfully indexed documents in the body.
BULK
A List or Collection of any type that is already accepted (XContentBuilder, Map, byte[], or String)
Camel 2.15, Adds content to an index and returns the BulkResponse object in the body.

Index Example

Below is a simple INDEX example
from("direct:index")
    .to("elasticsearch://local?operation=INDEX&indexName=twitter&indexType=tweet");
Copy to Clipboard Toggle word wrap
<route>
    <from uri="direct:index" />
    <to uri="elasticsearch://local?operation=INDEX&indexName=twitter&indexType=tweet"/>
</route>
Copy to Clipboard Toggle word wrap
A client would simply need to pass a body message containing a Map to the route. The result body contains the indexId created.
Map<String, String> map = new HashMap<String, String>();
map.put("content", "test");
String indexId = template.requestBody("direct:index", map, String.class);
Copy to Clipboard Toggle word wrap

For more information, see these resources

Chapter 39. EventAdmin

EventAdmin component

Available in Camel 2.6
The eventadmin component can be used in an OSGi environment to receive OSGi EventAdmin events and process them.

Dependencies

Maven users need to add the following dependency to their pom.xml
<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-eventadmin</artifactId>
  <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Camel (2.6.0 or higher).

URI format

eventadmin:topic[?options]
Copy to Clipboard Toggle word wrap
where topic is the name of the topic to listen too.

URI options

Expand
Name Default value Description
send false Whether to use 'send' or 'synchronous' deliver. Default false (async delivery)

Message headers

Expand
Name Type Message Description

Message body

The in message body will be set to the received Event.

Example usage

<route>
    <from uri="eventadmin:*"/>
    <to uri="stream:out"/>
</route>
Copy to Clipboard Toggle word wrap

Chapter 40. Exec

Exec component

Available in Apache Camel 2.3
The exec component can be used to execute system commands.

Dependencies

Maven users need to add the following dependency to their pom.xml
<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-exec</artifactId>
  <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Apache Camel (2.3.0 or higher).

URI format

exec://executable[?options]
Copy to Clipboard Toggle word wrap
where executable is the name, or file path, of the system command that will be executed. If executable name is used (e.g. exec:java), the executable must in the system path.

URI options

Expand
Name Default value Description
args null
The arguments of the executable. The arguments may be one or many whitespace-separated tokens, that can be quoted with ", e.g. args="arg 1" arg2 will use two arguments arg 1 and arg2. To include the quotes use "", e.g. args=""arg 1"" arg2 will use the arguments "arg 1" and arg2.
workingDir null The directory in which the command should be executed. If null, the working directory of the current process will be used.
timeout Long.MAX_VALUE The timeout, in milliseconds, after which the executable should be terminated. If execution has has not finished within the timeout, the component will send a termination request.
outFile null The name of a file, created by the executable, that should be considered as its output. If no outFile is set, the standard output (stdout) of the executable will be considered as output.
binding a DefaultExecBinding instance A reference to a org.apache.commons.exec.ExecBinding in the Registry.
commandExecutor a DefaultCommandExecutor instance A reference to a org.apache.commons.exec.ExecCommandExecutor in the Registry, that customizes the command execution. The default command executor utilizes the commons-exec library. It adds a shutdown hook for every executed command.
useStderrOnEmptyStdout false A boolean indicating that when stdout is empty, this component will populate the Camel Message Body with stderr. This behavior is disabled (false) by default.

Message headers

The supported headers are defined in org.apache.camel.component.exec.ExecBinding.
Expand
Name Type Message Description
ExecBinding.EXEC_COMMAND_EXECUTABLE String in The name of the system command that will be executed. Overrides the executable in the URI.
ExecBinding.EXEC_COMMAND_ARGS java.util.List<String> in The arguments of the executable. The arguments are used literally, no quoting is applied. Overrides existing args in the URI.
ExecBinding.EXEC_COMMAND_ARGS String in Camel 2.5: The arguments of the executable as a Single string where each argument is whitespace separated (see args in URI option). The arguments are used literally, no quoting is applied. Overrides existing args in the URI.
ExecBinding.EXEC_COMMAND_OUT_FILE String in The name of a file, created by the executable, that should be considered as output of the executable. Overrides existing outFile in the URI.
ExecBinding.EXEC_COMMAND_TIMEOUT long in The timeout, in milliseconds, after which the executable should be terminated. Overrides any existing timeout in the URI.
ExecBinding.EXEC_COMMAND_WORKING_DIR String in The directory in which the command should be executed. Overrides any existing workingDir in the URI.
ExecBinding.EXEC_EXIT_VALUE int out The value of this header is the exit value of the executable. Non-zero exit values typically indicate abnormal termination. Note that the exit value is OS-dependent.
ExecBinding.EXEC_STDERR java.io.InputStream out The value of this header points to the standard error stream (stderr) of the executable. If no stderr is written, the value is null.
ExecBinding.EXEC_USE_STDERR_ON_EMPTY_STDOUT boolean in Indicates that when stdout is empty, this component will populate the Camel Message Body with stderr. This behavior is disabled (false) by default.

Message body

If the Exec component receives an in message body that is convertible to java.io.InputStream, it is used to feed input to the executable via its stdin. After execution, the message body is the result of the execution, that is, an org.apache.camel.components.exec.ExecResult instance containing the stdout, stderr, exit value, and out file. This component supports the following ExecResult type converters for convenience:
Expand
From To
ExecResult java.io.InputStream
ExecResult String
ExecResult byte []
ExecResult org.w3c.dom.Document

Executing word count (Linux)

The example below executes wc (word count, Linux) to count the words in file /usr/share/dict/words. The word count (output) is written in the standart output stream of wc.
from("direct:exec")
.to("exec:wc?args=--words /usr/share/dict/words")
.process(new Processor() {
     public void process(Exchange exchange) throws Exception {
       // By default, the body is ExecResult instance
       assertIsInstanceOf(ExecResult.class, exchange.getIn().getBody());
       // Use the Camel Exec String type converter to convert the ExecResult to String
       // In this case, the stdout is considered as output
       String wordCountOutput = exchange.getIn().getBody(String.class);
       // do something with the word count
     }
});
Copy to Clipboard Toggle word wrap

Executing java

The example below executes java with 2 arguments: -server and -version, provided that java is in the system path.
from("direct:exec")
.to("exec:java?args=-server -version")
Copy to Clipboard Toggle word wrap
The example below executes java in c:/temp with 3 arguments: -server, -version and the sytem property user.name.
from("direct:exec")
.to("exec:c:/program files/jdk/bin/java?args=-server -version -Duser.name=Camel&workingDir=c:/temp")
Copy to Clipboard Toggle word wrap

Executing Ant scripts

The following example executes Apache Ant (Windows only) with the build file CamelExecBuildFile.xml, provided that ant.bat is in the system path, and that CamelExecBuildFile.xml is in the current directory.
from("direct:exec")
.to("exec:ant.bat?args=-f CamelExecBuildFile.xml")
Copy to Clipboard Toggle word wrap
In the next example, the ant.bat command redirects its output to CamelExecOutFile.txt with -l. The file CamelExecOutFile.txt is used as the out file with outFile=CamelExecOutFile.txt. The example assumes that ant.bat is in the system path, and that CamelExecBuildFile.xml is in the current directory.
from("direct:exec")
.to("exec:ant.bat?args=-f CamelExecBuildFile.xml -l CamelExecOutFile.txt&outFile=CamelExecOutFile.txt")
.process(new Processor() {
     public void process(Exchange exchange) throws Exception {
        InputStream outFile = exchange.getIn().getBody(InputStream.class);
        assertIsInstanceOf(InputStream.class, outFile);
        // do something with the out file here
     }
  });
Copy to Clipboard Toggle word wrap

Executing echo (Windows)

Commands such as echo and dir can be executed only with the command interpreter of the operating system. This example shows how to execute such a command - echo - in Windows.
from("direct:exec").to("exec:cmd?args=/C echo echoString")
Copy to Clipboard Toggle word wrap

Chapter 41. Fabric Component

Abstract

The Fabric component implements a location discovery mechanism for Apache Camel endpoints. This mechanism can also be used to provide load-balancing over a cluster of endpoints. On the client side (producer endpoints), endpoints are represented by an abstract ID and at run time, the ID is resolved to a specific endpoint URI. Because the URI is stored in a distributed registry (provided by Fuse Fabric), this enables you to create flexible applications whose topology can be specified at deploy time and updated dynamically.

Dependencies

The Fabric component can only be used in the context of a fabric-enabled Red Hat JBoss Fuse container. You must ensure that the fabric-camel feature is installed. If necessary, you can install it using the following console command:
karaf@root> features:install fabric-camel
Copy to Clipboard Toggle word wrap
Alternatively, if you decide to use a custom feature to deploy your application, you can ensure that the fabric-camel feature is installed by including it in your feature definition. For example:
<?xml version="1.0" encoding="UTF-8"?>
<features>
    <feature name="fabric-component-example">
        <feature>fabric-camel</feature>
        <bundle>URIforMyBundle</bundle>
        <!-- Specify any other required bundles or features -->
        ...
    </feature>
</features>
Copy to Clipboard Toggle word wrap
For more details about features, see Deploying Features.

URI format

A fabric endpoint has the following URI format:
fabric:ClusterID[:PublishedURI[?Options]]
Copy to Clipboard Toggle word wrap
The format of the URI depends on whether it is used to specify a consumer endpoint or a producer endpoint.
For a Fabric producer endpoint, the URI format is:
fabric:ClusterID:PublishedURI[?Options]
Copy to Clipboard Toggle word wrap
Where the specified URI, PublishedURI, is published in the fabric registry and associated with the ClusterId cluster. The options, Options, are used when creating the producer endpoint instance, but the options are not published with the PublishedURI in the fabric registry.
For a Fabric consumer endpoint, the URI format is:
fabric:ClusterID
Copy to Clipboard Toggle word wrap
Where the client looks up the ID, ClusterId, in the fabric registry to discover the URI to connect to.

URI options

The Fabric component itself does not support any URI options. It is possible, however, to specify options for the published URI. These options are stored in the fabric registry as part of the URI and are used as follows:
  • Server-only options—options that are applicable only to the server are applied to the server endpoint (consumer endpoint) at run time.
  • Client-only options—options that are applicable only to the client are applied to the client endpoint (producer endpoint) at run time.
  • Common options—options common to the client and the server are applied to both.

Use cases for fabric endpoints

Fabric endpoints essentially provide a discovery mechanism for Apache Camel endpoints. For example, they support the following basic use cases:

Location discovery

Figure 41.1, “Location Discovery through Fabric” gives an overview of how Fabric endpoints enable location discovery at run time.

Figure 41.1. Location Discovery through Fabric

The server side of this application is defined by a route that starts with a Fabric endpoint, where the Fabric endpoint publishes the URI, jetty:http://0.0.0.0:9090. When this route is started, it automatically registers the Jetty URI in the fabric registry, under the cluster ID, foo.
The client side of the application is defined by a route that ends with the Fabric endpoint, fabric:foo. Now, when the client route starts, it automatically looks up the ID, foo, in the fabric registry and retrieves the associated Jetty endpoint URI. The client then creates a producer endpoint using the discovered Jetty URI and connects to the corresponding server port.

Load-balancing cluster

Figure 41.2, “Load Balancing through Fabric” gives an overview of how Fabric endpoints enable you to create a load-balancing cluster.

Figure 41.2. Load Balancing through Fabric

In this case, two Jetty servers are created, with the URIs, jetty:http://0.0.0.0:9090 and jetty:http://0.0.0.0:9191. Because these published URIs are both prefixed by fabric:foo:, both of the Jetty URIs are registered under the same cluster ID, foo, in the fabric registry.
Now, when the client routes starts, it automatically looks up the ID, foo, in the fabric registry. Because the foo ID is associated with multiple endpoint URIs, fabric implements a random load balancing algorithm to choose one of the available URIs. The client then creates a producer endpoint, using the chosen URI.

Auto-reconnect feature

Fabric endpoints support auto-reconnection. So, if a client endpoint (producer endpoint) loses its connection to a server endpoint, it will automatically go back to the fabric registry, ask for another URI, and then connect to the new URI.

Publishing an endpoint URI

To publish an endpoint URI, PublishedURI, in the fabric registry, define a fabric endpoint with the publisher syntax, FabricScheme:ClusterID:PublishedURI. Note that this syntax can only be used in a consumer endpoint (that is, an endpoint that appears in a from DSL command).
Example 41.1, “Publishing a URI ” shows a route that implements a Jetty HTTP server, where the Jetty URI is published to the fabric registry under the ID, cluster. The route is a simply HTTP server that returns the constant message, Response from Zookeeper agent, in the body of the HTTP response.

Example 41.1. Publishing a URI

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="
           http://www.osgi.org/xmlns/blueprint/v1.0.0
           http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd">

 <bean id="fabric-camel" class="io.fabric8.camel.FabricComponent"/>

    <camelContext id="camel" trace="false" xmlns="http://camel.apache.org/schema/blueprint">
        <route id="fabric-server">
            <from uri="fabric-camel:cluster:jetty:http://0.0.0.0:9090/fabric"/>
            <log message="Request received : ${body}"/>
            <setHeader headerName="karaf.name">
                <simple>${sys.karaf.name}</simple>
            </setHeader>
            <transform>
                <simple>Response from Zookeeper agent</simple>
            </transform>
        </route>
    </camelContext>

</blueprint>
Copy to Clipboard Toggle word wrap
Note the following points about the preceding sample:
  • The Fabric component uses the CuratorFramework object to connect to the ZooKeeper server (Fabric registry), where the reference to the CuratorFramework object is provided automatically.
  • The from DSL command defines the fabric URI, fabric-camel:cluster:jetty:http://0.0.0.0:9090/fabric. At run time, this causes two things to happen:
    • The specified jetty URI is published to the fabric registry under the cluster ID, cluster.
    • The Jetty endpoint is activated and used as the consumer endpoint of the route (just as if it had been specified without the fabric-camel:cluster: prefix).
Because the route is implemented in blueprint XML, you would normally add the file containing this code to the src/main/resources/OSGI-INF/blueprint directory of a Maven project.

Looking up an endpoint URI

To look up a URI in the fabric registry, simply specify the fabric endpoint URI with an ID, in the format, FabricScheme:ClusterID. This syntax is used in a producer endpoint (for example, an endpoint that appears in a to DSL command).
Example 41.2, “Looking up a URI” shows a route that implements a HTTP client, where the HTTP endpoint is discovered dynamically at run time, by looking up the specified ID, cluster, in the fabric registry.

Example 41.2. Looking up a URI

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="
           http://www.osgi.org/xmlns/blueprint/v1.0.0
           http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd">

 <bean id="fabric-camel" class="io.fabric8.camel.FabricComponent"/>

  <camelContext id="camel" trace="false" xmlns="http://camel.apache.org/schema/blueprint">

    <route id="fabric-client">
      <from uri="timer://foo?fixedRate=true&amp;period=10000"/>
      <setBody>
          <simple>Hello from Zookeeper server</simple>
      </setBody>
      <to uri="fabric-camel:cluster"/>
      <log message=">>> ${body} : ${header.karaf.name}"/>
    </route>

  </camelContext>

  <reference interface="org.apache.camel.spi.ComponentResolver"
              filter="(component=jetty)"/>

</blueprint>
Copy to Clipboard Toggle word wrap
Because the route is implemented in blueprint XML, you would normally add the file containing this code to the src/main/resources/OSGI-INF/blueprint directory of a Maven project.

Load-balancing example

In principle, implementing load balancing is easy using fabric endpoints. All that you have to do is to publish more than one endpoint URI under the same cluster ID. Now, when a client looks up that cluster ID, it gets a random selection out of the list of available endpoint URIs.
The servers in the load-balancing cluster have almost the same configuration. Essentially, the only difference between them is that they publish an endpoint URI with a different hostname and/or IP port. Instead of creating a separate OSGi bundle for every single server in the load-balancing cluster, however, it is better to define a template that enables you to specify the host or port using a configuration variable.
Example 41.3, “Server Template for a Load-Balancing Cluster” illustrates the template approach to defining servers in a load-balancing cluster.

Example 41.3. Server Template for a Load-Balancing Cluster

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.0.0"
           xsi:schemaLocation="
           http://www.osgi.org/xmlns/blueprint/v1.0.0
           http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd">

    <!-- osgi blueprint property placeholder -->
    <cm:property-placeholder
        id="myConfig"
        persistent-id="io.fabric8.examples.camel.loadbalancing.server"/>

    <bean id="fabric-camel" class="io.fabric8.camel.FabricComponent"/>

    <camelContext id="camel" trace="false" xmlns="http://camel.apache.org/schema/blueprint">
        <!-- using Camel properties component and refer
             to the blueprint property placeholder by its id -->
        <propertyPlaceholder id="properties"
                             location="blueprint:myConfig"
                             prefixToken="[[" suffixToken="]]"/>

        <route id="fabric-server">
            <from uri="fabric-camel:cluster:jetty:http://0.0.0.0:[[portNumber]]/fabric"/>
            <log message="Request received : ${body}"/>
            <setHeader headerName="karaf.name">
                <simple>${sys.karaf.name}</simple>
            </setHeader>
            <transform>
                <simple>Response from Zookeeper agent</simple>
            </transform>
        </route>
    </camelContext>

</blueprint>
Copy to Clipboard Toggle word wrap
First of all, you need to initialize the OSGi blueprint property placeholder. The property placeholder mechanism enables you to read property settings from the OSGi Config Admin service and substitute the properties in the blueprint configuration file. In this example, the property placeholder accesses properties from the io.fabric8.examples.camel.loadbalancing.server persistent ID. A persistent ID in the OSGi Config Admin service identifies a collection of related property settings. After initializing the property placeholder, you can access any property values from the persistent ID using the syntax, [[PropName]].
The Fabric endpont URI exploits the property placeholder mechanism to substitute the value of the Jetty port, [[portNumber]], at run time. At deploy time, you can specify the value of the portName property. For example, if using a custom feature, you could specify the property in the feature definition (see Add OSGi configurations to the feature). Alternatively, you can specify configuration properties when defining deployment profiles in the Fuse Management Console.

OSGi bundle plug-in configuration

When defining an OSGi bundle that uses Fabric endpoints, the Import-Package bundle header must be configured to import the following Java packages:
io.fabric8.zookeeper
Copy to Clipboard Toggle word wrap
For example, assuming that you use Maven to build your application, Example 41.4, “Maven Bundle Plug-In Configuration” shows how you can configure the Maven bundle plug-in to import the required packages.

Example 41.4. Maven Bundle Plug-In Configuration

<project ... >
  ...
  <build>
    <defaultGoal>install</defaultGoal>
    <plugins>
      ...
      <plugin>
        <groupId>org.apache.felix</groupId>
        <artifactId>maven-bundle-plugin</artifactId>
        <extensions>true</extensions>
        <configuration>
          <instructions>
            <Bundle-SymbolicName>${project.groupId}.${project.artifactId}</Bundle-SymbolicName>
            <Import-Package>
              io.fabric8.zookeeper,
              *
            </Import-Package>
          </instructions>
        </configuration>
      </plugin>
    </plugins>
  </build>
  ...
</project>
Copy to Clipboard Toggle word wrap

Chapter 42. Facebook

Facebook Component

Available as of Camel 2.12
The Facebook component provides access to all of the Facebook APIs accessible using Facebook4J. It allows producing messages to retrieve, add, and delete posts, likes, comments, photos, albums, videos, photos, checkins, locations, links, etc. It also supports APIs that allow polling for posts, users, checkins, groups, locations, etc.
Facebook requires the use of OAuth for all client application authentication. In order to use camel-facebook with your account, you'll need to create a new application within Facebook at https://developers.facebook.com/apps and grant the application access to your account. The Facebook application's id and secret will allow access to Facebook APIs which do not require a current user. A user access token is required for APIs that require a logged in user. More information on obtaining a user access token can be found at https://developers.facebook.com/docs/facebook-login/access-tokens/.
Maven users will need to add the following dependency to their pom.xml for this component:
	<dependency>
    	<groupId>org.apache.camel</groupId>
    	<artifactId>camel-facebook</artifactId>
    	<version>${camel-version}</version>
	</dependency>
Copy to Clipboard Toggle word wrap

URI format

facebook://[endpoint]?[options]
Copy to Clipboard Toggle word wrap

FacebookComponent

The facebook component can be configured with the Facebook account settings below, which are mandatory. The values can be provided to the component using the bean property configuration of type org.apache.camel.component.facebook.config.FacebookConfiguration. The oAuthAccessToken option may be ommited but that will only allow access to application APIs.
You can also configure these options directly in an endpoint URI.
Expand
Option Description
oAuthAppId The application Id
oAuthAppSecret The application Secret
oAuthAccessToken The user access token
In addition to the above settings, non-mandatory options below can be used to configure the underlying Facebook4J runtime through either the component's configuration property or in an endpoint URI.
Expand
Option Description Default Value
oAuthAuthorizationURL OAuth authorization URL https://www.facebook.com/dialog/oauth
oAuthPermissions Default OAuth permissions. Comma separeted permission names. See https://developers.facebook.com/docs/reference/login/#permissions for the detail null
oAuthAccessTokenURL OAuth access token URL https://graph.facebook.com/oauth/access_token
debugEnabled Enables deubg output. Effective only with the embedded logger false
gzipEnabled Use Facebook GZIP encoding true
httpConnectionTimeout Http connection timeout in milliseconds 20000
httpDefaultMaxPerRoute HTTP maximum connections per route 2
httpMaxTotalConnections HTTP maximum total connections 20
httpProxyHost HTTP proxy server host name null
httpProxyPassword HTTP proxy server password null
httpProxyPort HTTP proxy server port null
httpProxyUser HTTP proxy server user name null
httpReadTimeout Http read timeout in milliseconds 120000
httpRetryCount Number of HTTP retries 0
httpRetryIntervalSeconds HTTP retry interval in seconds 5
httpStreamingReadTimeout HTTP streaming read timeout in milliseconds 40000
jsonStoreEnabled If set to true, raw JSON forms will be stored in DataObjectFactory false
mbeanEnabled If set to true, Facebook4J mbean will be registerd false
prettyDebugEnabled prettify JSON debug output if set to true false
restBaseURL API base URL https://graph.facebook.com/
useSSL Use SSL true
videoBaseURL Video API base URL https://graph-video.facebook.com/
clientURL Facebook4J API client URL http://facebook4j.org/en/facebook4j-<ersion>xml
clientVersion Facebook4J client API version 1.1.12

Producer Endpoints:

Producer endpoints can use endpoint names and options from the table below. Endpoints can also use the short name without the get or search prefix, except checkin due to ambiguity between getCheckin and searchCheckin. Endpoint options that are not mandatory are denoted by [].
Producer endpoints can also use a special option *inBody* that in turn should contain the name of the endpoint option whose value will be contained in the Camel Exchange In message. For example, the facebook endpoint in the following route retrieves activities for the user id value in the incoming message body.
from("direct:test").to("facebook://activities?inBody=userId")...
Copy to Clipboard Toggle word wrap
Any of the endpoint options can be provided in either the endpoint URI, or dynamically in a message header. The message header name must be of the format CamelFacebook.option. For example, the userId option value in the previous route could alternately be provided in the message header CamelFacebook.userId. Note that the inBody option overrides message header, e.g. the endpoint option inBody=user would override a CamelFacebook.userId header.
Endpoints that return a String return an Id for the created or modified entity, e.g. addAlbumPhoto returns the new album Id. Endpoints that return a boolean, return true for success and false otherwise. In case of Facebook API errors the endpoint will throw a RuntimeCamelException with a facebook4j.FacebookException cause.
Expand
Endpoint Short Name Options Body Type
Accounts
getAccounts accounts [reading],[userId] facebook4j.ResponseList<acebook4j.Account>
Activities
getActivities activities [reading],[userId] facebook4j.ResponseList<acebook4j.Activity>
Albums
addAlbumPhoto addAlbumPhoto albumId,source,[message] String
commentAlbum commentAlbum albumId,message String
createAlbum createAlbum albumCreate,[userId] String
getAlbum album albumId,[reading] facebook.Album
getAlbumComments albumComments albumId,[reading] facebook4j.ResponseList<acebook4j.Comment>
getAlbumCoverPhoto albumCoverPhoto albumId java.net.URL
getAlbumLikes albumLikes albumId,[reading] facebook4j.ResponseList<acebook4j.Like>
getAlbumPhotos albumPhotos albumId,[reading] facebook4j.ResponseList<acebook4j.Photos>
getAlbums albums [reading],[userId] facebook4j.ResponseList<acebook4j.Album>
likeAlbum likeAlbum albumId boolean
unlikeAlbum unlikeAlbum albumId boolean
Checkins
checkin checkin checkinCreate,[userId] String
commentCheckin commentCheckin checkinId,message String
getCheckin checkin checkinId,[reading] facebook4j.Checkin
getCheckinComments checkinComments checkinId,[reading] facebook4j.ResponseList<acebook4j.Comment>
getCheckinLikes checkinLikes checkinId,[reading] facebook4j.ResponseList<acebook4j.Like>
getCheckins checkins [reading],[userId] facebook4j.ResponseList<acebook4j.Checkin>
likeCheckin likeCheckin checkinId boolean
unlikeCheckin unlikeCheckin checkinId boolean
Comments
deleteComment deleteComment commentId boolean
getComment comment commentId facebook4j.Comment
getCommentLikes commentLikes commentId,[reading] facebook4j.ResponseList<acebook4j.Like>
likeComment likeComment commentId boolean
unlikeComment unlikeComment commentId boolean
Domains
getDomain domain domainId facebook4j.Domain
getDomainByName domainByName domainName facebook4j.Domain
getDomainsByName domainsByName domainNames java.util.List<acebook4j.Domain>
Events
createEvent createEvent eventUpdate,[userId] String
deleteEvent deleteEvent eventId boolean
deleteEventPicture deleteEventPicture eventId boolean
editEvent editEvent eventId,eventUpdate boolean
getEvent event eventId,[reading] facebook4j.Event
getEventFeed eventFeed eventId,[reading] facebook4j.ResponseList<acebook4j.Post>
getEventPhotos eventPhotos eventId,[reading] facebook4j.ResponseList<acebook4j.Photo>
getEventPictureURL eventPictureURL eventId,[size] java.net.URL
getEvents events [reading],[userId] facebook4j.ResponseList<acebook4j.Event>
getEventVideos eventVideos eventId,[reading] facebook4j.ResponseList<acebook4j.Video>
getRSVPStatusAsInvited rSVPStatusAsInvited eventId,[userId] facebook4j.ResponseList<acebook4j.RSVPStatus>
getRSVPStatusAsNoreply rSVPStatusAsNoreply eventId,[userId] facebook4j.ResponseList<acebook4j.RSVPStatus>
getRSVPStatusInAttending rSVPStatusInAttending eventId,[userId] facebook4j.ResponseList<acebook4j.RSVPStatus>
getRSVPStatusInDeclined rSVPStatusInDeclined eventId,[userId] facebook4j.ResponseList<acebook4j.RSVPStatus>
getRSVPStatusInMaybe rSVPStatusInMaybe eventId,[userId] facebook4j.ResponseList<acebook4j.RSVPStatus>
inviteToEvent inviteToEvent eventId,[userId],[userIds] boolean
postEventFeed postEventFeed eventId,postUpdate String
postEventLink postEventLink eventId,link,[message] String
postEventPhoto postEventPhoto eventId,source,[message] String
postEventStatusMessage postEventStatusMessage eventId,message String
postEventVideo postEventVideo eventId,source,[title,description] String
rsvpEventAsAttending rsvpEventAsAttending eventId boolean
rsvpEventAsDeclined rsvpEventAsDeclined eventId boolean
rsvpEventAsMaybe rsvpEventAsMaybe eventId boolean
uninviteFromEvent uninviteFromEvent eventId,userId boolean
updateEventPicture updateEventPicture eventId,source boolean
Family
getFamily family [reading],[userId] facebook4j.ResponseList<acebook4j.Family>
Favorites
getBooks books [reading],[userId] facebook4j.ResponseList<acebook4j.Book>
getGames games [reading],[userId] facebook4j.ResponseList<acebook4j.Game>
getInterests interests [reading],[userId] facebook4j.ResponseList<acebook4j.Interest>
getMovies movies [reading],[userId] facebook4j.ResponseList<acebook4j.Movie>
getMusic music [reading],[userId] facebook4j.ResponseList<acebook4j.Music>
getTelevision television [reading],[userId] facebook4j.ResponseList<acebook4j.Television>
Facebook Query Language (FQL)
executeFQL executeFQL query,[locale] facebook4j.internal.org.json.JSONArray
executeMultiFQL executeMultiFQL queries,[locale] java.util.Map<tring,facebook4j.internal.org.json.JSONArray>
Friends
addFriendlistMember addFriendlistMember friendlistId,userId boolean
createFriendlist createFriendlist friendlistName,[userId] String
deleteFriendlist deleteFriendlist friendlistId boolean
getBelongsFriend belongsFriend friendId,[reading],[userId] facebook4j.ResponseList<acebook4j.Friend>
getFriendlist friendlist friendlistId,[reading] facebook4j.FriendList
getFriendlistMembers friendlistMembers friendlistId facebook4j.ResponseList<acebook4j.Friend>
getFriendlists friendlists [reading],[userId] facebook4j.ResponseList<acebook4j.FriendList>
getFriendRequests friendRequests [reading],[userId] facebook4j.ResponseList<acebook4j.FriendRequest>
getFriends friends [reading],[userId] facebook4j.ResponseList<acebook4j.Friend>
getMutualFriends mutualFriends [friendUserId],[reading],[userId1,userId2] facebook4j.ResponseList<acebook4j.Friend>
removeFriendlistMember removeFriendlistMember friendlistId,userId boolean
Games
deleteAchievement deleteAchievement achievementURL,[userId] boolean
deleteScore deleteScore [userId] boolean
getAchievements achievements [reading],[userId] facebook4j.ResponseList<acebook4j.Achievement>
getScores scores [reading],[userId] facebook4j.ResponseList<acebook4j.Score>
postAchievement postAchievement achievementURL,[userId] String
postScore postScore scoreValue,[userId] String
Groups
getGroup group groupId,[reading] facebook4j.Group
getGroupDocs groupDocs groupId,[reading] facebook4j.ResponseList<acebook4j.GroupDoc>
getGroupFeed groupFeed groupId,[reading] facebook4j.ResponseList<acebook4j.Post>
getGroupMembers groupMembers groupId,[reading] facebook4j.ResponseList<acebook4j.GroupMember>
getGroupPictureURL groupPictureURL groupId java.net.URL
getGroups groups [reading],[userId] facebook4j.ResponseList<acebook4j.Group>
postGroupFeed postGroupFeed groupId,postUpdate String
postGroupLink postGroupLink groupId,link,[message] String
postGroupStatusMessage postGroupStatusMessage groupId,message String
Insights
getInsights insights objectId,metric,[reading] facebook4j.ResponseList<acebook4j.Insight>
Likes
getUserLikes userLikes [reading],[userId] facebook4j.ResponseList<acebook4j.Like>
Links
commentLink commentLink linkId,message String
getLink link linkId,[reading] facebook4j.Link
getLinkComments linkComments linkId,[reading] facebook4j.ResponseList<acebook4j.Comment>
getLinkLikes linkLikes linkId,[reading] facebook4j.ResponseList<acebook4j.Like>
likeLink likeLink linkId boolean
unlikeLink unlikeLink linkId boolean
Locations
getLocations locations [reading],[userId] facebook4j.ResponseList<acebook4j.Location>
Messages
getInbox inbox [reading],[userId] facebook4j.InboxResponseList<acebook4j.Inbox>
getMessage message messageId,[reading] facebook4j.Message
getOutbox outbox [reading],[userId] facebook4j.ResponseList<acebook4j.Message>
getUpdates updates [reading],[userId] facebook4j.ResponseList<acebook4j.Message>
Notes
commentNote commentNote noteId,message String
createNote createNote subject,message,[userId] String
getNote note noteId,[reading] facebook4j.Note
getNoteComments noteComments noteId,[reading] facebook4j.ResponseList<acebook4j.Comment>
getNoteLikes noteLikes noteId,[reading] facebook4j.ResponseList<acebook4j.Like>
getNotes notes [reading],[userId] facebook4j.ResponseList<acebook4j.Note>
likeNote likeNote noteId boolean
unlikeNote unlikeNote noteId boolean
Notifications
getNotifications notifications [includeRead],[reading],[userId] facebook4j.ResponseList<acebook4j.Notification>
markNotificationAsRead markNotificationAsRead notificationId boolean
Permissions
getPermissions permissions [userId] java.util.List<acebook4j.Permission>
revokePermission revokePermission permissionName,[userId] boolean
Photos
addTagToPhoto addTagToPhoto photoId,[toUserId],[toUserIds],[tagUpdate] boolean
commentPhoto commentPhoto photoId,message String
deletePhoto deletePhoto photoId boolean
getPhoto photo photoId,[reading] facebook4j.Photo
getPhotoComments photoComments photoId,[reading] facebook4j.ResponseList<acebook4j.Comment>
getPhotoLikes photoLikes photoId,[reading] facebook4j.ResponseList<acebook4j.Like>
getPhotos photos [reading],[userId] facebook4j.ResponseList<acebook4j.Photo>
getPhotoURL photoURL photoId java.net.URL
getTagsOnPhoto tagsOnPhoto photoId,[reading] facebook4j.ResponseList<acebook4j.Tag>
likePhoto likePhoto photoId boolean
postPhoto postPhoto source,[message],[place],[noStory],[userId] String
unlikePhoto unlikePhoto photoId boolean
updateTagOnPhoto updateTagOnPhoto photoId,[toUserId],[tagUpdate] boolean
Pokes
getPokes pokes [reading],[userId] facebook4j.ResponseList<acebook4j.Poke>
Posts
commentPost commentPost postId,message String
deletePost deletePost postId boolean
getFeed feed [reading],[userId] facebook4j.ResponseList<acebook4j.Post>
getHome home [reading] facebook4j.ResponseList<acebook4j.Post>
getLinks links [reading],[userId] facebook4j.ResponseList<acebook4j.Link>
getPost post postId,[reading] facebook4j.Post
getPostComments postComments postId,[reading] facebook4j.ResponseList<acebook4j.Comment>
getPostLikes postLikes postId,[reading] facebook4j.ResponseList<acebook4j.Like>
getPosts posts [reading],[userId] facebook4j.ResponseList<acebook4j.Post>
getStatuses statuses [reading],[userId] facebook4j.ResponseList<acebook4j.Post>
getTagged tagged [reading],[userId] facebook4j.ResponseList<acebook4j.Post>
likePost likePost postId boolean
postFeed postFeed postUpdate,[userId] String
postLink postLink link,[message],[userId] String
postStatusMessage postStatusMessage message,[userId] String
unlikePost unlikePost postId boolean
Questions
addQuestionOption addQuestionOption questionId,optionDescription String
createQuestion createQuestion question,[options],[allowNewOptions],[userId] String
deleteQuestion deleteQuestion questionId boolean
getQuestion question questionId,[reading] facebook4j.Question
getQuestionOptions questionOptions questionId,[reading] facebook4j.ResponseList<acebook4j.Question.Option>
getQuestionOptionVotes questionOptionVotes questionId facebook4j.ResponseList<acebook4j.QuestionVotes>
getQuestions questions [reading],[userId] facebook4j.ResponseList<acebook4j.Question>
getSubscribedto subscribedto [reading],[userId] facebook4j.ResponseList<acebook4j.Subscribedto>
getSubscribers subscribers [reading],[userId] facebook4j.ResponseList<acebook4j.Subscriber>
Test Users
createTestUser createTestUser appId,[name],[userLocale],[permissions] facebook4j.TestUser
deleteTestUser deleteTestUser testUserId boolean
getTestUsers testUsers appId java.util.List<acebook4j.TestUser>
makeFriendTestUser makeFriendTestUser testUser1,testUser2 boolean
Users
getMe me [reading] facebook4j.User
getPictureURL pictureURL [size],[userId] java.net.URL
getUser user userId,[reading] facebook4j.User
getUsers users ids java.util.List<acebook4j.User>
Videos
commentVideo commentVideo videoId,message String
getVideo video videoId,[reading] facebook4j.Video
getVideoComments videoComments videoId,[reading] facebook4j.ResponseList<acebook4j.Comment>
getVideoCover videoCover videoId java.net.URL
getVideoLikes videoLikes videoId,[reading] facebook4j.ResponseList<acebook4j.Like>
getVideos videos [reading],[userId] facebook4j.ResponseList<acebook4j.Video>
likeVideo likeVideo videoId boolean
postVideo postVideo source,[title,description],[userId] String
unlikeVideo unlikeVideo videoId boolean
Search
search search query,[reading] facebook4j.ResponseList<acebook4j.internal.org.json.JSONObject>
searchCheckins checkins [reading] facebook4j.ResponseList<acebook4j.Checkin>
searchEvents events query,[reading] facebook4j.ResponseList<acebook4j.Event>
searchGroups groups query,[reading] facebook4j.ResponseList<acebook4j.Group>
searchLocations locations [center,distance],[reading],[placeId] facebook4j.ResponseList<acebook4j.Location>
searchPlaces places query,[reading],[center,distance] facebook4j.ResponseList<acebook4j.Place>
searchPosts posts query,[reading] facebook4j.ResponseList<acebook4j.Post>
searchUsers users query,[reading] facebook4j.ResponseList<acebook4j.User>

Consumer Endpoints:

Any of the producer endpoints that take a reading#reading parameter can be used as a consumer endpoint. The polling consumer uses the since and until fields to get responses within the polling interval. In addition to other reading fields, an initial since value can be provided in the endpoint for the first poll.
Rather than the endpoints returning a List (or facebook4j.ResponseList) through a single route exchange, camel-facebook creates one route exchange per returned object. As an example, if "facebook://home" results in five posts, the route will be executed five times (once for each Post).
  1. URI Options
Expand
Name Type Description
achievementURL java.net.URL The unique URL of the achievement
albumCreate facebook4j.AlbumCreate The facebook Album to be created
albumId String The album ID
allowNewOptions boolean True if allows other users to add new options
appId String The ID of the Facebook Application
center facebook4j.GeoLocation Location latitude and longitude
checkinCreate facebook4j.CheckinCreate The checkin to be created. Deprecated, instead create a Post with an attached location
checkinId String The checkin ID
commentId String The comment ID
description String The description text
distance int Distance in meters
domainId String The domain ID
domainName String The domain name
domainNames String[] The domain names
eventId String The event ID
eventUpdate facebook4j.EventUpdate The event to be created or updated
friendId String The friend ID
friendUserId String The friend user ID
friendlistId String The friend list ID
friendlistName String The friend list Name
groupId String The group ID
ids String[] The ids of users
includeRead boolean Enables notifications that the user has already read in addition to unread ones
link java.net.URL Link URL
linkId String The link ID
locale java.util.Locale Desired FQL locale
message String The message text
messageId String The message ID
metric String The metric name
name String Test user name, must be of the form 'first last'
noStory boolean If set to true, optionally suppresses the feed story that is automatically generated on a user's profile when they upload a photo using your application.
noteId String The note ID
notificationId String The notification ID
objectId String The insight object ID
optionDescription String The question's answer option description
options java.util.List<tring> The question's answer options
permissionName String The permission name
permissions String Test user permissions in the format perm1,perm2,...
photoId String The photo ID
place String The Facebook ID of the place associated with the Photo
placeId String The place ID
postId String The post ID
postUpdate facebook4j.PostUpdate The post to create or update
queries java.util.Map<tring> FQL queries
query String FQL query or search terms for search* endpoints
question String The question text
questionId String The question id
reading facebook4j.Reading Optional reading parameters. See Reading Options(#reading)
scoreValue int The numeric score with value
size facebook4j.PictureSize The picture size, one of large, normal, small or square
source facebook4j.Media The media content from either a java.io.File or java.io.Inputstream
subject String The note of the subject
tagUpdate facebook4j.TagUpdate Photo tag information
testUser1 facebook4j.TestUser Test user
testUser2 facebook4j.TestUser Test user
testUserId String The ID of the test user
title String The title text
toUserId String The ID of the user to tag
toUserIds java.util.List<tring> The IDs of the users to tag
userId String The Facebook user ID
userId1 String The ID of a user
userId2 String The ID of a user
userIds String[] The IDs of users to invite to event
userLocale String The test user locale
videoId String The video ID

Reading Options

The reading option of type facebook4j.Reading adds support for reading parameters, which allow selecting specific fields, limits the number of results, etc. For more information see Graph API at Facebook Developers.
It is also used by consumer endpoints to poll Facebook data to avoid sending duplicate messages across polls.
The reading option can be a reference or value of type facebook4j.Reading, or can be specified using the following reading options in either the endpoint URI or exchange header with CamelFacebook. prefix.
Expand
Option Description
reading.fields Field names to retrieve, in the format field1,field2,...
reading.limit Limit for number of items to return for list results, e.g. a limit of 10 returns items 1 through 10
reading.offset Starting offset for list results, e.g. a limit of 10, and offset of 10 returns items 11 through 20
reading.until A Unix timestamp or strtotime data value that points to the end of the range of time-based data
reading.since A Unix timestamp or strtotime data value that points to the start of the range of time-based data
reading.locale Retrieve localized content in a particular locale, specified as a String with the format language[,country][,variant]
reading.with Retrieve information about objects that have location information attached, set it to true
reading.metadata Use Facebook Graph API Introspection to retrieve object metadata, set it to true
reading.filter User's stream filter key. See Facebook stream_filter

Message header

Any of the URI options can be provided in a message header for producer endpoints with CamelFacebook. prefix.

Message body

All result message bodies utilize objects provided by the Facebook4J API. Producer endpoints can specify the option name for incoming message body in the inBody endpoint parameter.
For endpoints that return an array, or facebook4j.ResponseList, or java.util.List, a consumer endpoint will map every elements in the list to distinct messages.

Use cases

To create a post within your Facebook profile, send this producer a facebook4j.PostUpdate body.
	from("direct:foo")
		.to("facebook://postFeed/inBody=postUpdate);
Copy to Clipboard Toggle word wrap
To poll all statuses on your home feed every 5 seconds:
	from("facebook://home?consumer.delay=5000")
		.to("bean:blah");
Copy to Clipboard Toggle word wrap
Searching using a producer with dynamic options from header.
In the bar header we have the Facebook search string we want to execute in public posts, so we need to assign this value to the CamelFacebook.query header.
	from("direct:foo")
		.setHeader("CamelFacebook.query", header("bar"))
		.to("facebook://posts");
Copy to Clipboard Toggle word wrap

Chapter 43. File2

File Component - Apache Camel 2.0 onwards

The File component provides access to file systems, allowing files to be processed by any other Apache Camel Components or messages from other components to be saved to disk.

URI format

file:directoryName[?options]
Copy to Clipboard Toggle word wrap
or
file://directoryName[?options]
Copy to Clipboard Toggle word wrap
Where directoryName represents the underlying file directory.
You can append query options to the URI in the following format, ?option=value&option=value&...
Note
Apache Camel only supports endpoints configured with a starting directory. So the directoryName must be a directory. If you want to consume a single file only, you can use the fileName option, e.g. by setting fileName=thefilename. Also, the starting directory must not contain dynamic expressions with ${ } placeholders. Again use the fileName option to specify the dynamic part of the filename.
Avoid reading files currently being written by another application
Beware the JDK File IO API is a bit limited in detecting whether another application is currently writing/copying a file. And the implementation can be different depending on OS platform as well. This could lead to that Apache Camel thinks the file is not locked by another process and start consuming it. Therefore you have to do you own investigation as to what suits your environment. To help with this, Apache Camel provides different readLock options and the doneFileOption option that you can use. See also the section the section called “Consuming files from folders where others drop files directly”.

URI Options

Expand
Name Default Value Description
autoCreate true Automatically create missing directories in the file's pathname. For the file consumer, that means creating the starting directory. For the file producer, it means the directory where the files should be written.
bufferSize 128kb Write buffer sized in bytes.
fileName null Use Expression such as File Language to dynamically set the filename. For consumers, it's used as a filename filter. For producers, it's used to evaluate the filename to write. If an expression is set, it take precedence over the CamelFileName header. (Note: The header itself can also be an Expression). The expression options support both String and Expression types. If the expression is a String type, it is always evaluated using the File Language. If the expression is an Expression type, the specified Expression type is used - this allows you, for instance, to use OGNL expressions. For the consumer, you can use it to filter filenames, so you can for instance consume today's file using the File Language syntax: mydata-${date:now:yyyyMMdd}.txt. From Camel 2.11 onwards the producers support the CamelOverruleFileName header which takes precedence over any existing CamelFileName header; the CamelOverruleFileName is a header that is used only once, and makes it easier as this avoids to temporary store CamelFileName and have to restore it afterwards.
flatten false Flatten is used to flatten the file name path to strip any leading paths, so it's just the file name. This allows you to consume recursively into sub-directories, but when you eg write the files to another directory they will be written in a single directory. Setting this to true on the producer enforces that any file name recived in CamelFileName header will be stripped for any leading paths.
charset null Camel 2.5: this option is used to specify the encoding of the file, and camel will set the Exchange property with Exchange.CHARSET_NAME with the value of this option.
copyAndDeleteOnRenameFail true Camel 2.9: whether to fallback and do a copy and delete file, in case the file could not be renamed directly. This option is not available for the FTP component.
renameUsingCopy false
Camel 2.13.1: Perform rename operations using a copy and delete strategy. This is primarily used in environments where the regular rename operation is unreliable (e.g. across different file systems or networks). This option takes precedence over the copyAndDeleteOnRenameFail parameter that will automatically fall back to the copy and delete strategy, but only after additional delays.

Consumer only

Expand
Name Default Value Description
initialDelay 1000 Milliseconds before polling the file/directory starts.
delay 500 Milliseconds before the next poll of the file/directory.
useFixedDelay true Set to true to use fixed delay between pools, otherwise fixed rate is used. See ScheduledExecutorService in JDK for details.
runLoggingLevel TRACE Camel 2.8: The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that.
recursive false If a directory, will look for files in all the sub-directories as well.
delete false If true, the file will be deleted after it is processed successfully.
noop false If true, the file is not moved or deleted in any way. This option is good for readonly data, or for ETL type requirements. If noop=true, Apache Camel will set idempotent=true as well, to avoid consuming the same files over and over again.
preMove null Use Expression such as File Language to dynamically set the filename when moving it before processing. For example to move in-progress files into the order directory set this value to order.
move .camel Use Expression such as File Language to dynamically set the filename when moving it after processing. To move files into a .done subdirectory just enter .done.
moveFailed null Use Expression such as File Language to dynamically set the filename when moving failed files after processing. To move files into a error subdirectory just enter error. Note: When moving the files to another location it can/will handle the error when you move it to another location so Apache Camel cannot pick up the file again.
include null Is used to include files, if filename matches the regex pattern.
exclude null Is used to exclude files, if filename matches the regex pattern.
antInclude null Camel 2.10: Ant style filter inclusion, for example antInclude=\*{}*/*{}.txt. Multiple inclusions may be specified in comma-delimited format. See below for more details about ant path filters.
antExclude null Camel 2.10: Ant style filter exclusion. If both antInclude and antExclude are used, antExclude takes precedence over antInclude. Multiple exclusions may be specified in comma-delimited format. See below for more details about ant path filters.
antFilterCaseSensitive true Camel 2.11: Ant style filter which is case sensitive or not.
idempotent false Option to use the Idempotent Consumer EIP pattern to let Apache Camel skip already processed files. Will by default use a memory based LRUCache that holds 1000 entries. If noop=true then idempotent will be enabled as well to avoid consuming the same files over and over again.
idempotentKey Expression Camel 2.11: To use a custom idempotent key. By default the absolute path of the file is used. You can use the File Language, for example to use the file name and file size, you can do: idempotentKey=$-$ .
idempotentRepository null Pluggable repository as a org.apache.camel.processor.idempotent.MessageIdRepository class. Will by default use MemoryMessageIdRepository if none is specified and idempotent is true.
inProgressRepository memory Pluggable in-progress repository as a org.apache.camel.processor.idempotent.MessageIdRepository class. The in-progress repository is used to account the current in progress files being consumed. By default a memory based repository is used.
filter null Pluggable filter as a org.apache.camel.component.file.GenericFileFilter class. Will skip files if filter returns false in its accept() method. Apache Camel also ships with an ANT path matcher filter in the camel-spring component. More details in section below.
sorter null Pluggable sorter as a java.util.Comparator<org.apache.camel.component.file.GenericFile> class.
sortBy null Built-in sort using the File Language. Supports nested sorts, so you can have a sort by file name and as a 2nd group sort by modified date. See sorting section below for details.
readLock markerFile
Used by consumer, to only poll the files if it has exclusive read-lock on the file (i.e. the file is not in-progress or being written). Apache Camel will wait until the file lock is granted.
The readLock option supports the following built-in strategies:
  • changed uses a length/modification timestamp to detect whether the file is currently being copied or not. Will wait at least 1 second to determine this, so this option cannot consume files as fast as the others, but can be more reliable as the JDK IO API cannot always determine whether a file is currently being used by another process.
  • fileLock is for using java.nio.channels.FileLock. This approach should be avoided when accessing a remote file system via a mount/share unless that file system supports distributed file locks.
  • rename attempts to rename the file, in order to test whether we can get an exclusive read-lock.
  • none is for no read locks at all.
readLockTimeout 0 (for FTP, 2000) Optional timeout in milliseconds for the read-lock, if supported by the read-lock. If the read-lock could not be granted and the timeout triggered, then Apache Camel will skip the file. At next poll Apache Camel, will try the file again, and this time maybe the read-lock could be granted. Currently fileLock, changed and rename support the timeout.
readLockCheckInterval 1000 (for FTP, 5000) Camel 2.6: Interval in millis for the read-lock, if supported by the read lock. This interval is used for sleeping between attempts to acquire the read lock. For example when using the changed read lock, you can set a higher interval period to cater for slow writes. The default of 1 sec. may be too fast if the producer is very slow writing the file.
readLockMinLength 1 Camel 2.10.1: This option applied only for readLock=changed. This option allows you to configure a minimum file length. By default Camel expects the file to contain data, and thus the default value is 1. You can set this option to zero, to allow consuming zero-length files.
readLockLoggingLevel WARN Camel 2.12: Logging level used when a read lock could not be acquired. By default a WARN is logged. You can change this level, for example to OFF to not have any logging. This option is only applicable for readLock of types: changed, fileLock, rename.
readLockMarkerFile true
Camel 2.14: Whether to use marker file with the changed, rename, or exclusive read lock types. By default a marker file is used as well to guard against other processes picking up the same files. This behavior can be turned off by setting this option to false. For example if you do not want to write marker files to the file systems by the Camel application.
directoryMustExist
Camel 2.5: Similar to startingDirectoryMustExist but this applies during polling recursive sub directories.
doneFileName null Camel 2.6: If provided, Camel will only consume files if a done file exists. This option configures what file name to use. Either you can specify a fixed name. Or you can use dynamic placeholders. The done file is always expected in the same folder as the original file. See using done file and writing done file sections for examples.
exclusiveReadLockStrategy null Pluggable read-lock as a org.apache.camel.component.file.GenericFileExclusiveReadLockStrategy implementation.
maxMessagesPerPoll 0 An integer that defines the maximum number of messages to gather per poll. By default, no maximum is set. Can be used to set a limit of e.g. 1000 to avoid having the server read thousands of files as it starts up. Set a value of 0 or negative to disabled it.
eagerMaxMessagesPerPoll true
Camel 2.9.3: Allows for controlling whether the limit from maxMessagesPerPoll is eager or not. If eager then the limit is during the scanning of files. Where as false would scan all files, and then perform sorting. Setting this option to false allows for sorting all files first, and then limit the poll. Mind that this requires a higher memory usage as all file details are in memory to perform the sorting.
minDepth 0 Camel 2.8: The minimum depth to start processing when recursively processing a directory. Using minDepth=1 means the base directory. Using minDepth=2 means the first sub directory. This option is not supported by FTP consumer.
maxDepth Integer.MAX_VALUE Camel 2.8: The maximum depth to traverse when recursively processing a directory. This option is not supported by FTP consumer.
processStrategy null A pluggable org.apache.camel.component.file.GenericFileProcessStrategy allowing you to implement your own readLock option or similar. Can also be used when special conditions must be met before a file can be consumed, such as a special ready file exists. If this option is set then the readLock option does not apply.
startingDirectoryMustExist false Whether the starting directory must exist. Mind that the autoCreate option is default enabled, which means the starting directory is normally auto-created if it doesn't exist. You can disable autoCreate and enable this to ensure the starting directory must exist. Will throw an exception, if the directory doesn't exist.
pollStrategy null
A pluggable org.apache.camel.spi.PollingConsumerPollStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel. In other words, the error occurred while the polling was gathering information, for instance access to a file network failed so Camel cannot access it to scan for files. The default implementation will log the caused exception at WARN level and ignore it.
sendEmptyMessageWhenIdle false
Camel 2.9: If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead.
consumer.bridgeErrorHandler false
Camel 2.10: Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while trying to pick up files, or the like, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that by default will be logged at WARN/ERROR level and ignored. See further below on this page fore more details, at section How to use the Camel error handler to deal with exceptions triggered outside the routing engine.
scheduledExecutorService null
Camel 2.10: Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool. This option allows you to share a thread pool among multiple file consumers.
scheduler null Camel 2.12: To use a custom scheduler to trigger the consumer to run. See more details at Polling Consumer, for example there is a Quartz2, and Spring based scheduler that supports CRON expressions.
backoffMultiplier 0 Camel 2.12: To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the next actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured. See more details at Polling Consumer.
backoffIdleThreshold 0 Camel 2.12: The number of subsequent idle polls that should happen before the backoffMultipler should kick-in.
backoffErrorThreshold 0 Camel 2.12: The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in.

Default behavior for file consumer

  • By default the file is locked for the duration of the processing.
  • After the route has completed, files are moved into the .camel subdirectory, so that they appear to be deleted.
  • The File Consumer will always skip any file whose name starts with a dot, such as ., .camel, .m2 or .groovy.
  • Only files (not directories) are matched for valid filename, if options such as: includeNamePrefix, includeNamePostfix, excludeNamePrefix, excludeNamePostfix, regexPattern are used.

Producer only

Expand
Name Default Value Description
fileExist Override What to do if a file already exists with the same name. The following values can be specified: Override, Append, Fail, Ignore, Move, and TryRename (Camel 2.11.1). Override, which is the default, replaces the existing file. Append adds content to the existing file. Fail throws a GenericFileOperationException, indicating that there is already an existing file. Ignore silently ignores the problem and does not override the existing file, but assumes everything is okay. The Move option requires Camel 2.10.1 onwards, and the corresponding moveExisting option to be configured as well. The option eagerDeleteTargetFile can be used to control what to do if an moving the file, and there exists already an existing file, otherwise causing the move operation to fail. The Move option will move any existing files, before writing the target file. TryRenameCamel 2.11.1 is only applicable if tempFileName option is in use. This allows to try renaming the file from the temporary name to the actual name, without doing any exists check. This check may be faster on some file systems and especially FTP servers.
tempPrefix null This option is used to write the file using a temporary name and then, after the write is complete, rename it to the real name. Can be used to identify files being written and also avoid consumers (not using exclusive read locks) reading in progress files. Is often used by FTP when uploading big files.
tempFileName null Camel 2.1: The same as tempPrefix option but offering a more fine grained control on the naming of the temporary filename as it uses the File Language.
keepLastModified false Camel 2.2: Will keep the last modified timestamp from the source file (if any). Will use the Exchange.FILE_LAST_MODIFIED header to located the timestamp. This header can contain either a java.util.Date or long with the timestamp. If the timestamp exists and the option is enabled it will set this timestamp on the written file. Note: This option only applies to the file producer. You cannot use this option with any of the ftp producers.
eagerDeleteTargetFile true Camel 2.3: Whether or not to eagerly delete any existing target file. This option only applies when you use fileExists=Override and the tempFileName option as well. You can use this to disable (set it to false) deleting the target file before the temp file is written. For example you may write big files and want the target file to exists during the temp file is being written. This ensure the target file is only deleted until the very last moment, just before the temp file is being renamed to the target filename. From Camel 2.10.1 on this option is also used to control whether to delete any existing files when fileExist=Move is enabled, and an existing file exists. If the option copyAndDeleteOnRenameFail is false, an exception will be thrown if an existing file existed; if it's true, the existing file is deleted before the move operation.
doneFileName null Camel 2.6: If provided, then Camel will write a 2nd done file when the original file has been written. The done file will be empty. This option configures what file name to use. Either you can specify a fixed name. Or you can use dynamic placeholders. The done file will always be written in the same folder as the original file. See writing done file section for examples.
allowNullBody false Camel 2.10.1: Used to specify if a null body is allowed during file writing. If set to true then an empty file will be created, when set to false, and attempting to send a null body to the file component, a GenericFileWriteException of 'Cannot write null body to file.' will be thrown. If the `fileExist` option is set to 'Override', then the file will be truncated, and if set to `append` the file will remain unchanged.
forceWrites true Camel 2.10.5/2.11: Whether to force syncing writes to the file system. You can turn this off if you do not want this level of guarantee, for example if writing to logs / audit logs etc; this would yield better performance.

Default behavior for file producer

  • By default it will override any existing file, if one exist with the same name. In Apache Camel 1.x the Append is the default for the file producer. We have changed this to Override in Apache Camel 2.0 as this is also the default file operation using java.io.File. And also the default for the FTP library we use in the camel-ftp component.

Move and Delete operations

Any move or delete operations is executed after (post command) the routing has completed; so during processing of the Exchange the file is still located in the inbox folder.
Lets illustrate this with an example:
    from("file://inbox?move=.done").to("bean:handleOrder");
Copy to Clipboard Toggle word wrap
When a file is dropped in the inbox folder, the file consumer notices this and creates a new FileExchange that is routed to the handleOrder bean. The bean then processes the File object. At this point in time the file is still located in the inbox folder. After the bean completes, and thus the route is completed, the file consumer will perform the move operation and move the file to the .done sub-folder.
The move and preMove options is considered as a directory name (though if you use an expression such as File Language, or Simple then the result of the expression evaluation is the file name to be used - eg if you set
move=../backup/copy-of-${file:name}
Copy to Clipboard Toggle word wrap
then that's using the File Language which we use return the file name to be used), which can be either relative or absolute. If relative, the directory is created as a sub-folder from within the folder where the file was consumed.
By default, Apache Camel will move consumed files to the .camel sub-folder relative to the directory where the file was consumed.
If you want to delete the file after processing, the route should be:
    from("file://inobox?delete=true").to("bean:handleOrder");
Copy to Clipboard Toggle word wrap
We have introduced a pre move operation to move files before they are processed. This allows you to mark which files have been scanned as they are moved to this sub folder before being processed.
    from("file://inbox?preMove=inprogress").to("bean:handleOrder");
Copy to Clipboard Toggle word wrap
You can combine the pre move and the regular move:
    from("file://inbox?preMove=inprogress&move=.done").to("bean:handleOrder");
Copy to Clipboard Toggle word wrap
So in this situation, the file is in the inprogress folder when being processed and after it's processed, it's moved to the .done folder.

Fine grained control over Move and PreMove option

The move and preMove option is Expression-based, so we have the full power of the File Language to do advanced configuration of the directory and name pattern. Apache Camel will, in fact, internally convert the directory name you enter into a File Language expression. So when we enter move=.done Apache Camel will convert this into: ${file:parent}/.done/${file:onlyname}. This is only done if Apache Camel detects that you have not provided a ${ } in the option value yourself. So when you enter an expression containing ${ }, the expression is interpreted as a File Language expression.
So if we want to move the file into a backup folder with today's date as the pattern, we can do:
move=backup/${date:now:yyyyMMdd}/${file:name}
Copy to Clipboard Toggle word wrap

About moveFailed

The moveFailed option allows you to move files that could not be processed succesfully to another location such as a error folder of your choice. For example to move the files in an error folder with a timestamp you can use moveFailed=/error/${file:name.noext}-${date:now:yyyyMMddHHmmssSSS}.${file:name.ext}.
See more examples at File Language.

Message Headers

The following headers are supported by this component:

File producer only

Expand
Header Description
CamelFileName Specifies the name of the file to write (relative to the endpoint directory). The name can be a String; a String with a File Language or Simple expression; or an Expression object. If it's null then Apache Camel will auto-generate a filename based on the message unique ID.
CamelFileNameProduced The actual absolute filepath (path + name) for the output file that was written. This header is set by Camel and its purpose is providing end-users with the name of the file that was written.
CamelOverruleFileName Camel 2.11: Is used for overruling CamelFileName header and use the value instead (but only once, as the producer will remove this header after writing the file). The value can be only be a String. Notice that if the option fileName has been configured, then this is still being evaluated.

File consumer only

Expand
Header Description
CamelFileName Name of the consumed file as a relative file path with offset from the starting directory configured on the endpoint.
CamelFileNameOnly Only the file name (the name with no leading paths).
CamelFileAbsolute A boolean option specifying whether the consumed file denotes an absolute path or not. Should normally be false for relative paths. Absolute paths should normally not be used but we added to the move option to allow moving files to absolute paths. But can be used elsewhere as well.
CamelFileAbsolutePath The absolute path to the file. For relative files this path holds the relative path instead.
CamelFilePath The file path. For relative files this is the starting directory + the relative filename. For absolute files this is the absolute path.
CamelFileRelativePath The relative path.
CamelFileParent The parent path.
CamelFileLength A long value containing the file size.
CamelFileLastModified A long value containing the last modified timestamp of the file.

Batch Consumer

This component implements the Batch Consumer.

Exchange Properties, file consumer only

As the file consumer is BatchConsumer it supports batching the files it polls. By batching it means that Apache Camel will add some properties to the Exchange so you know the number of files polled the current index in that order.
Expand
Property Description
CamelBatchSize The total number of files that was polled in this batch.
CamelBatchIndex The current index of the batch. Starts from 0.
CamelBatchComplete A boolean value indicating the last Exchange in the batch. Is only true for the last entry.
This allows you for instance to know how many files exists in this batch and for instance let the Aggregator aggregate this number of files.

Common gotchas with folder and filenames

When Apache Camel is producing files (writing files) there are a few gotchas affecting how to set a filename of your choice. By default, Apache Camel will use the message ID as the filename, and since the message ID is normally a unique generated ID, you will end up with filenames such as: ID-MACHINENAME-2443-1211718892437-1-0. If such a filename is not desired, then you must provide a filename in the CamelFileName message header. The constant, Exchange.FILE_NAME, can also be used.
The sample code below produces files using the message ID as the filename:
from("direct:report").to("file:target/reports");
Copy to Clipboard Toggle word wrap
To use report.txt as the filename you have to do:
from("direct:report").setHeader(Exchange.FILE_NAME, constant("report.txt")).to( "file:target/reports");
Copy to Clipboard Toggle word wrap
Or the same as above, but with CamelFileName:
from("direct:report").setHeader("CamelFileName", constant("report.txt")).to( "file:target/reports");
Copy to Clipboard Toggle word wrap
And a syntax where we set the filename on the endpoint with the fileName URI option.
from("direct:report").to("file:target/reports/?fileName=report.txt");
Copy to Clipboard Toggle word wrap

Filename Expression

Filename can be set either using the expression option or as a string-based File Language expression in the CamelFileName header. See the File Language for syntax and samples.
Beware if you consume files from a folder where other applications write files directly. Take a look at the different readLock options to see what suits your use cases. The best approach is however to write to another folder and after the write move the file in the drop folder. However if you write files directly to the drop folder then the option changed could better detect whether a file is currently being written/copied as it uses a file changed algorithm to see whether the file size / modification changes over a period of time. The other read lock options rely on Java File API that sadly is not always very good at detecting this. You may also want to look at the doneFileName option, which uses a marker file (done) to signal when a file is done and ready to be consumed.

Using done files

Available as of Camel 2.6
See also section writing done files below.
If you want only to consume files when a done file exists, then you can use the doneFileName option on the endpoint.
      from("file:bar?doneFileName=done");

Copy to Clipboard Toggle word wrap
Will only consume files from the bar folder, if a file name done exists in the same directory as the target files. Camel will automatically delete the done file when it's done consuming the files.
However its more common to have one done file per target file. This means there is a 1:1 correlation. To do this you must use dynamic placeholders in the doneFileName option. Currently Camel supports the following two dynamic tokens: file:name and file:name.noext which must be enclosed in ${ }. The consumer only supports the static part of the done file name as either prefix or suffix (not both).
      from("file:bar?doneFileName=${file:name}.done");

Copy to Clipboard Toggle word wrap
In this example only files will be polled if there exists a done file with the name file name.done. For example
  • hello.txt - is the file to be consumed
  • hello.txt.done - is the associated done file
You can also use a prefix for the done file, such as:
      from("file:bar?doneFileName=ready-${file:name}");

Copy to Clipboard Toggle word wrap
  • hello.txt - is the file to be consumed
  • ready-hello.txt - is the associated done file

Writing done files

Available as of Camel 2.6
After you have written af file you may want to write an additional done file as a kinda of marker, to indicate to others that the file is finished and has been written. To do that you can use the doneFileName option on the file producer endpoint.
.to("file:bar?doneFileName=done");
Copy to Clipboard Toggle word wrap
Will simply create a file named done in the same directory as the target file.
However its more common to have one done file per target file. This means there is a 1:1 correlation. To do this you must use dynamic placeholders in the doneFileName option. Currently Camel supports the following two dynamic tokens: file:name and file:name.noext which must be enclosed in ${ }.
.to("file:bar?doneFileName=done-${file:name}");
Copy to Clipboard Toggle word wrap
Will for example create a file named done-foo.txt if the target file was foo.txt in the same directory as the target file.
.to("file:bar?doneFileName=${file:name}.done");
Copy to Clipboard Toggle word wrap
Will for example create a file named foo.txt.done if the target file was foo.txt in the same directory as the target file.
.to("file:bar?doneFileName=${file:name.noext}.done");
Copy to Clipboard Toggle word wrap
Will for example create a file named foo.done if the target file was foo.txt in the same directory as the target file.
from("file://inputdir/?delete=true").to("file://outputdir")
Copy to Clipboard Toggle word wrap
from("file://inputdir/?delete=true").to("file://outputdir?overruleFile=copy-of-${file:name}")
Copy to Clipboard Toggle word wrap
Listen on a directory and create a message for each file dropped there. Copy the contents to the outputdir and delete the file in the inputdir.
from("file://inputdir/?recursive=true&delete=true").to("file://outputdir")
Copy to Clipboard Toggle word wrap
Listen on a directory and create a message for each file dropped there. Copy the contents to the outputdir and delete the file in the inputdir. Will scan recursively into sub-directories. Will lay out the files in the same directory structure in the outputdir as the inputdir, including any sub-directories.
inputdir/foo.txt
inputdir/sub/bar.txt
Copy to Clipboard Toggle word wrap
Will result in the following output layout:
outputdir/foo.txt
outputdir/sub/bar.txt
Copy to Clipboard Toggle word wrap

Using flatten

If you want to store the files in the outputdir directory in the same directory, disregarding the source directory layout (e.g. to flatten out the path), you just add the flatten=true option on the file producer side:
from("file://inputdir/?recursive=true&delete=true").to("file://outputdir?flatten=true")
Copy to Clipboard Toggle word wrap
Will result in the following output layout:
outputdir/foo.txt
outputdir/bar.txt
Copy to Clipboard Toggle word wrap
Apache Camel will by default move any processed file into a .camel subdirectory in the directory the file was consumed from.
from("file://inputdir/?recursive=true&delete=true").to("file://outputdir")
Copy to Clipboard Toggle word wrap
Affects the layout as follows: before
inputdir/foo.txt
inputdir/sub/bar.txt
Copy to Clipboard Toggle word wrap
after
inputdir/.camel/foo.txt
inputdir/sub/.camel/bar.txt
outputdir/foo.txt
outputdir/sub/bar.txt
Copy to Clipboard Toggle word wrap
from("file://inputdir/").process(new Processor() {
  public void process(Exchange exchange) throws Exception {
    Object body = exchange.getIn().getBody();
    // do some business logic with the input body
  }
});
Copy to Clipboard Toggle word wrap
The body will be a File object that points to the file that was just dropped into the inputdir directory.
from("file://inputdir/").convertBodyTo(String.class).to("jms:test.queue")
Copy to Clipboard Toggle word wrap
By default the file endpoint sends a FileMessage which contains a File object as the body. If you send this directly to the JMS component the JMS message will only contain the File object but not the content. By converting the File to a String, the message will contain the file contents, which is probably what you want.
The route above using Spring DSL:
   <route>
      <from uri="file://inputdir/"/>
      <convertBodyTo type="java.lang.String"/>
      <to uri="jms:test.queue"/>
   </route>
Copy to Clipboard Toggle word wrap

Writing to files

Apache Camel is of course also able to write files, i.e. produce files. In the sample below we receive some reports on the SEDA queue that we process before they are written to a directory.
public void testToFile() throws Exception {
    MockEndpoint mock = getMockEndpoint("mock:result");
    mock.expectedMessageCount(1);
    mock.expectedFileExists("target/test-reports/report.txt");

    template.sendBody("direct:reports", "This is a great report");

    assertMockEndpointsSatisfied();
}

protected JndiRegistry createRegistry() throws Exception {
    // bind our processor in the registry with the given id
    JndiRegistry reg = super.createRegistry();
    reg.bind("processReport", new ProcessReport());
    return reg;
}

protected RouteBuilder createRouteBuilder() throws Exception {
    return new RouteBuilder() {
        public void configure() throws Exception {
            // the reports from the seda queue is processed by our processor
            // before they are written to files in the target/reports directory
            from("direct:reports").processRef("processReport").to("file://target/test-reports", "mock:result");
        }
    };
}

private static class ProcessReport implements Processor {

    public void process(Exchange exchange) throws Exception {
        String body = exchange.getIn().getBody(String.class);
        // do some business logic here

        // set the output to the file
        exchange.getOut().setBody(body);

        // set the output filename using java code logic, notice that this is done by setting
        // a special header property of the out exchange
        exchange.getOut().setHeader(Exchange.FILE_NAME, "report.txt");
    }

}
Copy to Clipboard Toggle word wrap

Write to subdirectory using Exchange.FILE_NAME

Using a single route, it is possible to write a file to any number of subdirectories. If you have a route setup as such:
  <route>
    <from uri="bean:myBean"/>
    <to uri="file:/rootDirectory"/>
  </route>
Copy to Clipboard Toggle word wrap
You can have myBean set the header Exchange.FILE_NAME to values such as:
Exchange.FILE_NAME = hello.txt => /rootDirectory/hello.txt
Exchange.FILE_NAME = foo/bye.txt => /rootDirectory/foo/bye.txt
Copy to Clipboard Toggle word wrap
This allows you to have a single route to write files to multiple destinations.
Sometime you need to temporarily write the files to some directory relative to the destination directory. Such situation usually happens when some external process with limited filtering capabilities is reading from the directory you are writing to. In the example below files will be written to the /var/myapp/filesInProgress directory and after data transfer is done, they will be atomically moved to the /var/myapp/finalDirectory directory.
from("direct:start").
  to("file:///var/myapp/finalDirectory?tempPrefix=/../filesInProgress/");
Copy to Clipboard Toggle word wrap

Using expression for filenames

In this sample we want to move consumed files to a backup folder using today's date as a sub-folder name:
from("file://inbox?move=backup/${date:now:yyyyMMdd}/${file:name}").to("...");
Copy to Clipboard Toggle word wrap
See File Language for more samples.
Apache Camel supports Idempotent Consumer directly within the component so it will skip already processed files. This feature can be enabled by setting the idempotent=true option.
from("file://inbox?idempotent=true").to("...");
Copy to Clipboard Toggle word wrap
Camel uses the absolute file name as the idempotent key, to detect duplicate files. From Camel 2.11 onwards you can customize this key by using an expression in the idempotentKey option. For example to use both the name and the file size as the key
  <route>
    <from uri="file://inbox?idempotent=true&dempotentKey=${file:name}-${file:size}"/>
    <to uri="bean:processInbox"/>
  </route>
Copy to Clipboard Toggle word wrap
By default Apache Camel uses an in-memory based store for keeping track of consumed files, it uses a least recently used cache holding up to 1000 entries. You can plugin your own implementation of this store by using the idempotentRepository option using the # sign in the value to indicate it's a referring to a bean in the Registry with the specified id.
   <!-- define our store as a plain spring bean -->
   <bean id="myStore" class="com.mycompany.MyIdempotentStore"/>

  <route>
    <from uri="file://inbox?idempotent=true&dempotentRepository=#myStore"/>
    <to uri="bean:processInbox"/>
  </route>
Copy to Clipboard Toggle word wrap
Apache Camel will log at DEBUG level if it skips a file because it has been consumed before:
DEBUG FileConsumer is idempotent and the file has been consumed before. Will skip this file: target\idempotent\report.txt
Copy to Clipboard Toggle word wrap

Using a file based idempotent repository

In this section we will use the file based idempotent repository org.apache.camel.processor.idempotent.FileIdempotentRepository instead of the in-memory based that is used as default. This repository uses a 1st level cache to avoid reading the file repository. It will only use the file repository to store the content of the 1st level cache. Thereby the repository can survive server restarts. It will load the content of the file into the 1st level cache upon startup. The file structure is very simple as it stores the key in separate lines in the file. By default, the file store has a size limit of 1mb and when the file grows larger, Apache Camel will truncate the file store and rebuild the content by flushing the 1st level cache into a fresh empty file.
We configure our repository using Spring XML creating our file idempotent repository and define our file consumer to use our repository with the idempotentRepository using \# sign to indicate Registry lookup:
<!-- this is our file based idempotent store configured to use the .filestore.dat as file -->
<bean id="fileStore" class="org.apache.camel.processor.idempotent.FileIdempotentRepository">
    <!-- the filename for the store -->
    <property name="fileStore" value="target/fileidempotent/.filestore.dat"/>
    <!-- the max filesize in bytes for the file. Apache Camel will trunk and flush the cache
         if the file gets bigger -->
    <property name="maxFileStoreSize" value="512000"/>
    <!-- the number of elements in our store -->
    <property name="cacheSize" value="250"/>
</bean>

<camelContext xmlns="http://camel.apache.org/schema/spring">
    <route>
        <from uri="file://target/fileidempotent/?idempotent=true&dempotentRepository=#fileStore&ove=done/${file:name}"/>
        <to uri="mock:result"/>
    </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Using a JPA based idempotent repository

In this section we will use the JPA based idempotent repository instead of the in-memory based that is used as default.
First we need a persistence-unit in META-INF/persistence.xml where we need to use the class org.apache.camel.processor.idempotent.jpa.MessageProcessed as model.
<persistence-unit name="idempotentDb" transaction-type="RESOURCE_LOCAL">
  <class>org.apache.camel.processor.idempotent.jpa.MessageProcessed</class>

  <properties>
    <property name="openjpa.ConnectionURL" value="jdbc:derby:target/idempotentTest;create=true"/>
    <property name="openjpa.ConnectionDriverName" value="org.apache.derby.jdbc.EmbeddedDriver"/>
    <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema"/>
    <property name="openjpa.Log" value="DefaultLevel=WARN, Tool=INFO"/>
  </properties>
</persistence-unit>
Copy to Clipboard Toggle word wrap
Then we need to setup a Spring jpaTemplate in the spring XML file:
<!-- this is standard spring JPA configuration -->
<bean id="jpaTemplate" class="org.springframework.orm.jpa.JpaTemplate">
    <property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
    <!-- we use idempotentDB as the persitence unit name defined in the persistence.xml file -->
    <property name="persistenceUnitName" value="idempotentDb"/>
</bean>
Copy to Clipboard Toggle word wrap
And finally we can create our JPA idempotent repository in the spring XML file as well:
<!-- we define our jpa based idempotent repository we want to use in the file consumer -->
<bean id="jpaStore" class="org.apache.camel.processor.idempotent.jpa.JpaMessageIdRepository">
    <!-- Here we refer to the spring jpaTemplate -->
    <constructor-arg index="0" ref="jpaTemplate"/>
    <!-- This 2nd parameter is the name  (= a cateogry name).
         You can have different repositories with different names -->
    <constructor-arg index="1" value="FileConsumer"/>
</bean>
Copy to Clipboard Toggle word wrap
And then we just need to reference the jpaStore bean in the file consumer endpoint, using the idempotentRepository option and the # syntax:
  <route>
    <from uri="file://inbox?idempotent=true&dempotentRepository=#jpaStore"/>
    <to uri="bean:processInbox"/>
  </route>
Copy to Clipboard Toggle word wrap
Apache Camel supports pluggable filtering strategies. You can then configure the endpoint with such a filter to skip certain files being processed.
In the sample we have built our own filter that skips files starting with skip in the filename:
public class MyFileFilter implements GenericFileFilter {
    public boolean accept(GenericFile pathname) {
        // we dont accept any files starting with skip in the name
        return !pathname.getFileName().startsWith("skip");
    }
}
Copy to Clipboard Toggle word wrap
And then we can configure our route using the filter attribute to reference our filter (using # notation) that we have defined in the spring XML file:
   <!-- define our filter as a plain spring bean -->
   <bean id="myFilter" class="com.mycompany.MyFileFilter"/>

  <route>
    <from uri="file://inbox?filter=#myFilter"/>
    <to uri="bean:processInbox"/>
  </route>
Copy to Clipboard Toggle word wrap

Filtering using ANT path matcher

The ANT path matcher is shipped out-of-the-box in the camel-spring jar. So you need to depend on camel-spring if you are using Maven. The reasons is that we leverage Spring's AntPathMatcher to do the actual matching.
The file paths is matched with the following rules:
  • ? matches one character
  • * matches zero or more characters
  • ** matches zero or more directories in a path
The sample below demonstrates how to use it:
<camelContext xmlns="http://camel.apache.org/schema/spring">
    <template id="camelTemplate"/>

    <!-- use myFilter as filter to allow setting ANT paths for which files to scan for -->
    <endpoint id="myFileEndpoint" uri="file://target/antpathmatcher?recursive=true&ilter=#myAntFilter"/>

    <route>
        <from ref="myFileEndpoint"/>
        <to uri="mock:result"/>
    </route>
</camelContext>

<!-- we use the antpath file filter to use ant paths for includes and exlucde -->
<bean id="myAntFilter" class="org.apache.camel.component.file.AntPathMatcherGenericFileFilter">
    <!-- include and file in the subfolder that has day in the name -->
    <property name="includes" value="**/subfolder/**/*day*"/>
    <!-- exclude all files with bad in name or .xml files. Use comma to seperate multiple excludes -->
    <property name="excludes" value="**/*bad*,**/*.xml"/>
</bean>
Copy to Clipboard Toggle word wrap

Sorting using Comparator

Apache Camel supports pluggable sorting strategies. This strategy it to use the build in java.util.Comparator in Java. You can then configure the endpoint with such a comparator and have Apache Camel sort the files before being processed.
In the sample we have built our own comparator that just sorts by file name:
public class MyFileSorter implements Comparator<GenericFile> {
    public int compare(GenericFile o1, GenericFile o2) {
        return o1.getFileName().compareToIgnoreCase(o2.getFileName());
    }
}
Copy to Clipboard Toggle word wrap
And then we can configure our route using the sorter option to reference to our sorter (mySorter) we have defined in the spring XML file:
   <!-- define our sorter as a plain spring bean -->
   <bean id="mySorter" class="com.mycompany.MyFileSorter"/>

  <route>
    <from uri="file://inbox?sorter=#mySorter"/>
    <to uri="bean:processInbox"/>
  </route>
Copy to Clipboard Toggle word wrap
URI options can reference beans using the # syntax
In the Spring DSL route about notice that we can reference beans in the Registry by prefixing the id with #. So writing sorter=#mySorter, will instruct Apache Camel to go look in the Registry for a bean with the ID, mySorter.

Sorting using sortBy

Apache Camel supports pluggable sorting strategies. This strategy it to use the File Language to configure the sorting. The sortBy option is configured as follows:
sortBy=group 1;group 2;group 3;...
Copy to Clipboard Toggle word wrap
Where each group is separated with semi colon. In the simple situations you just use one group, so a simple example could be:
sortBy=file:name
Copy to Clipboard Toggle word wrap
This will sort by file name, you can reverse the order by prefixing reverse: to the group, so the sorting is now Z..A:
sortBy=reverse:file:name
Copy to Clipboard Toggle word wrap
As we have the full power of File Language we can use some of the other parameters, so if we want to sort by file size we do:
sortBy=file:length
Copy to Clipboard Toggle word wrap
You can configure to ignore the case, using ignoreCase: for string comparison, so if you want to use file name sorting but to ignore the case then we do:
sortBy=ignoreCase:file:name
Copy to Clipboard Toggle word wrap
You can combine ignore case and reverse, however reverse must be specified first:
sortBy=reverse:ignoreCase:file:name
Copy to Clipboard Toggle word wrap
In the sample below we want to sort by last modified file, so we do:
sortBy=file:modified
Copy to Clipboard Toggle word wrap
And then we want to group by name as a 2nd option so files with same modifcation is sorted by name:
sortBy=file:modified;file:name
Copy to Clipboard Toggle word wrap
Now there is an issue here, can you spot it? Well the modified timestamp of the file is too fine as it will be in milliseconds, but what if we want to sort by date only and then subgroup by name? Well as we have the true power of File Language we can use the its date command that supports patterns. So this can be solved as:
sortBy=date:file:yyyyMMdd;file:name
Copy to Clipboard Toggle word wrap
Yeah, that is pretty powerful, oh by the way you can also use reverse per group, so we could reverse the file names:
sortBy=date:file:yyyyMMdd;reverse:file:name
Copy to Clipboard Toggle word wrap

Using GenericFileProcessStrategy

The option processStrategy can be used to use a custom GenericFileProcessStrategy that allows you to implement your own begin, commit and rollback logic. For instance lets assume a system writes a file in a folder you should consume. But you should not start consuming the file before another ready file have been written as well.
So by implementing our own GenericFileProcessStrategy we can implement this as:
  • In the begin() method we can test whether the special ready file exists. The begin method returns a boolean to indicate if we can consume the file or not.
  • in the commit() method we can move the actual file and also delete the ready file.
Important when using consumer.bridgeErrorHandler
When using consumer.bridgeErrorHandler, then interceptors, OnCompletion does not apply. The Exchange is processed directly by the Camel Error Handler, and does not allow prior actions such as interceptors, onCompletion to take action.

Debug logging

This component has log level TRACE that can be helpful if you have problems.
See also:

Chapter 44. Flatpack

Flatpack Component

The Flatpack component supports fixed width and delimited file parsing using the FlatPack library. Notice: This component only supports consuming from flatpack files to Object model. You can not (yet) write from Object model to flatpack format.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-flatpack</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

Copy to Clipboard Toggle word wrap

URI format

flatpack:[delim|fixed]:flatPackConfig.pzmap.xml[?options]
Copy to Clipboard Toggle word wrap
Or for a delimited file handler with no configuration file just use:
flatpack:someName[?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?option=value&option=value&...

URI Options

Expand
Name Default Value Description
delimiter , The default character delimiter for delimited files.
textQualifier " The text qualifier for delimited files.
ignoreFirstRecord true Whether the first line is ignored for delimited files (for the column headers).
splitRows true As of Apache Camel 1.5, the component can either process each row one by one or the entire content at once.
allowShortLines false *Camel 2.9.3:* Allows for lines to be shorter than expected and ignores the extra characters.
ignoreExtraColumns false *Camel 2.9.3:* Allows for lines to be longer than expected and ignores the extra characters.

Examples

  • flatpack:fixed:foo.pzmap.xml creates a fixed-width endpoint using the foo.pzmap.xml file configuration.
  • flatpack:delim:bar.pzmap.xml creates a delimited endpoint using the bar.pzmap.xml file configuration.
  • flatpack:foo creates a delimited endpoint called foo with no file configuration.

Message Headers

Apache Camel will store the following headers on the IN message:
Expand
Header Description
camelFlatpackCounter The current row index. For splitRows=false the counter is the total number of rows.

Message Body

The component delivers the data in the IN message as a org.apache.camel.component.flatpack.DataSetList object that has converters for java.util.Map or java.util.List. Usually you want the Map if you process one row at a time (splitRows=true). Use List for the entire content (splitRows=false), where each element in the list is a Map. Each Map contains the key for the column name and its corresponding value.
For example to get the firstname from the sample below:
  Map row = exchange.getIn().getBody(Map.class);
  String firstName = row.get("FIRSTNAME");
Copy to Clipboard Toggle word wrap
However, you can also always get it as a List (even for splitRows=true). The same example:
  List data = exchange.getIn().getBody(List.class);
  Map row = (Map)data.get(0);
  String firstName = row.get("FIRSTNAME");
Copy to Clipboard Toggle word wrap

Header and Trailer records

The header and trailer notions in Flatpack are supported. However, you must use fixed record IDs:
  • header for the header record (must be lowercase)
  • trailer for the trailer record (must be lowercase)
The example below illustrates this fact that we have a header and a trailer. You can omit one or both of them if not needed.
    <RECORD id="header" startPosition="1" endPosition="3" indicator="HBT">
        <COLUMN name="INDICATOR" length="3"/>
        <COLUMN name="DATE" length="8"/>
    </RECORD>

    <COLUMN name="FIRSTNAME" length="35" />
    <COLUMN name="LASTNAME" length="35" />
    <COLUMN name="ADDRESS" length="100" />
    <COLUMN name="CITY" length="100" />
    <COLUMN name="STATE" length="2" />
    <COLUMN name="ZIP" length="5" />

    <RECORD id="trailer" startPosition="1" endPosition="3" indicator="FBT">
        <COLUMN name="INDICATOR" length="3"/>
        <COLUMN name="STATUS" length="7"/>
    </RECORD>
Copy to Clipboard Toggle word wrap

Using the endpoint

A common use case is sending a file to this endpoint for further processing in a separate route. For example:
  <camelContext xmlns="http://activemq.apache.org/camel/schema/spring">
    <route>
      <from uri="file://someDirectory"/>
      <to uri="flatpack:foo"/>
    </route>

    <route>
      <from uri="flatpack:foo"/>
      ...
    </route>
  </camelContext>
Copy to Clipboard Toggle word wrap
You can also convert the payload of each message created to a Map for easy Bean Integration

Chapter 45. FOP

FOP Component

Available as of Camel 2.10
The FOP component allows you to render a message into different output formats using Apache FOP.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-fop</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

fop://outputFormat?[options]
Copy to Clipboard Toggle word wrap

Output Formats

The primary output format is PDF but other output formats are also supported:
Expand
Name Output Format Description
PDF application/pdf Portable Document Format
PS application/postscript Adobe Postscript
PCL application/x-pcl Printer Control Language
PNG image/png PNG images
JPEG image/jpeg JPEG images
SVG image/svg+xml Scalable Vector Graphics
XML application/X-fop-areatree Area tree representation
MIF application/mif FrameMaker's MIF
RTF application/rtf Rich Text Format
TXT text/plain Text
The complete list of valid output formats can be found here

Endpoint Options

Expand
name default value description
outputFormat See table above.
userConfigURL none The location of a configuration file with the following structure. From Camel 2.12 onwards the file is loaded from the classpath by default. You can use file:, or classpath: as prefix to load the resource from file or classpath. In previous releases the file is always loaded from file system.
fopFactory Allows you to use a custom configured or custom implementation of org.apache.fop.apps.FopFactory.

Message Operations

Expand
name default value description
CamelFop.Output.Format Overrides the output format for that message
CamelFop.Encrypt.userPassword PDF user password
CamelFop.Encrypt.ownerPassword PDF owner passoword
CamelFop.Encrypt.allowPrint true Allows printing the PDF
CamelFop.Encrypt.allowCopyContent true Allows copying content of the PDF
CamelFop.Encrypt.allowEditContent true Allows editing content of the PDF
CamelFop.Encrypt.allowEditAnnotations true Allows editing annotation of the PDF
CamelFop.Render.producer Apache FOP Metadata element for the system/software that produces the document
CamelFop.Render.creator Metadata element for the user that created the document
CamelFop.Render.creationDate Creation Date
CamelFop.Render.author Author of the content of the document
CamelFop.Render.title Title of the document
CamelFop.Render.subject Subject of the document
CamelFop.Render.keywords Set of keywords applicable to this document

Example

Below is an example route that renders PDFs from XML data and XSLT template and saves the PDF files in target folder:
from("file:source/data/xml")
    .to("xslt:xslt/template.xsl")
    .to("fop:application/pdf")
    .to("file:target/data");
Copy to Clipboard Toggle word wrap

Chapter 46. FreeMarker

FreeMarker

The freemarker: component allows you to process a message using a FreeMarker template. This can be ideal when using Templating to generate responses for requests.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-freemarker</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

freemarker:templateName[?options]
Copy to Clipboard Toggle word wrap
Where templateName is the classpath-local URI of the template to invoke; or the complete URL of the remote template (for example, file://folder/myfile.ftl).
You can append query options to the URI in the following format, ?option=value&option=value&...

Options

Expand
Option Default Description
contentCache true Cache for the resource content when it's loaded. Note: as of Camel 2.9 cached resource content can be cleared via JMX using the endpoint's clearContentCache operation.
encoding null Character encoding of the resource content.
templateUpdateDelay 5 *Camel 2.9:* Number of seconds the loaded template resource will remain in the cache.

FreeMarker Context

Apache Camel will provide exchange information in the FreeMarker context (just a Map). The Exchange is transferred as:
Expand
Key Value
exchange The Exchange itself.
exchange.properties The Exchange properties.
headers The headers of the In message.
camelContext The Camel Context.
request The In message.
body The In message body.
response The Out message (only for InOut message exchange pattern).
From Camel 2.14, you can set up your custom FreeMarker context in the message header with the key, CamelFreemarkerDataModel, like this:
Map<String, Object> variableMap = new HashMap<String, Object>();
variableMap.put("headers", headersMap);
variableMap.put("body", "Monday");
variableMap.put("exchange", exchange);
exchange.getIn().setHeader("CamelFreemarkerDataModel", variableMap);
Copy to Clipboard Toggle word wrap

Hot reloading

The FreeMarker template resource is by default not hot reloadable for both file and classpath resources (expanded jar). If you set contentCache=false, then Apache Camel will not cache the resource and hot reloading is thus enabled. This scenario can be used in development.

Dynamic templates

Available as of Camel 2.1 Camel provides two headers by which you can define a different resource location for a template or the template content itself. If any of these headers is set then Camel uses this over the endpoint configured resource. This allows you to provide a dynamic template at runtime.
Expand
Header Type Description Support Version
FreemarkerConstants.FREEMARKER_RESOURCE org.springframework.core.io.Resource The template resource <= 1.6.2, <= 2.1
FreemarkerConstants.FREEMARKER_RESOURCE_URI String A URI for the template resource to use instead of the endpoint configured. >= 2.1
FreemarkerConstants.FREEMARKER_TEMPLATE String The template to use instead of the endpoint configured. >= 2.1

Samples

For example, you can define a route like the following:
from("activemq:My.Queue").
  to("freemarker:com/acme/MyResponse.ftl");
Copy to Clipboard Toggle word wrap
To use a FreeMarker template to formulate a response to InOut message exchanges (where there is a JMSReplyTo header).
If you want to process InOnly exchanges, you could use a FreeMarker template to transform the message before sending it on to another endpoint:
from("activemq:My.Queue").
  to(ExchangePattern.InOut,"freemarker:com/acme/MyResponse.ftl").
  to("activemq:Another.Queue");
Copy to Clipboard Toggle word wrap
And to disable the content cache (for example, for development usage where the .ftl template should be hot reloaded):
from("activemq:My.Queue").
  to(ExchangePattern.InOut,"freemarker:com/acme/MyResponse.ftl?contentCache=false").
  to("activemq:Another.Queue");
Copy to Clipboard Toggle word wrap
And for a file-based resource:
from("activemq:My.Queue").
  to(ExchangePattern.InOut,"freemarker:file://myfolder/MyResponse.ftl?contentCache=false").
  to("activemq:Another.Queue");
Copy to Clipboard Toggle word wrap
In Camel 2.1 it's possible to specify what template the component should use dynamically via a header, so for example:
from("direct:in").
  setHeader(FreemarkerConstants.FREEMARKER_RESOURCE_URI).constant("path/to/my/template.ftl").
  to("freemarker:dummy");
Copy to Clipboard Toggle word wrap

The Email Sample

In this sample we want to use FreeMarker templating for an order confirmation email. The email template is laid out in FreeMarker as:
Dear ${headers.lastName}, ${headers.firstName}

Thanks for the order of ${headers.item}.

Regards Camel Riders Bookstore
${body}
Copy to Clipboard Toggle word wrap
And the java code:
private Exchange createLetter() {
    Exchange exchange = context.getEndpoint("direct:a").createExchange();
    Message msg = exchange.getIn();
    msg.setHeader("firstName", "Claus");
    msg.setHeader("lastName", "Ibsen");
    msg.setHeader("item", "Camel in Action");
    msg.setBody("PS: Next beer is on me, James");
    return exchange;
}

@Test
public void testFreemarkerLetter() throws Exception {
    MockEndpoint mock = getMockEndpoint("mock:result");
    mock.expectedMessageCount(1);
    mock.expectedBodiesReceived("Dear Ibsen, Claus\n\nThanks for the order of Camel in Action."
      + "\n\nRegards Camel Riders Bookstore\nPS: Next beer is on me, James");

    template.send("direct:a", createLetter());

    mock.assertIsSatisfied();
}

protected RouteBuilder createRouteBuilder() throws Exception {
    return new RouteBuilder() {
        public void configure() throws Exception {
            from("direct:a")
                .to("freemarker:org/apache/camel/component/freemarker/letter.ftl")
                .to("mock:result");
        }
    };
}
Copy to Clipboard Toggle word wrap

Chapter 47. FTP2

FTP/SFTP Component

This component provides access to remote file systems over the FTP and SFTP protocols.
Consuming from remote FTP server
Make sure you read the section titled Default when consuming files further below for details related to consuming files.

URI format

ftp://[username@]hostname[:port]/directoryname[?options]
sftp://[username@]hostname[:port]/directoryname[?options]
ftps://[username@]hostname[:port]/directoryname[?options]
Copy to Clipboard Toggle word wrap
Where directoryname represents the underlying directory. Can contain nested folders.
If no username is provided, then anonymous login is attempted using no password. If no port number is provided, Apache Camel will provide default values according to the protocol (ftp = 21, sftp = 22, ftps = 21).
This component uses two different libraries for the actual FTP work. FTP and FTPS use Apache Commons Net while SFTP uses JCraft JSCH.
You can append query options to the URI in the following format, ?option=value&option=value&...

URI Options

The options below are exclusive to the FTP component:
Expand
Name Default Value Description
username null Specifies the username to use to log in to the remote file systen.
password null Specifies the password to use to log in to the remote file system.
binary false Specifies the file transfer mode, BINARY or ASCII. Default is ASCII (false).
disconnect false Camel 2.2: Whether or not to disconnect from remote FTP server right after use. Can be used for both consumer and producer. Disconnect will only disconnect the current connection to the FTP server. If you have a consumer which you want to stop, then you need to stop the consumer/route instead.
localWorkDirectory null When consuming, a local work directory can be used to store the remote file content directly in local files, to avoid loading the content into memory. This is beneficial, if you consume a very big remote file and thus can conserve memory. See below for more details.
passiveMode false FTP only: Specifies whether to use passive mode connections. Default is active mode {false).
securityProtocol TLS
FTPS only: Sets the underlying security protocol. The following values are defined: TLS: Transport Layer Security SSL: Secure Sockets Layer
disableSecureDataChannelDefaults false Camel 2.4: FTPS only: Whether or not to disable using default values for execPbsz and execProt when using secure data transfer. You can set this option to true if you want to be in absolute full control what the options execPbsz and execProt should be used.
download true Camel 2.11: Whether the FTP consumer should download the file. If this option is set to false, then the message body will be null, but the consumer will still trigger a Camel Exchange that has details about the file such as file name, file size, etc. It's just that the file will not be downloaded.
streamDownload false Camel 2.11: hether the consumer should download the entire file up front, the default behavior, or if it should pass an InputStream ead from the remote resource rather than an in-memory array as the in body of the amel Exchange.  his option is ignored if download s false r is localWorkDirectory is provided.  his option is useful for working with large remote files.
execProt null
Camel 2.4: FTPS only: Will by default use option P if secure data channel defaults hasn't been disabled. Possible values are: C: Clear S: Safe (SSL protocol only) E: Confidential (SSL protocol only) P: Private
execPbsz null Camel 2.4: FTPS only: This option specifies the buffer size of the secure data channel. If option useSecureDataChannel has been enabled and this option has not been explicit set, then value 0 is used.
isImplicit false FTPS only: Sets the security mode(implicit/explicit). Default is explicit (false).
knownHostsFile null SFTP only: Sets the known_hosts file, so that the SFTP endpoint can do host key verification.
knownHostsUri null SFTP only:Camel 2.11.1: Sets the known_hosts file (loaded from classpath by default), so that the SFTP endpoint can do host key verification.
keyPair null SFTP only:Camel 2.12.0: Sets the Java KeyPair for SSH public key authentication, it supports DSA or RSA keys.
privateKeyFile null SFTP only: Set the private key file to that the SFTP endpoint can do private key verification.
privateKeyUri null SFTP only:Camel 2.11.1: Set the private key file (loaded from classpath by default) to that the SFTP endpoint can do private key verification.
privateKey null SFTP only:Camel 2.11.1: Set the private key as byte[] to that the SFTP endpoint can do private key verification.
privateKeyFilePassphrase null SFTP only: Set the private key file passphrase to that the SFTP endpoint can do private key verification.
privateKeyPassphrase null SFTP only:Camel 2.11.1: Set the private key file passphrase to that the SFTP endpoint can do private key verification.
preferredAuthentications null SFTP only:Camel 2.10.7, 2.11.2,2.12.0: set the preferred authentications which SFTP endpoint will used. Some example include:password,publickey. If not specified the default list from JSCH will be used.
ciphers null Camel 2.8.2, 2.9: SFTP only Set a comma separated list of ciphers that will be used in order of preference. Possible cipher names are defined by JCraft JSCH. Some examples include: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc,aes192-cbc,aes256-cbc. If not specified the default list from JSCH will be used.
fastExistsCheck false Camel 2.8.2, 2.9: If set this option to be true, camel-ftp will use the list file directly to check if the file exists. Since some FTP server may not support to list the file directly, if the option is false, camel-ftp will use the old way to list the directory and check if the file exists. Note from Camel 2.10.1 onwards this option also influences readLock=changed to control whether it performs a fast check to update file information or not. This can be used to speed up the process if the FTP server has a lot of files.
strictHostKeyChecking no SFTP only:Camel 2.2: Sets whether to use strict host key checking. Possible values are: no, yes and ask. ask does not make sense to use as Camel cannot answer the question for you as its meant for human intervention. Note: The default in Camel 2.1 and below was ask.
maximumReconnectAttempts 3 Specifies the maximum reconnect attempts Apache Camel performs when it tries to connect to the remote FTP server. Use 0 to disable this behavior.
reconnectDelay 1000 Delay in millis Apache Camel will wait before performing a reconnect attempt.
connectTimeout 10000 Camel 2.4: Is the connect timeout in millis. This corresponds to using ftpClient.connectTimeout for the FTP/FTPS. For SFTP this option is also used when attempting to connect.
soTimeout null FTP and FTPS Only:Camel 2.4: Is the SocketOptions.SO_TIMEOUT value in millis. Note SFTP will automatic use the connectTimeout as the soTimeout.
timeout 30000 FTP and FTPS Only:Camel 2.4: Is the data timeout in millis. This corresponds to using ftpClient.dataTimeout for the FTP/FTPS. For SFTP there is no data timeout.
throwExceptionOnConnectFailed false Camel 2.5: Whether or not to thrown an exception if a successful connection and login could not be establish. This allows a custom pollStrategy to deal with the exception, for example to stop the consumer or the likes.
siteCommand null FTP and FTPS Only:Camel 2.5: To execute site commands after successful login. Multiple site commands can be separated using a new line character (\n). Use help site to see which site commands your FTP server supports.
stepwise true When consuming directories, specifies whether or not to use stepwise mode for traversing the directory tree. Stepwise means that it will CD one directory at a time. For more details, see the section called “Stepwise changing directories”.
separator Auto Camel 2.6: Dictates what path separator char to use when uploading files. Auto means use the path provided without altering it. UNIX means use UNIX style path separators. Windows means use Windows style path separators.
chmod null *SFTP Producer Only:* Camel 2.9: Allows you to set chmod on the stored file. For example chmod=640.
compression 0 *SFTP Only:* Camel 2.8.3/2.9: To use compression. Specify a level from 1 to 10. Important: You must manually add the needed JSCH zlib JAR to the classpath for compression support.
ftpClient null FTP and FTPS Only:Camel 2.1: Allows you to use a custom org.apache.commons.net.ftp.FTPClient instance.
ftpClientConfig null FTP and FTPS Only:Camel 2.1: Allows you to use a custom org.apache.commons.net.ftp.FTPClientConfig instance.
serverAliveInterval 0 SFTP Only:Camel 2.8 Allows you to set the serverAliveInterval of the sftp session
serverAliveCountMax 1 SFTP Only:Camel 2.8 Allows you to set the serverAliveCountMax of the sftp session
ftpClient.trustStore.file null FTPS Only: Sets the trust store file, so that the FTPS client can look up for trusted certificates.
ftpClient.trustStore.type JKS FTPS Only: Sets the trust store type.
ftpClient.trustStore.algorithm SunX509 FTPS Only: Sets the trust store algorithm.
ftpClient.trustStore.password null FTPS Only: Sets the trust store password.
ftpClient.keyStore.file null FTPS Only: Sets the key store file, so that the FTPS client can look up for the private certificate.
ftpClient.keyStore.type JKS FTPS Only: Sets the key store type.
ftpClient.keyStore.algorithm SunX509 FTPS Only: Sets the key store algorithm.
ftpClient.keyStore.password null FTPS Only: Sets the key store password.
ftpClient.keyStore.keyPassword null FTPS Only: Sets the private key password.
sslContextParameters null FTPS Only:Camel 2.9: Reference to a org.apache.camel.util.jsse.SSLContextParameters in the Registry. This reference overrides any configured SSL related options on ftpClient as well as the securityProtocol (SSL, TLS, etc.) set on FtpsConfiguration. See Using the JSSE Configuration Utility.
proxy null SFTP Only:Camel 2.10.7, 2.11.1: Reference to a com.jcraft.jsch.Proxy in the Registry. This proxy is used to consume/send messages from the target SFTP host.
useList true FTP/FTPS Only:Camel 2.12.1: Whether the consumer should use FTP LIST command to retrieve directory listing to see which files exists. If this option is set to false, then stepwise=false must be configured, and also fileName must be configured to a fixed name, so the consumer knows the name of the file to retrieve. When doing this only that single file can be retrieved. See further below for more details.
ignoreFileNotFoundOrPermissionError false Camel 2.12.1: Whether the consumer should ignore when a file was attempted to be retrieved but did not exist (for some reason), or failure due insufficient file permission error.
FTPS component default trust store
When using the ftpClient. properties related to SSL with the FTPS component, the trust store accept all certificates. If you only want trust selective certificates, you have to configure the trust store with the ftpClient.trustStore.xxx options or by configuring a custom ftpClient.
When using sslContextParameters, the trust store is managed by the configuration of the provided SSLContextParameters instance.
More options
See File for more options, as all the options from File are inherited by FTP2.
You can configure additional options on the ftpClient and ftpClientConfig from the URI directly by using the ftpClient. or ftpClientConfig. prefix.
For example to set the setDataTimeout on the FTPClient to 30 seconds you can do:
from("ftp://foo@myserver?password=secret&ftpClient.dataTimeout=30000")
    .to("bean:foo");
Copy to Clipboard Toggle word wrap
You can mix and match and have use both prefixes, for example to configure date format or timezones.
from("ftp://foo@myserver?password=secret&ftpClient.dataTimeout=30000&ftpClientConfig.serverLanguageCode=fr")
    .to("bean:foo");
Copy to Clipboard Toggle word wrap
You can have as many of these options as you like.
See the documentation of the Apache Commons FTP FTPClientConfig for possible options and more details. And as well for Apache Commons FTP FTPClient.
If you do not like having many and long configuration in the url you can refer to the ftpClient or ftpClientConfig to use by letting Camel lookup in the Registry for it.
For example:
   <bean id="myConfig" class="org.apache.commons.net.ftp.FTPClientConfig">
       <property name="lenientFutureDates" value="true"/>
       <property name="serverLanguageCode" value="fr"/>
   </bean>

Copy to Clipboard Toggle word wrap
And then let Camel lookup this bean when you use the # notation in the url.
from("ftp://foo@myserver?password=secret&ftpClientConfig=#myConfig").to("bean:foo");

Copy to Clipboard Toggle word wrap

More URI options

Important
See File2 as all the options there also applies for this component.

Examples

Here are some examples of FTP endpoint URIs:
ftp://someone@someftpserver.com/public/upload/images/holiday2008?password=secret&binary=true
ftp://someoneelse@someotherftpserver.co.uk:12049/reports/2008/password=secret&binary=false
ftp://publicftpserver.com/download
Copy to Clipboard Toggle word wrap
FTP Consumer does not support concurrency
The FTP consumer (with the same endpoint) does not support concurrency (the backing FTP client is not thread safe). You can use multiple FTP consumers to poll from different endpoints. It is only a single endpoint that does not support concurrent consumers.
The FTP producer does not have this issue, it supports concurrency.
More information
This component is an extension of the File2 component. So there are more samples and details on the File2 component page.

Default when consuming files

The FTP consumer will by default leave the consumed files untouched on the remote FTP server. You have to configure it explicit if you want it to delete the files or move them to another location. For example you can use delete=true to delete the files, or use move=.done to move the files into a hidden done sub directory.
The regular File consumer is different as it will by default move files to a .camel sub directory. The reason Camel does not do this by default for the FTP consumer is that it may lack permissions by default to be able to move or delete files.

limitations

The option readLock can be used to force Apache Camel not to consume files that are currently in the process of being written. However, this option is turned off by default, as it requires that the user has write access. There are other solutions to avoid consuming files that are currently being written over FTP; for instance, you can write to a temporary destination and move the file after it has been written.
The ftp producer does not support appending to existing files. Any existing files on the remote server will be deleted before the file is written.

Message Headers

The following message headers can be used to affect the behavior of the component
Expand
Header Description
CamelFileName Specifies the output file name (relative to the endpoint directory) to be used for the output message when sending to the endpoint. If this is not present and no expression either, then a generated message ID is used as the filename instead.
CamelFileNameProduced The actual absolute filepath (path + name) for the output file that was written. This header is set by Apache Camel and its purpose is providing end-users the name of the file that was written.
CamelFileBatchIndex Current index out of total number of files being consumed in this batch.
CamelFileBatchSize Total number of files being consumed in this batch.
CamelFileHost The remote hostname.
CamelFileLocalWorkPath Path to the local work file, if local work directory is used.
In addition the FTP/FTPS consumer and producer will enrich the Camel Message with the following headers:
Expand
Header Description
CamelFtpReplyCode Camel 2.11.1: The FTP client reply code (the type is a integer)
CamelFtpReplyString Camel 2.11.1: The FTP client reply string

About timeouts

The two sets of libraries (see above) have different APIs for setting the timeout. You can use the connectTimeout option for both of them to set a timeout in milliseconds to establish a network connection. An individual soTimeout can also be set on the FTP/FTPS, which corresponds to using ftpClient.soTimeout. Notice SFTP will automatically use connectTimeout as its soTimeout. The timeout option only applies for FTP/FTSP as the data timeout, which corresponds to the ftpClient.dataTimeout value. All timeout values are in milliseconds.

Using Local Work Directory

Apache Camel supports consuming from remote FTP servers and downloading the files directly into a local work directory. This avoids reading the entire remote file content into memory as it is streamed directly into the local file using FileOutputStream.
Apache Camel will store to a local file with the same name as the remote file, though with .inprogress as extension while the file is being downloaded. Afterwards, the file is renamed to remove the .inprogress suffix. And finally, when the Exchange is complete the local file is deleted.
So if you want to download files from a remote FTP server and store it as files then you need to route to a file endpoint such as:
from("ftp://someone@someserver.com?password=secret&localWorkDirectory=/tmp").to("file://inbox");
Copy to Clipboard Toggle word wrap
Optimization by renaming work file
The route above is ultra efficient as it avoids reading the entire file content into memory. It will download the remote file directly to a local file stream. The java.io.File handle is then used as the Exchange body. The file producer leverages this fact and can work directly on the work file java.io.File handle and perform a java.io.File.rename to the target filename. As Apache Camel knows it's a local work file, it can optimize and use a rename instead of a file copy, as the work file is meant to be deleted anyway.

Stepwise changing directories

Camel FTP can operate in two modes in terms of traversing directories when consuming files (for example, downloading) or producing files (for example, uploading):
  • stepwise
  • not stepwise
You may want to pick either one depending on your situation and security issues. Some Camel end users can only download files if they use stepwise, while others can only download if they do not. At least you have the choice to pick.
Note that stepwise changing of directory will in most cases only work when the user is confined to it's home directory and when the home directory is reported as /.
The difference between the two of them is best illustrated with an example. Suppose we have the following directory structure on the remote FTP server we need to traverse and download files:
      /
      /one
      /one/two
      /one/two/sub-a
      /one/two/sub-b
Copy to Clipboard Toggle word wrap
And that we have a file in each of sub-a (a.txt) and sub-b (b.txt) folder.

Using stepwise=true (default mode)

The following log shows the conversation between the FTP endpoint and the remote FTP server when the FTP endpoint is operating in stepwise mode:
      TYPE A
      200 Type set to A
      PWD
      257 "/" is current directory.
      CWD one
      250 CWD successful. "/one" is current directory.
      CWD two
      250 CWD successful. "/one/two" is current directory.
      SYST
      215 UNIX emulated by FileZilla
      PORT 127,0,0,1,17,94
      200 Port command successful
      LIST
      150 Opening data channel for directory list.
      226 Transfer OK
      CWD sub-a
      250 CWD successful. "/one/two/sub-a" is current directory.
      PORT 127,0,0,1,17,95
      200 Port command successful
      LIST
      150 Opening data channel for directory list.
      226 Transfer OK
      CDUP
      200 CDUP successful. "/one/two" is current directory.
      CWD sub-b
      250 CWD successful. "/one/two/sub-b" is current directory.
      PORT 127,0,0,1,17,96
      200 Port command successful
      LIST
      150 Opening data channel for directory list.
      226 Transfer OK
      CDUP
      200 CDUP successful. "/one/two" is current directory.
      CWD /
      250 CWD successful. "/" is current directory.
      PWD
      257 "/" is current directory.
      CWD one
      250 CWD successful. "/one" is current directory.
      CWD two
      250 CWD successful. "/one/two" is current directory.
      PORT 127,0,0,1,17,97
      200 Port command successful
      RETR foo.txt
      150 Opening data channel for file transfer.
      226 Transfer OK
      CWD /
      250 CWD successful. "/" is current directory.
      PWD
      257 "/" is current directory.
      CWD one
      250 CWD successful. "/one" is current directory.
      CWD two
      250 CWD successful. "/one/two" is current directory.
      CWD sub-a
      250 CWD successful. "/one/two/sub-a" is current directory.
      PORT 127,0,0,1,17,98
      200 Port command successful
      RETR a.txt
      150 Opening data channel for file transfer.
      226 Transfer OK
      CWD /
      250 CWD successful. "/" is current directory.
      PWD
      257 "/" is current directory.
      CWD one
      250 CWD successful. "/one" is current directory.
      CWD two
      250 CWD successful. "/one/two" is current directory.
      CWD sub-b
      250 CWD successful. "/one/two/sub-b" is current directory.
      PORT 127,0,0,1,17,99
      200 Port command successful
      RETR b.txt
      150 Opening data channel for file transfer.
      226 Transfer OK
      CWD /
      250 CWD successful. "/" is current directory.
      QUIT
      221 Goodbye
      disconnected.                                                 

Copy to Clipboard Toggle word wrap
As you can see when stepwise is enabled, it will traverse the directory structure using CD xxx.

Using stepwise=false

The following log shows the conversation between the FTP endpoint and the remote FTP server when the FTP endpoint is operating in non-stepwise mode:
      230 Logged on
      TYPE A
      200 Type set to A
      SYST
      215 UNIX emulated by FileZilla
      PORT 127,0,0,1,4,122
      200 Port command successful
      LIST one/two
      150 Opening data channel for directory list
      226 Transfer OK
      PORT 127,0,0,1,4,123
      200 Port command successful
      LIST one/two/sub-a
      150 Opening data channel for directory list
      226 Transfer OK
      PORT 127,0,0,1,4,124
      200 Port command successful
      LIST one/two/sub-b
      150 Opening data channel for directory list
      226 Transfer OK
      PORT 127,0,0,1,4,125
      200 Port command successful
      RETR one/two/foo.txt
      150 Opening data channel for file transfer.
      226 Transfer OK
      PORT 127,0,0,1,4,126
      200 Port command successful
      RETR one/two/sub-a/a.txt
      150 Opening data channel for file transfer.
      226 Transfer OK
      PORT 127,0,0,1,4,127
      200 Port command successful
      RETR one/two/sub-b/b.txt
      150 Opening data channel for file transfer.
      226 Transfer OK
      QUIT
      221 Goodbye
      disconnected.                              

Copy to Clipboard Toggle word wrap
As you can see when not using stepwise, there are no CD operation invoked at all.

Samples

In the sample below we set up Apache Camel to download all the reports from the FTP server once every hour (60 min) as BINARY content and store it as files on the local file system.
protected RouteBuilder createRouteBuilder() throws Exception {
    return new RouteBuilder() {
        public void configure() throws Exception {
            // we use a delay of 60 minutes (eg. once pr. hour we poll the FTP server
            long delay = 60 * 60 * 1000L;

            // from the given FTP server we poll (= download) all the files
            // from the public/reports folder as BINARY types and store this as files
            // in a local directory. Apache Camel will use the filenames from the FTPServer

            // notice that the FTPConsumer properties must be prefixed with "consumer." in the URL
            // the delay parameter is from the FileConsumer component so we should use consumer.delay as
            // the URI parameter name. The FTP Component is an extension of the File Component.
            from("ftp://tiger:scott@localhost/public/reports?binary=true&consumer.delay=" + delay).
                to("file://target/test-reports");
        }
    };
}
Copy to Clipboard Toggle word wrap
And the route using Spring DSL:
  <route>
     <from uri="ftp://scott@localhost/public/reports?password=tiger&inary=true&elay=60000"/>
     <to uri="file://target/test-reports"/>
  </route>
Copy to Clipboard Toggle word wrap

Consuming a remote FTP server triggered by a route

The FTP consumer is built as a scheduled consumer to be used in the from route. However, if you want to start consuming from an FTP server triggered within a route, use a route like the following:
from("seda:start")
   // define the file name so that only a single file is polled and deleted once retrieved
   .pollEnrich("ftp://admin@localhost:21/getme?password=admin&binary=false&fileName=myFile.txt&delete=true")
   .to("mock:result");
Copy to Clipboard Toggle word wrap
from("ftps://admin@localhost:2222/public/camel?password=admin&securityProtocol=SSL&isImplicit=true
      &ftpClient.keyStore.file=./src/test/resources/server.jks
      &ftpClient.keyStore.password=password&ftpClient.keyStore.keyPassword=password")
  .to("bean:foo");

Copy to Clipboard Toggle word wrap
from("ftps://admin@localhost:2222/public/camel?password=admin&ftpClient.trustStore.file=./src/test/resources/server.jks&ftpClient.trustStore.password=password")
  .to("bean:foo");
Copy to Clipboard Toggle word wrap
Apache Camel supports pluggable filtering strategies. You define a filter strategy by implementing the org.apache.camel.component.file.GenericFileFilter interface in Java. You can then configure the endpoint with the filter to skip certain files.
In the following sample we define a filter that only accepts files whose filename starts with report.
public class MyFileFilter<T> implements GenericFileFilter<T> {

    public boolean accept(GenericFile<T> file) {
        // we only want report files 
        return file.getFileName().startsWith("report");
    }
}
Copy to Clipboard Toggle word wrap
And then we can configure our route using the filter attribute to reference our filter (using # notation) that we have defined in the spring XML file:
   <!-- define our sorter as a plain spring bean -->
   <bean id="myFilter" class="com.mycompany.MyFileFilter"/>

  <route>
    <from uri="ftp://someuser@someftpserver.com?password=secret&filter=#myFilter"/>
    <to uri="bean:processInbox"/>
  </route>
Copy to Clipboard Toggle word wrap

Filtering using ANT path matcher

The ANT path matcher is a filter that is shipped out-of-the-box in the camel-spring jar. So you need to depend on camel-spring if you are using Maven. The reason is that we leverage Spring's AntPathMatcher to do the actual matching.
The file paths are matched with the following rules:
  • ? matches one character
  • * matches zero or more characters
  • ** matches zero or more directories in a path
The sample below demonstrates how to use it:
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"/>
<camelContext xmlns="http://camel.apache.org/schema/spring">

    <template id="camelTemplate"/>

    <!-- use myFilter as filter to allow setting ANT paths for which files to scan for -->
    <endpoint id="myFTPEndpoint" uri="ftp://admin@localhost:${SpringFileAntPathMatcherRemoteFileFilterTest.ftpPort}/antpath?password=admin&ecursive=true&elay=10000&nitialDelay=2000&ilter=#myAntFilter"/>

    <route>
        <from ref="myFTPEndpoint"/>
        <to uri="mock:result"/>
    </route>
</camelContext>

<!-- we use the AntPathMatcherRemoteFileFilter to use ant paths for includes and exclude -->
<bean id="myAntFilter" class="org.apache.camel.component.file.AntPathMatcherGenericFileFilter">
    <!-- include any files in the sub-folder that have day in the name -->
    <property name="includes" value="**/subfolder/**/*day*"/>
    <!-- exclude all files with bad in name or .xml files. Use comma to seperate multiple excludes -->
    <property name="excludes" value="**/*bad*,**/*.xml"/>
</bean>
Copy to Clipboard Toggle word wrap

Using a proxy with SFTP

To use an HTTP proxy to connect to your remote host, you can configure your route in the following way:
<!-- define our sorter as a plain spring bean -->
<bean id="proxy" class="com.jcraft.jsch.ProxyHTTP">
  <constructor-arg value="localhost"/>
  <constructor-arg value="7777"/>
</bean>

<route>
  <from uri="sftp://localhost:9999/root?username=admin&password=admin&proxy=#proxy"/>
  <to uri="bean:processFile"/>
</route>
Copy to Clipboard Toggle word wrap
You can also assign a user name and password to the proxy, if necessary. Please consult the documentation for com.jcraft.jsch.Proxy to discover all options.

Setting preferred SFTP authentication method

If you want to explicitly specify the list of authentication methods that should be used by sftp component, use preferredAuthentications option. If for example you would like Camel to attempt to authenticate with private/public SSH key and fallback to user/password authentication in the case when no public key is available, use the following route configuration:
from("sftp://localhost:9999/root?username=admin&password=admin&preferredAuthentications=publickey,password")
  .to("bean:processFile");
Copy to Clipboard Toggle word wrap

Consuming a single file using a fixed name

When you want to download a single file and knows the file name, you can use fileName=myFileName.txt to tell Camel the name of the file to download. By default the consumer will still do a FTP LIST command to do a directory listing and then filter these files based on the fileName option. Though in this use-case it may be desirable to turn off the directory listing by setting useList=false. For example the user account used to login to the FTP server may not have permission to do a FTP LIST command. So you can turn off this with useList=false, and then provide the fixed name of the file to download with fileName=myFileName.txt, then the FTP consumer can still download the file. If the file for some reason does not exist, then Camel will by default throw an exception, you can turn this off and ignore this by setting ignoreFileNotFoundOrPermissionError=true.
For example to have a Camel route that pickup a single file, and delete it after use you can do
from("ftp://admin@localhost:21/nolist/?password=admin&stepwise=false&useList=false&ignoreFileNotFoundOrPermissionError=true&fileName=report.txt&delete=true")
  .to("activemq:queue:report");
Copy to Clipboard Toggle word wrap
Notice that we have use all the options we talked above above.
You can also use this with ConsumerTemplate. For example to download a single file (if it exists) and grab the file content as a String type:
String data = template.retrieveBodyNoWait("ftp://admin@localhost:21/nolist/?password=admin&stepwise=false&useList=false&ignoreFileNotFoundOrPermissionError=true&fileName=report.txt&delete=true", String.class);
Copy to Clipboard Toggle word wrap

Debug logging

This component has log level TRACE that can be helpful if you have problems.

Chapter 48. GAE

48.1. Introduction to the GAE Components

Apache Camel Components for Google App Engine

Tutorials
The Apache Camel components for Google App Engine (GAE) are part of the camel-gae project and provide connectivity to GAE's cloud computing services. They make the GAE cloud computing environment accessible to applications via Apache Camel interfaces. Following this pattern for other cloud computing environments could make it easier to port Apache Camel applications from one cloud computing provider to another. The following table lists the cloud computing services provided by Google App Engine and the supporting Apache Camel components. The documentation of each component can be found by following the link in the Camel Component column.
Expand
GAE service Camel component Component description
URL fetch service ghttp Provides connectivity to the GAE URL fetch service but can also be used to receive messages from servlets.
Task queueing service gtask Supports asynchronous message processing on GAE by using the task queueing service as message queue.
Mail service gmail Supports sending of emails via the GAE mail service. Receiving mails is not supported yet but will be added later.
Memcache service Not supported yet.
XMPP service Not supported yet.
Images service Not supported yet.
Datastore service Not supported yet.
Accounts service gauth glogin These components interact with the Google Accounts API for authentication and authorization. Google Accounts is not specific to Google App Engine but is often used by GAE applications for implementing security. The gauth component is used by web applications to implement a Google-specific OAuth consumer. This component can also be used to OAuth-enable non-GAE web applications. The glogin component is used by Java clients (outside GAE) for programmatic login to GAE applications. For instructions how to protect GAE applications against unauthorized access refer to the Security for page.

Camel context

Setting up a SpringCamelContext on Google App Engine differs between Camel 2.1 and higher versions. The problem is that usage of the Camel-specific Spring configuration XML schema from the http://camel.apache.org/schema/spring namespace requires JAXB and Camel 2.1 depends on a Google App Engine SDK version that doesn't support JAXB yet. This limitation has been removed since Camel 2.2.
JMX must be disabled in any case because the javax.management package isn't on the App Engine JRE whitelist.

Apache Camel 2.1

camel-gae 2.1 comes with the following CamelContext implementations.
  • org.apache.camel.component.gae.context.GaeDefaultCamelContext (extends org.apache.camel.impl.DefaultCamelContext)
  • org.apache.camel.component.gae.context.GaeSpringCamelContext (extends org.apache.camel.spring.SpringCamelContext)
Both disable JMX before startup. The GaeSpringCamelContext additionally provides setter methods adding route builders as shown in the next example.
appctx.xml
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
    
    <bean id="camelContext" 
        class="org.apache.camel.component.gae.context.GaeSpringCamelContext">
        <property name="routeBuilder" ref="myRouteBuilder" />
    </bean>
    
    <bean id="myRouteBuilder"
        class="org.example.MyRouteBuilder">
    </bean>
    
</beans>
Copy to Clipboard Toggle word wrap
Alternatively, use the routeBuilders property of the GaeSpringCamelContext for setting a list of route builders. Using this approach, a SpringCamelContext can be configured on GAE without the need for JAXB.

Apache Camel 2.2

With Camel 2.2 or higher, applications can use the http://camel.apache.org/schema/spring namespace for configuring a SpringCamelContext but still need to disable JMX. Here's an example.
appctx.xml
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:camel="http://camel.apache.org/schema/spring"
       xsi:schemaLocation="
http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://camel.apache.org/schema/spring
http://camel.apache.org/schema/spring/camel-spring.xsd">
    
    <camel:camelContext id="camelContext">
        <camel:jmxAgent id="agent" disabled="true" />
        <camel:routeBuilder ref="myRouteBuilder"/>
    </camel:camelContext>
    
    <bean id="myRouteBuilder"
        class="org.example.MyRouteBuilder">
    </bean>
    
</beans>
Copy to Clipboard Toggle word wrap

The web.xml

Running Apache Camel on GAE requires usage of the CamelHttpTransportServlet from camel-servlet. The following example shows how to configure this servlet together with a Spring application context XML file.
web.xml
<web-app 
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="
http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
    
    <servlet>
        <servlet-name>CamelServlet</servlet-name>
        <servlet-class>org.apache.camel.component.servlet.CamelHttpTransportServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>appctx.xml</param-value>
        </init-param>
    </servlet>

    <!--
        Mapping used for external requests
     -->
    <servlet-mapping>
        <servlet-name>CamelServlet</servlet-name>
        <url-pattern>/camel/*</url-pattern>
    </servlet-mapping>
    
    <!--
        Mapping used for web hooks accessed by task queueing service.
     -->
    <servlet-mapping>
        <servlet-name>CamelServlet</servlet-name>
        <url-pattern>/worker/*</url-pattern>
    </servlet-mapping>

</web-app>
Copy to Clipboard Toggle word wrap
The location of the Spring application context XML file is given by the contextConfigLocation init parameter. The appctx.xml file must be on the classpath. The servlet mapping makes the Apache Camel application accessible under http://<appname>.appspot.com/camel/... when deployed to Google App Engine where <appname> must be replaced by a real GAE application name. The second servlet mapping is used internally by the task queueing service for background processing via web hooks. This mapping is relevant for the gtask component and is explained there in more detail.

48.2. gauth

gauth Component

Available in Apache Camel 2.3
The gauth component is used by web applications to implement a Google-specific OAuth consumer. It will be later extended to support other OAuth providers as well. Although this component belongs to the Camel Components for Google App Engine (GAE), it can also be used to OAuth-enable non-GAE web applications. For a detailed description of Google's OAuth implementation refer to the Google OAuth API reference.

URI format

gauth://name[?options]
Copy to Clipboard Toggle word wrap
The endpoint name can be either authorize or upgrade. An authorize endpoint is used to obtain an unauthorized request token from Google and to redirect the user to the authorization page. The upgrade endpoint is used to process OAuth callbacks from Google and to upgrade an authorized request token to a long-lived access token. Refer to the usage section for an example.

Options

Expand
Name Default Value Required Description
callback null true (can alternatively be set via GAuthAuthorizeBinding.GAUTH_CALLBACK message header) URL where to redirect the user after having granted or denied access.
scope null true (can alternatively be set via GAuthAuthorizeBinding.GAUTH_SCOPE message header) URL identifying the service(s) to be accessed. Scopes are defined by each Google service; see the service's documentation for the correct value. To specify more than one scope, list each one separated with a comma. Example: http://www.google.com/calendar/feeds/ .
consumerKey null true (can alternatively be set on component-level). Domain identifying the web application. This is the domain used when registering the application with Google. Example: camelcloud.appspot.com. For a non-registered application use anonymous.
consumerSecret null one of consumerSecret or keyLoaderRef is required (can alternatively be set on component-level). Consumer secret of the web application. The consumer secret is generated when when registering the application with Google. It is needed if the HMAC-SHA1 signature method shall be used. For a non-registered application use anonymous.
keyLoaderRef null one of consumerSecret or keyLoaderRef is required (can be alternatively set on component-level) Reference to a private key loader in the registry. Part of camel-gae are two key loaders: GAuthPk8Loader for loading a private key from a PKCS#8 file and GAuthJksLoader to load a private key from a Java key store. It is needed if the RSA-SHA1 signature method shall be used. These classes are defined in the org.apache.camel.component.gae.auth package.
authorizeBindingRef Reference to GAuthAuthorizeBinding false Reference to a OutboundBinding<GAuthEndpoint, GoogleOAuthParameters, GoogleOAuthParameters> in the registry for customizing how an Exchange is bound to GoogleOAuthParameters. This binding is used for teh authorization phase. Most applications won't change the default value.
upgradeBindingRef Reference to GAuthAuthorizeBinding false Reference to a OutboundBinding<GAuthEndpoint, GoogleOAuthParameters, GoogleOAuthParameters> in the registry. for customizing how an Exchange is bound to GoogleOAuthParameters. This binding is used for teh token upgrade phase. Most applications won't change the default value.

Message headers

Expand
Name Type Endpoint Message Description
GAuthAuthorizeBinding.GAUTH_CALLBACK String gauth:authorize in Overrides the callback option.
GAuthAuthorizeBinding.GAUTH_SCOPE String gauth:authorize in Overrides the scope option.
GAuthUpgradeBinding.GAUTH_ACCESS_TOKEN String gauth:upgrade out Contains the long-lived access token. This token should be stored by the applications in context of a user.
GAuthUpgradeBinding.GAUTH_ACCESS_TOKEN_SECRET String gauth:upgrade out Contains the access token secret. This token secret should be stored by the applications in context of a user.

Message body

The gauth component doesn't read or write message bodies.

Component configuration

Some endpoint options such as consumerKey, consumerSecret or keyLoader are usually set to the same values on gauth:authorize and gauth:upgrade endpoints. The gauth component allows to configure them on component-level. These settings are then inherited by gauth endpoints and need not be set redundantly in the endpoint URIs. Here are some configuration examples.
component configuration for a registered web application using the HMAC-SHA1 signature method
<bean id="gauth" class="org.apache.camel.component.gae.auth.GAuthComponent">
    <property name="consumerKey" value="example.appspot.com" />
    <property name="consumerSecret" value="QAtA...HfQ" />
</bean>

Copy to Clipboard Toggle word wrap
component configuration for an unregistered web application using the HMAC-SHA1 signature method
<bean id="gauth" class="org.apache.camel.component.gae.auth.GAuthComponent">
    <!-- Google will display a warning message on the authorization page -->
    <property name="consumerKey" value="anonymous" />
    <property name="consumerSecret" value="anonymous" />
</bean>

Copy to Clipboard Toggle word wrap
component configuration for a registered web application using the RSA-SHA1 signature method
<bean id="gauth" class="org.apache.camel.component.gae.auth.GAuthComponent">
    <property name="consumerKey" value="ipfcloud.appspot.com" />
    <property name="keyLoader" ref="jksLoader" />
    <!--<property name="keyLoader" ref="pk8Loader" />-->
</bean>

<!-- Loads the private key from a Java key store -->
<bean id="jksLoader"
    class="org.apache.camel.component.gae.auth.GAuthJksLoader">
    <property name="keyStoreLocation" value="myKeytore.jks" />
    <property name="keyAlias" value="myKey" />
    <property name="keyPass" value="myKeyPassword" />
    <property name="storePass" value="myStorePassword" />
</bean>

<!-- Loads the private key from a PKCS#8 file -->
<bean id="pk8Loader"
    class="org.apache.camel.component.gae.auth.GAuthPk8Loader">
    <property name="keyStoreLocation" value="myKeyfile.pk8" />
</bean>

Copy to Clipboard Toggle word wrap

Usage

Here's the minimum setup for adding OAuth to a (non-GAE) web application. In the following example, it is assumed that the web application is running on gauth.example.org.
GAuthRouteBuilder.java
import java.net.URLEncoder;
import org.apache.camel.builder.RouteBuilder;

public class GAuthRouteBuilder extends RouteBuilder {

    @Override
    public void configure() throws Exception {

        // Calback URL to redirect user from Google Authorization back to the web application
        String encodedCallback = URLEncoder.encode("https://gauth.example.org:8443/handler", "UTF-8");
        // Application will request for authorization to access a user's Google Calendar
        String encodedScope = URLEncoder.encode("http://www.google.com/calendar/feeds/", "UTF-8");

        // Route 1: A GET request to http://gauth.example.org/authorize will trigger the the OAuth
        // sequence of interactions. The gauth:authorize endpoint obtains an unauthorized request
        // token from Google and then redirects the user (browser) to a Google authorization page.
        from("jetty:http://0.0.0.0:8080/authorize")
            .to("gauth:authorize?callback=" + encodedCallback + "&scope=" + encodedScope);

        // Route 2: Handle callback from Google. After the user granted access to Google Calendar
        // Google redirects the user to https://gauth.example.org:8443/handler (see callback) along
        // with an authorized request token. The gauth:access endpoint exchanges the authorized
        // request token against a long-lived access token.
        from("jetty:https://0.0.0.0:8443/handler")
            .to("gauth:upgrade")
            // The access token can be obtained from
            // exchange.getOut().getHeader(GAuthUpgradeBinding.GAUTH_ACCESS_TOKEN)
            // The access token secret can be obtained from
            // exchange.getOut().getHeader(GAuthUpgradeBinding.GAUTH_ACCESS_TOKEN_SECRET)
            .process(/* store the tokens in context of the current user ... */);
    }

}

Copy to Clipboard Toggle word wrap
The OAuth sequence is triggered by sending a GET request to http://gauth.example.org/authorize . The user is then redirected to a Google authorization page. After having granted access on this page, Google redirects the user to the web application which handles the callback and finally obtains a long-lived access token from Google.
These two routes can perfectly co-exist with any other web application framework. The framework provides the basis for web application-specific functionality whereas the OAuth service provider integration is done with Apache Camel. The OAuth integration part could even use resources from an existing servlet container by using the servlet component instead of the jetty component.
What to do with the OAuth access token?
  • Application should store the access token in context of the current user. If the user logs in next time, the access token can directly be loaded from the database, for example, without doing the OAuth dance again.
  • The access token is then used to get access to Google services, such as a Google Calendar API, on behalf of the user. Java applications will most likely use the GData Java library for that. See below for an example how to use the access token with the GData Java library to read a user's calendar feed.
  • The user can revoke the access token at any time from his Google Accounts page. In this case, access to the corresponding Google service will throw an authorization exception. The web application should remove the stored access token and redirect the user again to the Google authorization page for creating another one.
The above example relies on the following component configuration.
<bean id="gauth" class="org.apache.camel.component.gae.auth.GAuthComponent">
    <property name="consumerKey" value="anonymous" />
    <property name="consumerSecret" value="anonymous" />
</bean>

Copy to Clipboard Toggle word wrap
If you don't want that Google displays a warning message on the authorization page, you'll need to register your web application and change the consumerKey and consumerSecret settings.

GAE example

To OAuth-enable a Google App Engine application, only some small changes in the route builder are required. Assuming the GAE application hostname is camelcloud.appspot.com a configuration might look as follows. Here, the ghttp component is used to handle HTTP(S) requests instead of the jetty component.
GAuthRouteBuilder
import java.net.URLEncoder;
import org.apache.camel.builder.RouteBuilder;

public class TutorialRouteBuilder extends RouteBuilder {

    @Override
    public void configure() throws Exception {

        String encodedCallback = URLEncoder.encode("https://camelcloud.appspot.com/handler", "UTF-8");
        String encodedScope = URLEncoder.encode("http://www.google.com/calendar/feeds/", "UTF-8");

        from("ghttp:///authorize")
            .to("gauth:authorize?callback=" + encodedCallback + "&scope=" + encodedScope);

        from("ghttp:///handler")
            .to("gauth:upgrade")
            .process(/* store the tokens in context of the current user ... */);
    }

}

Copy to Clipboard Toggle word wrap

Access token usage

Here's an example how to use an access token to access a user's Google Calendar data with the GData Java library. The example application writes the titles of the user's public and private calendars to stdout.
Access token usage
import com.google.gdata.client.authn.oauth.OAuthHmacSha1Signer;
import com.google.gdata.client.authn.oauth.OAuthParameters;
import com.google.gdata.client.calendar.CalendarService;
import com.google.gdata.data.calendar.CalendarEntry;
import com.google.gdata.data.calendar.CalendarFeed;

import java.net.URL;

public class AccessExample {

    public static void main(String... args) throws Exception {
        String accessToken = ...
        String accessTokenSecret = ...

        CalendarService myService = new CalendarService("exampleCo-exampleApp-1.0");
        OAuthParameters params = new OAuthParameters();
        params.setOAuthConsumerKey("anonymous");
        params.setOAuthConsumerSecret("anonymous");
        params.setOAuthToken(accessToken);
        params.setOAuthTokenSecret(accessTokenSecret);
        myService.setOAuthCredentials(params, new OAuthHmacSha1Signer());

        URL feedUrl = new URL("http://www.google.com/calendar/feeds/default/");
        CalendarFeed resultFeed = myService.getFeed(feedUrl, CalendarFeed.class);

        System.out.println("Your calendars:");
        System.out.println();

        for (int i = 0; i < resultFeed.getEntries().size(); i++) {
            CalendarEntry entry = resultFeed.getEntries().get(i);
            System.out.println(entry.getTitle().getPlainText());
        }
    }
}
Copy to Clipboard Toggle word wrap

48.3. ghttp

ghttp Component

The ghttp component contributes to the Camel Components for Google App Engine (GAE). It provides connectivity to the GAE URL fetch service but can also be used to receive messages from servlets (the only way to receive HTTP requests on GAE). This is achieved by extending the Servlet component. As a consequence, ghttp URI formats and options sets differ on the consumer-side (from) and producer-side (to).

URI format

Expand
Format Context Comment
ghttp:///path[?options]
Copy to Clipboard Toggle word wrap
Consumer See also Servlet component
ghttp://hostname[:port][/path][?options]
ghttps://hostname[:port][/path][?options]
Copy to Clipboard Toggle word wrap
Producer See also Http component

Options

Expand
Name Default Value Context Description
bridgeEndpoint true Producer If set to true the Exchange.HTTP_URI header will be ignored. To override the default endpoint URI with the Exchange.HTTP_URI header set this option to false.
throwExceptionOnFailure true Producer Throw a org.apache.camel.component.gae.http if the response code is >= 400. To disable throwing an exception set this option to false.
inboundBindingRef reference to GHttpBinding Consumer Reference to an InboundBinding<GHttpEndpoint, HttpServletRequest, HttpServletResponse> in the Registry for customizing the binding of an Exchange to the Servlet API. The referenced binding is used as post-processor to org.apache.camel.component.http.HttpBinding.
outboundBindingRef reference to GHttpBinding Producer Reference to an OutboundBinding<GHttpEndpoint, HTTPRequest, HTTPResponse> in the Registry for customizing the binding of an Exchange to the URLFetchService.
On the consumer-side, all options of the Servlet component are supported.

Message headers

On the producer side, the following headers of the Http component are supported.
Expand
Name Type Description
Exchange.CONTENT_TYPE String The HTTP content type. Is set on both the in and out message to provide a content type, such as text/html.
Exchange.CONTENT_ENCODING String The HTTP content encoding. Is set on both the in and out message to provide a content encoding, such as gzip.
Exchange.HTTP_METHOD String The HTTP method to execute. One of GET, POST, PUT and DELETE. If not set, POST will be used if the message body is not null, GET otherwise.
Exchange.HTTP_QUERY String Overrides the query part of the endpoint URI or the the query part of Exchange.HTTP_URI (if defined). The query string must be in decoded form.
Exchange.HTTP_URI String Overrides the default endpoint URI if the bridgeEndpoint option is set to false. The URI string must be in decoded form.
Exchange.RESPONSE_CODE int The HTTP response code from URL fetch service responses.
On the consumer-side all headers of the Servlet component component are supported.

Message body

On the producer side the in message body is converted to a byte[]. The out message body is made available as InputStream. If the reponse size exceeds 1 megabyte a ResponseTooLargeException is thrown by the URL fetch service (see quotas and limits).

Receiving messages

For receiving messages via the ghttp component, a CamelHttpTransportServlet must be configured and mapped in the application's web.xml (see the section called “The web.xml”). For example, to handle requests targeted at http://<appname>.appspot.com/camel/* or http://localhost/camel/* (when using a local development server) the following servlet mapping must be defined:
web.xml
    ...
    <servlet>
        <servlet-name>CamelServlet</servlet-name>
        <servlet-class>org.apache.camel.component.servlet.CamelHttpTransportServlet</servlet-class>
        ...
    </servlet>
    ...
    <servlet-mapping>
        <servlet-name>CamelServlet</servlet-name>
        <url-pattern>/camel/*</url-pattern>
    </servlet-mapping>
    ...
Copy to Clipboard Toggle word wrap
Endpoint URI path definitions are relative to this servlet mapping e.g. the route
from("ghttp:///greeting").transform().constant("Hello")
Copy to Clipboard Toggle word wrap
processes requests targeted at http://<appname>.appspot.com/camel/greeting. In this example, the request body is ignored and the response body is set to Hello. Requests targeted at http://<appname>.appspot.com/camel/greeting/* are not processed by default. This requires setting the option matchOnUriPrefix to true.
from("ghttp:///greeting?matchOnUriPrefix=true").transform().constant("Hello")
Copy to Clipboard Toggle word wrap

Sending messages

For sending resquests to external HTTP services the ghttp component uses the URL fetch service. For example, the Apache Camel homepage can the retrieved with the following endpoint definition on the producer-side.
from(...)
...
.to("ghttp://camel.apache.org")
...
Copy to Clipboard Toggle word wrap
The HTTP method used depends on the Exchange.HTTP_METHOD message header or on the presence of an in-message body (GET if null, POST otherwise). Retrieving the Camel homepage via a GAE application is as simple as
from("ghttp:///home")
.to("ghttp://camel.apache.org")
Copy to Clipboard Toggle word wrap
Sending a GET request to http://<appname>.appspot.com/camel/home returns the Camel homepage. HTTPS-based communication with external services can be enabled with the ghttps scheme.
from(...)
...
.to("ghttps://svn.apache.org/repos/asf/camel/trunk/")
...
Copy to Clipboard Toggle word wrap

Dependencies

Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-gae</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Apache Camel (2.1.0 or higher).

48.4. glogin

glogin Component

Available in Apache Camel 2.3 (or latest development snapshot).
The glogin component is used by Apache Camel applications outside Google App Engine (GAE) for programmatic login to GAE applications. It is part of the Chapter 48, GAE. Security-enabled GAE applications normally redirect the user to a login page. After submitting username and password for authentication, the user is redirected back to the application. That works fine for applications where the client is a browser. For all other applications, the login process must be done programmatically. All the necessary steps for programmatic login are implemented by the glogin component. These are
  1. Get an authentication token from Google Accounts via the ClientLogin API.
  2. Get an authorization cookie from Google App Engine's login API.
The authorization cookie must then be send with subsequent HTTP requests to the GAE application. It expires after 24 hours and must then be renewed.

URI format

glogin://hostname[:port][?options]
Copy to Clipboard Toggle word wrap
The hostname is either the internet hostname of a GAE application (e.g. camelcloud.appspot.com) or the name of the host where the development server is running (e.g. localhost). The port is only used when connecting to a development server (i.e. when devMode=true, see options) and defaults to 8080.

Options

Expand
Name Default Value Required Description
clientName apache-camel-2.x false A client name with recommended (but not required) format <organization>\-<appname>\-<version>.
userName null true (can alternatively be set via GLoginBinding.GLOGIN_USER_NAME message header) Login username (an email address).
password null true (can alternatively be set via GLoginBinding.GLOGIN_PASSWORD message header) Login password.
devMode false false If set to true a login to a development server is attempted.
devAdmin false false If set to true a login to a development server in admin role is attempted.

Message headers

Expand
Name Type Message Description
GLoginBinding.GLOGIN_HOST_NAME String in Overrides the hostname defined in the endpoint URI.
GLoginBinding.GLOGIN_USER_NAME String in Overrides the userName option.
GLoginBinding.GLOGIN_PASSWORD String in Overrides the password option.
GLoginBinding.GLOGIN_TOKEN String out Contains the authentication token obtained from Google Accounts. Login to a development server does not set this header.
GLoginBinding.GLOGIN_COOKIE String out Contains the application-specific authorization cookie obtained from Google App Engine (or a development server).

Message body

The glogin component doesn't read or write message bodies.

Usage

The following JUnit test show an example how to login to a development server as well as to a deployed GAE application located at http://camelcloud.appspot.com.
GLoginTest.java
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.ProducerTemplate;
import org.junit.Ignore;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import static org.apache.camel.component.gae.login.GLoginBinding.*;
import static org.junit.Assert.*;

public class GLoginTest {

    private ProducerTemplate template = ...

    @Test
    public void testDevLogin() {
        Exchange result = template.request("glogin://localhost:8888?userName=test@example.org&devMode=true", null);
        assertNotNull(result.getOut().getHeader(GLOGIN_COOKIE));
    }

    @Test
    public void testRemoteLogin() {
        Exchange result = template.request("glogin://camelcloud.appspot.com", new Processor() {
            public void process(Exchange exchange) throws Exception {
                exchange.getIn().setHeader(GLOGIN_USER_NAME, "replaceme@gmail.com");
                exchange.getIn().setHeader(GLOGIN_PASSWORD, "replaceme");
            }
        });
        assertNotNull(result.getOut().getHeader(GLOGIN_COOKIE));
    }

}
Copy to Clipboard Toggle word wrap
The resulting authorization cookie from login to a development server looks like
ahlogincookie=test@example.org:false:11223191102230730701;Path=/
Copy to Clipboard Toggle word wrap
The resulting authorization cookie from login to a deployed GAE application looks (shortened) like
ACSID=AJKiYcE...XxhH9P_jR_V3; expires=Sun, 07-Feb-2010 15:14:51 GMT; path=/
Copy to Clipboard Toggle word wrap

48.5. gmail

gmail Component

The gmail component contributes to the Camel Components for Google App Engine (GAE). It supports sending of emails via the GAE mail service. Receiving mails is not supported yet but will be added later. Currently, only Google accounts that are application administrators can send emails.

URI format

gmail://user@gmail.com[?options]
gmail://user@googlemail.com[?options]
Copy to Clipboard Toggle word wrap

Options

Expand
Name Default Value Context Description
to null Producer To-receiver of the email. This can be a single receiver or a comma-separated list of receivers.
cc null Producer Cc-receiver of the email. This can be a single receiver or a comma-separated list of receivers.
bcc null Producer Bcc-receiver of the email. This can be a single receiver or a comma-separated list of receivers.
subject null Producer Subject of the email.
outboundBindingRef reference to GMailBinding Producer Reference to an OutboundBinding<GMailEndpoint, MailService.Message, void> in the Registry for customizing the binding of an Exchange to the mail service.

Message headers

Expand
Name Type Context Description
GMailBinding.GMAIL_SUBJECT String Producer Subject of the email. Overrides subject endpoint option.
GMailBinding.GMAIL_SENDER String Producer Sender of the email. Overrides sender definition in endpoint URI.
GMailBinding.GMAIL_TO String Producer To-receiver(s) of the email. Overrides to endpoint option.
GMailBinding.GMAIL_CC String Producer Cc-receiver(s) of the email. Overrides cc endpoint option.
GMailBinding.GMAIL_BCC String Producer Bcc-receiver(s) of the email. Overrides bcc endpoint option.

Message body

On the producer side the in message body is converted to a String.

Usage

...
.setHeader(GMailBinding.GMAIL_SUBJECT, constant("Hello"))
.setHeader(GMailBinding.GMAIL_TO, constant("account2@somewhere.com"))
.to("gmail://account1@gmail.com");
Copy to Clipboard Toggle word wrap
Sends an email with subject Hello from account1@gmail.com to account2@somewhere.com. The mail message body is taken from the in message body. Please note that account1@gmail.com must be an administrator account for the current GAE application.

Dependencies

Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-gae</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where $\{camel-version\} must be replaced by the actual version of Apache Camel (2.1.0 or higher).

48.6. gsec

Security for Apache Camel GAE Applications

Securing GAE applications from unauthorized access is described in the Security and Authentication section of the Google App Engine documentation. Authorization constraints are declared in the web.xml file (see the section called “The web.xml”). This applies to Apache Camel applications as well. In the following example, the application is configured to only allow authenticated users (in any role) to access the application. Additionally, access to /worker/\* URLs masy only be done by users in the admin role. By default, web hook URLs installed by the gtask component match the /worker/\* pattern and should not be accessed by normal users. With this authorization constraint, only the task queuing service (which is always in the admin role) is allowed to access the web hooks. For implementing custom, non-declarative authorization logic, Apache Camel GAE applications should use the Google Accounts Java API.

Example 48.1. web.xml with authorization constraint

<web-app 
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="
http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
    
    <servlet>
        <servlet-name>CamelServlet</servlet-name>
        <servlet-class>org.apache.camel.component.servlet.CamelHttpTransportServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>appctx.xml</param-value>
        </init-param>
    </servlet>

    <!--
        Mapping used for external requests
     -->
    <servlet-mapping>
        <servlet-name>CamelServlet</servlet-name>
        <url-pattern>/camel/*</url-pattern>
    </servlet-mapping>
    
    <!--
        Mapping used for web hooks accessed by task queueing service.
     -->
    <servlet-mapping>
        <servlet-name>CamelServlet</servlet-name>
        <url-pattern>/worker/*</url-pattern>
    </servlet-mapping>

    <!--
        By default allow any user who is logged in to access the whole 
        application.
     -->
    <security-constraint>
        <web-resource-collection>
            <url-pattern>/*</url-pattern>
        </web-resource-collection>
        <auth-constraint>
            <role-name>*</role-name>
        </auth-constraint>
    </security-constraint>

    <!--
        Allow only admin users to access /worker/* URLs e.g. to prevent
        normal user to access gtask web hooks.
     -->
    <security-constraint>
        <web-resource-collection>
            <url-pattern>/worker/*</url-pattern>
        </web-resource-collection>
        <auth-constraint>
            <role-name>admin</role-name>
        </auth-constraint>
    </security-constraint>

</web-app>
Copy to Clipboard Toggle word wrap

48.7. gtask

gtask Component

The gtask component contributes to the Camel Components for Google App Engine (GAE). It supports asynchronous message processing on GAE by using the task queueing service as message queue. For adding messages to a queue it uses the task queue API. For receiving messages from a queue it installs an HTTP callback handler. The handler is called by an HTTP POST callback (a web hook) initiated by the task queueing service. Whenever a new task is added to a queue a callback will be sent. The gtask component abstracts from these details and supports endpoint URIs that make message queueing on GAE as easy as message queueing with JMS or SEDA.

URI format

gtask://queue-name
Copy to Clipboard Toggle word wrap

Options

Expand
Name Default Value Context Description
workerRoot worker Producer The servlet mapping for callback handlers. By default, this component requires a callback servlet mapping of /worker/*. If another servlet mapping is used e.g. /myworker/* it must be set as option on the producer side: to("gtask:myqueue?workerRoot=myworker").
inboundBindingRef reference to GTaskBinding Consumer Reference to an InboundBinding<GTaskEndpoint, HttpServletRequest, HttpServletResponse> in the Registry for customizing the binding of an Exchange to the Servlet API. The referenced binding is used as post-processor to org.apache.camel.component.http.HttpBinding.
outboundBindingRef reference to GTaskBinding Producer Reference to an OutboundBinding<GTaskEndpoint, TaskOptions, void> in the Registry for customizing the binding of an Exchange to the task queueing service.
On the consumer-side, all options of the Servlet component are supported.

Message headers

On the consumer-side all headers of the Servlet component component are supported plus the following.
Expand
Name Type Context Description
GTaskBinding.GTASK_QUEUE_NAME String Consumer Name of the task queue.
GTaskBinding.GTASK_TASK_NAME String Consumer Name of the task (generated value).
GTaskBinding.GTASK_RETRY_COUNT int Consumer Number of callback retries.

Message body

On the producer side the in message body is converted to a byte[] and is POSTed to the callback handler as content-type application/octet-stream.

Usage

Setting up tasks queues is an administrative task on Google App Engine. Only one queue is pre-configured and can be referenced by name out-of-the-box: the default queue. This queue will be used in the following examples. Please note that when using task queues on the local development server, tasks must be executed manually from the developer console.

Default queue

...
.to(gtask:default) // add message to default queue

from(gtask:default) // receive message from default queue (via a web hook)
...
Copy to Clipboard Toggle word wrap
This example requires the following servlet mapping.
web.xml
    ...
    <servlet>
        <servlet-name>CamelServlet</servlet-name>
        <servlet-class>org.apache.camel.component.servlet.CamelHttpTransportServlet</servlet-class>
        ...
    </servlet>
    ...
    <servlet-mapping>
        <servlet-name>CamelServlet</servlet-name>
        <url-pattern>/worker/*</url-pattern>
    </servlet-mapping>
    ...
Copy to Clipboard Toggle word wrap

Dependencies

Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-gae</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Apache Camel (2.1.0 or higher).

Chapter 49. Geocoder

Geocoder Component

Available as of Camel 2.12
The geocoder: component is used for looking up geocodes (latitude and longitude) for a given address, or reverse lookup. The component uses the Java API for Google Geocoder library.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-geocoder</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

geocoder:address:name[?options]
geocoder:latlng:latitude,longitude[?options]
Copy to Clipboard Toggle word wrap

Options

Expand
Property Default Description
language en The language to use.
headersOnly false Whether to only enrich the Exchange with headers, and leave the body as-is.
clientId To use google premium with this client id
clientKey To use google premium with this client key
You can append query options to the URI in the following format, ?option=value&option=value&...

Exchange data format

Camel will deliver the body as a com.google.code.geocoder.model.GeocodeResponse type. And if the address is "current" then the response is a String type with a JSON representation of the current location.
If the option headersOnly is set to true then the message body is left as-is, and only headers will be added to the Exchange.

Message Headers

Expand
Header Description
CamelGeoCoderStatus Mandatory. Status code from the geocoder library. If status is GeocoderStatus.OK then additional headers is enriched
CamelGeoCoderAddress The formatted address
CamelGeoCoderLat The latitude of the location.
CamelGeoCoderLng The longitude of the location.
CamelGeoCoderLatlng The latitude and longitude of the location. Separated by comma.
CamelGeoCoderCity The city long name.
CamelGeoCoderRegionCode The region code.
CamelGeoCoderRegionName The region name.
CamelGeoCoderCountryLong The country long name.
CamelGeoCoderCountryShort The country short name.
Notice not all headers may be provided depending on available data and mode in use (address vs latlng).

Samples

In the example below we get the latitude and longitude for Paris, France
  from("direct:start")
    .to("geocoder:address:Paris, France")
Copy to Clipboard Toggle word wrap
If you provide a header with the CamelGeoCoderAddress then that overrides the endpoint configuration, so to get the location of Copenhagen, Denmark we can send a message with a headers as shown:
template.sendBodyAndHeader("direct:start", "Hello", GeoCoderConstants.ADDRESS, "Copenhagen, Denmark");
Copy to Clipboard Toggle word wrap
To get the address for a latitude and longitude we can do:
  from("direct:start")
    .to("geocoder:latlng:40.714224,-73.961452")
    .log("Location ${header.CamelGeocoderAddress} is at lat/lng: ${header.CamelGeocoderLatlng} and in country ${header.CamelGeoCoderCountryShort}")
Copy to Clipboard Toggle word wrap
Which will log
Location 285 Bedford Avenue, Brooklyn, NY 11211, USA is at lat/lng: 40.71412890,-73.96140740 and in country US
Copy to Clipboard Toggle word wrap
To get the current location you can use "current" as the address as shown:
  from("direct:start")
    .to("geocoder:address:current")
Copy to Clipboard Toggle word wrap

Chapter 50. GitHub

GitHub component

Available as of Camel 2.15
The GitHub component interacts with the GitHub API by encapsulating egit-github. It currently provides polling for new pull requests, pull request comments, tags, and commits. It is also able to produce comments on pull requests, as well as close the pull request entirely.
Rather than webhooks, this endpoint relies on simple polling. Reasons include:
  • Concern for reliability/stability
  • The types of payloads we're polling aren't typically large (plus, paging is available in the API)
  • The need to support apps running somewhere not publicly accessible where a webhook would fail
Note that the GitHub API is fairly expansive. Therefore, this component could be easily expanded to provide additional interactions.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-github</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap

URI format

gihub://endpoint[?options]
Copy to Clipboard Toggle word wrap

Mandatory Options:

Note that these can be configured directly through the endpoint.
Expand
Option
Description
username
GitHub username, required unless oauthToken is provided
password
GitHub password, required unless oauthToken is provided
oauthToken
GitHub OAuth token, required unless username & password are provided
repoOwner
GitHub repository owner (organization)
repoName GitHub repository name

Consumer Endpoints:

Expand
Endpoint
Context
Body Type
pullRequest
polling
org.eclipse.egit.github.core.PullRequest
pullRequestComment
polling
org.eclipse.egit.github.core.Comment (comment on the general pull request discussion) or org.eclipse.egit.github.core.CommitComment (inline comment on a pull request diff)
tag
polling
org.eclipse.egit.github.core.RepositoryTag
commit
polling
org.eclipse.egit.github.core.RepositoryCommit

Producer Endpoints:

Expand
Endpoint
Body
Message Headers
pullRequestComment
String (comment text)
  • GitHubPullRequest (integer) (REQUIRED): Pull request number.
  • GitHubInResponseTo (integer): Required if responding to another inline comment on the pull request diff. If left off, a general comment on the pull request discussion is assumed.
closePullRequest
none
  • GitHubPullRequest (integer) (REQUIRED): Pull request number.

URI Options

Expand
Name
Default Value
Description
delay
60
in seconds

Chapter 51. GoogleCalendar

GoogleCalendar component

Available as of Camel 2.15

Component Description

The Google Calendar component provides access to Google Calendar via the Google Calendar Web APIs.
Google Calendar uses the OAuth 2.0 protocol for authenticating a Google account and authorizing access to user data. Before you can use this component, you will need to create an account and generate OAuth credentials. Credentials comprise of a clientId, clientSecret, and a refreshToken. A handy resource for generating a long-lived refreshToken is the OAuth playground.
Maven users will need to add the following dependency to their pom.xml for this component:
    <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-google-calendar</artifactId>
            <version>2.15-SNAPSHOT</version>
    </dependency>
Copy to Clipboard Toggle word wrap

URI Format

The GoogleCalendar Component uses the following URI format:
google-calendar://endpoint-prefix/endpoint?[options]
Copy to Clipboard Toggle word wrap
Endpoint prefix can be one of:
  • acl
  • calendars
  • channels
  • colors
  • events
  • freebusy
  • list
  • settings

GoogleCalendarComponent

The GoogleCalendar Component can be configured with the options below. These options can be provided using the component's bean property configuration of type org.apache.camel.component.google.calendar.GoogleCalendarConfiguration.
Expand
Option Type
accessToken String OAuth 2 access token. This typically expires after an hour so refreshToken is recommended for long term usage.
applicationName String Google calendar application name. Example would be "camel-google-calendar/1.0"
clientId String Client ID of the calendar application
clientSecret String Client secret of the calendar application
refreshToken
String
OAuth 2 refresh token. Using this, the Google Calendar component can obtain a new accessToken whenever the current one expires - a necessity if the application is long-lived.
scopes List<String> Specifies the level of permissions you want a calendar application to have to a user account. See https://developers.google.com/google-apps/calendar/auth for more info.

Producer Endpoints

Producer endpoints can use endpoint prefixes followed by endpoint names and associated options described next. A shorthand alias can be used for some endpoints. The endpoint URI MUST contain a prefix.
Endpoint options that are not mandatory are denoted by []. When there are no mandatory options for an endpoint, one of the set of [] options MUST be provided. Producer endpoints can also use a special option inBody that in turn should contain the name of the endpoint option whose value will be contained in the Camel Exchange In message.
Any of the endpoint options can be provided in either the endpoint URI, or dynamically in a message header. The message header name must be of the format CamelGoogleCalendar.<option>. Note that the inBody option overrides message header, i.e. the endpoint option inBody=option would override a CamelGoogleCalendar.option header.

1. Endpoint Prefix acl

The following endpoints can be invoked with the prefix acl as follows:
google-calendar://acl/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
delete calendarId, ruleId
get calendarId, ruleId com.google.api.services.calendar.model.AclRule
insert calendarId, content com.google.api.services.calendar.model.AclRule
list calendarId com.google.api.services.calendar.model.Acl
patch calendarId, content, ruleId com.google.api.services.calendar.model.AclRule
update calendarId, content, ruleId com.google.api.services.calendar.model.AclRule
watch calendarId, contentChannel com.google.api.services.calendar.model.Channel

URI Options for acl

Expand
Name Type
calendarId String
content com.google.api.services.calendar.model.AclRule
contentChannel com.google.api.services.calendar.model.Channel
ruleId String

2. Endpoint Prefix calendars

The following endpoints can be invoked with the prefix calendars as follows:
google-calendar://calendars/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
clear calendarId
delete calendarId
get calendarId com.google.api.services.calendar.Calendar
insert content com.google.api.services.calendar.Calendar
patch calendarId, content com.google.api.services.calendar.Calendar
update calendarId, content com.google.api.services.calendar.Calendar

URI Options for calendars

Expand
Name Type
calendarId String
content com.google.api.services.calendar.model.Calendar

3. Endpoint Prefix channels

The following endpoints can be invoked with the prefix channels as follows:
google-calendar://channels/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
stop contentChannel

URI Options for channels

Expand
Name Type
contentChannel com.google.api.services.calendar.model.Channel

4. Endpoint Prefix colors

The following endpoints can be invoked with the prefix colors as follows:
google-calendar://colors/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
get com.google.api.services.calendar.model.Colors

URI Options for colors

Expand
Name Type

5. Endpoint Prefix events

The following endpoints can be invoked with the prefix events as follows:
        google-calendar://events/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
calendarImport calendarId, content com.google.api.services.calendar.model.Event
delete calendarId, eventId
get calendarId, eventId com.google.api.services.calendar.model.Event
insert calendarId, content com.google.api.services.calendar.model.Event
instances calendarId, eventId com.google.api.services.calendar.model.Events
list calendarId com.google.api.services.calendar.model.Events
move calendarId, destination, eventId com.google.api.services.calendar.model.Event
patch calendarId, content, eventId com.google.api.services.calendar.model.Event
quickAdd calendarId, text com.google.api.services.calendar.model.Event
update calendarId, content, eventId com.google.api.services.calendar.model.Event
watch calendarId, contentChannel com.google.api.services.calendar.model.Channel

URI Options for events

Expand
Name Type
calendarId String
content com.google.api.services.calendar.model.Event
contentChannel com.google.api.services.calendar.model.Channel
destination String
eventId String
text String

6. Endpoint Prefix freebusy

The following endpoints can be invoked with the prefix freebusy as follows:
        google-calendar://freebusy/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
query content com.google.api.services.calendar.model.FreeBusyResponse

URI Options for freebusy

Expand
Name Type
content com.google.api.services.calendar.model.FreeBusyRequest

7. Endpoint Prefix list

The following endpoints can be invoked with the prefix list as follows:
google-calendar://list/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
delete calendarId
get calendarId com.google.api.services.calendar.model.CalendarListEntry
insert content com.google.api.services.calendar.model.CalendarListEntry
list com.google.api.services.calendar.model.CalendarList
patch calendarId, content com.google.api.services.calendar.model.CalendarListEntry
update calendarId, content com.google.api.services.calendar.model.CalendarListEntry
watch contentChannel com.google.api.services.calendar.model.Channel

URI Options for list

Expand
Name Type
calendarId String
content com.google.api.services.calendar.model.CalendarListEntry
contentChannel com.google.api.services.calendar.model.Channel

8. Endpoint Prefix settings

The following endpoints can be invoked with the prefix settings as follows:
        google-calendar://settings/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
get setting com.google.api.services.calendar.model.Setting
list com.google.api.services.calendar.model.Settings
watch contentChannel com.google.api.services.calendar.model.Channel

URI Options for settings

Expand
Name Type
contentChannel com.google.api.services.calendar.model.Channel
setting String

Consumer Endpoints

Any of the producer endpoints can be used as a consumer endpoint. Consumer endpoints can use Scheduled Poll Consumer Options with a consumer. prefix to schedule endpoint invocation. Consumer endpoints that return an array or collection will generate one exchange per element, and their routes will be executed once for each exchange.

Message Headers

Any URI option can be provided in a message header for producer endpoints with a CamelGoogleCalendar. prefix.

Message Body

All result message bodies utilize objects provided by the underlying APIs used by the GoogleCalendarComponent. Producer endpoints can specify the option name for incoming message body in the inBody endpoint URI parameter. For endpoints that return an array or collection, a consumer endpoint will map every element to distinct messages.

Chapter 52. GoogleDrive

GoogleDrive Component

Available as of Camel 2.14
The Google Drive component provides access to the Google Drive file storage service via the Google Drive Web APIs.
Google Drive uses the OAuth 2.0 protocol for authenticating a Google account and authorizing access to user data. Before you can use this component, you will need to create an account and generate OAuth credentials. Credentials comprise of a clientId, clientSecret, and a refreshToken. A handy resource for generating a long-lived refreshToken is the OAuth playground.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-google-drive</artifactId>
        <version>2.14-SNAPSHOT</version>
</dependency>
Copy to Clipboard Toggle word wrap

URI Format

The GoogleDrive Component uses the following URI format:
google-drive://endpoint-prefix/endpoint?[options]
Copy to Clipboard Toggle word wrap
Endpoint prefix can be one of:
  • drive-about
  • drive-apps
  • drive-changes
  • drive-channels
  • drive-children
  • drive-comments
  • drive-files
  • drive-parents
  • drive-permissions
  • drive-properties
  • drive-realtime
  • drive-replies
  • drive-revisions

GoogleDriveComponent

The GoogleDrive Component can be configured with the options below. These options can be provided using the component's bean property configuration of type org.apache.camel.component.google.drive.GoogleDriveConfiguration.
Expand
Option Type Description
accessToken String OAuth 2 access token. This typically expires after an hour so refreshToken is recommended for long term usage.
applicationName String Google drive application name. Example would be camel-google-drive/1.0.
clientId String Client ID of the drive application
clientSecret String Client secret of the drive application
refreshToken
String
OAuth 2 refresh token. Using this, the Google Drive component can obtain a new accessToken whenever the current one expires - a necessity if the application is long-lived.
scopes List<String> Specifies the level of permissions you want a drive application to have to a user account. See https://developers.google.com/drive/web/scopes for more info.

Producer Endpoints

Producer endpoints can use endpoint prefixes followed by endpoint names and associated options described next. A shorthand alias can be used for some endpoints. The endpoint URI MUST contain a prefix.
Endpoint options that are not mandatory are denoted by []. When there are no mandatory options for an endpoint, one of the set of [] options MUST be provided. Producer endpoints can also use a special option inBody that in turn should contain the name of the endpoint option whose value will be contained in the Camel Exchange In message.
Any of the endpoint options can be provided in either the endpoint URI, or dynamically in a message header. The message header name must be of the format CamelGoogleDrive.<option>. Note that the inBody option overrides message header, i.e. the endpoint option inBody=option would override a CamelGoogleDrive.option header.
For more information on the endpoints and options see API documentation at: https://developers.google.com/drive/v2/reference/

1. Endpoint Prefix drive-about

The following endpoints can be invoked with the prefix drive-about as follows:
google-drive://drive-about/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
get com.google.api.services.drive.model.About

URI Options for drive-about

Expand
Name Type

2. Endpoint Prefix drive-apps

The following endpoints can be invoked with the prefix drive-apps as follows:
google-drive://drive-apps/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
get appId com.google.api.services.drive.model.App
list com.google.api.services.drive.model.AppList

URI Options for drive-apps

Expand
Name Type
appId String

3. Endpoint Prefix drive-changes

The following endpoints can be invoked with the prefix drive-changes as follows:
        google-drive://drive-changes/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
get changeId com.google.api.services.drive.model.Change
list com.google.api.services.drive.model.ChangeList
watch contentChannel com.google.api.services.drive.model.Channel

URI Options for drive-changes

Expand
Name Type
changeId String
contentChannel com.google.api.services.drive.model.Channel

4. Endpoint Prefix drive-channels

The following endpoints can be invoked with the prefix drive-channels as follows:
google-drive://drive-channels/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
stop contentChannel

URI Options for drive-channels

Expand
Name Type
contentChannel com.google.api.services.drive.model.Channel

5. Endpoint Prefix drive-children

The following endpoints can be invoked with the prefix drive-children as follows:
google-drive://drive-children/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
delete childId, folderId
get childId, folderId com.google.api.services.drive.model.ChildReference
insert content, folderId com.google.api.services.drive.model.ChildReference
list folderId com.google.api.services.drive.model.ChildList

URI Options for drive-children

Expand
Name Type
childId String
content com.google.api.services.drive.model.ChildReference
folderId String

6. Endpoint Prefix drive-comments

The following endpoints can be invoked with the prefix drive-comments as follows:
google-drive://drive-comments/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
delete commentId, fileId
get commentId, fileId com.google.api.services.drive.model.Comment
insert content, fileId com.google.api.services.drive.model.Comment
list fileId com.google.api.services.drive.model.CommentList
patch commentId, content, fileId com.google.api.services.drive.model.Comment
update commentId, content, fileId com.google.api.services.drive.model.Comment

URI Options for drive-comments

Expand
Name Type
commentId String
content com.google.api.services.drive.model.Comment
fileId String

7. Endpoint Prefix drive-files

The following endpoints can be invoked with the prefix drive-files as follows:
google-drive://drive-files/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
copy content, fileId com.google.api.services.drive.model.File
delete fileId
get fileId com.google.api.services.drive.model.File
insert [mediaContent], content com.google.api.services.drive.model.File
list com.google.api.services.drive.model.FileList
patch content, fileId com.google.api.services.drive.model.File
touch fileId com.google.api.services.drive.model.File
trash fileId com.google.api.services.drive.model.File
untrash fileId com.google.api.services.drive.model.File
update [mediaContent], content, fileId com.google.api.services.drive.model.File
watch contentChannel, fileId com.google.api.services.drive.model.Channel

URI Options for drive-files

Expand
Name Type
content com.google.api.services.drive.model.File
contentChannel com.google.api.services.drive.model.Channel
fileId String
mediaContent com.google.api.client.http.AbstractInputStreamContent

8. Endpoint Prefix drive-parents

The following endpoints can be invoked with the prefix drive-parents as follows:
google-drive://drive-parents/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
delete fileId, parentId
get fileId, parentId com.google.api.services.drive.model.ParentReference
insert content, fileId com.google.api.services.drive.model.ParentReference
list fileId com.google.api.services.drive.model.ParentList

URI Options for drive-parents

Expand
Name Type
content com.google.api.services.drive.model.ParentReference
fileId String
parentId String

9. Endpoint Prefix drive-permissions

The following endpoints can be invoked with the prefix drive-permissions as follows:
google-drive://drive-permissions/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
delete fileId, permissionId
get fileId, permissionId com.google.api.services.drive.model.Permission
getIdForEmail email com.google.api.services.drive.model.PermissionId
insert content, fileId com.google.api.services.drive.model.Permission
list fileId com.google.api.services.drive.model.PermissionList
patch content, fileId, permissionId com.google.api.services.drive.model.Permission
update content, fileId, permissionId com.google.api.services.drive.model.Permission

URI Options for drive-permissions

Expand
Name Type
content com.google.api.services.drive.model.Permission
email String
fileId String
permissionId String

10. Endpoint Prefix drive-properties

The following endpoints can be invoked with the prefix drive-properties as follows:
google-drive://drive-properties/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
delete fileId, propertyKey
get fileId, propertyKey com.google.api.services.drive.model.Property
insert content, fileId com.google.api.services.drive.model.Property
list fileId com.google.api.services.drive.model.PropertyList
patch content, fileId, propertyKey com.google.api.services.drive.model.Property
update content, fileId, propertyKey com.google.api.services.drive.model.Property

URI Options for drive-properties

Expand
Name Type
content com.google.api.services.drive.model.Property
fileId String
propertyKey String

11. Endpoint Prefix drive-realtime

The following endpoints can be invoked with the prefix drive-realtime as follows:
google-drive://drive-realtime/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
get fileId
update [mediaContent], fileId

URI Options for drive-realtime

Expand
Name Type
fileId String
mediaContent com.google.api.client.http.AbstractInputStreamContent

12. Endpoint Prefix drive-replies

The following endpoints can be invoked with the prefix drive-replies as follows:
google-drive://drive-replies/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
delete commentId, fileId, replyId
get commentId, fileId, replyId com.google.api.services.drive.model.CommentReply
insert commentId, content, fileId com.google.api.services.drive.model.CommentReply
list commentId, fileId com.google.api.services.drive.model.CommentReplyList
patch commentId, content, fileId, replyId com.google.api.services.drive.model.CommentReply
update commentId, content, fileId, replyId com.google.api.services.drive.model.CommentReply

URI Options for drive-replies

Expand
Name Type
commentId String
content com.google.api.services.drive.model.CommentReply
fileId String
replyId String

13. Endpoint Prefix drive-revisions

The following endpoints can be invoked with the prefix drive-revisions as follows:
google-drive://drive-revisions/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
delete fileId, revisionId
get fileId, revisionId com.google.api.services.drive.model.Revision
list fileId com.google.api.services.drive.model.RevisionList
patch content, fileId, revisionId com.google.api.services.drive.model.Revision
update content, fileId, revisionId com.google.api.services.drive.model.Revision

URI Options for drive-revisions

Expand
Name Type
content com.google.api.services.drive.model.Revision
fileId String
revisionId String

Consumer Endpoints

Any of the producer endpoints can be used as a consumer endpoint. Consumer endpoints can use Scheduled Poll Consumer Options with a consumer. prefix to schedule endpoint invocation. Consumer endpoints that return an array or collection will generate one exchange per element, and their routes will be executed once for each exchange.

Message Headers

Any URI option can be provided in a message header for producer endpoints with a CamelGoogleDrive. prefix.

Message Body

All result message bodies utilize objects provided by the underlying APIs used by the GoogleDriveComponent. Producer endpoints can specify the option name for incoming message body in the inBody endpoint URI parameter. For endpoints that return an array or collection, a consumer endpoint will map every element to distinct messages.

Chapter 53. GoogleMail

GoogleMail component

Available as of Camel 2.15

Component Description

The Google Mail component provides access to Gmail via the Google Mail Web APIs.
Google Mail uses the OAuth 2.0 protocol for authenticating a Google account and authorizing access to user data. Before you can use this component, you will need to create an account and generate OAuth credentials. Credentials comprise of a clientId, clientSecret, and a refreshToken. A handy resource for generating a long-lived refreshToken is the OAuth playground.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-google-mail</artifactId>
        <version>2.15-SNAPSHOT</version>
</dependency>
Copy to Clipboard Toggle word wrap

URI Format

The GoogleMail Component uses the following URI format:
google-mail://endpoint-prefix/endpoint?[options]
Copy to Clipboard Toggle word wrap
Endpoint prefix can be one of:
  • attachments
  • drafts
  • history
  • labels
  • messages
  • threads
  • users

GoogleMailComponent

The GoogleMail Component can be configured with the options below. These options can be provided using the component's bean property configuration of type org.apache.camel.component.google.mail.GoogleMailConfiguration.
Expand
Option Type
accessToken String OAuth 2 access token. This typically expires after an hour so refreshToken is recommended for long term usage.
applicationName String Google drive application name. Example would be "camel-google-mail/1.0"
clientId String Client ID of the drive application
clientSecret String Client secret of the drive application
refreshToken
String
OAuth 2 refresh token. Using this, the Google Mail component can obtain a new accessToken whenever the current one expires - a necessity if the application is long-lived.
scopes List<String> Specifies the level of permissions you want a drive application to have to a user account. See https://developers.google.com/gmail/api/auth/scopes for more info.

Producer Endpoints

Producer endpoints can use endpoint prefixes followed by endpoint names and associated options described next. A shorthand alias can be used for some endpoints. The endpoint URI MUST contain a prefix.
Endpoint options that are not mandatory are denoted by []. When there are no mandatory options for an endpoint, one of the set of [] options MUST be provided. Producer endpoints can also use a special option inBody that in turn should contain the name of the endpoint option whose value will be contained in the Camel Exchange In message.
Any of the endpoint options can be provided in either the endpoint URI, or dynamically in a message header. The message header name must be of the format CamelGoogleMail.<option>. Note that the inBody option overrides message header, i.e. the endpoint option inBody=option would override a CamelGoogleMail.option header.
For more information on the endpoints and options see API documentation at: https://developers.google.com/gmail/api/v1/reference/

1. Endpoint Prefix attachments

The following endpoints can be invoked with the prefix attachments as follows:
google-mail://attachments/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
get id, messageId, userId com.google.api.services.gmail.model.MessagePartBody

URI Options for attachments

Expand
Name Type
id String
messageId String
userId String

2. Endpoint Prefix drafts

The following endpoints can be invoked with the prefix drafts as follows:
google-mail://drafts/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
create [mediaContent], content, userId com.google.api.services.gmail.model.Draft
delete id, userId
get id, userId com.google.api.services.gmail.model.Draft
list userId com.google.api.services.gmail.model.ListDraftsResponse
send [mediaContent], content, userId com.google.api.services.gmail.model.Message
update [mediaContent], content, id, userId com.google.api.services.gmail.model.Draft

URI Options for drafts

Expand
Name Type
content com.google.api.services.gmail.model.Draft
id String
mediaContent com.google.api.client.http.AbstractInputStreamContent
userId String

3. Endpoint Prefix history

The following endpoints can be invoked with the prefix history as follows:
google-mail://history/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
list userId com.google.api.services.gmail.model.ListHistoryResponse

URI Options for history

Expand
Name Type
userId String

4. Endpoint Prefix labels

The following endpoints can be invoked with the prefix labels as follows:
google-mail://labels/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
create content, userId com.google.api.services.gmail.model.Label
delete id, userId
get id, userId com.google.api.services.gmail.model.Label
list userId com.google.api.services.gmail.model.ListLabelsResponse
patch content, id, userId com.google.api.services.gmail.model.Label
update content, id, userId com.google.api.services.gmail.model.Label

URI Options for labels

Expand
Name Type
content com.google.api.services.gmail.model.Label
id String
userId String

5. Endpoint Prefix messages

The following endpoints can be invoked with the prefix messages as follows:
google-mail://messages/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
delete id, userId
get id, userId com.google.api.services.gmail.model.Message
gmailImport [mediaContent], content, userId com.google.api.services.gmail.model.Message
insert [mediaContent], content, userId com.google.api.services.gmail.model.Message
list userId com.google.api.services.gmail.model.ListMessagesResponse
modify id, modifyMessageRequest, userId com.google.api.services.gmail.model.Message
send [mediaContent], content, userId com.google.api.services.gmail.model.Message
trash id, userId
untrash id, userId

URI Options for messages

Expand
Name Type
content com.google.api.services.gmail.model.Message
id String
mediaContent com.google.api.client.http.AbstractInputStreamContent
modifyMessageRequest com.google.api.services.gmail.model.ModifyMessageRequest
userId String

6. Endpoint Prefix threads

The following endpoints can be invoked with the prefix threads as follows:
google-mail://threads/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
delete id, userId
get id, userId com.google.api.services.gmail.model.Thread
list userId com.google.api.services.gmail.model.ListThreadsResponse
modify content, id, userId com.google.api.services.gmail.model.Thread
trash id, userId
untrash id, userId

URI Options for threads

Expand
Name Type
content com.google.api.services.gmail.model.ModifyThreadRequest
id String
userId String

7. Endpoint Prefix users

The following endpoints can be invoked with the prefix users as follows:
google-mail://users/endpoint?[options]
Copy to Clipboard Toggle word wrap
Expand
Endpoint Shorthand Alias Options Result Body Type
getProfile userId com.google.api.services.gmail.model.Profile

URI Options for users

Expand
Name Type
userId String

Consumer Endpoints

Any of the producer endpoints can be used as a consumer endpoint. Consumer endpoints can use Scheduled Poll Consumer Options with a consumer. prefix to schedule endpoint invocation. Consumer endpoints that return an array or collection will generate one exchange per element, and their routes will be executed once for each exchange.

Message Headers

Any URI option can be provided in a message header for producer endpoints with a CamelGoogleMail. prefix.

Message Body

All result message bodies utilize objects provided by the underlying APIs used by the GoogleMailComponent. Producer endpoints can specify the option name for incoming message body in the inBody endpoint URI parameter. For endpoints that return an array or collection, a consumer endpoint will map every element to distinct messages.

Chapter 54. Guava EventBus

Guava EventBus Component

Available since Camel 2.10.0
The Google Guava EventBus allows publish-subscribe-style communication between components without requiring the components to explicitly register with one another (and thus be aware of each other). The guava-eventbus: component provides integration bridge between Camel and Google Guava EventBus infrastructure. With the latter component, messages exchanged with the Guava EventBus can be transparently forwarded to the Camel routes. EventBus component allows also to route body of Camel exchanges to the Guava EventBus.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-guava-eventbus</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

guava-eventbus:busName[?options]
Copy to Clipboard Toggle word wrap
Where busName represents the name of the com.google.common.eventbus.EventBus instance located in the Camel registry.

Options

Expand
Name Default Value Description
eventClass null Camel 2.10: If used on the consumer side of the route, will filter events received from the EventBus to the instances of the class and superclasses of eventClass. Null value of this option is equal to setting it to the java.lang.Object i.e. the consumer will capture all messages incoming to the event bus. This option cannot be used together with listenerInterface option.
listenerInterface null Camel 2.11: The interface with method(s) marked with the @Subscribe annotation. Dynamic proxy will be created over the interface so it could be registered as the EventBus listener. Particularly useful when creating multi-event listeners and for handling DeadEvent properly. This option cannot be used together with eventClass option.

Usage

Using guava-eventbus component on the consumer side of the route will capture messages sent to the Guava EventBus and forward them to the Camel route. Guava EventBus consumer processes incoming messages asynchronously.
SimpleRegistry registry = new SimpleRegistry();
EventBus eventBus = new EventBus();
registry.put("busName", eventBus);
CamelContext camel = new DefaultCamelContext(registry);

from("guava-eventbus:busName").to("seda:queue");

eventBus.post("Send me to the SEDA queue.");
Copy to Clipboard Toggle word wrap
Using guava-eventbus component on the producer side of the route will forward body of the Camel exchanges to the Guava EventBus instance.
SimpleRegistry registry = new SimpleRegistry();
EventBus eventBus = new EventBus();
registry.put("busName", eventBus);
CamelContext camel = new DefaultCamelContext(registry);

from("direct:start").to("guava-eventbus:busName");

ProducerTemplate producerTemplate = camel.createProducerTemplate();
producer.sendBody("direct:start", "Send me to the Guava EventBus.");

eventBus.register(new Object(){
  @Subscribe
  public void messageHander(String message) {
    System.out.println("Message received from the Camel: " + message);
  }
});
Copy to Clipboard Toggle word wrap

DeadEvent considerations

Keep in mind that due to the limitations caused by the design of the Guava EventBus, you cannot specify event class to be received by the listener without creating class annotated with @Subscribe method. This limitation implies that endpoint with eventClass option specified actually listens to all possible events (java.lang.Object) and filter appropriate messages programmatically at runtime. The snipped below demonstrates an appropriate excerpt from the Camel code base.
@Subscribe
public void eventReceived(Object event) {
  if (eventClass == null || eventClass.isAssignableFrom(event.getClass())) {
    doEventReceived(event);
...
Copy to Clipboard Toggle word wrap
This drawback of this approach is that EventBus instance used by Camel will never generate com.google.common.eventbus.DeadEvent notifications. If you want Camel to listen only to the precisely specified event (and therefore enable DeadEvent support), use listenerInterface endpoint option. Camel will create dynamic proxy over the interface you specify with the latter option and listen only to messages specified by the interface handler methods. The example of the listener interface with single method handling only SpecificEvent instances is demonstrated below.
package com.example;

public interface CustomListener {

  @Subscribe
  void eventReceived(SpecificEvent event);

}
Copy to Clipboard Toggle word wrap
The listener presented above could be used in the endpoint definition as follows.
from("guava-eventbus:busName?listenerInterface=com.example.CustomListener").to("seda:queue");
Copy to Clipboard Toggle word wrap

Consuming multiple type of events

In order to define multiple type of events to be consumed by Guava EventBus consumer use listenerInterface endpoint option, as listener interface could provide multiple methods marked with the @Subscribe annotation.
package com.example;

public interface MultipleEventsListener {

  @Subscribe
  void someEventReceived(SomeEvent event);

  @Subscribe
  void anotherEventReceived(AnotherEvent event);

}
Copy to Clipboard Toggle word wrap
The listener presented above could be used in the endpoint definition as follows.
from("guava-eventbus:busName?listenerInterface=com.example.MultipleEventsListener").to("seda:queue");
Copy to Clipboard Toggle word wrap

Chapter 55. HawtDB

HawtDB

Available as of Apache Camel 2.3
HawtDB is a very lightweight and embeddable key value database. It allows together with Apache Camel to provide persistent support for various Apache Camel features such as section "Aggregator" in "Apache Camel Development Guide".
Deprecated
The HawtDB project is being deprecated and replaced by leveldb as the lightweight and embedable key value database. To make using leveldb easy there is a leveldbjni project for that. The Apache ActiveMQ project is planning on using leveldb as their primary file based message store in the future, to replace kahadb.
There os a camel-leveldb component we recommend to use instead of this.
Current features it provides:
  • HawtDBAggregationRepository

Using HawtDBAggregationRepository

HawtDBAggregationRepository is an AggregationRepository which on the fly persists the aggregated messages. This ensures that you will not loose messages, as the default aggregator will use an in memory only AggregationRepository.
It has the following options:
Expand
Option Type Description
repositoryName String A mandatory repository name. Allows you to use a shared HawtDBFile for multiple repositories.
persistentFileName String Filename for the persistent storage. If no file exists on startup a new file is created.
bufferSize int The size of the memory segment buffer which is mapped to the file store. By default its 8mb. The value is in bytes.
sync boolean Whether or not the HawtDBFile should sync on write or not. Default is true. By sync on write ensures that its always waiting for all writes to be spooled to disk and thus will not loose updates. If you disable this option, then HawtDB will auto sync when it has batched up a number of writes.
pageSize short The size of memory pages. By default its 512 bytes. The value is in bytes.
hawtDBFile HawtDBFile Use an existing configured org.apache.camel.component.hawtdb.HawtDBFile instance.
returnOldExchange boolean Whether the get operation should return the old existing Exchange if any existed. By default this option is false to optimize as we do not need the old exchange when aggregating.
useRecovery boolean Whether or not recovery is enabled. This option is by default true. When enabled the Apache Camel section "Aggregator" in "Apache Camel Development Guide" automatic recover failed aggregated exchange and have them resubmitted.
recoveryInterval long If recovery is enabled then a background task is run every x'th time to scan for failed exchanges to recover and resubmit. By default this interval is 5000 millis.
maximumRedeliveries int Allows you to limit the maximum number of redelivery attempts for a recovered exchange. If enabled then the Exchange will be moved to the dead letter channel if all redelivery attempts failed. By default this option is disabled. If this option is used then the deadLetterUri option must also be provided.
deadLetterUri String An endpoint uri for a Dead Letter Channel where exhausted recovered Exchanges will be moved. If this option is used then the maximumRedeliveries option must also be provided.
optimisticLocking false Camel 2.12: To turn on optimistic locking, which often would be needed in clustered environments where multiple Camel applications shared the same HawtDB based aggregation repository.
The repositoryName option must be provided. Then either the persistentFileName or the hawtDBFile must be provided.

What is preserved when persisting

HawtDBAggregationRepository will only preserve any Serializable compatible data types. If a data type is not such a type its dropped and a WARN is logged. And it only persists the Message body and the Message headers. The Exchange properties are not persisted.

Recovery

The HawtDBAggregationRepository will by default recover any failed Exchange. It does this by having a background tasks that scans for failed Exchanges in the persistent store. You can use the checkInterval option to set how often this task runs. The recovery works as transactional which ensures that Apache Camel will try to recover and redeliver the failed Exchange. Any Exchange which was found to be recovered will be restored from the persistent store and resubmitted and send out again.
The following headers is set when an Exchange is being recovered/redelivered:
Expand
Header Type Description
Exchange.REDELIVERED Boolean Is set to true to indicate the Exchange is being redelivered.
Exchange.REDELIVERY_COUNTER Integer The redelivery attempt, starting from 1.
Only when an Exchange has been successfully processed it will be marked as complete which happens when the confirm method is invoked on the AggregationRepository. This means if the same Exchange fails again it will be kept retried until it success.
You can use option maximumRedeliveries to limit the maximum number of redelivery attempts for a given recovered Exchange. You must also set the deadLetterUri option so Apache Camel knows where to send the Exchange when the maximumRedeliveries was hit.
You can see some examples in the unit tests of camel-hawtdb, for example this test.

Using HawtDBAggregationRepository in Java DSL

In this example we want to persist aggregated messages in the target/data/hawtdb.dat file.
public void configure() throws Exception {
    // create the hawtdb repo
    HawtDBAggregationRepository repo = new HawtDBAggregationRepository("repo1", "target/data/hawtdb.dat");

    // here is the Camel route where we aggregate
    from("direct:start")
        .aggregate(header("id"), new MyAggregationStrategy())
            // use our created hawtdb repo as aggregation repository
            .completionSize(5).aggregationRepository(repo)
            .to("mock:aggregated");
}
Copy to Clipboard Toggle word wrap

Using HawtDBAggregationRepository in Spring XML

The same example but using Spring XML instead:
<!-- a persistent aggregation repository using camel-hawtdb -->
<bean id="repo" class="org.apache.camel.component.hawtdb.HawtDBAggregationRepository">
    <!-- store the repo in the hawtdb.dat file -->
    <property name="persistentFileName" value="target/data/hawtdb.dat"/>
    <!-- and use repo2 as the repository name -->
    <property name="repositoryName" value="repo2"/>
</bean>

<!-- aggregate the messages using this strategy -->
<bean id="myAggregatorStrategy" class="org.apache.camel.component.hawtdb.HawtDBSpringAggregateTest$MyAggregationStrategy"/>

<!-- this is the camel routes -->
<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">

    <route>
        <from uri="direct:start"/>
        <!-- aggregate using our strategy and hawtdb repo, and complete when we have 5 messages aggregated -->
        <aggregate strategyRef="myAggregatorStrategy" aggregationRepositoryRef="repo" completionSize="5">
            <!-- correlate by header with the key id -->
            <correlationExpression><header>id</header></correlationExpression>
            <!-- send aggregated messages to the mock endpoint -->
            <to uri="mock:aggregated"/>
        </aggregate>
    </route>

</camelContext>
Copy to Clipboard Toggle word wrap

Dependencies

To use HawtDB in your Apache Camel routes you need to add the a dependency on camel-hawtdb.
If you use maven you could just add the following to your pom.xml, substituting the version number for the latest & greatest release (see the download page for the latest versions).
<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-hawtdb</artifactId>
  <version>2.3.0</version>
</dependency>
Copy to Clipboard Toggle word wrap
See Also:

Chapter 56. Hazelcast Component

Hazelcast Component

Available as of Apache Camel 2.7
The hazelcast: component allows you to work with the Hazelcast distributed data grid / cache. Hazelcast is a in memory data grid, entirely written in Java (single jar). It offers a great palette of different data stores like map, multi map (same key, n values), queue, list and atomic number. The main reason to use Hazelcast is its simple cluster support. If you have enabled multicast on your network you can run a cluster with hundred nodes with no extra configuration. Hazelcast can simply configured to add additional features like n copies between nodes (default is 1), cache persistence, network configuration (if needed), near cache, enviction and so on. For more information consult the Hazelcast documentation on http://www.hazelcast.com/docs.jsp.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-hazelcast</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

hazelcast:[ map | multimap | queue | topic | seda | set | atomicvalue | instance | list]:cachename[?options]
Copy to Clipboard Toggle word wrap

Options

Expand
Name
Required
Description
hazelcastInstance
No
Camel 2.14: The hazelcast instance reference which can be used for hazelcast endpoint. If you don't specify the instance reference, camel use the default hazelcast instance from the camel-hazelcast instance.
hazelcastInstanceName
No
defaultOperation
-1
Camel 2.15: To specify a default operation to use, if no operation header has been provided.
Warning
You have to use the second prefix to define which type of data store you want to use.

Sections

  1. Usage of map
  2. Usage of multimap
  3. Usage of queue
  4. Usage of topic
  5. Usage of list
  6. Usage of seda
  7. Usage of atomic number
  8. Usage of cluster support (instance)

Usage of Map

map cache producer - to("hazelcast:map:foo")

If you want to store a value in a map you can use the map cache producer. The map cache producer provides 5 operations (put, get, update, delete, query). For the first 4 you have to provide the operation inside the "hazelcast.operation.type" header variable. In Java DSL you can use the constants from org.apache.camel.component.hazelcast.HazelcastConstants.
Header Variables for the request message:
Expand
Name Type Description
hazelcast.operation.type String valid values are: put, delete, get, update, query
hazelcast.objectId String the object id to store / find your object inside the cache (not needed for the query operation)
Warning
Header variables have changed in Apache Camel 2.8
Expand
Name Type Description
CamelHazelcastOperationType String valid values are: put, delete, get, update, query Version 2.8
CamelHazelcastObjectId String the object id to store / find your object inside the cache (not needed for the query operation) Version 2.8
You can call the samples with:
template.sendBodyAndHeader("direct:[put|get|update|delete|query]", "my-foo", HazelcastConstants.OBJECT_ID, "4711");
Copy to Clipboard Toggle word wrap

Sample for put:

Java DSL:
from("direct:put")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.PUT_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:put" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>put</constant>
	</setHeader>
	<to uri="hazelcast:map:foo" />
</route>
Copy to Clipboard Toggle word wrap

Sample for get:

Java DSL:
from("direct:get")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.GET_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX)
.to("seda:out");
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:get" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>get</constant>
	</setHeader>
	<to uri="hazelcast:map:foo" />
	<to uri="seda:out" />
</route>
Copy to Clipboard Toggle word wrap

Sample for update:

Java DSL:
from("direct:update")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.UPDATE_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:update" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>update</constant>
	</setHeader>
	<to uri="hazelcast:map:foo" />
</route>
Copy to Clipboard Toggle word wrap

Sample for delete:

Java DSL:
from("direct:delete")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.DELETE_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:delete" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>delete</constant>
	</setHeader>
	<to uri="hazelcast:map:foo" />
</route>
Copy to Clipboard Toggle word wrap

Sample for query

Java DSL:
from("direct:query")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.QUERY_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX)
.to("seda:out");
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:query" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>query</constant>
	</setHeader>
	<to uri="hazelcast:map:foo" />
	<to uri="seda:out" />
</route>
Copy to Clipboard Toggle word wrap
For the query operation Hazelcast offers a SQL like syntax to query your distributed map.
String q1 = "bar > 1000";
template.sendBodyAndHeader("direct:query", null, HazelcastConstants.QUERY, q1);
Copy to Clipboard Toggle word wrap

map cache consumer - from("hazelcast:map:foo")

Hazelcast provides event listeners on their data grid. If you want to be notified if a cache will be manipulated, you can use the map consumer. There're 4 events: put, update, delete and envict. The event type will be stored in the "hazelcast.listener.action" header variable. The map consumer provides some additional information inside these variables:
Header Variables inside the response message:
Expand
Name Type Description
hazelcast.listener.time Long time of the event in millis
hazelcast.listener.type String the map consumer sets here "cachelistener"
hazelcast.listener.action String type of event - here added, updated, envicted and removed
hazelcast.objectId String the oid of the object
hazelcast.cache.name String the name of the cache - e.g. "foo"
hazelcast.cache.type String the type of the cache - here map
Warning
Header variables have changed in Apache Camel 2.8
Expand
Name Type Description
CamelHazelcastListenerTime Long time of the event in millis Version 2.8
CamelHazelcastListenerType String the map consumer sets here "cachelistener" Version 2.8
CamelHazelcastListenerAction String type of event - here added, updated, envicted and removed. Version 2.8
CamelHazelcastObjectId String the oid of the object Version 2.8
CamelHazelcastCacheName String the name of the cache - e.g. "foo" Version 2.8
CamelHazelcastCacheType String the type of the cache - here map Version 2.8
The object value will be stored within put and update actions inside the message body.
Here's a sample:
fromF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX)
.log("object...")
.choice()
    .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.ADDED))
         .log("...added")
         .to("mock:added")
    .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.ENVICTED))
         .log("...envicted")
         .to("mock:envicted")
    .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.UPDATED))
         .log("...updated")
         .to("mock:updated")
    .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.REMOVED))
         .log("...removed")
         .to("mock:removed")
    .otherwise()
         .log("fail!");
Copy to Clipboard Toggle word wrap

Usage of Multi Map

A multimap is a cache where you can store n values to one key. The multimap producer provides 4 operations (put, get, removevalue, delete).
Header Variables for the request message:
Expand
Name Type Description
hazelcast.operation.type String valid values are: put, get, removevalue, delete
hazelcast.objectId String the object id to store / find your object inside the cache
Warning
Header variables have changed in Apache Camel 2.8
Header Variables for the request message in Apache Camel 2.8:
Expand
Name Type Description
CamelHazelcastOperationType String valid values are: put, delete, get, update, query Available as of Apache Camel 2.8
CamelHazelcastObjectId String the object id to store / find your object inside the cache (not needed for the query operation) Version 2.8
You can call the samples with:
template.sendBodyAndHeader("direct:[put|get|update|delete|query]", "my-foo", HazelcastConstants.OBJECT_ID, "4711");
Copy to Clipboard Toggle word wrap

Sample for put:

Java DSL:
from("direct:put")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.PUT_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:put" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>put</constant>
	</setHeader>
	<to uri="hazelcast:map:foo" />
</route>
Copy to Clipboard Toggle word wrap

Sample for get:

Java DSL:
from("direct:get")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.GET_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX)
.to("seda:out");
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:get" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>get</constant>
	</setHeader>
	<to uri="hazelcast:map:foo" />
	<to uri="seda:out" />
</route>
Copy to Clipboard Toggle word wrap

Sample for update:

Java DSL:
from("direct:update")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.UPDATE_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:update" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>update</constant>
	</setHeader>
	<to uri="hazelcast:map:foo" />
</route>
Copy to Clipboard Toggle word wrap

Sample for delete:

Java DSL:
from("direct:delete")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.DELETE_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:delete" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>delete</constant>
	</setHeader>
	<to uri="hazelcast:map:foo" />
</route>
Copy to Clipboard Toggle word wrap

Sample for query

Java DSL:
from("direct:query")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.QUERY_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX)
.to("seda:out");
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:query" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>query</constant>
	</setHeader>
	<to uri="hazelcast:map:foo" />
	<to uri="seda:out" />
</route>
Copy to Clipboard Toggle word wrap
For the query operation Hazelcast offers a SQL like syntax to query your distributed map.
String q1 = "bar > 1000";
template.sendBodyAndHeader("direct:query", null, HazelcastConstants.QUERY, q1);
Copy to Clipboard Toggle word wrap

map cache consumer - from("hazelcast:map:foo")

Hazelcast provides event listeners on their data grid. If you want to be notified if a cache will be manipulated, you can use the map consumer. There're 4 events: put, update, delete and envict. The event type will be stored in the "hazelcast.listener.action" header variable. The map consumer provides some additional information inside these variables:
Header Variables inside the response message:
Expand
Name Type Description
hazelcast.listener.time Long time of the event in millis
hazelcast.listener.type String the map consumer sets here "cachelistener"
hazelcast.listener.action String type of event - here added, updated, envicted and removed
hazelcast.objectId String the oid of the object
hazelcast.cache.name String the name of the cache - e.g. "foo"
hazelcast.cache.type String the type of the cache - here map
Warning
Header variables have changed in Apache Camel 2.8
Expand
Name Type Description
CamelHazelcastListenerTime Long time of the event in millis Version 2.8
CamelHazelcastListenerType String the map consumer sets here "cachelistener" Version 2.8
CamelHazelcastListenerAction String type of event - here added, updated, envicted and removed. Version 2.8
CamelHazelcastObjectId String the oid of the object Version 2.8
CamelHazelcastCacheName String the name of the cache - e.g. "foo" Version 2.8
CamelHazelcastCacheType String the type of the cache - here map Version 2.8
The object value will be stored within put and update actions inside the message body.
Here's a sample:
fromF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX)
.log("object...")
.choice()
    .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.ADDED))
         .log("...added")
         .to("mock:added")
    .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.ENVICTED))
         .log("...envicted")
         .to("mock:envicted")
    .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.UPDATED))
         .log("...updated")
         .to("mock:updated")
    .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.REMOVED))
         .log("...removed")
         .to("mock:removed")
    .otherwise()
         .log("fail!");
Copy to Clipboard Toggle word wrap

Usage of Multi Map

A multimap is a cache where you can store n values to one key. The multimap producer provides 4 operations (put, get, removevalue, delete).
Header Variables for the request message:
Expand
Name Type Description
hazelcast.operation.type String valid values are: put, get, removevalue, delete
hazelcast.objectId String the object id to store / find your object inside the cache
Warning
Header variables have changed in Apache Camel 2.8
Expand
Name Type Description
CamelHazelcastOperationType String valid values are: put, get, removevalue, delete Version 2.8
CamelHazelcastObjectId String the object id to store / find your object inside the cache Version 2.8

Sample for put:

Java DSL:
from("direct:put")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.PUT_OPERATION))
.to(String.format("hazelcast:%sbar", HazelcastConstants.MULTIMAP_PREFIX));
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:put" />
	<log message="put.."/>
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>put</constant>
	</setHeader>
	<to uri="hazelcast:multimap:foo" />
</route>
Copy to Clipboard Toggle word wrap

Sample for removevalue:

Java DSL:
from("direct:removevalue")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.REMOVEVALUE_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.MULTIMAP_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:removevalue" />
	<log message="removevalue..."/>
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>removevalue</constant>
	</setHeader>
	<to uri="hazelcast:multimap:foo" />
</route>
Copy to Clipboard Toggle word wrap
To remove a value you have to provide the value you want to remove inside the message body. If you have a multimap object } you have to put "my-foo" inside the message body to remove the "my-foo" value.

Sample for get:

Java DSL:
from("direct:get")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.GET_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.MULTIMAP_PREFIX)
.to("seda:out");
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:get" />
	<log message="get.."/>
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>get</constant>
	</setHeader>
	<to uri="hazelcast:multimap:foo" />
	<to uri="seda:out" />
</route>
Copy to Clipboard Toggle word wrap

Sample for delete:

Java DSL:
from("direct:delete")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.DELETE_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.MULTIMAP_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:delete" />
	<log message="delete.."/>
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>delete</constant>
	</setHeader>
	<to uri="hazelcast:multimap:foo" />
</route>
Copy to Clipboard Toggle word wrap
you can call them in your test class with:
template.sendBodyAndHeader("direct:[put|get|removevalue|delete]", "my-foo", HazelcastConstants.OBJECT_ID, "4711");
Copy to Clipboard Toggle word wrap
For the multimap cache this component provides the same listeners / variables as for the map cache consumer (except the update and enviction listener). The only difference is the multimap prefix inside the URI. Here is a sample:
fromF("hazelcast:%sbar", HazelcastConstants.MULTIMAP_PREFIX)
.log("object...")
.choice()
	.when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.ADDED))
		.log("...added")
                .to("mock:added")
        //.when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.ENVICTED))
        //        .log("...envicted")
        //        .to("mock:envicted")
        .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.REMOVED))
                .log("...removed")
                .to("mock:removed")
        .otherwise()
                .log("fail!");
Copy to Clipboard Toggle word wrap
Header Variables inside the response message:
Expand
Name Type Description
hazelcast.listener.time Long time of the event in millis
hazelcast.listener.type String the map consumer sets here "cachelistener"
hazelcast.listener.action String type of event - here added and removed (and soon envicted)
hazelcast.objectId String the oid of the object
hazelcast.cache.name String the name of the cache - e.g. "foo"
hazelcast.cache.type String the type of the cache - here multimap
Eviction will be added as feature, soon (this is a Hazelcast issue).
Warning
Header variables have changed in Apache Camel 2.8
Expand
Name Type Description
CamelHazelcastListenerTime Long time of the event in millis Version 2.8
CamelHazelcastListenerType String the map consumer sets here "cachelistener" Version 2.8
CamelHazelcastListenerAction String type of event - here added and removed (and soon envicted) Version 2.8
CamelHazelcastObjectId String the oid of the object Version 2.8
CamelHazelcastCacheName String the name of the cache - e.g. "foo" Version 2.8
CamelHazelcastCacheType String the type of the cache - here multimap Version 2.8

Usage of Queue

Queue producer to("hazelcast:queue:foo")

The queue producer provides 6 operations (add, put, poll, peek, offer, removevalue).

Sample for add:

from("direct:add")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.ADD_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);
Copy to Clipboard Toggle word wrap

Sample for put:

from("direct:put")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.PUT_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);
Copy to Clipboard Toggle word wrap

Sample for poll:

from("direct:poll")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.POLL_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);
Copy to Clipboard Toggle word wrap

Sample for peek:

from("direct:peek")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.PEEK_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);
Copy to Clipboard Toggle word wrap

Sample for offer:

from("direct:offer")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.OFFER_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);
Copy to Clipboard Toggle word wrap

Sample for removevalue:

from("direct:removevalue")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.REMOVEVALUE_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);
Copy to Clipboard Toggle word wrap

Queue consumer from("hazelcast:queue:foo")

The queue consumer provides 2 operations (add, remove).
fromF("hazelcast:%smm", HazelcastConstants.QUEUE_PREFIX)
   .log("object...")
   .choice()
	.when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.ADDED))
        	.log("...added")
		.to("mock:added")
	.when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.REMOVED))
		.log("...removed")
		.to("mock:removed")
	.otherwise()
		.log("fail!");
Copy to Clipboard Toggle word wrap

Usage of Topic

Topic producer – to(“hazelcast:topic:foo”)

The topic producer provides only one operation (publish).

Sample for publish

from("direct:add")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.PUBLISH_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.PUBLISH_OPERATION);
Copy to Clipboard Toggle word wrap

Topic consumer – from(“hazelcast:topic:foo”)

The topic consumer provides only one operation (received). This component is supposed to support multiple consumption as it's expected when it comes to topics so you are free to have as much consumers as you need on the same hazelcast topic.
fromF("hazelcast:%sfoo", HazelcastConstants.TOPIC_PREFIX)
  .choice()
    .when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.RECEIVED))
      .log("...message received")
    .otherwise()
      .log("...this should never have happened")
Copy to Clipboard Toggle word wrap

Usage of List

List producer to("hazelcast:list:foo")

The list producer provides 4 operations (add, set, get, removevalue).

Sample for add:

from("direct:add")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.ADD_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.LIST_PREFIX);
Copy to Clipboard Toggle word wrap

Sample for get:

from("direct:get")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.GET_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.LIST_PREFIX)
.to("seda:out");
Copy to Clipboard Toggle word wrap

Sample for setvalue:

from("direct:set")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.SETVALUE_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.LIST_PREFIX);
Copy to Clipboard Toggle word wrap

Sample for removevalue:

from("direct:removevalue")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.REMOVEVALUE_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.LIST_PREFIX);
Copy to Clipboard Toggle word wrap
Warning
Please note that set,get and removevalue and not yet supported by hazelcast, will be added in the future..

List consumer from("hazelcast:list:foo")

The list consumer provides 2 operations (add, remove).
fromF("hazelcast:%smm", HazelcastConstants.LIST_PREFIX)
	.log("object...")
	.choice()
		.when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.ADDED))
			.log("...added")
                        .to("mock:added")
		.when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.REMOVED))
			.log("...removed")
                        .to("mock:removed")
                .otherwise()
                        .log("fail!");
Copy to Clipboard Toggle word wrap

Usage of SEDA

SEDA component differs from the rest components provided. It implements a work-queue in order to support asynchronous SEDA architectures, similar to the core "SEDA" component.

SEDA producer to("hazelcast:seda:foo")

The SEDA producer provides no operations. You only send data to the specified queue.
Expand
Name default value Description
transferExchange false Apache Camel 2.8.0: if set to true the whole Exchange will be transfered. If header or body contains not serializable objects, they will be skipped.
Java DSL :
from("direct:foo")
.to("hazelcast:seda:foo");
Copy to Clipboard Toggle word wrap
Spring DSL :
<route>
   <from uri="direct:start" />
   <to uri="hazelcast:seda:foo" />
</route>
Copy to Clipboard Toggle word wrap

SEDA consumer from("hazelcast:seda:foo")

The SEDA consumer provides no operations. You only retrieve data from the specified queue.
Expand
Name default value Description
pollInterval 1000 Deprecated since Camel 2.15. Use pollTimeout instead.
pollTimeout 1000 The timeout used when consuming from the SEDA queue. When a timeout occurs, the consumer can check whether it is allowed to continue running. Setting a lower value allows the consumer to react more quickly upon shutdown.
concurrentConsumers 1 To use concurrent consumers polling from the SEDA queue.
transferExchange false Camel 2.8.0: if set to true the whole Exchange will be transfered. If header or body contains not serializable objects, they will be skipped.
transacted false Camel 2.10.4: if set to true then the consumer runs in transaction mode, where the messages in the seda queue will only be removed if the transaction commits, which happens when the processing is complete.
Java DSL :
from("hazelcast:seda:foo")
.to("mock:result");
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
  <from uri="hazelcast:seda:foo" />
  <to uri="mock:result" />
</route>
Copy to Clipboard Toggle word wrap

Usage of Atomic Number

Warning
There is no consumer for this endpoint\!
An atomic number is an object that simply provides a grid wide number (long). The operations for this producer are setvalue (set the number with a given value), get, increase (+1), decrease (-1) and destroy.
Header Variables for the request message:
Expand
Name Type Description
hazelcast.operation.type String valid values are: setvalue, get, increase, decrease, destroy
Warning
Header variables have changed in Apache Camel 2.8
Expand
Name Type Description
CamelHazelcastOperationType String valid values are: setvalue, get, increase, decrease, destroy Available as of Apache Camel version 2.8

Sample for set:

Java DSL:
from("direct:set")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.SETVALUE_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.ATOMICNUMBER_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:set" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>setvalue</constant>
	</setHeader>
	<to uri="hazelcast:atomicvalue:foo" />
</route>
Copy to Clipboard Toggle word wrap
Provide the value to set inside the message body (here the value is 10): template.sendBody("direct:set", 10);

Sample for get:

Java DSL:
from("direct:get")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.GET_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.ATOMICNUMBER_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:get" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>get</constant>
	</setHeader>
	<to uri="hazelcast:atomicvalue:foo" />
</route>
Copy to Clipboard Toggle word wrap
You can get the number with long body = template.requestBody("direct:get", null, Long.class);.

Sample for increment:

Java DSL:
from("direct:increment")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.INCREMENT_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.ATOMICNUMBER_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:increment" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>increment</constant>
	</setHeader>
	<to uri="hazelcast:atomicvalue:foo" />
</route>
Copy to Clipboard Toggle word wrap
The actual value (after increment) will be provided inside the message body.

Sample for decrement:

Java DSL:
from("direct:decrement")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.DECREMENT_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.ATOMICNUMBER_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:decrement" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>decrement</constant>
	</setHeader>
	<to uri="hazelcast:atomicvalue:foo" />
</route>
Copy to Clipboard Toggle word wrap
The actual value (after decrement) will be provided inside the message body.

Sample for destroy

Warning
There's a bug inside Hazelcast. So this feature may not work properly. Will be fixed in 1.9.3.
Java DSL:
from("direct:destroy")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.DESTROY_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.ATOMICNUMBER_PREFIX);
Copy to Clipboard Toggle word wrap
Spring DSL:
<route>
	<from uri="direct:destroy" />
        <!-- If using version 2.8 and above set headerName to "CamelHazelcastOperationType" -->
	<setHeader headerName="hazelcast.operation.type">
		<constant>destroy</constant>
	</setHeader>
	<to uri="hazelcast:atomicvalue:foo" />
</route>
Copy to Clipboard Toggle word wrap

Cluster support

Warning
This endpoint provides no producer!

instance consumer - from("hazelcast:instance:foo")

Hazelcast makes sense in one single "server node", but it's extremly powerful in a clustered environment. The instance consumer fires if a new cache instance will join or leave the cluster.
Here's a sample:
fromF("hazelcast:%sfoo", HazelcastConstants.INSTANCE_PREFIX)
.log("instance...")
.choice()
	.when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.ADDED))
		.log("...added")
		.to("mock:added")
	.otherwise()
		.log("...removed")
		.to("mock:removed");
Copy to Clipboard Toggle word wrap
Each event provides the following information inside the message header:
Header Variables inside the response message:
Expand
Name Type Description
hazelcast.listener.time Long time of the event in millis
hazelcast.listener.type String the map consumer sets here "instancelistener"
hazelcast.listener.action String type of event - here added or removed
hazelcast.instance.host String host name of the instance
hazelcast.instance.port Integer port number of the instance
Warning
Header variables have changed in Apache Camel 2.8
Expand
Name Type Description
CamelHazelcastListenerTime Long time of the event in millis Version 2.8
CamelHazelcastListenerType String the map consumer sets here "instancelistener" Version 2.8
CamelHazelcastListenerActionn String type of event - here added or removed. Version 2.8
CamelHazelcastInstanceHost String host name of the instance Version 2.8
CamelHazelcastInstancePort Integer port number of the instance Version 2.8

Using hazelcast reference

By its name

<bean id="hazelcastLifecycle" class="com.hazelcast.core.LifecycleService"
      factory-bean="hazelcastInstance" factory-method="getLifecycleService"
      destroy-method="shutdown" />

<bean id="config" class="com.hazelcast.config.Config">
    <constructor-arg type="java.lang.String" value="HZ.INSTANCE" />
</bean>

<bean id="hazelcastInstance" class="com.hazelcast.core.Hazelcast" factory-method="newHazelcastInstance">
    <constructor-arg type="com.hazelcast.config.Config" ref="config"/>
</bean>
<camelContext xmlns="http://camel.apache.org/schema/spring">
    <route id="testHazelcastInstanceBeanRefPut">
        <from uri="direct:testHazelcastInstanceBeanRefPut"/>
        <setHeader headerName="CamelHazelcastOperationType">
            <constant>put</constant>
        </setHeader>
        <to uri="hazelcast:map:testmap?hazelcastInstanceName=HZ.INSTANCE"/>
    </route>

    <route id="testHazelcastInstanceBeanRefGet">
        <from uri="direct:testHazelcastInstanceBeanRefGet" />
        <setHeader headerName="CamelHazelcastOperationType">
            <constant>get</constant>
        </setHeader>
        <to uri="hazelcast:map:testmap?hazelcastInstanceName=HZ.INSTANCE"/>
        <to uri="seda:out" />
    </route>
</camelContext>
Copy to Clipboard Toggle word wrap

By instance

<bean id="hazelcastInstance" class="com.hazelcast.core.Hazelcast"
      factory-method="newHazelcastInstance" />
<bean id="hazelcastLifecycle" class="com.hazelcast.core.LifecycleService"
      factory-bean="hazelcastInstance" factory-method="getLifecycleService"
      destroy-method="shutdown" />

<camelContext xmlns="http://camel.apache.org/schema/spring">
    <route id="testHazelcastInstanceBeanRefPut">
        <from uri="direct:testHazelcastInstanceBeanRefPut"/>
        <setHeader headerName="CamelHazelcastOperationType">
            <constant>put</constant>
        </setHeader>
        <to uri="hazelcast:map:testmap?hazelcastInstance=#hazelcastInstance"/>
    </route>

    <route id="testHazelcastInstanceBeanRefGet">
        <from uri="direct:testHazelcastInstanceBeanRefGet" />
        <setHeader headerName="CamelHazelcastOperationType">
            <constant>get</constant>
        </setHeader>
        <to uri="hazelcast:map:testmap?hazelcastInstance=#hazelcastInstance"/>
        <to uri="seda:out" />
    </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Publishing hazelcast instance as an OSGI service

If operating in an OSGI container and you would want to use one instance of hazelcast across all bundles in the same container. You can publish the instance as an OSGI service and bundles using the cache al need is to reference the service in the hazelcast endpoint.
<bean id="config" class="com.hazelcast.config.FileSystemXmlConfig">
    <argument type="java.lang.String" value="${hazelcast.config}"/>
</bean>

<bean id="hazelcastInstance" class="com.hazelcast.core.Hazelcast" factory-method="newHazelcastInstance">
    <argument type="com.hazelcast.config.Config" ref="config"/>
</bean>

<!-- publishing the hazelcastInstance as a service -->
<service ref="hazelcastInstance" interface="com.hazelcast.core.HazelcastInstance" />
Copy to Clipboard Toggle word wrap

Bundle B uses the instance

<!-- referencing the hazelcastInstance as a service -->
<reference ref="hazelcastInstance" interface="com.hazelcast.core.HazelcastInstance" />

<camelContext xmlns="http://camel.apache.org/schema/blueprint">
    <route id="testHazelcastInstanceBeanRefPut">
        <from uri="direct:testHazelcastInstanceBeanRefPut"/>
        <setHeader headerName="CamelHazelcastOperationType">
            <constant>put</constant>
        </setHeader>
        <to uri="hazelcast:map:testmap?hazelcastInstance=#hazelcastInstance"/>
    </route>

    <route id="testHazelcastInstanceBeanRefGet">
        <from uri="direct:testHazelcastInstanceBeanRefGet" />
        <setHeader headerName="CamelHazelcastOperationType">
            <constant>get</constant>
        </setHeader>
        <to uri="hazelcast:map:testmap?hazelcastInstance=#hazelcastInstance"/>
        <to uri="seda:out" />
    </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Chapter 57. HBase

HBase Component

Available as of Camel 2.10
This component provides an idemptotent repository, producers and consumers for Apache HBase.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-hbase</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

Apache HBase Overview

HBase is an open-source, distributed, versioned, column-oriented store modeled after Google's Bigtable: A Distributed Storage System for Structured Data. You can use HBase when you need random, realtime read/write access to your Big Data. More information at Apache HBase.

Camel and HBase

When using a datasotre inside a camel route, there is always the chalenge of specifying how the camel message will stored to the datastore. In document based stores things are more easy as the message body can be directly mapped to a document. In relational databases an ORM solution can be used to map properties to columns etc. In column based stores things are more challenging as there is no standard way to perform that kind of mapping.
HBase adds two additional challenges:
  • HBase groups columns into families, so just mapping a property to a column using a name convention is just not enough.
  • HBase doesn't have the notion of type, which means that it stores everything as byte[] and doesn't know if the byte[] represents a String, a Number, a serialized Java object or just binary data.
To overcome these challenges, camel-hbase makes use of the message headers to specify the mapping of the message to HBase columns. It also provides the ability to use some camel-hbase provided classes that model HBase data and can be easily convert to and from xml/json etc. Finally it provides the ability to the user to implement and use his own mapping strategy.
Regardless of the mapping strategy camel-hbase will convert a message into an org.apache.camel.component.hbase.model.HBaseData object and use that object for its internal operations.

Configuring the component

The HBase component can be provided a custom HBaseConfiguration object as a property or it can create an HBase configuration object on its own based on the HBase related resources that are found on classpath.
    <bean id="hbase" class="org.apache.camel.component.hbase.HBaseComponent">
        <property name="configuration" ref="config"/>
    </bean>
Copy to Clipboard Toggle word wrap
If no configuration object is provided to the component, the component will create one. The created configuration will search the class path for an hbase-site.xml file, from which it will draw the configuration. You can find more information about how to configure HBase clients at: HBase client configuration and dependencies

HBase Producer

As mentioned above camel provides produers endpoints for HBase. This allows you to store, delete, retrieve or query data from HBase using your camel routes.
hbase://table[?options]
Copy to Clipboard Toggle word wrap
where table is the table name.
The supported operations are:
  • Put
  • Get
  • Delete
  • Scan

Supported URI options on producer

Expand
Name Default Value Description
operation CamelHBasePut The HBase operation to perform. Supported values: CamelHBasePut, CamelHBaseGet, CamelHBaseDelete, and CamelHBaseScan.
maxResults 100 The maximum number of rows to scan.Supported operations: CamelHBaseScan.
mappingStrategyName header The strategy to use for mapping Camel messages to HBase columns. Supported values: header, or body.
mappingStrategyClassName null The class name of a custom mapping strategy implementation.
filters null A list of filters. Supported operations: CamelHBaseScan.
Header mapping options:
Expand
Name Default Value Description
rowId The id of the row. This has limited use as the row usually changes per Exchange.
rowType String The type to covert row id to. Supported operations: CamelHBaseScan.
family The column family. Supports a number suffix for referring to more than one columns
qualifier The column qualifier. Supports a number suffix for referring to more than one columns
value The value. Supports a number suffix for referring to more than one columns
valueType String The value type. Supports a number suffix for referring to more than one columns. Supported operations: CamelHBaseGet, and CamelHBaseScan.

Put Operations.

HBase is a column based store, which allows you to store data into a specific column of a specific row. Columns are grouped into families, so in order to specify a column you need to specify the column family and the qualifier of that column. To store data into a specific column you need to specify both the column and the row.
The simplest scenario for storing data into HBase from a camel route, would be to store part of the message body to specified HBase column.
        <route>
            <from uri="direct:in"/>
            <!-- Set the HBase Row -->
            <setHeader headerName="CamelHBaseRowId">
                <el>${in.body.id}</el>
            </setHeader>
            <!-- Set the HBase Value -->
            <setHeader headerName="CamelHBaseValue">
                <el>${in.body.value}</el>
            </setHeader>
            <to uri="hbase:mytable?operation=CamelHBasePut&amily=myfamily&ualifier=myqualifier"/>
        </route>
Copy to Clipboard Toggle word wrap
The route above assumes that the message body contains an object that has an id and value property and will store the content of value in the HBase column myfamily:myqualifier in the row specified by id. If we needed to specify more than one column/value pairs we could just specify additional column mappings. Notice that you must use numbers from the second header onwards, for example RowId2, RowId3, RowId4, and so on. Only the first header does not have the number 1.
        <route>
            <from uri="direct:in"/>
            <!-- Set the HBase Row 1st column -->
            <setHeader headerName="CamelHBaseRowId">
                <el>${in.body.id}</el>
            </setHeader>
            <!-- Set the HBase Row 2nd column -->
            <setHeader headerName="CamelHBaseRowId2">
                <el>${in.body.id}</el>
            </setHeader>
            <!-- Set the HBase Value for 1st column -->
            <setHeader headerName="CamelHBaseValue">
                <el>${in.body.value}</el>
            </setHeader>
            <!-- Set the HBase Value for 2nd column -->
            <setHeader headerName="CamelHBaseValue2">
                <el>${in.body.othervalue}</el>
            </setHeader>
            <to uri="hbase:mytable?operation=CamelHBasePut&amily=myfamily&ualifier=myqualifier&amily2=myfamily&ualifier2=myqualifier2"/>
        </route>
Copy to Clipboard Toggle word wrap
It is important to remember that you can use uri options, message headers or a combination of both. It is recommended to specify constants as part of the uri and dynamic values as headers. If something is defined both as header and as part of the uri, the header will be used.

Get Operations.

A Get Operation is an operation that is used to retrieve one or more values from a specified HBase row. To specify what are the values that you want to retrieve you can just specify them as part of the uri or as message headers.
        <route>
            <from uri="direct:in"/>
            <!-- Set the HBase Row of the Get -->
            <setHeader headerName="CamelHBaseRowId">
                <el>${in.body.id}</el>
            </setHeader>
            <to uri="hbase:mytable?operation=CamelHBaseGet&amily=myfamily&ualifier=myqualifier&alueType=java.lang.Long"/>
            <to uri="log:out"/>
        </route>
Copy to Clipboard Toggle word wrap
In the example above the result of the get operation will be stored as a header with name CamelHBaseValue.

Delete Operations.

You can also you camel-hbase to perform HBase delete operation. The delete operation will remove an entire row. All that needs to be specified is one or more rows as part of the message headers.
        <route>
            <from uri="direct:in"/>
            <!-- Set the HBase Row of the Get -->
            <setHeader headerName="CamelHBaseRowId">
                <el>${in.body.id}</el>
            </setHeader>
            <to uri="hbase:mytable?operation=CamelHBaseDelete"/>
        </route>
Copy to Clipboard Toggle word wrap

Scan Operations.

A scan operation is the equivalent of a query in HBase. You can use the scan operation to retrieve multiple rows. To specify what columns should be part of the result and also specify how the values will be converted to objects you can use either uri options or headers.
        <route>
            <from uri="direct:in"/>
            <to uri="hbase:mytable?operation=CamelHBaseScan&amily=myfamily&ualifier=myqualifier&alueType=java.lang.Long&owType=java.lang.String"/>
            <to uri="log:out"/>
        </route>
Copy to Clipboard Toggle word wrap
In this case its probable that you also also need to specify a list of filters for limiting the results. You can specify a list of filters as part of the uri and camel will return only the rows that satisfy ALL the filters. To have a filter that will be aware of the information that is part of the message, camel defines the ModelAwareFilter. This will allow your filter to take into consideration the model that is defined by the message and the mapping strategy. When using a ModelAwareFilter camel-hbase will apply the selected mapping strategy to the in message, will create an object that models the mapping and will pass that object to the Filter.
For example to perform scan using as criteria the message headers, you can make use of the ModelAwareColumnMatchingFilter as shown below.
        <route>
            <from uri="direct:scan"/>
            <!-- Set the Criteria -->
            <setHeader headerName="CamelHBaseFamily">
                <constant>name</constant>
            </setHeader>
            <setHeader headerName="CamelHBaseQualifier">
                <constant>first</constant>
            </setHeader>
            <setHeader headerName="CamelHBaseValue">
                <el>in.body.firstName</el>
            </setHeader>
            <setHeader headerName="CamelHBaseFamily2">
                <constant>name</constant>
            </setHeader>
            <setHeader headerName="CamelHBaseQualifier2">
                <constant>last</constant>
            </setHeader>
            <setHeader headerName="CamelHBaseValue2">
                <el>in.body.lastName</el>
            </setHeader>
            <!-- Set additional fields that you want to be return by skipping value -->
            <setHeader headerName="CamelHBaseFamily3">
                <constant>address</constant>
            </setHeader>
            <setHeader headerName="CamelHBaseQualifier3">
                <constant>country</constant>
            </setHeader>
            <to uri="hbase:mytable?operation=CamelHBaseScan&ilters=#myFilterList"/>
        </route>

        <bean id="myFilters" class="java.util.ArrayList">
            <constructor-arg>
                <list>
                    <bean class="org.apache.camel.component.hbase.filters.ModelAwareColumnMatchingFilter"/>
                </list>
            </constructor-arg>
        </bean>
Copy to Clipboard Toggle word wrap
The route above assumes that a pojo is with properties firstName and lastName is passed as the message body, it takes those properties and adds them as part of the message headers. The default mapping strategy will create a model object that will map the headers to HBase columns and will pass that model the the ModelAwareColumnMatchingFilter. The filter will filter out any rows, that do not contain columns that match the model. It is like query by example.

HBase Consumer

The Camel HBase Consumer, will perform repeated scan on the specified HBase table and will return the scan results as part of the message. You can either specify header mapping (default) or body mapping. The later will just add the org.apache.camel.component.hbase.model.HBaseData as part of the message body.
hbase://table[?options]
Copy to Clipboard Toggle word wrap
You can specify the columns that you want to be return and their types as part of the uri options:
hbase:mutable?family=name&qualifer=first&valueType=java.lang.String&family=address&qualifer=number&valueType2=java.lang.Integer&rowType=java.lang.Long
Copy to Clipboard Toggle word wrap
The example above will create a model object that is consisted of the specified fields and the scan results will populate the model object with values. Finally the mapping strategy will be used to map this model to the camel message.

Supported URI options on consumer

Expand
Name Default Value Description
initialDelay 1000 Milliseconds before the first polling starts.
delay 500 Milliseconds before the next poll.
useFixedDelay true Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details.
timeUnit TimeUnit.MILLISECONDS time unit for initialDelay and delay options.
runLoggingLevel TRACE Camel 2.8: The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that.
operation CamelHBasePut The HBase operation to perform. Supported values: CamelHBasePut, CamelHBaseGet, CamelHBaseDelete, and CamelHBaseScan.
maxResults 100 The maximum number of rows to scan. Supported operations:CamelHBaseScan.
mappingStrategyName header The strategy to use for mapping Camel messages to HBase columns. Supported values: header, or body.
mappingStrategyClassName null The class name of a custom mapping strategy implementation.
filters null A list of filters. Supported operations: CamelHBaseScan
Header mapping options:
Expand
Name Default Value Description
rowId The id of the row. This has limited use as the row usually changes per Exchange.
rowType String The type to covert row id to. Supported operations: CamelHBaseScan
family The column family. *upports a number suffix for referring to more than one columns
qualifier The column qualifier. *Supports a number suffix for referring to more than one columns
value The value. Supports a number suffix for referring to more than one columns
rowModel String An instance of org.apache.camel.component.hbase.model.HBaseRow which describes how each row should be modeled
If the role of the rowModel is not clear, it allows you to construct the HBaseRow modle programmatically instead of "describing" it with uri options (such as family, qualifier, type etc).

HBase Idempotent repository

The camel-hbase component also provides an idempotent repository which can be used when you want to make sure that each message is processed only once. The HBase idempotent repository is configured with a table, a column family and a column qualifier and will create to that table a row per message.
HBaseConfiguration configuration = HBaseConfiguration.create();
HBaseIdempotentRepository repository = new HBaseIdempotentRepository(configuration, tableName, family, qualifier);

from("direct:in")
  .idempotentConsumer(header("messageId"), repository)
  .to("log:out);
Copy to Clipboard Toggle word wrap

HBase Mapping

It was mentioned above that you the default mapping strategies are header and body mapping. Below you can find some detailed examples of how each mapping strategy works.

HBase Header mapping Examples

The header mapping is the default mapping. To put the value "myvalue" into HBase row "myrow" and column "myfamily:mycolum" the message should contain the following headers:
Expand
Header Value
CamelHBaseRowId myrow
CamelHBaseFamily myfamily
CamelHBaseQualifier myqualifier
CamelHBaseValue myvalue
To put more values for different columns and / or different rows you can specify additional headers suffixed with the index of the headers, e.g:
Expand
Header Value
CamelHBaseRowId myrow
CamelHBaseFamily myfamily
CamelHBaseQualifier myqualifier
CamelHBaseValue myvalue
CamelHBaseRowId2 myrow2
CamelHBaseFamily2 myfamily
CamelHBaseQualifier2 myqualifier
CamelHBaseValue2 myvalue2
In the case of retrieval operations such as get or scan you can also specify for each column the type that you want the data to be converted to. For exampe:
Expand
Header Value
CamelHBaseFamily myfamily
CamelHBaseQualifier myqualifier
CamelHBaseValueType Long
Please note that in order to avoid boilerplate headers that are considered constant for all messages, you can also specify them as part of the endpoint uri, as you will see below.

Body mapping Examples

In order to use the body mapping strategy you will have to specify the option mappingStrategy as part of the uri, for example:
hbase:mytable?mappingStrategy=body
Copy to Clipboard Toggle word wrap
To use the body mapping strategy the body needs to contain an instance of org.apache.camel.component.hbase.model.HBaseData. You can construct t
HBaseData data = new HBaseData();
HBaseRow row = new HBaseRow();
row.setId("myRowId");
HBaseCell cell = new HBaseCell();
cell.setFamily("myfamily");
cell.setQualifier("myqualifier");
cell.setValue("myValue");
row.getCells().add(cell);
data.addRows().add(row);
Copy to Clipboard Toggle word wrap
The object above can be used for example in a put operation and will result in creating or updating the row with id myRowId and add the value myvalue to the column myfamily:myqualifier. The body mapping strategy might not seem very appealing at first. The advantage it has over the header mapping strategy is that the HBaseData object can be easily converted to or from xml/json.

See also

Chapter 58. HDFS

HDFS Component

Available as of Camel 2.8
The hdfs component enables you to read and write messages from/to an HDFS file system. HDFS is the distributed file system at the heart of Hadoop.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-hdfs</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

hdfs://hostname[:port][/path][?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?option=value&option=value&... The path is treated in the following way:
  1. as a consumer, if it's a file, it just reads the file, otherwise if it represents a directory it scans all the file under the path satisfying the configured pattern. All the files under that directory must be of the same type.
  2. as a producer, if at least one split strategy is defined, the path is considered a directory and under that directory the producer creates a different file per split named using the configured UuidGenerator.
Note
When consuming from HDFS in normal mode, a file is split into chunks, producing a message per chunk. You can configure the size of the chunk using the chunkSize option. If you want to read from HDFS and write to a regular file using the File component, you can set fileMode=Append to concatenate the chunks.

Options

Expand
Name Default Value Description
overwrite true The file can be overwritten
append false Append to existing file. Notice that not all HDFS file systems support the append option.
bufferSize 4096 The buffer size used by HDFS
replication 3 The HDFS replication factor
blockSize 67108864 The size of the HDFS blocks
fileType NORMAL_FILE
It can be SEQUENCE_FILE, MAP_FILE, ARRAY_FILE, or BLOOMMAP_FILE, see Hadoop
fileSystemType HDFS It can be LOCAL for local filesystem
keyType NULL
The type for the key in case of sequence or map files. See below.
valueType TEXT
The type for the key in case of sequence or map files. See below.
splitStrategy
A string describing the strategy on how to split the file based on different criteria. See below.
openedSuffix opened
When a file is opened for reading/ writing the file is renamed with this suffix to avoid to read it during the writing phase.
readSuffix read
Once the file has been read is renamed with this suffix to avoid to read it again.
initialDelay 0
For the consumer, how much to wait (milliseconds) before to start scanning the directory.
delay 0
The interval (milliseconds) between the directory scans.
pattern *
The pattern used for scanning the directory
chunkSize 4096
When reading a normal file, this is split into chunks producing a message per chunk
connectOnStartup true Camel 2.9.3/2.10.1: Whether to connect to the HDFS file system on starting the producer/consumer. If false then the connection is created on-demand. Notice that HDFS may take up till 15 minutes to establish a connection, as it has hardcoded 45 x 20 sec redelivery. By setting this option to false allows your application to startup, and not block for up till 15 minutes.
owner
Camel 2.13/2.12.4: The file owner must match this owner for the consumer to pickup the file. Otherwise the file is skipped.

KeyType and ValueType

  • NULL it means that the key or the value is absent
  • BYTE for writing a byte, the java Byte class is mapped into a BYTE
  • BYTES for writing a sequence of bytes. It maps the java ByteBuffer class
  • INT for writing java integer
  • FLOAT for writing java float
  • LONG for writing java long
  • DOUBLE for writing java double
  • TEXT for writing java strings
BYTES is also used with everything else, for example, in Camel a file is sent around as an InputStream, int this case is written in a sequence file or a map file as a sequence of bytes.

Splitting Strategy

In the current version of Hadoop opening a file in append mode is disabled, since it's not reliable enough. So, for the moment, it's only possible to create new files. The Camel HDFS endpoint tries to solve this problem in this way:
  • If the split strategy option has been defined, the hdfs path will be used as a directory and files will be created using the configured UuidGenerator.
  • Every time a splitting condition is met, a new file is created. The splitStrategy option is defined as a string with the following syntax: splitStrategy=<ST>:<value>,<ST>:<value>,*
Where <ST> can be:
  • BYTES a new file is created, and the old is closed when the number of written bytes is more than <value>
  • MESSAGES a new file is created, and the old is closed when the number of written messages is more than <value>
  • IDLE a new file is created, and the old is closed when no writing happened in the last <value> milliseconds
Note
This strategy currently requires either setting an IDLE value or setting the HdfsConstants.HDFS_CLOSE header to false to use the BYTES/MESSAGES configuration, otherwise the file will be closed with each message
For example:
hdfs://localhost/tmp/simple-file?splitStrategy=IDLE:1000,BYTES:5
Copy to Clipboard Toggle word wrap
it means: a new file is created either when it has been idle for more than 1 second or if more than 5 bytes have been written. So, running hadoop fs ls /tmp/simplefile you'll see that multiple files have been created.

Message Headers

The following headers are supported by this component:
Producer only
Expand
Header
Description
CamelFileName
Camel 2.13: Specifies the name of the file to write (relative to the endpoint path). The name can be a String or an Expression object. Only relevant when not using a split strategy.

Controlling to close file stream

Available as of Camel 2.10.4
When using the HDFS producer without a split strategy, the file output stream is by default closed after the write. However you may want to keep the stream open, and only explicitly close the stream later. For that you can use the header HdfsConstants.HDFS_CLOSE (value = "CamelHdfsClose") to control this. Setting this value to a boolean allows you to explicit control whether the stream should be closed or not.
Notice this does not apply if you use a split strategy, as there are various strategies that can control when the stream is closed.

Using this component in OSGi

This component is fully functional in an OSGi environment however, it requires some actions from the user. Hadoop uses the thread context class loader in order to load resources. Usually, the thread context classloader will be the bundle class loader of the bundle that contains the routes. So, the default configuration files need to be visible from the bundle class loader. A typical way to deal with it is to keep a copy of core-default.xml in your bundle root. That file can be found in the hadoop-common.jar.

Chapter 59. HDFS2

HDFS2 Component

Available as of Camel 2.13
The hdfs2 component enables you to read and write messages from/to an HDFS file system using Hadoop 2.x. HDFS is the distributed file system at the heart of Hadoop.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-hdfs2</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

hdfs2://hostname[:port][/path][?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?option=value&option=value&... The path is treated in the following way:
  1. as a consumer, if it's a file, it just reads the file, otherwise if it represents a directory it scans all the file under the path satisfying the configured pattern. All the files under that directory must be of the same type.
  2. as a producer, if at least one split strategy is defined, the path is considered a directory and under that directory the producer creates a different file per split named using the configured UuidGenerator.
Note
When consuming from HDFS in normal mode, a file is split into chunks, producing a message per chunk. You can configure the size of the chunk using the chunkSize option. If you want to read from HDFS and write to a regular file using the File component, you can set fileMode=Append to concatenate the chunks.

Options

Expand
Name
Default Value
Description
overwrite
true
The file can be overwritten
append
false
Append to existing file. Notice that not all HDFS file systems support the append option.
bufferSize
4096
The buffer size used by HDFS
replication
3
The HDFS replication factor
blockSize
67108864
The size of the HDFS blocks
fileType
NORMAL_FILE
It can be SEQUENCE_FILE, MAP_FILE, ARRAY_FILE, or BLOOMMAP_FILE, see Hadoop
fileSystemType
HDFS
It can be LOCAL for local filesystem
keyType
NULL
The type for the key in case of sequence or map files. See below.
valueType
TEXT
The type for the key in case of sequence or map files. See below.
splitStrategy
A string describing the strategy on how to split the file based on different criteria. See below.
openedSuffix
opened
When a file is opened for reading/writing the file is renamed with this suffix to avoid to read it during the writing phase.
readSuffix
read
Once the file has been read is renamed with this suffix to avoid to read it again.
initialDelay
0
For the consumer, how much to wait (milliseconds) before to start scanning the directory.
delay
0
The interval (milliseconds) between the directory scans.
pattern
*
The pattern used for scanning the directory
chunkSize
4096
When reading a normal file, this is split into chunks producing a message per chunk.
connectOnStartup
true
Camel 2.9.3/2.10.1: Whether to connect to the HDFS file system on starting the producer/consumer. If false then the connection is created on-demand. Notice that HDFS may take up till 15 minutes to establish a connection, as it has hardcoded 45 x 20 sec redelivery. By setting this option to false allows your application to startup, and not block for up till 15 minutes.
owner
The file owner must match this owner for the consumer to pickup the file. Otherwise the file is skipped.

KeyType and ValueType

  • NULL it means that the key or the value is absent
  • BYTE for writing a byte, the java Byte class is mapped into a BYTE
  • BYTES for writing a sequence of bytes. It maps the java ByteBuffer class
  • INT for writing java integer
  • FLOAT for writing java float
  • LONG for writing java long
  • DOUBLE for writing java double
  • TEXT for writing java strings
BYTES is also used with everything else, for example, in Camel a file is sent around as an InputStream, int this case is written in a sequence file or a map file as a sequence of bytes.

Splitting Strategy

In the current version of Hadoop opening a file in append mode is disabled since it's not very reliable. So, for the moment, it's only possible to create new files. The Camel HDFS endpoint tries to solve this problem in this way:
  • If the split strategy option has been defined, the hdfs path will be used as a directory and files will be created using the configured UuidGenerator
  • Every time a splitting condition is met, a new file is created. The splitStrategy option is defined as a string with the following syntax: splitStrategy=<ST>:<value>,<ST>:<value>,*
where <ST> can be:
  • BYTES a new file is created, and the old is closed when the number of written bytes is more than <value>
  • MESSAGES a new file is created, and the old is closed when the number of written messages is more than <value>
  • IDLE a new file is created, and the old is closed when no writing happened in the last <value> milliseconds
Note
note that this strategy currently requires either setting an IDLE value or setting the HdfsConstants.HDFS_CLOSE header to false to use the BYTES/MESSAGES configuration...otherwise, the file will be closed with each message
for example:
hdfs2://localhost/tmp/simple-file?splitStrategy=IDLE:1000,BYTES:5
Copy to Clipboard Toggle word wrap
it means: a new file is created either when it has been idle for more than 1 second or if more than 5 bytes have been written. So, running hadoop fs -ls /tmp/simple-file you'll see that multiple files have been created.

Message Headers

The following headers are supported by this component:

Producer only

Expand
Header
Description
CamelFileName
Camel 2.13: Specifies the name of the file to write (relative to the endpoint path). The name can be a String or an Expression object. Only relevant when not using a split strategy.

Controlling to close file stream

When using the HDFS2 producer without a split strategy, then the file output stream is by default closed after the write. However you may want to keep the stream open, and only explicitly close the stream later. For that you can use the header HdfsConstants.HDFS_CLOSE (value = "CamelHdfsClose") to control this. Setting this value to a boolean allows you to explicit control whether the stream should be closed or not.
Notice this does not apply if you use a split strategy, as there are various strategies that can control when the stream is closed.

Using this component in OSGi

There are some quirks when running this component in an OSGi environment related to the mechanism Hadoop 2.x uses to discover different org.apache.hadoop.fs.FileSystem implementations. Hadoop 2.x uses java.util.ServiceLoader which looks for /META-INF/services/org.apache.hadoop.fs.FileSystem files defining available filesystem types and implementations. These resources are not available when running inside OSGi.
As with camel-hdfs component, the default configuration files need to be visible from the bundle class loader. A typical way to deal with it is to keep a copy of core-default.xml (and e.g., hdfs-default.xml) in your bundle root.

Using this component with manually defined routes

There are two options:
  1. Package /META-INF/services/org.apache.hadoop.fs.FileSystem resource with bundle that defines the routes. This resource should list all the required Hadoop 2.x filesystem implementations.
  2. Provide boilerplate initialization code which populates internal, static cache inside org.apache.hadoop.fs.FileSystem class:
org.apache.hadoop.conf.Configuration conf = new org.apache.hadoop.conf.Configuration();
conf.setClass("fs.file.impl", org.apache.hadoop.fs.LocalFileSystem.class, FileSystem.class);
conf.setClass("fs.hdfs.impl", org.apache.hadoop.hdfs.DistributedFileSystem.class, FileSystem.class);
...
FileSystem.get("file:///", conf);
FileSystem.get("hdfs://localhost:9000/", conf);
...
Copy to Clipboard Toggle word wrap

Using this component with Blueprint container

Two options:
  1. Package /META-INF/services/org.apache.hadoop.fs.FileSystem resource with bundle that contains blueprint definition.
  2. Add the following to the blueprint definition file:
<bean id="hdfsOsgiHelper" class="org.apache.camel.component.hdfs2.HdfsOsgiHelper">
   <argument>
      <map>
         <entry key="file:///" value="org.apache.hadoop.fs.LocalFileSystem"  />
         <entry key="hdfs://localhost:9000/" value="org.apache.hadoop.hdfs.DistributedFileSystem" />
         ...
      </map>
   </argument>
</bean>

<bean id="hdfs2" class="org.apache.camel.component.hdfs2.HdfsComponent" depends-on="hdfsOsgiHelper" />
Copy to Clipboard Toggle word wrap
This way Hadoop 2.x will have correct mapping of URI schemes to filesystem implementations.

Chapter 60. Hipchat

Hipchat component

Available as of Camel 2.15.0
The Hipchat component supports producing and consuming messages from/to Hipchat service.
Expand
You must have a valid Hipchat user account and get a personal access token that you can use to produce/consume messages.

URI Format

hipchat://[host][:port]?options
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options

Expand
Name
Default Value
Context
Required Producer/Consumer
Description
authToken
null
Shared
Yes Both Authorization token(personal access token) obtained from Hipchat
protocol
http
Shared
No Both
Default protocol to connect to the Hipchat server
consumeUsers
null
Shared
No Consumer
Comma separated list of user @Mentions or emails whose messages to the owner of authToken must be consumed
host api.hipchat.com Shared No Both The API host of the Hipchat to connect to
port 80 Shared No Both The port to connect to on the Hipchat host
delay 5000 Shared No Consumer The poll interval in millisec for consuming messages from consumeUsers provided. Please read about rate limits before decreasing this.

Scheduled Poll Consumer

This component implements the ScheduledPollConsumer. Only the last message from the provided 'consumeUsers' are retrieved and sent as Exchange body. If you do not want the same message to be retrieved again when there are no new messages on next poll then you can add the idempotent consumer as shown below. All the options on the ScheduledPollConsumer can also be used for more control on the consumer.
@Override
public void configure() throws Exception {
 String hipchatEndpointUri = "hipchat://?authToken=XXXX&consumeUsers=@Joe,@John";
 from(hipchatEndpointUri)
  .idempotentConsumer(
    simple("${in.header.HipchatMessageDate} ${in.header.HipchatFromUser}"),
    MemoryIdempotentRepository.memoryIdempotentRepository(200)
  )
  .to("mock:result");
}
Copy to Clipboard Toggle word wrap

Message headers set by the Hipchat consumer

Expand
Expand
Header
Constant
Type
Description
HipchatFromUser HipchatConstants.FROM_USER String The body has the message that was sent from this user to the owner of authToken
HipchatMessageDate HipchatConstants.MESSAGE_DATE String The date message was sent. The format is ISO-8601 as present in the Hipchat response.
HipchatFromUserResponseStatus HipchatConstants.FROM_USER_RESPONSE_STATUS StatusLine The status of the API response received.

Hipchat Producer

Producer can send messages to both Room's and User's simultaneously. The body of the exchange is sent as message. Sample usage is shown below. Appropriate headers needs to be set.
@Override
 public void configure() throws Exception {
  String hipchatEndpointUri = "hipchat://?authToken=XXXX";
  from("direct:start")
   .to(hipchatEndpointUri)
   .to("mock:result");
 }
Copy to Clipboard Toggle word wrap

Message headers evaluated by the Hipchat producer

Expand
Expand
Header
Constant
Type
Description
HipchatToUser HipchatConstants.TO_USER String The Hipchat user to which the message needs to be sent.
HipchatToRoom HipchatConstants.TO_ROOM String The Hipchat room to which the message needs to be sent.
HipchatMessageFormat HipchatConstants.MESSAGE_FORMAT String Valid formats are 'text' or 'html'. Default: 'text'
HipchatMessageBackgroundColor HipchatConstants.MESSAGE_BACKGROUND_COLOR String Valid color values are 'yellow', 'green', 'red', 'purple', 'gray', 'random'. Default: 'yellow' (Room Only)
HipchatTriggerNotification HipchatConstants.TRIGGER_NOTIFY String Valid values are 'true' or 'false'. Whether this message should trigger a user notification (change the tab color, play a sound, notify mobile phones, etc). Default: 'false' (Room Only)

Message headers set by the Hipchat producer

Expand
Expand
Header
Constant
Type
Description
HipchatToUserResponseStatus HipchatConstants.TO_USER_RESPONSE_STATUS StatusLine The status of the API response received when message sent to the user.
HipchatFromUserResponseStatus HipchatConstants.TO_ROOM_RESPONSE_STATUS StatusLine The status of the API response received when message sent to the room.

Dependencies

Maven users will need to add the following dependency to their pom.xml.
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-hipchat</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap
where ${camel-version} must be replaced by the actual version of Camel (2.15.0 or higher)

Chapter 61. HL7

HL7 Component

The HL7 component is used for working with the HL7 MLLP protocol and HL7 v2 messages using the HAPI library.
This component supports the following:
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-hl7</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

HL7 MLLP protocol

HL7 is often used with the HL7 MLLP protocol, which is a text based TCP socket based protocol. This component ships with a Mina and Netty4 Codec that conforms to the MLLP protocol so you can easily expose an HL7 listener accepting HL7 requests over the TCP transport layer.
To expose a HL7 listener service, the camel-mina2 or camel-netty4 component is used with the HL7MLLPCodec (mina2) or HL7MLLPNettyDecoder/HL7MLLPNettyEncoder (Netty4).
The HL7 MLLP codec has the following options:
Expand
Name Default Value Description
startByte 0x0b The start byte spanning the HL7 payload.
endByte1 0x1c The first end byte spanning the HL7 payload.
endByte2 0x0d The 2nd end byte spanning the HL7 payload.
charset JVM Default The encoding (a charset name) to use for the codec. If not provided, Camel will use the JVM default Charset.
produceString true Camel 2.14.1: If true, the codec creates a string using the defined charset. If false, the codec sends a plain byte array into the route, so that the HL7 Data Format can determine the actual charset from the HL7 message content.
convertLFtoCR false Will convert \n to \r (0x0d, 13 decimal) as HL7 stipulates \r as segment terminators. The HAPI library requires the use of \r.

Exposing a HL7 listener using Mina

In the Spring XML file, we configure a Mina2 endpoint to listen for HL7 requests using TCP on port 8888:
<endpoint id="hl7MinaListener" uri="mina2:tcp://localhost:8888?sync=true&amp;codec=#hl7codec"/>
Copy to Clipboard Toggle word wrap
sync=true indicates that this listener is synchronous and therefore will return a HL7 response to the caller. The HL7 codec is set up with codec=#hl7codec. Note that hl7codec is just a Spring bean ID, so it could be named mygreatcodecforhl7 or whatever you like. The codec is also set up in the Spring XML file:
    <bean id="hl7codec" class="org.apache.camel.component.hl7.HL7MLLPCodec">
        <property name="charset" value="iso-8859-1"/>
    </bean>
Copy to Clipboard Toggle word wrap
The endpoint hl7MinaListener can then be used in a route as a consumer, as this Java DSL example illustrates:
    from("hl7MinaListener").beanRef("patientLookupService");
Copy to Clipboard Toggle word wrap
This is a very simple route that will listen for HL7 and route it to a service named patientLookupService. This is also Spring bean ID, configured in the Spring XML as:
    <bean id="patientLookupService" class="com.mycompany.healthcare.service.PatientLookupService"/>
Copy to Clipboard Toggle word wrap
Another powerful feature of Camel is that we can have our business logic in POJO classes that is not tied to Camel as shown here:
import ca.uhn.hl7v2.HL7Exception;
import ca.uhn.hl7v2.model.Message;
import ca.uhn.hl7v2.model.v24.segment.QRD;

public class PatientLookupService {
    public Message lookupPatient(Message input) throws HL7Exception {
        QRD qrd = (QRD)input.get("QRD");
        String patientId = qrd.getWhoSubjectFilter(0).getIDNumber().getValue();

        // find patient data based on the patient id and create a HL7 model object with the response
        Message response = ... create and set response data
        return response
    }
Copy to Clipboard Toggle word wrap
Notice that this class uses just imports from the HAPI library and not from Camel.
In the Spring XML file, we configure a Netty4 endpoint to listen for HL7 requests using TCP on port 8888:
<endpoint id="hl7NettyListener" uri="netty4:tcp://localhost:8888?sync=true&amp;encoder=#hl7encoder&amp;decoder=#hl7decoder"/>
Copy to Clipboard Toggle word wrap
sync=true indicates that this listener is synchronous and therefore will return a HL7 response to the caller. The HL7 codec is set up with encoder=#hl7encoder and decoder=#hl7decoder. Note that hl7encoder and hl7decoder are just bean IDs, so they could be named differently. The beans can be set in the Spring XML file:
<bean id="hl7decoder" class="org.apache.camel.component.hl7.HL7MLLPNettyDecoderFactory"/>
<bean id="hl7encoder" class="org.apache.camel.component.hl7.HL7MLLPNettyEncoderFactory"/>
Copy to Clipboard Toggle word wrap
The hl7NettyListener endpoint can then be used in a route as a consumer, as this Java DSL example illustrates:
from("hl7NettyListener").beanRef("patientLookupService");
Copy to Clipboard Toggle word wrap

HL7 Model using java.lang.String or byte[]

The HL7 MLLP codec uses plain String as its data format. Camel uses its Type Converter to convert to/from strings to the HAPI HL7 model objects, but you can use the plain String objects if you prefer, for instance if you wish to parse the data yourself.
As of Camel 2.14.1 you can also let both the Mina and Netty codecs use a plain byte[] as its data format by setting the produceString property to false. The Type Converter is also capable of converting the byte[] to/from HAPI HL7 model objects.

HL7v2 Model using HAPI

The HL7v2 model uses Java objects from the HAPI library. Using this library, you can encode and decode from the EDI format (ER7) that is mostly used with HL7v2.
The sample below is a request to lookup a patient with the patient ID 0101701234.
MSH|^~\\&|MYSENDER|MYRECEIVER|MYAPPLICATION||200612211200||QRY^A19|1234|P|2.4
QRD|200612211200|R|I|GetPatient|||1^RD|0101701234|DEM||
Copy to Clipboard Toggle word wrap
Using the HL7 model, you can work with a ca.uhn.hl7v2.model.Message object, for example to retrieve a patient ID:
Message msg = exchange.getIn().getBody(Message.class);
QRD qrd = (QRD)msg.get("QRD");
String patientId = qrd.getWhoSubjectFilter(0).getIDNumber().getValue();  // 0101701234
Copy to Clipboard Toggle word wrap
This is powerful when combined with the HL7 listener, because you don't have to work with byte[], String or any other simple object formats. You can just use the HAPI HL7v2 model objects. If you know the message type in advance, you can be more type-safe:
QRY_A19 msg = exchange.getIn().getBody(QRY_A19.class);
String patientId = msg.getQRD().getWhoSubjectFilter(0).getIDNumber().getValue();
Copy to Clipboard Toggle word wrap

HL7 DataFormat

The HL7 component ships with a HL7 data format that can be used to marshal or unmarshal HL7 model objects.
  • marshal = from Message to byte stream (can be used when responding using the HL7 MLLP codec)
  • unmarshal = from byte stream to Message (can be used when receiving streamed data from the HL7 MLLP
To use the data format, simply instantiate an instance and invoke the marshal or unmarshal operation in the route builder:
DataFormat hl7 = new HL7DataFormat();
...
from("direct:hl7in").marshal(hl7).to("jms:queue:hl7out");
Copy to Clipboard Toggle word wrap
In the sample above, the HL7 is marshalled from a HAPI Message object to a byte stream and put on a JMS queue. The next example is the opposite:
DataFormat hl7 = new HL7DataFormat();
...
from("jms:queue:hl7out").unmarshal(hl7).to("patientLookupService");
Copy to Clipboard Toggle word wrap
Here we unmarshal the byte stream into a HAPI Message object that is passed to our patient lookup service.
Note
As of HAPI 2.0 (used by Camel 2.11), the HL7v2 model classes are fully serializable. So you can put HL7v2 messages directly into a JMS queue (i.e. without calling marshal() and read them again directly from the queue (i.e. without calling unmarshal()).
Important
As of Camel 2.11, unmarshal does not automatically fix segment separators any more by converting \n to \r. If you need this conversion, org.apache.camel.component.hl7.HL7#convertLFToCR provides a handy Expression for this purpose.
Important
As of Camel 2.14.1, both marshal and unmarshal evaluate the charset provided in the field MSH-18. If this field is empty, by default the charset contained in the corresponding Camel charset property/header is assumed. You can even change this default behaviour by overriding the guessCharsetName method when inheriting from the HL7DataFormat class.
There is a shorthand syntax in Camel for well-known data formats that are commonly used. Then you don't need to create an instance of the HL7DataFormat object:
from("direct:hl7in").marshal().hl7().to("jms:queue:hl7out");
from("jms:queue:hl7out").unmarshal().hl7().to("patientLookupService");
Copy to Clipboard Toggle word wrap

Message Headers

The unmarshal operation adds these fields from the MSH segment as headers on the Camel message:
Expand
Key MSH field Example
CamelHL7SendingApplication MSH-3 MYSERVER
CamelHL7SendingFacility MSH-4 MYSERVERAPP
CamelHL7ReceivingApplication MSH-5 MYCLIENT
CamelHL7ReceivingFacility MSH-6 MYCLIENTAPP
CamelHL7Timestamp MSH-7 20071231235900
CamelHL7Security MSH-8 null
CamelHL7MessageType MSH-9-1 ADT
CamelHL7TriggerEvent MSH-9-2 A01
CamelHL7MessageControl MSH-10 1234
CamelHL7ProcessingId MSH-11 P
CamelHL7VersionId MSH-12 2.4
CamelHL7Context -
Camel 2.14: contains the HapiContext that was used to parse the message
CamelHL7Charset MSH-18
Camel 2.14.1: Unicode UTF-8
All headers except CamelHL7Context are String types. If a header value is missing, its value is null.

Options

The HL7 Data Format supports the following options:
Expand
Option Default Description
validate true Whether the HAPI Parser should validate the message using the default validation rules. It is recommended to use the parser or hapiContext option and initialize it with the desired HAPI ValidationContext.
parser ca.uhn.hl7v2.parser.GenericParser Custom parser to be used. Must be of type ca.uhn.hl7v2.parser.Parser. Note that GenericParser also allows to parse XML-encoded HL7v2 messages
hapiContext ca.uhn.hl7v2.DefaultHapiContext
Camel 2.14: Custom HAPI context that can define a custom parser, custom ValidationContext etc. This gives you full control over the HL7 parsing and rendering process.

Dependencies

To use HL7 in your Camel routes you'll need to add a dependency on camel-hl7 listed above, which implements this data format.
The HAPI library is been split into a base library and several structure libraries, one for each HL7v2 message version:
By default camel-hl7 only references the HAPI base library. Applications are responsible for including structure libraries themselves. For example, if an application works with HL7v2 message versions 2.4 and 2.5 then the following dependencies must be added:
<dependency>
    <groupId>ca.uhn.hapi</groupId>
    <artifactId>hapi-structures-v24</artifactId>
    <version>2.2</version>
    <!-- use the same version as your hapi-base version -->
</dependency>
<dependency>
    <groupId>ca.uhn.hapi</groupId>
    <artifactId>hapi-structures-v25</artifactId>
    <version>2.2</version>
    <!-- use the same version as your hapi-base version -->
</dependency>
Copy to Clipboard Toggle word wrap
Alternatively, an OSGi bundle containing the base library, all structures libraries and required dependencies (on the bundle classpath) can be downloaded from the central Maven repository.
<dependency>
    <groupId>ca.uhn.hapi</groupId>
    <artifactId>hapi-osgi-base</artifactId>
    <version>2.2</version>
</dependency>
Copy to Clipboard Toggle word wrap

Terser language

HAPI provides a Terser class that provides access to fields using a commonly used terse location specification syntax. The Terser language allows to use this syntax to extract values from messages and to use them as expressions and predicates for filtering, content-based routing etc.
Sample:
import static org.apache.camel.component.hl7.HL7.terser;
...

   // extract patient ID from field QRD-8 in the QRY_A19 message above and put into message header
   from("direct:test1")
      .setHeader("PATIENT_ID",terser("QRD-8(0)-1"))
      .to("mock:test1");
   // continue processing if extracted field equals a message header
   from("direct:test2")
      .filter(terser("QRD-8(0)-1").isEqualTo(header("PATIENT_ID"))
      .to("mock:test2");
Copy to Clipboard Toggle word wrap

HL7 Validation predicate

Often it is preferable first to parse a HL7v2 message and in a separate step validate it against a HAPI ValidationContext.
Sample:
import static org.apache.camel.component.hl7.HL7.messageConformsTo;
import ca.uhn.hl7v2.validation.impl.DefaultValidation;
...

  // Use standard or define your own validation rules
   ValidationContext defaultContext = new DefaultValidation(); 

   // Throws PredicateValidationException if message does not validate
   from("direct:test1").validate(messageConformsTo(defaultContext)).to("mock:test1");
Copy to Clipboard Toggle word wrap
The HAPI Context is always configured with a ValidationContext (or a ValidationRuleBuilder), so you can access the validation rules indirectly. Furthermore, when unmarshalling the HL7DataFormat forwards the configured HAPI context in the CamelHL7Context header, and the validation rules of this context can be easily reused:
import static org.apache.camel.component.hl7.HL7.messageConformsTo;
import static org.apache.camel.component.hl7.HL7.messageConforms
...

  HapiContext hapiContext = new DefaultHapiContext();
  hapiContext.getParserConfiguration().setValidating(false); // don't validate during parsing
  
  // customize HapiContext some more ... e.g. enforce that PID-8 in ADT_A01 messages of version 2.4 is not empty
  ValidationRuleBuilder builder = new ValidationRuleBuilder() {
      @Override
      protected void configure() {
         forVersion(Version.V24)
              .message("ADT", "A01")
              .terser("PID-8", not(empty()));
         }
      };
  hapiContext.setValidationRuleBuilder(builder);

  HL7DataFormat hl7 = new HL7DataFormat();
  hl7.setHapiContext(hapiContext);

  from("direct:test1")
     .unmarshal(hl7)                // uses the GenericParser returned from the HapiContext
     .validate(messageConforms())   // uses the validation rules returned from the HapiContext
                                    // equivalent with .validate(messageConformsTo(hapiContext))
     // route continues from here
Copy to Clipboard Toggle word wrap

HL7 Acknowledgement expression

A common task in HL7v2 processing is to generate an acknowledgement message as response to an incoming HL7v2 message, e.g. based on a validation result. The ack expression lets us accomplish this very elegantly:
import static org.apache.camel.component.hl7.HL7.messageConformsTo;
import static org.apache.camel.component.hl7.HL7.ack;
import ca.uhn.hl7v2.validation.impl.DefaultValidation;
...

  // Use standard or define your own validation rules
   ValidationContext defaultContext = new DefaultValidation(); 

   from("direct:test1")
      .onException(Exception.class)
         .handled(true)
         .transform(ack()) // auto-generates negative ack because of exception in Exchange
         .end()
      .validate(messageConformsTo(defaultContext))
      // do something meaningful here
      ...
      // acknowledgement
      .transform(ack())
Copy to Clipboard Toggle word wrap

More Samples

In the following example, a plain String HL7 request is sent to an HL7 listener that sends back a response:
String line1 = "MSH|^~\\&|MYSENDER|MYRECEIVER|MYAPPLICATION||200612211200||QRY^A19|1234|P|2.4";
String line2 = "QRD|200612211200|R|I|GetPatient|||1^RD|0101701234|DEM||";

StringBuilder in = new StringBuilder();
in.append(line1);
in.append("\n");
in.append(line2);

String out = (String)template.requestBody("mina2:tcp://127.0.0.1:8888?sync=true&codec=#hl7codec", in.toString());
Copy to Clipboard Toggle word wrap
In the next sample, HL7 requests from the HL7 listener are routed to the business logic, which is implemented as plain POJO registered in the registry as hl7service:
public class MyHL7BusinessLogic {

    // This is a plain POJO that has NO imports whatsoever on Apache Camel.
    // its a plain POJO only importing the HAPI library so we can much easier work with the HL7 format.

    public Message handleA19(Message msg) throws Exception {
        // here you can have your business logic for A19 messages
        assertTrue(msg instanceof QRY_A19);
        // just return the same dummy response
        return createADR19Message();
    }

    public Message handleA01(Message msg) throws Exception {
        // here you can have your business logic for A01 messages
        assertTrue(msg instanceof ADT_A01);
        // just return the same dummy response
        return createADT01Message();
    }
}
Copy to Clipboard Toggle word wrap
Then the Camel routes using the RouteBuilder are as follows:
DataFormat hl7 = new HL7DataFormat();
// we setup or HL7 listener on port 8888 (using the hl7codec) and in sync mode so we can return a response
from("mina2:tcp://127.0.0.1:8888?sync=true&codec=#hl7codec")
    // we use the HL7 data format to unmarshal from HL7 stream to the HAPI Message model
    // this ensures that the camel message has been enriched with hl7 specific headers to
    // make the routing much easier (see below)
    .unmarshal(hl7)
    // using choice as the content base router
    .choice()
        // where we choose that A19 queries invoke the handleA19 method on our hl7service bean
        .when(header("CamelHL7TriggerEvent").isEqualTo("A19"))
            .beanRef("hl7service", "handleA19")
            .to("mock:a19")
        // and A01 should invoke the handleA01 method on our hl7service bean
        .when(header("CamelHL7TriggerEvent").isEqualTo("A01")).to("mock:a01")
            .beanRef("hl7service", "handleA01")
            .to("mock:a19")
        // other types should go to mock:unknown
        .otherwise()
            .to("mock:unknown")
    // end choice block
    .end()
    // marshal response back
    .marshal(hl7);
Copy to Clipboard Toggle word wrap
Note that by using the HL7 DataFormat the Camel message headers are populated with the fields from the MSH segment. The headers are particularly useful for filtering or content-based routing as shown in the example above.

Chapter 62. HTTP

HTTP Component

The http: component provides HTTP based endpoints for consuming external HTTP resources (as a client to call external servers using HTTP).
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-http</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

http:hostname[:port][/resourceUri][?param1=value1][&param2=value2]
Copy to Clipboard Toggle word wrap
Will by default use port 80 for HTTP and 443 for HTTPS.
camel-http vs camel-jetty
You can only produce to endpoints generated by the HTTP component. Therefore it should never be used as input into your camel Routes. To bind/expose an HTTP endpoint via a HTTP server as input to a camel route, you can use the Jetty Component or the Servlet component.

Examples

Call the url with the body using POST and return response as out message. If body is null call URL using GET and return response as out message
Expand
Java DSL Spring DSL
from("direct:start")
  .to("http://myhost/mypath");
Copy to Clipboard Toggle word wrap
<from uri="direct:start"/>
<to uri="http://oldhost"/>
Copy to Clipboard Toggle word wrap
You can override the HTTP endpoint URI by adding a header. Camel will call the http://newhost. This is very handy for e.g. REST urls.
Expand
Java DSL
from("direct:start")
  .setHeader(Exchange.HTTP_URI, simple("http://myserver/orders/${header.orderId}"))
  .to("http://dummyhost");
Copy to Clipboard Toggle word wrap
URI parameters can either be set directly on the endpoint URI or as a header
Expand
Java DSL
from("direct:start")
  .to("http://oldhost?order=123&detail=short");
from("direct:start")
  .setHeader(Exchange.HTTP_QUERY, constant("order=123&detail=short"))
  .to("http://oldhost");
Copy to Clipboard Toggle word wrap
Set the HTTP request method to POST
Expand
Java DSL Spring DSL
from("direct:start")
  .setHeader(Exchange.HTTP_METHOD, constant("POST"))
  .to("http://www.google.com");
Copy to Clipboard Toggle word wrap
<from uri="direct:start"/>
<setHeader headerName="CamelHttpMethod">
  <constant>POST</constant>
</setHeader>
<to uri="http://www.google.com"/>
<to uri="mock:results"/>
Copy to Clipboard Toggle word wrap

HttpEndpoint Options

Expand
Name Default Value Description
throwExceptionOnFailure true Option to disable throwing the HttpOperationFailedException in case of failed responses from the remote server. This allows you to get all responses regardless of the HTTP status code.
bridgeEndpoint false
If the option is true , HttpProducer will ignore the Exchange.HTTP_URI header, and use the endpoint's URI for request. You may also set the throwExceptionOnFailure to be false to let the HttpProducer send all the fault response back. Camel 2.3: If the option is true, HttpProducer and CamelServlet will skip the gzip processing if the content-encoding is "gzip".
disableStreamCache false DefaultHttpBinding will copy the request input stream into a stream cache and put it into message body if this option is false to support read it twice, otherwise DefaultHttpBinding will set the request input stream direct into the message body.
httpBindingRef null Deprecated and will be removed in Camel 3.0: Reference to a org.apache.camel.component.http.HttpBinding in the Registry. Use the httpBinding option instead.
httpBinding null Reference to a org.apache.camel.component.http.HttpBinding in the Registry.
httpClientConfigurerRef null Deprecated and will be removed in Camel 3.0: Reference to a org.apache.camel.component.http.HttpClientConfigurer in the Registry. Use the httpClientConfigurer option instead.
httpClientConfigurer null Reference to a org.apache.camel.component.http.HttpClientConfigurer in the Registry.
httpClient.XXX null Setting options on the HttpClientParams. For instance httpClient.soTimeout=5000 will set the SO_TIMEOUT to 5 seconds.
clientConnectionManager null To use a custom org.apache.http.conn.ClientConnectionManager.
transferException false Camel 2.6: If enabled and an Exchange failed processing on the consumer side, and if the caused Exception was send back serialized in the response as a application/x-java-serialized-object content type (for example using Jetty or Servlet Camel components). On the producer side the exception will be deserialized and thrown as is, instead of the HttpOperationFailedException. The caused exception is required to be serialized.
headerFilterStrategy null Camel 2.11: Reference to a instance of org.apache.camel.spi.HeaderFilterStrategy in the Registry. It will be used to apply the custom headerFilterStrategy on the new create HttpEndpoint.
urlRewrite null Camel 2.11:Producer only Refers to a custom org.apache.camel.component.http.UrlRewrite which allows you to rewrite urls when you bridge/proxy endpoints. See more details at UrlRewrite and How to use Camel as a HTTP proxy between a client and server.

Authentication and Proxy

The following authentication options can also be set on the HttpEndpoint:
Expand
Name Default Value Description
authMethod null Authentication method, either as Basic, Digest or NTLM.
authMethodPriority null Priority of authentication methods. Is a list separated with comma. For example: Basic,Digest to exclude NTLM.
authUsername null Username for authentication
authPassword null Password for authentication
authDomain null Domain for NTML authentication
authHost null Optional host for NTML authentication
proxyHost null The proxy host name
proxyPort null The proxy port number
proxyAuthMethod null Authentication method for proxy, either as Basic, Digest or NTLM.
proxyAuthUsername null Username for proxy authentication
proxyAuthPassword null Password for proxy authentication
proxyAuthDomain null Domain for proxy NTML authentication
proxyAuthHost null Optional host for proxy NTML authentication
When using authentication you must provide the choice of method for the authMethod or authProxyMethod options. You can configure the proxy and authentication details on either the HttpComponent or the HttpEndoint. Values provided on the HttpEndpoint will take precedence over HttpComponent. Its most likely best to configure this on the HttpComponent which allows you to do this once.
The HTTP component uses convention over configuration which means that if you have not explicit set a authMethodPriority then it will fallback and use the select(ed) authMethod as priority as well. So if you use authMethod.Basic then the auhtMethodPriority will be Basic only.

HttpComponent Options

Expand
Name Default Value Description
httpBinding null To use a custom org.apache.camel.component.http.HttpBinding.
httpClientConfigurer null To use a custom org.apache.camel.component.http.HttpClientConfigurer.
httpConnectionManager null To use a custom org.apache.commons.httpclient.HttpConnectionManager.
httpConfiguration null To use a custom org.apache.camel.component.http.HttpConfiguration

Message Headers

Expand
Name Type Description
Exchange.HTTP_URI String URI to call. Will override existing URI set directly on the endpoint.
Exchange.HTTP_METHOD String HTTP Method / Verb to use (GET/POST/PUT/DELETE/HEAD/OPTIONS/TRACE)
Exchange.HTTP_PATH String Request URI's path, the header will be used to build the request URI with the HTTP_URI. Camel 2.3.0: If the path is start with "/", http producer will try to find the relative path based on the Exchange.HTTP_BASE_URI header or the exchange.getFromEndpoint().getEndpointUri();
Exchange.HTTP_QUERY String URI parameters. Will override existing URI parameters set directly on the endpoint.
Exchange.HTTP_RESPONSE_CODE int The HTTP response code from the external server. Is 200 for OK.
Exchange.HTTP_CHARACTER_ENCODING String Character encoding.
Exchange.CONTENT_TYPE String The HTTP content type. Is set on both the IN and OUT message to provide a content type, such as text/html.
Exchange.CONTENT_ENCODING String The HTTP content encoding. Is set on both the IN and OUT message to provide a content encoding, such as gzip.
Exchange.HTTP_SERVLET_REQUEST HttpServletRequest The HttpServletRequest object.
Exchange.HTTP_SERVLET_RESPONSE HttpServletResponse The HttpServletResponse object.
Exchange.HTTP_PROTOCOL_VERSION String Camel 2.5: You can set the http protocol version with this header, eg. "HTTP/1.0". If you didn't specify the header, HttpProducer will use the default value "HTTP/1.1"
The header name above are constants. For the spring DSL you have to use the value of the constant instead of the name.

Message Body

Camel will store the HTTP response from the external server on the OUT body. All headers from the IN message will be copied to the OUT message, so headers are preserved during routing. Additionally Camel will add the HTTP response headers as well to the OUT message headers.

Response code

Camel will handle according to the HTTP response code:
  • Response code is in the range 100..299, Camel regards it as a success response.
  • Response code is in the range 300..399, Camel regards it as a redirection response and will throw a HttpOperationFailedException with the information.
  • Response code is 400+, Camel regards it as an external server failure and will throw a HttpOperationFailedException with the information.
    throwExceptionOnFailure
    The option, throwExceptionOnFailure, can be set to false to prevent the HttpOperationFailedException from being thrown for failed response codes. This allows you to get any response from the remote server. There is a sample below demonstrating this.

HttpOperationFailedException

This exception contains the following information:
  • The HTTP status code
  • The HTTP status line (text of the status code)
  • Redirect location, if server returned a redirect
  • Response body as a java.lang.String, if server provided a body as response

Calling using GET or POST

The following algorithm is used to determine if either GET or POST HTTP method should be used: 1. Use method provided in header. 2. GET if query string is provided in header. 3. GET if endpoint is configured with a query string. 4. POST if there is data to send (body is not null). 5. GET otherwise.
You can get access to these two using the Camel type converter system using
HttpServletRequest request = exchange.getIn().getBody(HttpServletRequest.class);
HttpServletRequest response = exchange.getIn().getBody(HttpServletResponse.class);
Copy to Clipboard Toggle word wrap

Using client timeout - SO_TIMEOUT

See the unit test in this link

Configuring a Proxy

Expand
Java DSL
from("direct:start")
  .to("http://oldhost?proxyHost=www.myproxy.com&proxyPort=80");
Copy to Clipboard Toggle word wrap
There is also support for proxy authentication via the proxyUsername and proxyPassword options.

Using proxy settings outside of URI

Expand
Java DSL Spring DSL
 context.getProperties().put("http.proxyHost", "172.168.18.9");
 context.getProperties().put("http.proxyPort" "8080");
Copy to Clipboard Toggle word wrap
   <camelContext>
       <properties>
           <property key="http.proxyHost" value="172.168.18.9"/>
           <property key="http.proxyPort" value="8080"/>
      </properties>
   </camelContext>
Copy to Clipboard Toggle word wrap
Options on Endpoint will override options on the context.

Configuring charset

If you are using POST to send data you can configure the charset
setProperty(Exchange.CHARSET_NAME, "iso-8859-1");
Copy to Clipboard Toggle word wrap

Sample with scheduled poll

The sample polls the Google homepage every 10 seconds and write the page to the file message.html:
from("timer://foo?fixedRate=true&delay=0&period=10000")
    .to("http://www.google.com")
    .setHeader(FileComponent.HEADER_FILE_NAME, "message.html").to("file:target/google");
Copy to Clipboard Toggle word wrap

Getting the Response Code

You can get the HTTP response code from the HTTP component by getting the value from the Out message header with Exchange.HTTP_RESPONSE_CODE.
   Exchange exchange = template.send("http://www.google.com/search", new Processor() {
            public void process(Exchange exchange) throws Exception {
                exchange.getIn().setHeader(Exchange.HTTP_QUERY, constant("hl=en&q=activemq"));
            }
   });
   Message out = exchange.getOut();
   int responseCode = out.getHeader(Exchange.HTTP_RESPONSE_CODE, Integer.class);
Copy to Clipboard Toggle word wrap
In the route below we want to route a message that we enrich with data returned from a remote HTTP call. As we want any response from the remote server, we set the throwExceptionOnFailure option to false so we get any response in the AggregationStrategy. As the code is based on a unit test that simulates a HTTP status code 404, there is some assertion code etc.
// We set throwExceptionOnFailure to false to let Camel return any response from the remove HTTP server without thrown
// HttpOperationFailedException in case of failures.
// This allows us to handle all responses in the aggregation strategy where we can check the HTTP response code
// and decide what to do. As this is based on an unit test we assert the code is 404
from("direct:start").enrich("http://localhost:{{port}}/myserver?throwExceptionOnFailure=false&user=Camel", new AggregationStrategy() {
    public Exchange aggregate(Exchange original, Exchange resource) {
        // get the response code
        Integer code = resource.getIn().getHeader(Exchange.HTTP_RESPONSE_CODE, Integer.class);
        assertEquals(404, code.intValue());
        return resource;
    }
}).to("mock:result");

// this is our jetty server where we simulate the 404
from("jetty://http://localhost:{{port}}/myserver")
        .process(new Processor() {
            public void process(Exchange exchange) throws Exception {
                exchange.getOut().setBody("Page not found");
                exchange.getOut().setHeader(Exchange.HTTP_RESPONSE_CODE, 404);
            }
        });
Copy to Clipboard Toggle word wrap

Disabling Cookies

To disable cookies you can set the HTTP Client to ignore cookies by adding this URI option: httpClient.cookiePolicy=ignoreCookies

Advanced Usage

If you need more control over the HTTP producer you should use the HttpComponent where you can set various classes to give you custom behavior.

Setting MaxConnectionsPerHost

The HTTP Component has a org.apache.commons.httpclient.HttpConnectionManager where you can configure various global configuration for the given component. By global, we mean that any endpoint the component creates has the same shared HttpConnectionManager. So, if we want to set a different value for the max connection per host, we need to define it on the HTTP component and not on the endpoint URI that we usually use. So here comes:
First, we define the http component in Spring XML. Yes, we use the same scheme name, http, because otherwise Camel will auto-discover and create the component with default settings. What we need is to overrule this so we can set our options. In the sample below we set the max connection to 5 instead of the default of 2.
<bean id="http" class="org.apache.camel.component.http.HttpComponent">
    <property name="camelContext" ref="camel"/>
    <property name="httpConnectionManager" ref="myHttpConnectionManager"/>
</bean>

<bean id="myHttpConnectionManager" class="org.apache.commons.httpclient.MultiThreadedHttpConnectionManager">
    <property name="params" ref="myHttpConnectionManagerParams"/>
</bean>

<bean id="myHttpConnectionManagerParams" class="org.apache.commons.httpclient.params.HttpConnectionManagerParams">
    <property name="defaultMaxConnectionsPerHost" value="5"/>
</bean>

Copy to Clipboard Toggle word wrap
And then we can just use it as we normally do in our routes:
<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring" trace="true">
    <route>
        <from uri="direct:start"/>
        <to uri="http://www.google.com"/>
        <to uri="mock:result"/>
    </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Using preemptive authentication

An end user reported that he had problem with authenticating with HTTPS. The problem was eventually resolved when he discovered the HTTPS server did not return a HTTP code 401 Authorization Required. The solution was to set the following URI option: httpClient.authenticationPreemptive=true
See this link from a mailing list discussion with some code to outline how to do this with the Apache Commons HTTP API.

Using the JSSE Configuration Utility

As of Camel 2.8, the HTTP4 component supports SSL/TLS configuration through the Camel JSSE Configuration Utility.  This utility greatly decreases the amount of component specific code you need to write and is configurable at the endpoint and component levels. The following examples demonstrate how to use the utility with the HTTP4 component.
The version of the Apache HTTP client used in this component resolves SSL/TLS information from a global "protocol" registry. This component provides an implementation, org.apache.camel.component.http.SSLContextParametersSecureProtocolSocketFactory, of the HTTP client's protocol socket factory in order to support the use of the Camel JSSE Configuration utility. The following example demonstrates how to configure the protocol registry and use the registered protocol information in a route.
KeyStoreParameters ksp = new KeyStoreParameters();
ksp.setResource("/users/home/server/keystore.jks");
ksp.setPassword("keystorePassword");

KeyManagersParameters kmp = new KeyManagersParameters();
kmp.setKeyStore(ksp);
kmp.setKeyPassword("keyPassword");

SSLContextParameters scp = new SSLContextParameters();
scp.setKeyManagers(kmp);

ProtocolSocketFactory factory =
    new SSLContextParametersSecureProtocolSocketFactory(scp);

Protocol.registerProtocol("https",
        new Protocol(
        "https",
        factory,
        443));

from("direct:start")
        .to("https://mail.google.com/mail/").to("mock:results");
Copy to Clipboard Toggle word wrap

Configuring Apache HTTP Client Directly

Basically the HTTP component is built on the top of Apache HTTP client, and you can implement a custom org.apache.camel.component.http.HttpClientConfigurer to do some configuration on the http client if you need full control of it.
However if you just want to specify the keystore and truststore you can do this with Apache HTTP HttpClientConfigurer, for example:
Protocol authhttps = new Protocol("https", new AuthSSLProtocolSocketFactory(
  new URL("file:my.keystore"), "mypassword",
  new URL("file:my.truststore"), "mypassword"), 443);

Protocol.registerProtocol("https", authhttps);
Copy to Clipboard Toggle word wrap
And then you need to create a class that implements HttpClientConfigurer, and registers https protocol providing a keystore or truststore per example above. Then, from your camel route builder class you can hook it up like so:
HttpComponent httpComponent = getContext().getComponent("http", HttpComponent.class);
httpComponent.setHttpClientConfigurer(new MyHttpClientConfigurer());
Copy to Clipboard Toggle word wrap
If you are doing this using the Spring DSL, you can specify your HttpClientConfigurer using the URI. For example:
<bean id="myHttpClientConfigurer"
 class="my.https.HttpClientConfigurer">
</bean>

<to uri="https://myhostname.com:443/myURL?httpClientConfigurerRef=myHttpClientConfigurer"/>
Copy to Clipboard Toggle word wrap
As long as you implement the HttpClientConfigurer and configure your keystore and truststore as described above, it will work fine.

Chapter 63. HTTP4

HTTP4 Component

Available as of Camel 2.3
The http4: component provides HTTP based endpoints for calling external HTTP resources (as a client to call external servers using HTTP).
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-http4</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap
camel-http4 vs camel-http
Camel-http4 uses Apache HttpClient 4.x while camel-http uses Apache HttpClient 3.x.

URI format

http4:hostname[:port][/resourceUri][?options]
Copy to Clipboard Toggle word wrap
Will by default use port 80 for HTTP and 443 for HTTPS.
You can append query options to the URI in the following format, ?option=value&option=value&...
camel-http4 vs camel-jetty
You can only produce to endpoints generated by the HTTP4 component. Therefore it should never be used as input into your Camel Routes. To bind/expose an HTTP endpoint via a HTTP server as input to a Camel route, use the Jetty Component instead.

HttpComponent Options

Expand
Name Default Value Description
maxTotalConnections 200 The maximum number of connections.
connectionsPerRoute 20 The maximum number of connections per route.
cookieStore null Camel 2.11.2/2.12.0: To use a custom org.apache.http.client.CookieStore. By default the org.apache.http.impl.client.BasicCookieStore is used which is an in-memory only cookie store. Notice if bridgeEndpoint=true then the cookie store is forced to be a noop cookie store as cookies shouldn't be stored as we are just bridging (eg acting as a proxy).
httpClientConfigurer null Reference to a org.apache.camel.component.http.HttpClientConfigurer in the Registry.
clientConnectionManager null To use a custom org.apache.http.conn.ClientConnectionManager.
httpBinding null To use a custom org.apache.camel.component.http.HttpBinding.
httpContext null Camel 2.9.2: To use a custom org.apache.http.protocol.HttpContext when executing requests.
sslContextParameters null Camel 2.8: To use a custom org.apache.camel.util.jsse.SSLContextParameters. See Using the JSSE Configuration Utility.
x509HostnameVerifier BrowserCompatHostnameVerifier Camel 2.7: You can refer to a different org.apache.http.conn.ssl.X509HostnameVerifier instance in the Registry such as org.apache.http.conn.ssl.StrictHostnameVerifier or org.apache.http.conn.ssl.AllowAllHostnameVerifier.
connectionTimeToLive -1 Camel 2.11.0: The time for connection to live, the time unit is millisecond, the default value is always keep alive.

HttpEndpoint Options

Expand
Name Default Value Description
throwExceptionOnFailure true Option to disable throwing the HttpOperationFailedException in case of failed responses from the remote server. This allows you to get all responses regardless of the HTTP status code.
bridgeEndpoint false If true, HttpProducer will ignore the Exchange.HTTP_URI header, and use the endpoint's URI for request. You may also set the throwExcpetionOnFailure to be false to let the HttpProducer send all fault responses back. Also if set to true HttpProducer and CamelServlet will skip the gzip processing if the content-encoding is "gzip".
clearExpiredCookies true Camel 2.11.2/2.12.0: Whether to clear expired cookies before sending the HTTP request. This ensures the cookies store does not keep growing by adding new cookies which is newer removed when they are expired.
cookieStore null Camel 2.11.2/2.12.0: To use a custom org.apache.http.client.CookieStore. By default the org.apache.http.impl.client.BasicCookieStore is used which is an in-memory only cookie store. Notice if bridgeEndpoint=true then the cookie store is forced to be a noop cookie store as cookies shouldn't be stored as we are just bridging (eg acting as a proxy).
disableStreamCache false DefaultHttpBinding will copy the request input stream into a stream cache and put it into the message body if this option is false to support multiple reads, otherwise DefaultHttpBinding will set the request input stream directly in the message body.
headerFilterStrategy null Camel 2.10.4: Reference to a instance of org.apache.camel.spi.HeaderFilterStrategy in the Registry. t will be used to apply the custom headerFilterStrategy on the new create HttpEndpoint.
httpBindingRef null Deprecated and will be removed in Camel 3.0: Reference to a org.apache.camel.component.http.HttpBinding in the Registry. Use the httpBinding option instead.
httpBinding null To use a custom org.apache.camel.component.http.HttpBinding.
httpClientConfigurerRef null Deprecated and will be removed in Camel 3.0: Reference to a org.apache.camel.component.http.HttpClientConfigurer in the Registry. Use the httpClientConfigurer option instead.
httpClientConfigurer null Reference to a org.apache.camel.component.http.HttpClientConfigurer in the Registry.
httpContextRef null Deprecated and will be removed in Camel 3.0:Camel 2.9.2: Reference to a custom org.apache.http.protocol.HttpContext in the Registry. Use the httpContext option instead.
httpContext null Camel 2.9.2: To use a custom org.apache.http.protocol.HttpContext when executing requests.
httpClient.XXX null
Setting options on the BasicHttpParams. For instance httpClient.soTimeout=5000 will set the SO_TIMEOUT to 5 seconds. Look on the setter methods of the following parameter beans for a complete reference: AuthParamBean, ClientParamBean, ConnConnectionParamBean, ConnRouteParamBean, CookieSpecParamBean, HttpConnectionParamBean and HttpProtocolParamBean
Since Camel 2.13.0: httpClient is changed to configure the HttpClientBuilder and RequestConfig.Builder, please check out API document for a complete reference.
clientConnectionManager null To use a custom org.apache.http.conn.ClientConnectionManager.
transferException false If enabled and an Exchange failed processing on the consumer side, and if the caused Exception was send back serialized in the response as a application/x-java-serialized-object content type (for example using Jetty or SERVLET Camel components). On the producer side the exception will be deserialized and thrown as is, instead of the HttpOperationFailedException. The caused exception is required to be serialized.
sslContextParametersRef null Deprecated and will be removed in Camel 3.0:Camel 2.8: Reference to a org.apache.camel.util.jsse.SSLContextParameters in the Registry. Important: Only one instance of org.apache.camel.util.jsse.SSLContextParameters is supported per HttpComponent. If you need to use 2 or more different instances, you need to define a new HttpComponent per instance you need. See further below for more details. See Using the JSSE Configuration Utility. Use the sslContextParameters option instead.
sslContextParameters null Camel 2.11.1: Reference to a org.apache.camel.util.jsse.SSLContextParameters in the Registry. Important: Only one instance of org.apache.camel.util.jsse.SSLContextParameters is supported per HttpComponent. If you need to use 2 or more different instances, you need to define a new HttpComponent per instance you need. See further below for more details. See Using the JSSE Configuration Utility.
x509HostnameVerifier BrowserCompatHostnameVerifier Camel 2.7: You can refer to a different org.apache.http.conn.ssl.X509HostnameVerifier instance in the Registry such as org.apache.http.conn.ssl.StrictHostnameVerifier or org.apache.http.conn.ssl.AllowAllHostnameVerifier.
urlRewrite null Camel 2.11:Producer only Refers to a custom org.apache.camel.component.http4.UrlRewrite which allows you to rewrite urls when you bridge/proxy endpoints. See more details at UrlRewrite and How to use Camel as a HTTP proxy between a client and server.
maxTotalConnections
null
Camel 2.14: The maximum number of total connections that the connection manager has. If this option is not set, camel will use the component's setting instead.
connectionsPerRoute
null
Camel 2.14: The maximum number of connections per route. If this option is not set, camel will use the component's setting instead.
authenticationPreemptive
false
Camel 2.11.3/2.12.2: If this option is true, camel-http4 sends preemptive basic authentication to the server.
The following authentication options can also be set on the HttpEndpoint:

Setting Basic Authentication and Proxy

Before Camel 2.8.0
Expand
Name Default Value Description
username null Username for authentication.
password null Password for authentication.
domain null The domain name for authentication.
host null The host name authentication.
proxyHost null The proxy host name
proxyPort null The proxy port number
proxyUsername null Username for proxy authentication
proxyPassword null Password for proxy authentication
proxyDomain null The proxy domain name
proxyNtHost null The proxy Nt host name
Name Default Value Description
authUsername null Username for authentication
authPassword null Password for authentication
authDomain null The domain name for authentication
authHost null The host name authentication
proxyAuthHost null The proxy host name
proxyAuthPort null The proxy port number
proxyAuthScheme null The proxy scheme, will fallback and use the scheme from the endpoint if not configured.
proxyAuthUsername null Username for proxy authentication
proxyAuthPassword null Password for proxy authentication
proxyAuthDomain null The proxy domain name
proxyAuthNtHost null The proxy Nt host name

Message Headers

Expand
Name Type Description
Exchange.HTTP_URI String URI to call. Will override existing URI set directly on the endpoint.
Exchange.HTTP_PATH String Request URI's path, the header will be used to build the request URI with the HTTP_URI.
Exchange.HTTP_QUERY String URI parameters. Will override existing URI parameters set directly on the endpoint.
Exchange.HTTP_RESPONSE_CODE int The HTTP response code from the external server. Is 200 for OK.
Exchange.HTTP_CHARACTER_ENCODING String Character encoding.
Exchange.CONTENT_TYPE String The HTTP content type. Is set on both the IN and OUT message to provide a content type, such as text/html.
Exchange.CONTENT_ENCODING String The HTTP content encoding. Is set on both the IN and OUT message to provide a content encoding, such as gzip.

Message Body

Camel will store the HTTP response from the external server on the OUT body. All headers from the IN message will be copied to the OUT message, so headers are preserved during routing. Additionally Camel will add the HTTP response headers as well to the OUT message headers.

Response code

Camel will handle according to the HTTP response code:
  • Response code is in the range 100..299, Camel regards it as a success response.
  • Response code is in the range 300..399, Camel regards it as a redirection response and will throw a HttpOperationFailedException with the information.
  • Response code is 400+, Camel regards it as an external server failure and will throw a HttpOperationFailedException with the information.
    throwExceptionOnFailure
    The option, throwExceptionOnFailure, can be set to false to prevent the HttpOperationFailedException from being thrown for failed response codes. This allows you to get any response from the remote server. There is a sample below demonstrating this.

HttpOperationFailedException

This exception contains the following information:
  • The HTTP status code
  • The HTTP status line (text of the status code)
  • Redirect location, if server returned a redirect
  • Response body as a java.lang.String, if server provided a body as response

Calling using GET or POST

The following algorithm is used to determine whether the GET or POST HTTP method should be used: 1. Use method provided in header. 2. GET if query string is provided in header. 3. GET if endpoint is configured with a query string. 4. POST if there is data to send (body is not null). 5. GET otherwise.
You can get access to these two using the Camel type converter system using NOTE You can get the request and response not just from the processor after the camel-jetty or camel-cxf endpoint.
HttpServletRequest request = exchange.getIn().getBody(HttpServletRequest.class);
HttpServletRequest response = exchange.getIn().getBody(HttpServletResponse.class);
Copy to Clipboard Toggle word wrap

Configuring URI to call

You can set the HTTP producer's URI directly form the endpoint URI. In the route below, Camel will call out to the external server, oldhost, using HTTP.
from("direct:start")
	    .to("http4://oldhost");
Copy to Clipboard Toggle word wrap
And the equivalent Spring sample:
<camelContext xmlns="http://activemq.apache.org/camel/schema/spring">
  <route>
    <from uri="direct:start"/>
    <to uri="http4://oldhost"/>
  </route>
</camelContext>
Copy to Clipboard Toggle word wrap
You can override the HTTP endpoint URI by adding a header with the key, Exchange.HTTP_URI, on the message.
from("direct:start")
  .setHeader(Exchange.HTTP_URI, constant("http://newhost"))
  .to("http4://oldhost");
Copy to Clipboard Toggle word wrap
In the sample above Camel will call the http://newhost despite the endpoint is configured with http4://oldhost. If the http4 endpoint is working in bridge mode, it will ignore the message header of Exchange.HTTP_URI.

Configuring URI Parameters

The http producer supports URI parameters to be sent to the HTTP server. The URI parameters can either be set directly on the endpoint URI or as a header with the key Exchange.HTTP_QUERY on the message.
from("direct:start")
 .to("http4://oldhost?order=123&detail=short");
Copy to Clipboard Toggle word wrap
Or options provided in a header:
from("direct:start")
  .setHeader(Exchange.HTTP_QUERY, constant("order=123&detail=short"))
  .to("http4://oldhost");
Copy to Clipboard Toggle word wrap
The HTTP4 component provides a way to set the HTTP request method by setting the message header. Here is an example:
from("direct:start")
  .setHeader(Exchange.HTTP_METHOD, constant(org.apache.camel.component.http4.HttpMethods.POST))
  .to("http4://www.google.com")
  .to("mock:results");
Copy to Clipboard Toggle word wrap
The method can be written a bit shorter using the string constants:
.setHeader("CamelHttpMethod", constant("POST"))
Copy to Clipboard Toggle word wrap
And the equivalent Spring sample:
<camelContext xmlns="http://activemq.apache.org/camel/schema/spring">
  <route>
    <from uri="direct:start"/>
    <setHeader headerName="CamelHttpMethod">
        <constant>POST</constant>
    </setHeader>
    <to uri="http4://www.google.com"/>
    <to uri="mock:results"/>
  </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Using client timeout - SO_TIMEOUT

See the HttpSOTimeoutTest unit test.

Configuring a Proxy

The HTTP4 component provides a way to configure a proxy.
from("direct:start")
  .to("http4://oldhost?proxyAuthHost=www.myproxy.com&proxyAuthPort=80");
Copy to Clipboard Toggle word wrap
There is also support for proxy authentication via the proxyAuthUsername and proxyAuthPassword options.

Using proxy settings outside of URI

To avoid System properties conflicts, you can set proxy configuration only from the CamelContext or URI. Java DSL :
 context.getProperties().put("http.proxyHost", "172.168.18.9");
 context.getProperties().put("http.proxyPort" "8080");
Copy to Clipboard Toggle word wrap
Spring XML
   <camelContext>
       <properties>
           <property key="http.proxyHost" value="172.168.18.9"/>
           <property key="http.proxyPort" value="8080"/>
      </properties>
   </camelContext>
Copy to Clipboard Toggle word wrap
Camel will first set the settings from Java System or CamelContext Properties and then the endpoint proxy options if provided. So you can override the system properties with the endpoint options.
Notice in Camel 2.8 there is also a http.proxyScheme property you can set to explicit configure the scheme to use.

Configuring charset

If you are using POST to send data you can configure the charset using the Exchange property:
exchange.setProperty(Exchange.CHARSET_NAME, "ISO-8859-1");
Copy to Clipboard Toggle word wrap

Sample with scheduled poll

This sample polls the Google homepage every 10 seconds and write the page to the file message.html:
from("timer://foo?fixedRate=true&delay=0&period=10000")
    .to("http4://www.google.com")
    .setHeader(FileComponent.HEADER_FILE_NAME, "message.html")
    .to("file:target/google");
Copy to Clipboard Toggle word wrap

URI Parameters from the endpoint URI

In this sample we have the complete URI endpoint that is just what you would have typed in a web browser. Multiple URI parameters can of course be set using the & character as separator, just as you would in the web browser. Camel does no tricks here.
// we query for Camel at the Google page
template.sendBody("http4://www.google.com/search?q=Camel", null);
Copy to Clipboard Toggle word wrap

URI Parameters from the Message

Map headers = new HashMap();
headers.put(Exchange.HTTP_QUERY, "q=Camel&lr=lang_en");
// we query for Camel and English language at Google
template.sendBody("http4://www.google.com/search", null, headers);
Copy to Clipboard Toggle word wrap
In the header value above notice that it should not be prefixed with ? and you can separate parameters as usual with the & char.

Getting the Response Code

You can get the HTTP response code from the HTTP4 component by getting the value from the Out message header with Exchange.HTTP_RESPONSE_CODE.
Exchange exchange = template.send("http4://www.google.com/search", new Processor() {
  public void process(Exchange exchange) throws Exception {
    exchange.getIn().setHeader(Exchange.HTTP_QUERY, constant("hl=en&q=activemq"));
  }
});
Message out = exchange.getOut();
int responseCode = out.getHeader(Exchange.HTTP_RESPONSE_CODE, Integer.class);
Copy to Clipboard Toggle word wrap

Disabling Cookies

To disable cookies you can set the HTTP Client to ignore cookies by adding this URI option: httpClient.cookiePolicy=ignoreCookies

Advanced Usage

If you need more control over the HTTP producer you should use the HttpComponent where you can set various classes to give you custom behavior.

Using the JSSE Configuration Utility

As of Camel 2.8, the HTTP4 component supports SSL/TLS configuration through the Camel JSSE Configuration Utility. This utility greatly decreases the amount of component specific code you need to write and is configurable at the endpoint and component levels. The following examples demonstrate how to use the utility with the HTTP4 component.

Programmatic configuration of the component

KeyStoreParameters ksp = new KeyStoreParameters();
ksp.setResource("/users/home/server/keystore.jks");
ksp.setPassword("keystorePassword");

KeyManagersParameters kmp = new KeyManagersParameters();
kmp.setKeyStore(ksp);
kmp.setKeyPassword("keyPassword");

SSLContextParameters scp = new SSLContextParameters();
scp.setKeyManagers(kmp);

HttpComponent httpComponent = getContext().getComponent("https4", HttpComponent.class);
httpComponent.setSslContextParameters(scp);
Copy to Clipboard Toggle word wrap

Spring DSL based configuration of endpoint

...
  <camel:sslContextParameters
      id="sslContextParameters">
    <camel:keyManagers
        keyPassword="keyPassword">
      <camel:keyStore
          resource="/users/home/server/keystore.jks"
          password="keystorePassword"/>
    </camel:keyManagers>
  </camel:sslContextParameters>...
...
  <to uri="https4://127.0.0.1/mail/?sslContextParametersRef=sslContextParameters"/>...
Copy to Clipboard Toggle word wrap

Configuring Apache HTTP Client Directly

Basically camel-http4 component is built on the top of Apache HttpClient. Please refer to SSL/TLS customization for details or have a look into the org.apache.camel.component.http4.HttpsServerTestSupport unit test base class. You can also implement a custom org.apache.camel.component.http4.HttpClientConfigurer to do some configuration on the http client if you need full control of it.
However if you just want to specify the keystore and truststore you can do this with Apache HTTP HttpClientConfigurer, for example:
KeyStore keystore = ...;
KeyStore truststore = ...;

SchemeRegistry registry = new SchemeRegistry();
registry.register(new Scheme("https", 443, new SSLSocketFactory(keystore, "mypassword", truststore)));
Copy to Clipboard Toggle word wrap
And then you need to create a class that implements HttpClientConfigurer, and registers https protocol providing a keystore or truststore per example above. Then, from your camel route builder class you can hook it up like so:
HttpComponent httpComponent = getContext().getComponent("http4", HttpComponent.class);
httpComponent.setHttpClientConfigurer(new MyHttpClientConfigurer());
Copy to Clipboard Toggle word wrap
If you are doing this using the Spring DSL, you can specify your HttpClientConfigurer using the URI. For example:
<bean id="myHttpClientConfigurer"
 class="my.https.HttpClientConfigurer">
</bean>

<to uri="https4://myhostname.com:443/myURL?httpClientConfigurer=myHttpClientConfigurer"/>
Copy to Clipboard Toggle word wrap
As long as you implement the HttpClientConfigurer and configure your keystore and truststore as described above, it will work fine.

Using HTTPS to authenticate gotchas

An end user reported that he had problem with authenticating with HTTPS. The problem was eventually resolved by providing a custom configured org.apache.http.protocol.HttpContext:
1. Create a (Spring) factory for HttpContexts:
public class HttpContextFactory {

  private String httpHost = "localhost";
  private String httpPort = 9001;

  private BasicHttpContext httpContext = new BasicHttpContext();
  private BasicAuthCache authCache = new BasicAuthCache();
  private BasicScheme basicAuth = new BasicScheme();

  public HttpContext getObject() {
    authCache.put(new HttpHost(httpHost, httpPort), basicAuth);

    httpContext.setAttribute(ClientContext.AUTH_CACHE, authCache);

    return httpContext;
  }

  // getter and setter
}
Copy to Clipboard Toggle word wrap
2. Declare an HttpContext in the Spring application context file:
<bean id="myHttpContext" factory-bean="httpContextFactory" factory-method="getObject"/>
Copy to Clipboard Toggle word wrap
3. Reference the context in the http4 URL:
<to uri="https4://myhostname.com:443/myURL?httpContext=myHttpContext"/>
Copy to Clipboard Toggle word wrap

Using different SSLContextParameters

The HTTP4 component only support one instance of org.apache.camel.util.jsse.SSLContextParameters per component. If you need to use 2 or more different instances, then you need to setup multiple HTTP4 components as shown below. Where we have 2 components, each using their own instance of sslContextParameters property.
<bean id="http4-foo" class="org.apache.camel.component.http4.HttpComponent">
   <property name="sslContextParameters" ref="sslContextParams1"/>
   <property name="x509HostnameVerifier" ref="hostnameVerifier"/>
</bean>

<bean id="http4-bar" class="org.apache.camel.component.http4.HttpComponent">
   <property name="sslContextParameters" ref="sslContextParams2"/>
   <property name="x509HostnameVerifier" ref="hostnameVerifier"/>
</bean>
Copy to Clipboard Toggle word wrap

Chapter 64. iBATIS

iBATIS

The ibatis: component allows you to query, poll, insert, update and delete data in a relational database using Apache iBATIS.
Prefer MyBatis
The Apache iBatis project is no longer active. The project is moved outside Apache and is now know as the MyBatis project. Therefore we encourage users to use MyBatis instead. This camel-ibatis component will be removed in Camel 3.0.
iBatis does not support Spring 4.x. So you can only use Spring 3.x or older with iBatis.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-ibatis</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

ibatis:statementName[?options]
Copy to Clipboard Toggle word wrap
Where statementName is the name in the iBATIS XML configuration file which maps to the query, insert, update or delete operation you wish to evaluate.
You can append query options to the URI in the following format, ?option=value&option=value&...
This component will by default load the iBatis SqlMapConfig file from the root of the classpath and expected named as SqlMapConfig.xml. It uses Spring resource loading so you can define it using classpath, file or http as prefix to load resources with those schemes. In Camel 2.2 you can configure this on the iBatisComponent with the setSqlMapConfig(String) method.

Options

Expand
Option Type Default Description
consumer.onConsume String null Statements to run after consuming. Can be used, for example, to update rows after they have been consumed and processed in Apache Camel. See sample later. Multiple statements can be separated with comma.
consumer.useIterator boolean true If true each row returned when polling will be processed individually. If false the entire List of data is set as the IN body.
consumer.routeEmptyResultSet boolean false Apache Camel 2.0: Sets whether empty result set should be routed or not. By default, empty result sets are not routed.
statementType StatementType null Apache Camel 1.6.1/2.0: Mandatory to specify for IbatisProducer to control which iBatis SqlMapClient method to invoke. The enum values are: QueryForObject, QueryForList, Insert, Update, Delete.
maxMessagesPerPoll int 0 Apache Camel 2.0: An integer to define a maximum messages to gather per poll. By default, no maximum is set. Can be used to set a limit of e.g. 1000 to avoid when starting up the server that there are thousands of files. Set a value of 0 or negative to disabled it.
isolation String TRANSACTION_REPEATABLE_READ *Camel 2.9:* A String the defines the transaction isolation level of the will be used. Allowed values are TRANSACTION_NONE, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_READ_COMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE
Expand
isolation String TRANSACTION_REPEATABLE_READ *Camel 2.9:* A String the defines the transaction isolation level of the will be used. Allowed values are TRANSACTION_NONE, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_READ_COMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE

Message Headers

Apache Camel will populate the result message, either IN or OUT with a header with the operationName used:
Expand
Header Type Description
CamelIBatisStatementName String Apache Camel 2.0: The statementName used (for example: insertAccount).
CamelIBatisResult Object Apache Camel 1.6.2/2.0: The response returned from iBatis in any of the operations. For instance an INSERT could return the auto-generated key, or number of rows etc.

Message Body

Apache Camel 1.6.2/2.0: The response from iBatis will only be set as body if it's a SELECT statement. That means, for example, for INSERT statements Apache Camel will not replace the body. This allows you to continue routing and keep the original body. The response from iBatis is always stored in the header with the key CamelIBatisResult.

Samples

For example if you wish to consume beans from a JMS queue and insert them into a database you could do the following:
from("activemq:queue:newAccount").
  to("ibatis:insertAccount?statementType=Insert");
Copy to Clipboard Toggle word wrap
Notice we have to specify the statementType, as we need to instruct Apache Camel which SqlMapClient operation to invoke.
Where insertAccount is the iBatis ID in the SQL map file:
  <!-- Insert example, using the Account parameter class -->
  <insert id="insertAccount" parameterClass="Account">
    insert into ACCOUNT (
      ACC_ID,
      ACC_FIRST_NAME,
      ACC_LAST_NAME,
      ACC_EMAIL
    )
    values (
      #id#, #firstName#, #lastName#, #emailAddress#
    )
  </insert>
Copy to Clipboard Toggle word wrap

Using StatementType for better control of IBatis

Available as of Apache Camel 1.6.1/2.0 When routing to an iBatis endpoint you want more fine grained control so you can control whether the SQL statement to be executed is a SELEECT, UPDATE, DELETE or INSERT etc. This is now possible in Apache Camel 1.6.1/2.0. So for instance if we want to route to an iBatis endpoint in which the IN body contains parameters to a SELECT statement we can do:
from("direct:start")
    .to("ibatis:selectAccountById?statementType=QueryForObject")
    .to("mock:result");
Copy to Clipboard Toggle word wrap
In the code above we can invoke the iBatis statement selectAccountById and the IN body should contain the account id we want to retrieve, such as an Integer type.
We can do the same for some of the other operations, such as QueryForList:
from("direct:start")
    .to("ibatis:selectAllAccounts?statementType=QueryForList")
    .to("mock:result");
Copy to Clipboard Toggle word wrap
And the same for UPDATE, where we can send an Account object as IN body to iBatis:
from("direct:start")
    .to("ibatis:updateAccount?statementType=Update")
    .to("mock:result");
Copy to Clipboard Toggle word wrap

Scheduled polling example

Since this component does not support scheduled polling, you need to use another mechanism for triggering the scheduled polls, such as the Timer or Quartz components.
In the sample below we poll the database, every 30 seconds using the Timer component and send the data to the JMS queue:
from("timer://pollTheDatabase?delay=30000").to("ibatis:selectAllAccounts?statementType=QueryForList").to("activemq:queue:allAccounts");
Copy to Clipboard Toggle word wrap
And the iBatis SQL map file used:
  <!-- Select with no parameters using the result map for Account class. -->
  <select id="selectAllAccounts" resultMap="AccountResult">
    select * from ACCOUNT
  </select>
Copy to Clipboard Toggle word wrap

Using onConsume

This component supports executing statements after data have been consumed and processed by Apache Camel. This allows you to do post updates in the database. Notice all statements must be UPDATE statements. Apache Camel supports executing multiple statements whose name should be separated by comma.
The route below illustrates we execute the consumeAccount statement data is processed. This allows us to change the status of the row in the database to processed, so we avoid consuming it twice or more.
from("ibatis:selectUnprocessedAccounts?consumer.onConsume=consumeAccount").to("mock:results");
Copy to Clipboard Toggle word wrap
And the statements in the sqlmap file:
<select id="selectUnprocessedAccounts" resultMap="AccountResult">
     select * from ACCOUNT where PROCESSED = false
</select>
Copy to Clipboard Toggle word wrap
<update id="consumeAccount" parameterClass="Account">
     update ACCOUNT set PROCESSED = true where ACC_ID = #id#
</update>
Copy to Clipboard Toggle word wrap

Chapter 65. IRC

IRC Component

The irc component implements an IRC (Internet Relay Chat) transport.

URI format

irc:nick@host[:port]/#room[?options]
Copy to Clipboard Toggle word wrap
In Apache Camel 2.0, you can also use the following format:
irc:nick@host[:port]?channels=#channel1,#channel2,#channel3[?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?option=value&option=value&...

Options

Expand
Name Description Example Default Value
channels New in 2.0, comma separated list of IRC channels to join. channels=#channel1,#channel2 null
nickname The nickname used in chat. irc:MyNick@irc.server.org#channel or irc:irc.server.org#channel?nickname=MyUser null
username The IRC server user name. irc:MyUser@irc.server.org#channel or irc:irc.server.org#channel?username=MyUser Same as nickname.
password The IRC server password. password=somepass None
realname The IRC user's actual name. realname=MyName None
colors Whether or not the server supports color codes. true, false true
onReply Whether or not to handle general responses to commands or informational messages. true, false false
onNick Handle nickname change events. true, false true
onQuit Handle user quit events. true, false true
onJoin Handle user join events. true, false true
onKick Handle kick events. true, false true
onMode Handle mode change events. true, false true
onPart Handle user part events. true, false true
onTopic Handle topic change events. true, false true
onPrivmsg Handle message events. true, false true
trustManager New in 2.0, the trust manager used to verify the SSL server's certificate. trustManager=#referenceToTrustManagerBean The default trust manager, which accepts all certificates, will be used.
keys Camel 2.2: Comma separated list of IRC channel keys. Important to be listed in same order as channels. When joining multiple channels with only some needing keys just insert an empty value for that channel. irc:MyNick@irc.server.org/#channel?keys=chankey null
sslContextParameters *Camel 2.9:* Reference to a org.apache.camel.util.jsse.SSLContextParameters in the Registry. This reference overrides any configured SSLContextParameters at the component level. See Using the JSSE Configuration Utility. Note that this setting overrides the trustManager option. \#mySslContextParameters null

Using the JSSE Configuration Utility

As of Camel 2.9, the IRC component supports SSL/TLS configuration through the Camel JSSE Configuration Utility. This utility greatly decreases the amount of component specific code you need to write and is configurable at the endpoint and component levels. The following examples demonstrate how to use the utility with the IRC component.

Programmatic configuration of the endpoint

KeyStoreParameters ksp = new KeyStoreParameters();
ksp.setResource("/users/home/server/truststore.jks");
ksp.setPassword("keystorePassword");

TrustManagersParameters tmp = new TrustManagersParameters();
tmp.setKeyStore(ksp);

SSLContextParameters scp = new SSLContextParameters();
scp.setTrustManagers(tmp);

Registry registry = ...
registry.bind("sslContextParameters", scp);

...

from(...)
    .to("ircs://camel-prd-user@server:6669/#camel-test?nickname=camel-prd&password=password&sslContextParameters=#sslContextParameters");
Copy to Clipboard Toggle word wrap

Spring DSL based configuration of endpoint

...
  <camel:sslContextParameters
      id="sslContextParameters">
    <camel:trustManagers>
      <camel:keyStore
          resource="/users/home/server/truststore.jks"
          password="keystorePassword"/>
    </camel:keyManagers>
  </camel:sslContextParameters>...
...
  <to uri="ircs://camel-prd-user@server:6669/#camel-test?nickname=camel-prd&password=password&sslContextParameters=#sslContextParameters"/>...
Copy to Clipboard Toggle word wrap

Using the legacy basic configuration options

You can also connect to an SSL enabled IRC server, as follows:
ircs:host[:port]/#room?username=user&password=pass
Copy to Clipboard Toggle word wrap
By default, the IRC transport uses SSLDefaultTrustManager. If you need to provide your own custom trust manager, use the trustManager parameter as follows:
ircs:host[:port]/#room?username=user&password=pass&trustManager=#referenceToMyTrustManagerBean
Copy to Clipboard Toggle word wrap

Using keys

Available as of Camel 2.2 Some irc rooms requires you to provide a key to be able to join that channel. The key is just a secret word.
For example we join 3 channels where as only channel 1 and 3 uses a key.
irc:nick@irc.server.org?channels=#chan1,#chan2,#chan3&keys=chan1Key,,chan3key

Copy to Clipboard Toggle word wrap

Chapter 66. Jasypt

Jasypt component

Available as of Camel 2.5
Jasypt is a simplified encryption library which makes encryption and decryption easy. Camel integrates with Jasypt to allow sensitive information in Properties files to be encrypted. By dropping camel-jasypt on the classpath those encrypted values will automatic be decrypted on-the-fly by Camel. This ensures that human eyes can't easily spot sensitive information such as usernames and passwords.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-jasypt</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

Tooling

The Jasypt component provides a little command line tooling to encrypt or decrypt values.
The console output the syntax and which options it provides:
Apache Camel Jasypt takes the following options

  -h or -help = Displays the help screen
  -c or -command <command> = Command either encrypt or decrypt
  -p or -password <password> = Password to use
  -i or -input <input> = Text to encrypt or decrypt
  -a or -algorithm <algorithm> = Optional algorithm to use
Copy to Clipboard Toggle word wrap
For example to encrypt the value tiger you run with the following parameters. In the apache camel kit, you cd into the lib folder and run the following java cmd, where <CAMEL_HOME> is where you have downloaded and extract the Camel distribution.
$ cd <CAMEL_HOME>/lib
$ java -jar camel-jasypt-2.5.0.jar -c encrypt -p secret -i tiger
Copy to Clipboard Toggle word wrap
Which outputs the following result
Encrypted text: qaEEacuW7BUti8LcMgyjKw==
Copy to Clipboard Toggle word wrap
This means the encrypted representation qaEEacuW7BUti8LcMgyjKw== can be decrypted back to tiger if you know the master password which was secret. If you run the tool again then the encrypted value will return a different result. But decrypting the value will always return the correct original value.
So you can test it by running the tooling using the following parameters:
$ cd <CAMEL_HOME>/lib
$ java -jar camel-jasypt-2.5.0.jar -c decrypt -p secret -i qaEEacuW7BUti8LcMgyjKw==
Copy to Clipboard Toggle word wrap
Which outputs the following result:
Decrypted text: tiger
Copy to Clipboard Toggle word wrap
The idea is then to use those encrypted values in your Properties files. Notice how the password value is encrypted and the value has the tokens surrounding ENC(value here)
# refer to a mock endpoint name by that encrypted password
cool.result=mock:{{cool.password}}

# here is a password which is encrypted
cool.password=ENC(bsW9uV37gQ0QHFu7KO03Ww==)
Copy to Clipboard Toggle word wrap

Tooling dependencies for Camel 2.5 and 2.6

The tooling requires the following JARs in the classpath, which has been enlisted in the MANIFEST.MF file of camel-jasypt with optional/ as prefix. Hence why the java cmd above can pickup the needed JARs from the Apache Distribution in the optional directory.
jasypt-1.6.jar commons-lang-2.4.jar commons-codec-1.4.jar icu4j-4.0.1.jar
Copy to Clipboard Toggle word wrap
Java 1.5 users
The icu4j-4.0.1.jar is only needed when running on JDK 1.5.
This JAR is not distributed by Apache Camel and you have to download it manually and copy it to the lib/optional directory of the Camel distribution. You can download it from Apache Central Maven repo.

Tooling dependencies for Camel 2.7 or better

Jasypt 1.7 onwards is now fully standalone, so no additional JARs are needed.

URI Options

The options below are exclusive for the Jasypt component.
Expand
Name Default Value Type Description
password null String Specifies the master password to use for decrypting. This option is mandatory. See below for more details.
algorithm null String Name of an optional algorithm to use.

Protecting the master password

The master password used by Jasypt must be provided, so its capable of decrypting the values. However having this master password out in the opening may not be an ideal solution. Therefore you could for example provided it as a JVM system property or as a OS environment setting. If you decide to do so then the password option supports prefixes which dictates this. sysenv: means to lookup the OS system environment with the given key. sys: means to lookup a JVM system property.
For example you could provided the password before you start the application
$ export CAMEL_ENCRYPTION_PASSWORD=secret
Copy to Clipboard Toggle word wrap
Then start the application, such as running the start script.
When the application is up and running you can unset the environment
$ unset CAMEL_ENCRYPTION_PASSWORD
Copy to Clipboard Toggle word wrap
The password option is then a matter of defining as follows: password=sysenv:CAMEL_ENCRYPTION_PASSWORD.

Example with Java DSL

In Java DSL you need to configure Jasypt as a JasyptPropertiesParser instance and set it on the Properties component as show below:
// create the jasypt properties parser
JasyptPropertiesParser jasypt = new JasyptPropertiesParser();
// and set the master password
jasypt.setPassword("secret");

// create the properties component
PropertiesComponent pc = new PropertiesComponent();
pc.setLocation("classpath:org/apache/camel/component/jasypt/myproperties.properties");
// and use the jasypt properties parser so we can decrypt values
pc.setPropertiesParser(jasypt);

// add properties component to camel context
context.addComponent("properties", pc);
Copy to Clipboard Toggle word wrap
The properties file myproperties.properties then contain the encrypted value, such as shown below. Notice how the password value is encrypted and the value has the tokens surrounding ENC(value here)
# refer to a mock endpoint name by that encrypted password
cool.result=mock:{{cool.password}}

# here is a password which is encrypted
cool.password=ENC(bsW9uV37gQ0QHFu7KO03Ww==)
Copy to Clipboard Toggle word wrap

Example with Spring XML

In Spring XML you need to configure the JasyptPropertiesParser which is shown below. Then the Camel Properties component is told to use jasypt as the properties parser, which means Jasypt have its chance to decrypt values looked up in the properties.
<!-- define the jasypt properties parser with the given password to be used -->
<bean id="jasypt" class="org.apache.camel.component.jasypt.JasyptPropertiesParser">
    <property name="password" value="secret"/>
</bean>

<!-- define the camel properties component -->
<bean id="properties" class="org.apache.camel.component.properties.PropertiesComponent">
    <!-- the properties file is in the classpath -->
    <property name="location" value="classpath:org/apache/camel/component/jasypt/myproperties.properties"/>
    <!-- and let it leverage the jasypt parser -->
    <property name="propertiesParser" ref="jasypt"/>
</bean>
Copy to Clipboard Toggle word wrap
The Properties component can also be inlined inside the <camelContext> tag which is shown below. Notice how we use the propertiesParserRef attribute to refer to Jasypt.
<!-- define the jasypt properties parser with the given password to be used -->
<bean id="jasypt" class="org.apache.camel.component.jasypt.JasyptPropertiesParser">
    <!-- password is mandatory, you can prefix it with sysenv: or sys: to indicate it should use
         an OS environment or JVM system property value, so you dont have the master password defined here -->
    <property name="password" value="secret"/>
</bean>

<camelContext xmlns="http://camel.apache.org/schema/spring">
    <!-- define the camel properties placeholder, and let it leverage jasypt -->
    <propertyPlaceholder id="properties"
                         location="classpath:org/apache/camel/component/jasypt/myproperties.properties"
                         propertiesParserRef="jasypt"/>
    <route>
        <from uri="direct:start"/>
        <to uri="{{cool.result}}"/>
    </route>
</camelContext>
Copy to Clipboard Toggle word wrap

See Also

Chapter 67. jclouds

Jclouds Component

Available as of Camel 2.9
This component allows interaction with cloud provider key-value engines (blobstores) and compute services. The component uses jclouds which is a library that provides abstractions for blobstores and compute services.
ComputeService simplifies the task of managing machines in the cloud. For example, you can use ComputeService to start 5 machines and install your software on them. BlobStore simplifies dealing with key-value providers such as Amazon S3. For example, BlobStore can give you a simple Map view of a container.
The camel jclouds component allows you to use both abstractions, as it specifes two types of endpoint the JcloudsBlobStoreEndpoint and the JcloudsComputeEndpoint. You can have both producers and consumers on a blobstore endpoint but you can only have producers on compute endpoints.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-jclouds</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

Configuring the component

The camel jclouds component will make use of multiple jclouds blobstores and compute services as long as they are passed to the component during initialization. The component accepts a list blobstores and compute services. Here is how it can be configured.
    <bean id="jclouds" class="org.apache.camel.component.jclouds.JcloudsComponent">
        <property name="computeServices">
            <list>
                <ref bean="computeService"/>
            </list>
        </property>
        <property name="blobStores">
            <list>
                <ref bean="blobStore"/>
            </list>
        </property>
    </bean>

    <!-- Creating a blobstore from spring / blueprint xml -->
    <bean id="blobStoreContextFactory" class="org.jclouds.blobstore.BlobStoreContextFactory"/>

    <bean id="blobStoreContext" factory-bean="blobStoreContextFactory" factory-method="createContext">
        <constructor-arg name="provider" value="PROVIDER_NAME"/>
        <constructor-arg name="identity"  value="IDENTITY"/>
        <constructor-arg name="credential" value="CREDENTIAL"/>
    </bean>

    <bean id="blobStore" factory-bean="blobStoreContext" factory-method="getBlobStore"/>

    <!-- Creating a compute service from spring / blueprint xml -->
    <bean id="computeServiceContextFactory" class="org.jclouds.compute.ComputeServiceContextFactory"/>

    <bean id="computeServiceContext" factory-bean="computeServiceContextFactory" factory-method="createContext">
        <constructor-arg name="provider" value="PROVIDER_NAME"/>
        <constructor-arg name="identity"  value="IDENTITY"/>
        <constructor-arg name="credential" value="CREDENTIAL"/>
    </bean>

    <bean id="computeService" factory-bean="computeServiceContext" factory-method="getComputeService"/>
Copy to Clipboard Toggle word wrap
As you can see the component is capable of handling multiple blobstores and compute services. The actual implementation that will be used by each endpoint is specified by passing the provider inside the URI.

URI format

jclouds:blobstore:[provider id][?options]
jclouds:compute:[provider id][?options]
Copy to Clipboard Toggle word wrap
The provider id is the name of the cloud provider that provides the target service (e.g. aws-s3 or aws_ec2).
You can append query options to the URI in the following format, ?option=value&option=value&...

Blobstore URI Options

Expand
Name Default Value Description
operation PUT *Producer Only*. Specifies the type of operation that will be performed to the blobstore. Allowed values are PUT, GET.
container null The name of the blob container.
blobName null The name of the blob.
You can have as many of these options as you like.
jclouds:blobstore:aws-s3?operation=CamelJcloudsGet&container=mycontainer&blobName=someblob
Copy to Clipboard Toggle word wrap
For producer endpoint you can override all of the above URI options by passing the appropriate headers to the message.

Message Headers for blobstore

Expand
Header Description
CamelJcloudsOperation
The operation to be performed on the blob. The valid options are
  • PUT
  • GET
CamelJcloudsContainer The name of the blob container.
CamelJcloudsBlobName The name of the blob.

Blobstore Usage Samples

Example 1: Putting to the blob

This example will show you how you can store any message inside a blob using the jclouds component.
from("direct:start")
    .to("jclouds:blobstore:aws-s3" +
        "?operation=PUT" +
        "&container=mycontainer" +
        "&blobName=myblob");
Copy to Clipboard Toggle word wrap
In the above example you can override any of the URI parameters with headers on the message. Here is how the above example would look like using xml to define our route.
<route>
    <from uri="direct:start"/>
    <to uri="jclouds:blobstore:aws-s3?operation=PUT&container=mycontainer&blobName=myblob"/>
</route>
Copy to Clipboard Toggle word wrap

Example 2: Getting/Reading from a blob

This example will show you how you can read the contnet of a blob using the jclouds component.
from("direct:start")
    .to("jclouds:blobstore:aws-s3" +
        "?operation=GET" +
        "&container=mycontainer" +
        "&blobName=myblob");
Copy to Clipboard Toggle word wrap
In the above example you can override any of the URI parameters with headers on the message. Here is how the above example would look like using xml to define our route.
<route>
    <from uri="direct:start"/>
    <to uri="jclouds:blobstore:aws-s3?operation=PUT&container=mycontainer&blobName=myblob"/>
</route>
Copy to Clipboard Toggle word wrap

Example 3: Consuming a blob

This example will consume all blob that are under the specified container. The generated exchange will contain the payload of the blob as body.
    from("jclouds:blobstore:aws-s3" +
        "?container=mycontainer")
        .to("direct:next");
Copy to Clipboard Toggle word wrap
You can achieve the same goal by using xml, as you can see below.
<route>
    <from uri="jclouds:blobstore:aws-s3?operation=GET&container=mycontainer&blobName=myblob"/>
    <to uri="direct:next"/>
</route>
Copy to Clipboard Toggle word wrap

Compute Service URI Options

Expand
Name Default Value Description
operation CamelJcloudsPut Specifies the type of operation that will be performed to the compute service. Allowed values are CamelJcloudsCreateNode, CamelJcloudsRunScript, CamelJcloudsDestroyNode, CamelJcloudsListNodes, CamelJCloudsListImages, CamelJCloudsListHardware.
imageId null *CamelJcloudsCreateNode operation only* The imageId that will be used for creating a node. Values depend on the actual cloud provider.
locationId null *CamelJcloudsCreateNode operation only* The location that will be used for creating a node. Values depend on the actual cloud provider.
hardwareId null *CamelJcloudsCreateNode operation only* The hardware that will be used for creating a node. Values depend on the actual cloud provider.
group null *CamelJcloudsCreateNode operation only* The group that will be assigned to the newly created node. Values depend on the actual cloud provider.
nodeId null *CamelJcloudsRunScript & CamelJcloudsDestroyNode operation only* The id of the node that will run the script or destroyed.
user null *CamelJcloudsRunScript operation only* The user on the target node that will run the script.
The combination of parameters for use with the compute service depend on the operation.
jclouds:compute:aws-ec2?operation=CamelJcloudsCreateNode&imageId=AMI_XXXXX&locationId=eu-west-1&group=mygroup
Copy to Clipboard Toggle word wrap

Compute Usage Samples

Below are some examples that demonstrate the use of jclouds compute producer in java dsl and spring/blueprint xml.

Example 1: Listing the available images.

    from("jclouds:compute:aws-ec2" +
        "&operation=CamelJCloudsListImages")
        .to("direct:next");
Copy to Clipboard Toggle word wrap
This will create a message that will contain the list of images inside its body. You can also do the same using xml.
<route>
    <from uri="jclouds:compute:aws-ec2?operation=CamelJCloudsListImages"/>
    <to uri="direct:next"/>
</route>
Copy to Clipboard Toggle word wrap

Example 2: Create a new node.

    from("direct:start").
    to("jclouds:compute:aws-ec2" +
        "?operation=CamelJcloudsCreateNode" +
        "&imageId=AMI_XXXXX" +
        "&locationId=XXXXX" +
        "&group=myGroup");
Copy to Clipboard Toggle word wrap
This will create a new node on the cloud provider. The out message in this case will be a set of metadata that contains information about the newly created node (e.g. the ip, hostname etc). Here is the same using spring xml.
<route>
    <from uri="direct:start"/>
    <to uri="jclouds:compute:aws-ec2?operation=CamelJcloudsCreateNode&imageId=AMI_XXXXX&locationId=XXXXX&group=myGroup"/>
</route>
Copy to Clipboard Toggle word wrap

Example 3: Run a shell script on running node.

    from("direct:start").
    to("jclouds:compute:aws-ec2" +
        "?operation=CamelJcloudsRunScript" +
        "?nodeId=10" +
        "&user=ubuntu");
Copy to Clipboard Toggle word wrap
The sample above will retrieve the body of the in message, which is expected to contain the shell script to be executed. Once the script is retrieved, it will be sent to the node for execution under the specified user (in order case ubuntu). The target node is specified using its nodeId. The nodeId can be retrieved either upon the creation of the node, it will be part of the resulting metadata or by a executing a CamelJcloudsListNodes operation.
Note This will require that the compute service that will be passed to the component, to be initialized with the appropriate JClouds SSH capable module (e.g. jsch or sshj).
Here is the same using spring xml.
<route>
    <from uri="direct:start"/>
    <to uri="jclouds:compute:aws-ec2?operation=CamelJcloudsRunScript&?nodeId=10&user=ubuntu"/>
</route>
Copy to Clipboard Toggle word wrap

See also

If you want to find out more about jclouds here is list of interesting resources Jclouds BlobStore Guide Jclouds Compute Guide

Chapter 68. JCR

JCR Component

The jcr component allows you to add/read nodes to/from a JCR compliant content repository (for example, Apache Jackrabbit) with its producer, or register an EventListener with the consumer.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-jcr</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

jcr://user:password@repository/path/to/node
Copy to Clipboard Toggle word wrap
Consumer added
From Camel 2.10 onwards you can use consumer as an EventListener in JCR or a producer to read a node by identifier.

Usage

The repository element of the URI is used to look up the JCR Repository object in the Camel context registry.

Producer

Expand
Name Default Value Description
CamelJcrOperation CamelJcrInsert CamelJcrInsert or CamelJcrGetById operation to use
CamelJcrNodeName null Used to determine the node name to use.
When a message is sent to a JCR producer endpoint:
  • If the operation is CamelJcrInsert: A new node is created in the content repository, all the message headers of the IN message are transformed to javax.jcr.Value instances and added to the new node and the node's UUID is returned in the OUT message.
  • If the operation is CamelJcrGetById: A new node is retrieved from the repository using the message body as node identifier.
Note
Please note that the JCR Producer used message properties instead of message headers in Camel versions earlier than 2.12.3.

Consumer

The consumer will connect to JCR periodically and return a List<javax.jcr.observation.Event> in the message body.
Expand
Name Default Value Description
eventTypes 0 A combination of one or more event types encoded as a bit mask value such as javax.jcr.observation.Event.NODE_ADDED, javax.jcr.observation.Event.NODE_REMOVED, etc.
deep false When it is true, events whose associated parent node is at current path or within its subgraph are received.
uuids null Only events whose associated parent node has one of the identifiers in the comma separated uuid list will be received.
nodeTypeNames null Only events whose associated parent node has one of the node types (or a subtype of one of the node types) in this list will be received.
noLocal false If noLocal is true, then events generated by the session through which the listener was registered are ignored. Otherwise, they are not ignored.
sessionLiveCheckInterval 60000 Interval in milliseconds to wait before each session live checking.
sessionLiveCheckIntervalOnStart 3000 Interval in milliseconds to wait before the first session live checking.
username Camel 2.15: Allows to specify the username as a uri parameter instead of in the authority section of the uri
password Camel 2.15: Allows to specify the password as a uri parameter instead of in the authority section of the uri

Example

The snippet below creates a node named node under the /home/test node in the content repository. One additional property is added to the node as well: my.contents.property which will contain the body of the message being sent.
from("direct:a").setHeader(JcrConstants.JCR_NODE_NAME, constant("node"))
    .setHeader("my.contents.property", body())
    .to("jcr://user:pass@repository/home/test");
Copy to Clipboard Toggle word wrap
The following code will register an EventListener under the path import-application/inbox for Event.NODE_ADDED and Event.NODE_REMOVED events (event types 1 and 2, both masked as 3) and listening deep for all the children.
<route>
    <from uri="jcr://user:pass@repository/import-application/inbox?eventTypes=3&deep=true" />
    <to uri="direct:execute-import-application" />
</route>
Copy to Clipboard Toggle word wrap

Chapter 69. JDBC

JDBC Component

The JDBC component enables you to access databases through JDBC, where SQL queries (SELECT) and operations (INSERT, UPDATE, and so on) are sent in the message body. This component uses the standard JDBC API, unlike the SQL Component component, which uses spring-jdbc.
Warning
This component can only be used to define producer endpoints, which means that you cannot use the JDBC component in a from() statement.

URI format

jdbc:dataSourceName[?options]
Copy to Clipboard Toggle word wrap
This component only supports producer endpoints.
You can append query options to the URI in the following format, ?option=value&option=value&...

Options

Expand
Name Default Value Description
readSize 0 The default maximum number of rows that can be read by a polling query.
statement.<xxx> null Apache Camel 2.1: Sets additional options on the java.sql.Statement that is used behind the scenes to execute the queries. For instance, statement.maxRows=10. For detailed documentation, see the java.sql.Statement javadoc documentation.
useJDBC4ColumnNameAndLabelSemantics true Sets whether to use JDBC 4/3 column label/name semantics. You can use this option to turn it false in case you have issues with your JDBC driver to select data. This only applies when using SQL SELECT using aliases (e.g. SQL SELECT id as identifier, name as given_name from persons).
resetAutoCommit true Camel 2.9: Camel will set the autoCommit on the JDBC connection to be false, commit the change after executed the statement and reset the autoCommit flag of the connection at the end, if the resetAutoCommit is true. If the JDBC connection doesn't support to reset the autoCommit flag, you can set the resetAutoCommit flag to be false, and Camel will not try to reset the autoCommit flag. When used with XA transactions you most likely need to set it to false so that the transaction manager is in charge of committing this tx.
allowNamedParameters true Camel 2.12: Whether to allow using named parameters in the queries.
prepareStatementStrategy Camel 2.12: Allows to plugin to use a custom org.apache.camel.component.jdbc.JdbcPrepareStatementStrategy to control preparation of the query and prepared statement.
useHeadersAsParameters false Camel 2.12: Set this option to true to use the prepareStatementStrategy with named parameters. This allows to define queries with named placeholders, and use headers with the dynamic values for the query placeholders.
outputType SelectList
Camel 2.12.1: Make the output of the producer to SelectList as List of Map, or SelectOne as single Java object in the following way: a) If the query has only single column, then that JDBC Column object is returned. (such as SELECT COUNT( * ) FROM PROJECT will return a Long object. b) If the query has more than one column, then it will return a Map of that result. c) If the outputClass is set, then it will convert the query result into an Java bean object by calling all the setters that match the column names. It will assume your class has a default constructor to create instance with. From Camel 2.14 onwards, SelectList is also supported. d) If the query resulted in more than one rows, it throws an non-unique result exception.
Camel 2.14.0: New StreamList output type value that streams the result of the query using an Iterator<Map<String, Object>>, it can be used along with the Splitter EIP.
outputClass null Camel 2.12.1: Specify the full package and class name to use as conversion when outputType=SelectOne. From Camel 2.14 onwards then SelectList is also supported.
beanRowMapper Camel 2.12.1: To use a custom org.apache.camel.component.jdbc.BeanRowMapper when using outputClass. The default implementation will lower case the row names and skip underscores, and dashes. For example "CUST_ID" is mapped as "custId".

Result

By default, the result is returned in the OUT body as an ArrayList<HashMap<String, Object>>. The List object contains the list of rows and the Map objects contain each row with the String key as the column name.
Note
This component fetches ResultSetMetaData to be able to return the column name as the key in the Map.

Message Headers

Expand
Header Description
CamelJdbcRowCount If the query is a SELECT, the row count is returned in this OUT header.
CamelJdbcUpdateCount If the query is an UPDATE, the update count is returned in this OUT header.
CamelGeneratedKeysRows Camel 2.10: Rows that contains the generated kets.
CamelGeneratedKeysRowCount Camel 2.10: The number of rows in the header that contains generated keys.
CamelJdbcColumnNames Camel 2.11.1: The column names from the ResultSet as a java.util.Set type.
CamelJdbcParametes Camel 2.12: A java.util.Map which has the headers to be used if useHeadersAsParameters has been enabled.

Generated keys

Available as of Camel 2.10
If you insert data using SQL INSERT, then the RDBMS may support auto generated keys. You can instruct the JDBC producer to return the generated keys in headers. To do that set the header CamelRetrieveGeneratedKeys=true. Then the generated keys will be provided as headers with the keys listed in the table above.
You can see more details in this unit test.
Important
Using generated keys does not work with together with named parameters.

Using named parameters

Available as of Camel 2.12
In the given route below, we want to get all the projects from the projects table. Notice the SQL query has 2 named parameters, :?lic and :?min. Camel will then lookup these parameters from the message headers. Notice in the example above we set two headers with constant value for the named parameters:
  from("direct:projects")
     .setHeader("lic", constant("ASF"))
     .setHeader("min", constant(123))
     .setBody("select * from projects where license = :?lic and id > :?min order by id")
     .to("jdbc:myDataSource?useHeadersAsParameters=true")
Copy to Clipboard Toggle word wrap
You can also store the header values in a java.util.Map and store the map on the headers with the key CamelJdbcParameters.

Samples

In the following example, we fetch the rows from the customer table.
First we register our datasource in the Apache Camel registry as testdb:
JndiRegistry reg = super.createRegistry();
reg.bind("testdb", db);
return reg;
Copy to Clipboard Toggle word wrap
Then we configure a route that routes to the JDBC component, so the SQL will be executed. Note how we refer to the testdb datasource that was bound in the previous step:
// lets add simple route
public void configure() throws Exception {
    from("direct:hello").to("jdbc:testdb?readSize=100");
}
Copy to Clipboard Toggle word wrap
Or you can create a DataSource in Spring like this:
<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
  <route>
	 <!-- trigger every second -->
     <from uri="timer://kickoff?period=1s"/>
     <setBody>
       <constant>select * from customer</constant>
     </setBody>
     <to uri="jdbc:testdb"/>
     <to uri="mock:result"/>
  </route>
</camelContext>
<!-- Just add a demo to show how to bind a date source for camel in Spring-->
<jdbc:embedded-database id="testdb" type="DERBY">
	<jdbc:script location="classpath:sql/init.sql"/>
</jdbc:embedded-database>
Copy to Clipboard Toggle word wrap
We create an endpoint, add the SQL query to the body of the IN message, and then send the exchange. The result of the query is returned in the OUT body:
// first we create our exchange using the endpoint
Endpoint endpoint = context.getEndpoint("direct:hello");
Exchange exchange = endpoint.createExchange();
// then we set the SQL on the in body
exchange.getIn().setBody("select * from customer order by ID");

// now we send the exchange to the endpoint, and receives the response from Camel
Exchange out = template.send(endpoint, exchange);

// assertions of the response
assertNotNull(out);
assertNotNull(out.getOut());
List<Map<String, Object>> data = out.getOut().getBody(List.class);
assertNotNull(data);
assertEquals(3, data.size());
Map<String, Object> row = data.get(0);
assertEquals("cust1", row.get("ID"));
assertEquals("jstrachan", row.get("NAME"));
row = data.get(1);
assertEquals("cust2", row.get("ID"));
assertEquals("nsandhu", row.get("NAME"));
Copy to Clipboard Toggle word wrap
If you want to work on the rows one by one instead of the entire ResultSet at once you need to use the Splitter EIP such as:
from("direct:hello")
// here we split the data from the testdb into new messages one by one
// so the mock endpoint will receive a message per row in the table
// the StreamList option allows to stream the result of the query without creating a List of rows
// and notice we also enable streaming mode on the splitter
.to("jdbc:testdb?outputType=StreamList")
  .split(body()).streaming()
  .to("mock:result");
Copy to Clipboard Toggle word wrap

Sample - Polling the database every minute

If we want to poll a database using the JDBC component, we need to combine it with a polling scheduler such as the Timer or Quartz etc. In the following example, we retrieve data from the database every 60 seconds:
from("timer://foo?period=60000").setBody(constant("select * from customer")).to("jdbc:testdb").to("activemq:queue:customers");
Copy to Clipboard Toggle word wrap

Sample - Move Data Between Data Sources

A common use case is to query for data, process it and move it to another data source (ETL operations). In the following example, we retrieve new customer records from the source table every hour, filter/transform them and move them to a destination table:
from("timer://MoveNewCustomersEveryHour?period=3600000")
    .setBody(constant("select * from customer where create_time > (sysdate-1/24)"))
    .to("jdbc:testdb")
    .split(body())
		.process(new MyCustomerProcessor()) //filter/transform results as needed
        .setBody(simple("insert into processed_customer values('${body[ID]}','${body[NAME]}')"))
        .to("jdbc:testdb");
Copy to Clipboard Toggle word wrap

See also

Chapter 70. Jetty

Jetty Component

The jetty component provides HTTP-based endpoints for consuming and producing HTTP requests. That is, the Jetty component behaves as a simple Web server. Jetty can also be used as a http client which mean you can also use it with Camel as a producer.
Stream
Jetty is stream based, which means the input it receives is submitted to Camel as a stream. That means you will only be able to read the content of the stream once. If you find a situation where the message body appears to be empty or you need to access the Exchange.HTTP_RESPONSE_CODE data multiple times (eg: doing multicasting, or redelivery error handling) you should use Stream Caching or convert the message body to a String which is safe to be re-read multiple times.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-jetty</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

jetty:http://hostname[:port][/resourceUri][?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?option=value&option=value&...

Options

Expand
Name Default Value Description
sessionSupport false Specifies whether to enable the session manager on the server side of Jetty.
httpClient.XXX null Configuration of Jetty's HttpClient. For example, setting httpClient.idleTimeout=30000 sets the idle timeout to 30 seconds.
httpClient null To use a shared org.eclipse.jetty.client.HttpClient for all producers created by this endpoint. This option should only be used in special circumstances.
httpClientMinThreads null Camel 2.11:Producer only: To set a value for minimum number of threads in HttpClient thread pool. This setting override any setting configured on component level. Notice that both a min and max size must be configured. If not set it default to min 8 threads used in Jetty's thread pool.
httpClientMaxThreads null Camel 2.11:Producer only: To set a value for maximum number of threads in HttpClient thread pool. This setting override any setting configured on component level. Notice that both a min and max size must be configured. If not set it default to min 8 threads used in Jetty's thread pool.
httpBindingRef null Reference to an org.apache.camel.component.http.HttpBinding in the Registry. HttpBinding can be used to customize how a response should be written for the consumer.
jettyHttpBindingRef null Camel 2.6.0+: Reference to an org.apache.camel.component.jetty.JettyHttpBinding in the Registry. JettyHttpBinding can be used to customize how a response should be written for the producer.
matchOnUriPrefix false Whether or not the CamelServlet should try to find a target consumer by matching the URI prefix if no exact match is found. See here How do I let Jetty match wildcards.
handlers null Specifies a comma-delimited set of org.mortbay.jetty.Handler instances in your Registry (such as your Spring ApplicationContext). These handlers are added to the Jetty servlet context (for example, to add security).
chunked true Camel 2.2: If this option is false Jetty servlet will disable the HTTP streaming and set the content-length header on the response
enableJmx false Camel 2.3: If this option is true, Jetty JMX support will be enabled for this endpoint. See Jetty JMX support for more details.
disableStreamCache false Camel 2.3: Determines whether or not the raw input stream from Jetty is cached or not (Camel will read the stream into a in memory/overflow to file, Stream caching) cache. By default Camel will cache the Jetty input stream to support reading it multiple times to ensure it Camel can retrieve all data from the stream. However you can set this option to true when you for example need to access the raw stream, such as streaming it directly to a file or other persistent store. DefaultHttpBinding will copy the request input stream into a stream cache and put it into message body if this option is false to support reading the stream multiple times. If you use Jetty to bridge/proxy an endpoint then consider enabling this option to improve performance, in case you do not need to read the message payload multiple times.
throwExceptionOnFailure true Option to disable throwing the HttpOperationFailedException in case of failed responses from the remote server. This allows you to get all responses regardles of the HTTP status code.
transferException false Camel 2.6: If enabled and an Exchange failed processing on the consumer side, and if the caused Exception was send back serialized in the response as a application/x-java-serialized-object content type. On the producer side the exception will be deserialized and thrown as is, instead of the HttpOperationFailedException. The caused exception is required to be serialized.
bridgeEndpoint false
>Camel 2.1: If the option is true , HttpProducer will ignore the Exchange.HTTP_URI header, and use the endpoint's URI for request. You may also set the throwExceptionOnFailure to be false to let the HttpProducer send all the fault response back. Camel 2.3: If the option is true, HttpProducer and CamelServlet will skip the gzip processing if the content-encoding is "gzip". Also consider setting disableStreamCache to true to optimize when bridging.
enableMultipartFilter true Camel 2.5: Whether Jetty org.eclipse.jetty.servlets.MultiPartFilter is enabled or not. You should set this value to false when bridging endpoints, to ensure multipart requests is proxied/bridged as well.
multipartFilterRef null Camel 2.6: Allows using a custom multipart filter. Note: setting multipartFilterRef forces the value of enableMultipartFilter to true.
FiltersRef null Camel 2.9: Allows using a custom filters which is putted into a list and can be find in the Registry
continuationTimeout null Camel 2.6: Allows to set a timeout in millis when using Jetty as consumer (server). By default Jetty uses 30000. You can use a value of <= 0 to never expire. If a timeout occurs then the request will be expired and Jetty will return back a http error 503 to the client. This option is only in use when using Jetty with the Asynchronous Routing Engine.
useContinuation true Camel 2.6: Whether or not to use Jetty continuations for the Jetty Server.
sslContextParametersRef null Camel 2.8: Reference to a org.apache.camel.util.jsse.SSLContextParameters in the CAMEL:Registry. This reference overrides any configured SSLContextParameters at the component level. See Using the JSSE Configuration Utility.
traceEnabled false Specifies whether to enable HTTP TRACE for this Jetty consumer. By default TRACE is turned off.
headerFilterStrategy null Camel 2.11: Reference to a instance of org.apache.camel.spi.HeaderFilterStrategy in the Registry. It will be used to apply the custom headerFilterStrategy on the new create HttpJettyEndpoint.
httpMethodRestrict
null
Camel 2.11: Consumer only: Used to only allow consuming if the HttpMethod matches, such as GET/POST/PUT etc. From Camel 2.15 onwards multiple methods can be specified separated by comma.
urlRewrite null Camel 2.11:Producer only Refers to a custom org.apache.camel.component.http.UrlRewrite which allows you to rewrite urls when you bridge/proxy endpoints. See more details at UrlRewrite and How to use Camel as a HTTP proxy between a client and server.
responseBufferSize null Camel 2.12: To use a custom buffer size on the javax.servlet.ServletResponse.
proxyHost
null
Camel 2.11: Producer only The http proxy Host url which will be used by Jetty client.
proxyPort
null
Camel 2.11: Producer only The http proxy port which will be used by Jetty client.
sendServerVersion
true
Camel 2.13: if the option is true, jetty will send the server header with the jetty version information to the client which sends the request. NOTE please make sure there is no any other camel-jetty endpoint is share the same port, otherwise this option may not work as expected.
sendDateHeader
false
Camel 2.14: if the option is true, jetty server will send the date header to the client which sends the request. NOTE please make sure there is no any other camel-jetty endpoint is share the same port, otherwise this option may not work as expected.
enableCORS
false
Camel 2.15: if the option is true, Jetty server will set up the CrossOriginFilter which supports the CORS out of box.

Message Headers

Camel uses the same message headers as the HTTP component. From Camel 2.2, it also uses (Exchange.HTTP_CHUNKED,CamelHttpChunked) header to turn on or turn off the chuched encoding on the camel-jetty consumer.
Camel also populates all request.parameter and request.headers. For example, given a client request with the URL, http://myserver/myserver?orderid=123, the exchange will contain a header named orderid with the value 123.
Starting with Camel 2.2.0, you can get the request.parameter from the message header not only from Get Method, but also other HTTP method.

Usage

The Jetty component supports both consumer and producer endpoints. Another option for producing to other HTTP endpoints, is to use the HTTP Component

Component Options

The JettyHttpComponent provides the following options:
Expand
Name Default Value Description
enableJmx false Camel 2.3: If this option is true, Jetty JMX support will be enabled for this endpoint. See Jetty JMX support for more details.
sslKeyPassword null Consumer only: The password for the keystore when using SSL.
sslPassword null Consumer only: The password when using SSL.
sslKeystore null Consumer only: The path to the keystore.
minThreads null Camel 2.5 Consumer only: To set a value for minimum number of threads in server thread pool.
maxThreads null Camel 2.5 Consumer only: To set a value for maximum number of threads in server thread pool.
threadPool null Camel 2.5 Consumer only: To use a custom thread pool for the server.
sslSocketConnectors null Camel 2.3 Consumer only: A map which contains per port number specific SSL connectors. See section SSL support for more details.
socketConnectors null Camel 2.5 Consumer only: A map which contains per port number specific HTTP connectors. Uses the same principle as sslSocketConnectors and therefore see section SSL support for more details.
sslSocketConnectorProperties null Camel 2.5 Consumer only. A map which contains general SSL connector properties. See section SSL support for more details.
socketConnectorProperties null Camel 2.5 Consumer only. A map which contains general HTTP connector properties. Uses the same principle as sslSocketConnectorProperties and therefore see section SSL support for more details.
httpClient null Deprecated:Producer only: To use a custom HttpClient with the jetty producer. This option is removed from Camel 2.11 onwards, instead you can set the option on the endpoint instead.
httpClientMinThreads null Producer only: To set a value for minimum number of threads in HttpClient thread pool. Notice that both a min and max size must be configured.
httpClientMaxThreads null Producer only: To set a value for maximum number of threads in HttpClient thread pool. Notice that both a min and max size must be configured.
httpClientThreadPool null Deprecated:Producer only: To use a custom thread pool for the client. This option is removed from Camel 2.11 onwards.
sslContextParameters null Camel 2.8: To configure a custom SSL/TLS configuration options at the component level. See Using the JSSE Configuration Utility for more details.
requestBufferSize null Camel 2.11.2: Allows to configure a custom value of the request buffer size on the Jetty connectors.
requestHeaderSize null Camel 2.11.2: Allows to configure a custom value of the request header size on the Jetty connectors.
responseBufferSize null Camel 2.11.2: Allows to configure a custom value of the response buffer size on the Jetty connectors.
responseHeaderSize null Camel 2.11.2: Allows to configure a custom value of the response header size on the Jetty connectors.
proxyHost
null
Camel 2.12.2/2.11.3 To use a http proxy.
proxyPort
null
Camel 2.12.2/2.11.3: To use a http proxy.
errorHandler
null
Camel 2.15: This option is used to set the ErrorHandler that Jetty server uses.

Producer Example

The following is a basic example of how to send an HTTP request to an existing HTTP endpoint.
in Java DSL
from("direct:start").to("jetty://http://www.google.com");
Copy to Clipboard Toggle word wrap
or in Spring XML
<route>
    <from uri="direct:start"/>
    <to uri="jetty://http://www.google.com"/>
<route>
Copy to Clipboard Toggle word wrap

Consumer Example

In this sample we define a route that exposes a HTTP service at http://localhost:8080/myapp/myservice:
from("jetty:http://localhost:{{port}}/myapp/myservice").process(new MyBookService());
Copy to Clipboard Toggle word wrap
Usage of localhost
When you specify localhost in a URL, Camel exposes the endpoint only on the local TCP/IP network interface, so it cannot be accessed from outside the machine it operates on.
If you need to expose a Jetty endpoint on a specific network interface, the numerical IP address of this interface should be used as the host. If you need to expose a Jetty endpoint on all network interfaces, the 0.0.0.0 address should be used.
Tip
To listen across an entire URI prefix, see How do I let Jetty match wildcards.
Tip
If you actually want to expose routes by HTTP and already have a Servlet, you should instead refer to the Servlet Transport.
Our business logic is implemented in the MyBookService class, which accesses the HTTP request contents and then returns a response. Note: The assert call appears in this example, because the code is part of an unit test.
public class MyBookService implements Processor {
    public void process(Exchange exchange) throws Exception {
        // just get the body as a string
        String body = exchange.getIn().getBody(String.class);

        // we have access to the HttpServletRequest here and we can grab it if we need it
        HttpServletRequest req = exchange.getIn().getBody(HttpServletRequest.class);
        assertNotNull(req);

        // for unit testing
        assertEquals("bookid=123", body);

        // send a html response
        exchange.getOut().setBody("<html><body>Book 123 is Camel in Action</body></html>");
    }
}
Copy to Clipboard Toggle word wrap
The following sample shows a content-based route that routes all requests containing the URI parameter, one, to the endpoint, mock:one, and all others to mock:other.
from("jetty:" + serverUri)
    .choice()
    .when().simple("${header.one}").to("mock:one")
    .otherwise()
    .to("mock:other");
Copy to Clipboard Toggle word wrap
So if a client sends the HTTP request, http://serverUri?one=hello, the Jetty component will copy the HTTP request parameter, one to the exchange's in.header. We can then use the simple language to route exchanges that contain this header to a specific endpoint and all others to another. If we used a language more powerful than Simple\-\--such as- El or OGNL\--we could also test for the parameter value and do routing based on the header value as well.

Session Support

The session support option, sessionSupport, can be used to enable a HttpSession object and access the session object while processing the exchange. For example, the following route enables sessions:
<route>
    <from uri="jetty:http://0.0.0.0/myapp/myservice/?sessionSupport=true"/>
    <processRef ref="myCode"/>
<route>
Copy to Clipboard Toggle word wrap
The myCode Processor can be instantiated by a Spring bean element:
<bean id="myCode"class="com.mycompany.MyCodeProcessor"/>
Copy to Clipboard Toggle word wrap
Where the processor implementation can access the HttpSession as follows:
public void process(Exchange exchange) throws Exception {
    HttpSession session = exchange.getIn(HttpMessage.class).getRequest().getSession();
    ...
}
Copy to Clipboard Toggle word wrap

Using the JSSE Configuration Utility

As of Camel 2.8, the Jetty component supports SSL/TLS configuration through the Camel JSSE Configuration Utility.  This utility greatly decreases the amount of component specific code you need to write and is configurable at the endpoint and component levels. The following examples demonstrate how to use the utility with the Jetty component.

Programmatic configuration of the component

KeyStoreParameters ksp = new KeyStoreParameters();
ksp.setResource("/users/home/server/keystore.jks");
ksp.setPassword("keystorePassword");

KeyManagersParameters kmp = new KeyManagersParameters();
kmp.setKeyStore(ksp);
kmp.setKeyPassword("keyPassword");

SSLContextParameters scp = new SSLContextParameters();
scp.setKeyManagers(kmp);

JettyComponent jettyComponent = getContext().getComponent("jetty", JettyComponent.class);
jettyComponent.setSslContextParameters(scp);
Copy to Clipboard Toggle word wrap

Spring DSL based configuration of endpoint

...
  <camel:sslContextParameters
      id="sslContextParameters">
    <camel:keyManagers
        keyPassword="keyPassword">
      <camel:keyStore
          resource="/users/home/server/keystore.jks"
          password="keystorePassword"/>
    </camel:keyManagers>
  </camel:sslContextParameters>...
...
  <to uri="jetty:https://127.0.0.1/mail/?sslContextParametersRef=sslContextParameters"/>
...
Copy to Clipboard Toggle word wrap

Configuring Jetty Directly

Jetty provides SSL support out of the box. To enable Jetty to run in SSL mode, simply format the URI with the https:// prefix---for example:
<from uri="jetty:https://0.0.0.0/myapp/myservice/"/>
Copy to Clipboard Toggle word wrap
Jetty also needs to know where to load your keystore from and what passwords to use in order to load the correct SSL certificate. Set the following JVM System Properties:
until Camel 2.2
  • jetty.ssl.keystore specifies the location of the Java keystore file, which contains the Jetty server's own X.509 certificate in a key entry. A key entry stores the X.509 certificate (effectively, the public key) and also its associated private key.
  • jetty.ssl.password the store password, which is required to access the keystore file (this is the same password that is supplied to the keystore command's \-storepass option).
  • jetty.ssl.keypassword the key password, which is used to access the certificate's key entry in the keystore (this is the same password that is supplied to the keystore command's \-keypass option).
from Camel 2.3 onwards
  • org.eclipse.jetty.ssl.keystore specifies the location of the Java keystore file, which contains the Jetty server's own X.509 certificate in a key entry. A key entry stores the X.509 certificate (effectively, the public key) and also its associated private key.
  • org.eclipse.jetty.ssl.password the store password, which is required to access the keystore file (this is the same password that is supplied to the keystore command's \-storepass option).
  • org.eclipse.jetty.ssl.keypassword the key password, which is used to access the certificate's key entry in the keystore (this is the same password that is supplied to the keystore command's \-keypass option).
For details of how to configure SSL on a Jetty endpoint, read the following documentation at the Jetty Site: http://docs.codehaus.org/display/JETTY/How+to+configure+SSL
Some SSL properties aren't exposed directly by Camel, however Camel does expose the underlying SslSocketConnector, which will allow you to set properties like needClientAuth for mutual authentication requiring a client certificate or wantClientAuth for mutual authentication where a client doesn't need a certificate but can have one. There's a slight difference between the various Camel versions:
Up to Camel 2.2
<bean id="jetty" class="org.apache.camel.component.jetty.JettyHttpComponent">
    <property name="sslSocketConnectors">
        <map>
            <entry key="8043">
                <bean class="org.mortbay.jetty.security.SslSocketConnector">
                    <property name="password"value="..."/>
                    <property name="keyPassword"value="..."/>
                    <property name="keystore"value="..."/>
                    <property name="needClientAuth"value="..."/>
                    <property name="truststore"value="..."/>
                </bean>
            </entry>
        </map>
    </property>
</bean>
Copy to Clipboard Toggle word wrap
Camel 2.3, 2.4
<bean id="jetty" class="org.apache.camel.component.jetty.JettyHttpComponent">
    <property name="sslSocketConnectors">
        <map>
            <entry key="8043">
                <bean class="org.eclipse.jetty.server.ssl.SslSocketConnector">
                    <property name="password"value="..."/>
                    <property name="keyPassword"value="..."/>
                    <property name="keystore"value="..."/>
                    <property name="needClientAuth"value="..."/>
                    <property name="truststore"value="..."/>
                </bean>
            </entry>
        </map>
    </property>
</bean>
Copy to Clipboard Toggle word wrap
\*From Camel 2.5 we switch to use SslSelectChannelConnector *
<bean id="jetty" class="org.apache.camel.component.jetty.JettyHttpComponent">
    <property name="sslSocketConnectors">
        <map>
            <entry key="8043">
                <bean class="org.eclipse.jetty.server.ssl.SslSelectChannelConnector">
                    <property name="password"value="..."/>
                    <property name="keyPassword"value="..."/>
                    <property name="keystore"value="..."/>
                    <property name="needClientAuth"value="..."/>
                    <property name="truststore"value="..."/>
                </bean>
            </entry>
        </map>
    </property>
</bean>
Copy to Clipboard Toggle word wrap
The value you use as keys in the above map is the port you configure Jetty to listen on.

Configuring general SSL properties

Available as of Camel 2.5
Instead of a per port number specific SSL socket connector (as shown above) you can now configure general properties which applies for all SSL socket connectors (which is not explicit configured as above with the port number as entry).
<bean id="jetty" class="org.apache.camel.component.jetty.JettyHttpComponent">
    <property name="sslSocketConnectorProperties">
        <map>
            <entry key="password"value="..."/>
            <entry key="keyPassword"value="..."/>
            <entry key="keystore"value="..."/>
            <entry key="needClientAuth"value="..."/>
            <entry key="truststore"value="..."/>
        </map>
    </property>
</bean>
Copy to Clipboard Toggle word wrap

How to obtain reference to the X509Certificate

Jetty stores a reference to the certificate in the HttpServletRequest which you can access from code as follows:
HttpServletRequest req = exchange.getIn().getBody(HttpServletRequest.class);
X509Certificate cert = (X509Certificate) req.getAttribute("javax.servlet.request.X509Certificate")
Copy to Clipboard Toggle word wrap

Configuring general HTTP properties

Available as of Camel 2.5
Instead of a per port number specific HTTP socket connector (as shown above) you can now configure general properties which applies for all HTTP socket connectors (which is not explicit configured as above with the port number as entry).
<bean id="jetty" class="org.apache.camel.component.jetty.JettyHttpComponent">
    <property name="socketConnectorProperties">
        <map>
            <entry key="acceptors" value="4"/>
            <entry key="maxIdleTime" value="300000"/>
        </map>
    </property>
</bean>
Copy to Clipboard Toggle word wrap
If the HTTP requests are handled by an Apache server and forwarded to Jetty with mod_proxy, the original client IP address is in the X-Forwarded-For header and the HttpServletRequest.getRemoteAddr() will return the address of the Apache proxy.
Jetty has a forwarded property which takes the value from X-Forwarded-For and places it in the HttpServletRequest remoteAddr property. This property is not available directly through the endpoint configuration but it can be easily added using the socketConnectors property:
<bean id="jetty" class="org.apache.camel.component.jetty.JettyHttpComponent">
    <property name="socketConnectors">
        <map>
            <entry key="8080">
                <bean class="org.eclipse.jetty.server.nio.SelectChannelConnector">
                    <property name="forwarded" value="true"/>
                </bean>
            </entry>
        </map>
    </property>
</bean>
Copy to Clipboard Toggle word wrap
This is particularly useful when an existing Apache server handles TLS connections for a domain and proxies them to application servers internally.

Default behaviour for returning HTTP status codes

The default behavior of HTTP status codes is defined by the org.apache.camel.component.http.DefaultHttpBinding class, which handles how a response is written and also sets the HTTP status code.
If the exchange was processed successfully, the 200 HTTP status code is returned. If the exchange failed with an exception, the 500 HTTP status code is returned, and the stacktrace is returned in the body. If you want to specify which HTTP status code to return, set the code in the Exchange.HTTP_RESPONSE_CODE header of the OUT message.

Customizing HttpBinding

By default, Camel uses the org.apache.camel.component.http.DefaultHttpBinding to handle how a response is written. If you like, you can customize this behavior either by implementing your own HttpBinding class or by extending DefaultHttpBinding and overriding the appropriate methods.
The following example shows how to customize the DefaultHttpBinding in order to change how exceptions are returned:
public class MyHttpBinding extends DefaultHttpBinding {
    public MyHttpBinding(HttpEndpoint ep) {
        super(ep);
    }
    @Override
    public void doWriteExceptionResponse(Throwable exception, HttpServletResponse response) throws IOException {
        // we override the doWriteExceptionResponse as we only want to alter the binding how exceptions is
        // written back to the client. 

        // we just return HTTP 200 so the client thinks its okay
        response.setStatus(200);
        // and we return this fixed text
        response.getWriter().write("Something went wrong but we dont care");
    }
}
Copy to Clipboard Toggle word wrap
We can then create an instance of our binding and register it in the Spring registry as follows:
<bean id="mybinding"class="com.mycompany.MyHttpBinding"/>
Copy to Clipboard Toggle word wrap
And then we can reference this binding when we define the route:
<route><from uri="jetty:http://0.0.0.0:8080/myapp/myservice?httpBindingRef=mybinding"/><to uri="bean:doSomething"/></route>
Copy to Clipboard Toggle word wrap

Jetty handlers and security configuration

You can configure a list of Jetty handlers on the endpoint, which can be useful for enabling advanced Jetty security features. These handlers are configured in Spring XML as follows:
<-- Jetty Security handling -->
<bean id="userRealm" class="org.mortbay.jetty.plus.jaas.JAASUserRealm">
    <property name="name" value="tracker-users"/>
    <property name="loginModuleName" value="ldaploginmodule"/>
</bean>

<bean id="constraint" class="org.mortbay.jetty.security.Constraint">
    <property name="name" value="BASIC"/>
    <property name="roles" value="tracker-users"/>
    <property name="authenticate" value="true"/>
</bean>

<bean id="constraintMapping" class="org.mortbay.jetty.security.ConstraintMapping">
    <property name="constraint" ref="constraint"/>
    <property name="pathSpec" value="/*"/>
</bean>

<bean id="securityHandler" class="org.mortbay.jetty.security.SecurityHandler">
    <property name="userRealm" ref="userRealm"/>
    <property name="constraintMappings" ref="constraintMapping"/>
</bean>
Copy to Clipboard Toggle word wrap
And from Camel 2.3 onwards you can configure a list of Jetty handlers as follows:
<-- Jetty Security handling -->
<bean id="constraint" class="org.eclipse.jetty.http.security.Constraint">
    <property name="name" value="BASIC"/>
    <property name="roles" value="tracker-users"/>
    <property name="authenticate" value="true"/>
</bean>

<bean id="constraintMapping" class="org.eclipse.jetty.security.ConstraintMapping">
    <property name="constraint" ref="constraint"/>
    <property name="pathSpec" value="/*"/>
</bean>

<bean id="securityHandler" class="org.eclipse.jetty.security.ConstraintSecurityHandler">
    <property name="authenticator">
        <bean class="org.eclipse.jetty.security.authentication.BasicAuthenticator"/>
    </property>
    <property name="constraintMappings">
        <list>
            <ref bean="constraintMapping"/>
        </list>
    </property>
</bean>
Copy to Clipboard Toggle word wrap
You can then define the endpoint as:
from("jetty:http://0.0.0.0:9080/myservice?handlers=securityHandler")
Copy to Clipboard Toggle word wrap
If you need more handlers, set the handlers option equal to a comma-separated list of bean IDs.

How to return a custom HTTP 500 reply message

You may want to return a custom reply message when something goes wrong, instead of the default reply message Camel Jetty replies with. You could use a custom HttpBinding to be in control of the message mapping, but often it may be easier to use Camel's Exception Clause to construct the custom reply message. For example as show here, where we return Dude something went wrong with HTTP error code 500:
from("jetty://http://localhost:{{port}}/myserver")
    // use onException to catch all exceptions and return a custom reply message
    .onException(Exception.class)
        .handled(true)
        // create a custom failure response
        .transform(constant("Dude something went wrong"))
        // we must remember to set error code 500 as handled(true)
        // otherwise would let Camel thing its a OK response (200)
        .setHeader(Exchange.HTTP_RESPONSE_CODE, constant(500))
    .end()
    // now just force an exception immediately
    .throwException(new IllegalArgumentException("I cannot do this"));
Copy to Clipboard Toggle word wrap

Multi-part Form support

From Camel 2.3.0, camel-jetty support to multipart form post out of box. The submitted form-data are mapped into the message header. Camel-jetty creates an attachment for each uploaded file. The file name is mapped to the name of the attachment. The content type is set as the content type of the attachment file name. You can find the example here.
// Set the jetty temp directory which store the file for multi part form
// camel-jetty will clean up the file after it handled the request.
// The option works rightly from Camel 2.4.0
getContext().getProperties().put("CamelJettyTempDir", "target");

from("jetty://http://localhost:{{port}}/test").process(new Processor() {

    public void process(Exchange exchange) throws Exception {
        Message in = exchange.getIn();
        assertEquals("Get a wrong attachement size", 1, in.getAttachments().size());
        // The file name is attachment id
        DataHandler data = in.getAttachment("NOTICE.txt");

        assertNotNull("Should get the DataHandle NOTICE.txt", data);
        // This assert is wrong, but the correct content-type (application/octet-stream)
        // will not be returned until Jetty makes it available - currently the content-type
        // returned is just the default for FileDataHandler (for the implentation being used)
        //assertEquals("Get a wrong content type", "text/plain", data.getContentType());
        assertEquals("Got the wrong name", "NOTICE.txt", data.getName());

        assertTrue("We should get the data from the DataHandle", data.getDataSource()
            .getInputStream().available() > 0);

        // The other form date can be get from the message header
        exchange.getOut().setBody(in.getHeader("comment"));
    }

});
Copy to Clipboard Toggle word wrap

Jetty JMX support

From Camel 2.3.0, camel-jetty supports the enabling of Jetty's JMX capabilities at the component and endpoint level with the endpoint configuration taking priority. Note that JMX must be enabled within the Camel context in order to enable JMX support in this component as the component provides Jetty with a reference to the MBeanServer registered with the Camel context. Because the camel-jetty component caches and reuses Jetty resources for a given protocol/host/port pairing, this configuration option will only be evaluated during the creation of the first endpoint to use a protocol/host/port pairing. For example, given two routes created from the following XML fragments, JMX support would remain enabled for all endpoints listening on "https://0.0.0.0".
<from uri="jetty:https://0.0.0.0/myapp/myservice1/?enableJmx=true"/>
Copy to Clipboard Toggle word wrap
<from uri="jetty:https://0.0.0.0/myapp/myservice2/?enableJmx=false"/>
Copy to Clipboard Toggle word wrap
The camel-jetty component also provides for direct configuration of the Jetty MBeanContainer. Jetty creates MBean names dynamically. If you are running another instance of Jetty outside of the Camel context and sharing the same MBeanServer between the instances, you can provide both instances with a reference to the same MBeanContainer in order to avoid name collisions when registering Jetty MBeans.

Chapter 71. JGroups

JGroups Component

Available since Camel 2.10.0
JGroups is a toolkit for reliable multicast communication. The jgroups: component provides exchange of messages between Camel infrastructure and JGroups clusters.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache-extra.camel</groupId>
    <artifactId>camel-jgroups</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

jgroups:clusterName[?options]
Copy to Clipboard Toggle word wrap
Where clusterName represents the name of the JGroups cluster the component should connect to.

Options

Expand
Name Default Value Description
channelProperties null *Camel 2.10.0:* Specifies configuration properties of the JChannel used by the endpoint.

Usage

Using jgroups component on the consumer side of the route will capture messages received by the JChannel associated with the endpoint and forward them to the Camel route. JGroups consumer processes incoming messages asynchronously.
// Capture messages from cluster named
// 'clusterName' and send them to Camel route.
from("jgroups:clusterName").to("seda:queue");
Copy to Clipboard Toggle word wrap
Using jgroups component on the producer side of the route will forward body of the Camel exchanges to the JChannel instance managed by the endpoint.
// Send message to the cluster named 'clusterName'
from("direct:start").to("jgroups:clusterName");
Copy to Clipboard Toggle word wrap

Chapter 72. Jing

Jing Component

The Jing component uses the Jing Library to perform XML validation of the message body using either:
Note that the MSV component can also support RelaxNG XML syntax.

URI format

rng:someLocalOrRemoteResource
rnc:someLocalOrRemoteResource
Copy to Clipboard Toggle word wrap
Where rng means use the RelaxNG XML Syntax whereas rnc means use RelaxNG Compact Syntax. The following examples show possible URI values
Expand
Example Description
rng:foo/bar.rng References the XML file foo/bar.rng on the classpath
rnc:http://foo.com/bar.rnc References the RelaxNG Compact Syntax file from the URL, http://foo.com/bar.rnc.
You can append query options to the URI in the following format, ?option=value&option=value&...

Options

Expand
Option Default Description
compactSyntax false
Whether to validate using RelaxNG compact syntax or not.

Example

The following example shows how to configure a route from the endpoint direct:start which then goes to one of two endpoints, either mock:valid or mock:invalid based on whether or not the XML matches the given RelaxNG Compact Syntax schema (which is supplied on the classpath).
<camelContext xmlns="http://camel.apache.org/schema/spring">
    <route>
        <from uri="direct:start"/>
        <doTry>
            <to uri="rnc:org/apache/camel/component/validator/jing/schema.rnc"/>
            <to uri="mock:valid"/>

            <doCatch>
                <exception>org.apache.camel.ValidationException</exception>
                <to uri="mock:invalid"/>
            </doCatch>
            <doFinally>
                <to uri="mock:finally"/>
            </doFinally>
        </doTry>
    </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Chapter 73. JIRA

JIRA component

Available as of Camel 2.15
The JIRA component interacts with the JIRA API by encapsulating Atlassian's REST Java Client for JIRA. It currently provides polling for new issues and new comments. It is also able to create new issues.
Rather than webhooks, this endpoint relies on simple polling. Reasons include:
  • Concern for reliability/stability
  • The types of payloads we're polling aren't typically large (plus, paging is available in the API)
  • The need to support apps running somewhere not publicly accessible where a webhook would fail
Note that the JIRA API is fairly expansive. Therefore, this component could be easily expanded to provide additional interactions.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-jira</artifactId>
    <version>${camel-version}</version>
</dependency>
Copy to Clipboard Toggle word wrap

URI format

jira://endpoint[?options]
Copy to Clipboard Toggle word wrap

Mandatory Options:

Note that these can be configured directly through the endpoint.
Expand
Option
Description
serverUrl JIRA host server URL
username
JIRA username
password
JIRA password

Consumer Endpoints:

Expand
Endpoint
Context
Body Type
newIssue
polling
com.atlassian.jira.rest.client.domain.BasicIssue
newComment
polling
com.atlassian.jira.rest.client.domain.Comment

Producer Endpoints:

Expand
Endpoint
Body
Required Message Headers
pullRequestComment
String (issue description)
  • ProjectKey (String): The project key
  • IssueTypeId (long): The issue type id (ex: "Bug" is typically 1 in most default configs)
  • IssueSummary (String): The issue summary (title)

URI Options:

Expand
Name
Default Value
Description
delay
60
in seconds
jql Used by the consumer endpoints. More info below.

JQL:

The JQL URI option is used by both consumer endpoints. Theoretically, items like project key, etc. could be URI options themselves. However, by requiring the use of JQL, the consumers become much more flexible and powerful.
At the bare minimum, the consumers will require the following:
jira://[endpoint]?[required options]&jql=project=[project key]
Copy to Clipboard Toggle word wrap
One important thing to note is that the newIssue consumer will automatically append "ORDER BY key desc" to your JQL. This is in order to optimize startup processing, rather than having to index every single issue in the project.
Another note is that, similarly, the newComment consumer will have to index every single issue and comment in the project. Therefore, for large projects, it's vital to optimize the JQL expression as much as possible. For example, the JIRA Toolkit Plugin includes a "Number of comments" custom field -- use '"Number of comments" > 0' in your query. Also try to minimize based on state (status=Open), increase the polling delay, etc. Example:
jira://[endpoint]?[required options]&jql=RAW(project=[project key] AND status in (Open, \"Coding In Progress\") AND \"Number of comments\">0)"
Copy to Clipboard Toggle word wrap

Chapter 74. JMS

JMS Component

Using ActiveMQ
If you are using Apache ActiveMQ, you should prefer the ActiveMQ component as it has been optimized for ActiveMQ. All of the options and samples on this page are also valid for the ActiveMQ component.
Transacted and caching
See section Transactions and Cache Levels below if you are using transactions with JMS as it can impact performance.
Request/Reply over JMS
Make sure to read the section Request-reply over JMS further below on this page for important notes about request/reply, as Camel offers a number of options to configure for performance, and clustered environments.
The JMS component allows messages to be sent to (or consumed from) a JMS Queue or Topic. The implementation of the JMS Component uses Spring's JMS support for declarative transactions, using Spring's JmsTemplate for sending and a MessageListenerContainer for consuming.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-jms</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

jms:[queue:|topic:]destinationName[?options]
Copy to Clipboard Toggle word wrap
Where destinationName is a JMS queue or topic name. By default, the destinationName is interpreted as a queue name. For example, to connect to the queue, FOO.BAR use:
jms:FOO.BAR
Copy to Clipboard Toggle word wrap
You can include the optional queue: prefix, if you prefer:
jms:queue:FOO.BAR
Copy to Clipboard Toggle word wrap
To connect to a topic, you must include the topic: prefix. For example, to connect to the topic, Stocks.Prices, use:
jms:topic:Stocks.Prices
Copy to Clipboard Toggle word wrap
You append query options to the URI using the following format, ?option=value&option=value&...

Using ActiveMQ

The JMS component reuses Spring 2's JmsTemplate for sending messages. This is not ideal for use in a non-J2EE container and typically requires some caching in the JMS provider to avoid poor performance.
If you intend to use Apache ActiveMQ as your Message Broker - which is a good choice as ActiveMQ rocks :-) , then we recommend that you either:
  • Use the ActiveMQ component, which is already optimized to use ActiveMQ efficiently
  • Use the PoolingConnectionFactory in ActiveMQ.

Transactions and Cache Levels

If you are consuming messages and using transactions (transacted=true) then the default settings for cache level can impact performance. If you are using XA transactions then you cannot cache as it can cause the XA transaction to not work properly.
If you are not using XA, then you should consider caching as it speeds up performance, such as setting cacheLevelName=CACHE_CONSUMER.
Through Camel 2.7.x, the default setting for cacheLevelName is CACHE_CONSUMER. You will need to explicitly set cacheLevelName=CACHE_NONE. In Camel 2.8 onwards, the default setting for cacheLevelName is CACHE_AUTO. This default auto detects the mode and sets the cache level accordingly to:
  • CACHE_CONSUMER = if transacted=false
  • CACHE_NONE = if transacted=true
So you can say the default setting is conservative. Consider using cacheLevelName=CACHE_CONSUMER if you are using non-XA transactions.

Durable Subscriptions

If you wish to use durable topic subscriptions, you need to specify both clientId and durableSubscriptionName. The value of the clientId must be unique and can only be used by a single JMS connection instance in your entire network. You may prefer to use Virtual Topics instead to avoid this limitation. More background on durable messaging here.

Message Header Mapping

When using message headers, the JMS specification states that header names must be valid Java identifiers. So try to name your headers to be valid Java identifiers. One benefit of doing this is that you can then use your headers inside a JMS Selector (whose SQL92 syntax mandates Java identifier syntax for headers).
A simple strategy for mapping header names is used by default. The strategy is to replace any dots and hyphens in the header name as shown below and to reverse the replacement when the header name is restored from a JMS message sent over the wire. What does this mean? No more losing method names to invoke on a bean component, no more losing the filename header for the File Component, and so on.
The current header name strategy for accepting header names in Camel is as follows:
  • Dots are replaced by \_DOT\_ and the replacement is reversed when Camel consume the message
  • Hyphen is replaced by \_HYPHEN\_ and the replacement is reversed when Camel consumes the message

Options

You can configure many different properties on the JMS endpoint which map to properties on the JMSConfiguration POJO.
Mapping to Spring JMS
Many of these properties map to properties on Spring JMS, which Camel uses for sending and receiving messages. So you can get more information about these properties by consulting the relevant Spring documentation.
The options are divided into two tables, the first one with the most common options used. The latter contains the rest.

Most commonly used options

Expand
Option Default Value Description
clientId null Sets the JMS client ID to use. Note that this value, if specified, must be unique and can only be used by a single JMS connection instance. It is typically only required for durable topic subscriptions. You may prefer to use Virtual Topics instead.
concurrentConsumers 1 Specifies the default number of concurrent consumers. From Camel 2.10.3 onwards this option can also be used when doing request/reply over JMS. See also the maxMessagesPerTask option to control dynamic scaling up/down of threads.
disableReplyTo false If true, a producer will behave like a InOnly exchange with the exception that JMSReplyTo header is sent out and not be suppressed like in the case of InOnly. Like InOnly the producer will not wait for a reply. A consumer with this flag will behave like InOnly. This feature can be used to bridge InOut requests to another queue so that a route on the other queue will send its response directly back to the original JMSReplyTo.
durableSubscriptionName null The durable subscriber name for specifying durable topic subscriptions. The clientId option must be configured as well.
maxConcurrentConsumers 1 Specifies the maximum number of concurrent consumers. From Camel 2.10.3 onwards this option can also be used when doing request/reply over JMS. See also the maxMessagesPerTask option to control dynamic scaling up/down of threads.
maxMessagesPerTask -1 The number of messages per task. \-1 is unlimited. If you use a range for concurrent consumers (eg min < max), then this option can be used to set a value to eg 100 to control how fast the consumers will shrink when less work is required.
preserveMessageQos false Set to true, if you want to send message using the QoS settings specified on the message, instead of the QoS settings on the JMS endpoint. The following three headers are considered JMSPriority, JMSDeliveryMode, and JMSExpiration. You can provide all or only some of them. If not provided, Camel will fall back to use the values from the endpoint instead. So, when using this option, the headers override the values from the endpoint. The explicitQosEnabled option, by contrast, will only use options set on the endpoint, and not values from the message header.
replyTo null Provides an explicit ReplyTo destination, which overrides any incoming value of Message.getJMSReplyTo(). If you do Request Reply over JMS then make sure to read the section Request-reply over JMS further below for more details, and the replyToType option as well.
replyToOverride null Camel 2.15: Provides an explicit ReplyTo destination in the JMS message, which overrides the setting of replyTo. It is useful if you want to forward the message to a remote Queue and receive the reply message from the ReplyTo destination.
replyToType null Camel 2.9: Allows for explicitly specifying which kind of strategy to use for replyTo queues when doing request/reply over JMS. Possible values are: Temporary, Shared, or Exclusive. By default Camel will use temporary queues. However if replyTo has been configured, then Shared is used by default. This option allows you to use exclusive queues instead of shared ones. See further below for more details, and especially the notes about the implications if running in a clustered environment, and the fact that Shared reply queues has lower performance than its alternatives Temporary and Exclusive.
requestTimeout 20000 Producer only: The timeout for waiting for a reply when using the InOut Exchange Pattern (in milliseconds). The default is 20 seconds. From Camel 2.13/2.12.3 onwards you can include the header CamelJmsRequestTimeout to override this endpoint configured timeout value, and thus have per message individual timeout values. See below in section About time to live for more details. See also the requestTimeoutCheckerInterval option.
selector null Sets the JMS Selector, which is an SQL 92 predicate that is used to filter messages within the broker. You may have to encode special characters such as = as %3D Before Camel 2.3.0, we don't support this option in CamelConsumerTemplate
timeToLive null When sending messages, specifies the time-to-live of the message (in milliseconds). See below in section About time to live for more details.
transacted false Specifies whether to use transacted mode for sending/receiving messages using the InOnly Exchange Pattern.
testConnectionOnStartup false Camel 2.1: Specifies whether to test the connection on startup. This ensures that when Camel starts that all the JMS consumers have a valid connection to the JMS broker. If a connection cannot be granted then Camel throws an exception on startup. This ensures that Camel is not started with failed connections. From Camel 2.8 onwards also the JMS producers is tested as well.

All the other options

Expand
Option Default Value Description
acceptMessagesWhileStopping false Specifies whether the consumer accept messages while it is stopping. You may consider enabling this option, if you start and stop JMS routes at runtime, while there are still messages enqued on the queue. If this option is false, and you stop the JMS route, then messages may be rejected, and the JMS broker would have to attempt redeliveries, which yet again may be rejected, and eventually the message may be moved at a dead letter queue on the JMS broker. To avoid this its recommended to enable this option.
acknowledgementModeName AUTO_ACKNOWLEDGE The JMS acknowledgement name, which is one of: SESSION_TRANSACTED, CLIENT_ACKNOWLEDGE, AUTO_ACKNOWLEDGE, DUPS_OK_ACKNOWLEDGE
acknowledgementMode \-1 The JMS acknowledgement mode defined as an Integer. Allows you to set vendor-specific extensions to the acknowledgment mode. For the regular modes, it is preferable to use the acknowledgementModeName instead.
allowNullBody true Camel 2.9.3/2.10.1: Whether to allow sending messages with no body. If this option is false and the message body is null, then an JMSException is thrown.
alwaysCopyMessage false If true, Camel will always make a JMS message copy of the message when it is passed to the producer for sending. Copying the message is needed in some situations, such as when a replyToDestinationSelectorName is set (incidentally, Camel will set the alwaysCopyMessage option to true, if a replyToDestinationSelectorName is set)
asyncConsumer false Camel 2.9: Whether the JmsConsumer processes the Exchange asynchronously. If enabled then the JmsConsumer may pickup the next message from the JMS queue, while the previous message is being processed asynchronously (by the Asynchronous Routing Engine). This means that messages may be processed not 100% strictly in order. If disabled (as default) then the Exchange is fully processed before the JmsConsumer will pickup the next message from the JMS queue. Note if transacted has been enabled, then asyncConsumer=true does not run asynchronously, as transactions must be executed synchronously (Camel 3.0 may support async transactions).
asyncStartListener false Camel 2.10: Whether to startup the JmsConsumer message listener asynchronously, when starting a route. For example if a JmsConsumer cannot get a connection to a remote JMS broker, then it may block while retrying and/or failover. This will cause Camel to block while starting routes. By setting this option to true, you will let routes startup, while the JmsConsumer connects to the JMS broker using a dedicated thread in asynchronous mode. If this option is used, then beware that if the connection could not be established, then an exception is logged at WARN level, and the consumer will not be able to receive messages; You can then restart the route to retry.
asyncStopListener false Camel 2.10: Whether to stop the JmsConsumer message listener asynchronously, when stopping a route.
autoStartup true Specifies whether the consumer container should auto-startup.
cacheLevelName
CACHE_AUTO (Camel >= 2.8.0) CACHE_CONSUMER (Camel <= 2.7.1)
Sets the cache level by name for the underlying JMS resources. Possible values are: CACHE_AUTO, CACHE_CONNECTION, CACHE_CONSUMER, CACHE_NONE, and CACHE_SESSION. The default setting for Camel 2.8 and newer is CACHE_AUTO. For Camel 2.7.1 and older the default is CACHE_CONSUMER. See the Spring documentation and Transactions Cache Levels for more information.
cacheLevel Sets the cache level by ID for the underlying JMS resources. See cacheLevelName option for more details.
consumerType Default The consumer type to use, which can be one of: Simple, Default, or Custom. The consumer type determines which Spring JMS listener to use. Default will use org.springframework.jms.listener.DefaultMessageListenerContainer, Simple will use org.springframework.jms.listener.SimpleMessageListenerContainer. When Custom is specified, the MessageListenerContainerFactory defined by the messageListenerContainerFactoryRef option will determine what org.springframework.jms.listener.AbstractMessageListenerContainer to use (new option in Camel 2.11 and 2.10.2). This option was temporary removed in Camel 2.7 and 2.8. But has been added back from Camel 2.9 onwards.
connectionFactory null The default JMS connection factory to use for the listenerConnectionFactory and templateConnectionFactory, if neither is specified.
defaultTaskExecutorType (see description) Camel 2.10.4: Specifies what default TaskExecutor type to use in the DefaultMessageListenerContainer, for both consumer endpoints and the ReplyTo consumer of producer endpoints. Possible values: SimpleAsync (uses Spring's SimpleAsyncTaskExecutor) or ThreadPool (uses Spring's ThreadPoolTaskExecutor with optimal values - cached threadpool-like). If not set, it defaults to the previous behaviour, which uses a cached thread pool for consumer endpoints and SimpleAsync for reply consumers. The use of ThreadPool is recommended to reduce "thread trash" in elastic configurations with dynamically increasing and decreasing concurrent consumers.
deliveryMode
null
Camel 2.12.2/2.13: Specifies the delivery mode to be used. Possibles values are those defined by javax.jms.DeliveryMode.
deliveryPersistent true Specifies whether persistent delivery is used by default.
destination null Specifies the JMS Destination object to use on this endpoint.
destinationName null Specifies the JMS destination name to use on this endpoint.
destinationResolver null A pluggable org.springframework.jms.support.destination.DestinationResolver that allows you to use your own resolver (for example, to lookup the real destination in a JNDI registry).
disableTimeToLive false Camel 2.8: Use this option to force disabling time to live. For example when you do request/reply over JMS, then Camel will by default use the requestTimeout value as time to live on the message being sent. The problem is that the sender and receiver systems have to have their clocks synchronized, so they are in sync. This is not always so easy to archive. So you can use disableTimeToLive=true to not set a time to live value on the sent message. Then the message will not expire on the receiver system. See below in section About time to live for more details.
eagerLoadingOfProperties false Enables eager loading of JMS properties as soon as a message is received, which is generally inefficient, because the JMS properties might not be required. But this feature can sometimes catch early any issues with the underlying JMS provider and the use of JMS properties. This feature can also be used for testing purposes, to ensure JMS properties can be understood and handled correctly.
exceptionListener null Specifies the JMS Exception Listener that is to be notified of any underlying JMS exceptions.
errorHandler null >Camel 2.8.2, 2.9: Specifies a org.springframework.util.ErrorHandler to be invoked in case of any uncaught exceptions thrown while processing a Message. By default these exceptions will be logged at the WARN level, if no errorHandler has been configured. From Camel 2.9.1: onwards you can configure logging level and whether stack traces should be logged using the below two options. This makes it much easier to configure, than having to code a custom errorHandler.
errorHandlerLoggingLevel WARN Camel 2.9.1: Allows to configure the default errorHandler logging level for logging uncaught exceptions.
errorHandlerLogStackTrace true Camel 2.9.1: Allows to control whether stacktraces should be logged or not, by the default errorHandler.
explicitQosEnabled false Set if the deliveryMode, priority or timeToLive qualities of service should be used when sending messages. This option is based on Spring's JmsTemplate. The deliveryMode, priority and timeToLive options are applied to the current endpoint. This contrasts with the preserveMessageQos option, which operates at message granularity, reading QoS properties exclusively from the Camel In message headers.
exposeListenerSession true Specifies whether the listener session should be exposed when consuming messages.
forceSendOriginalMessage false >Camel 2.7: When using mapJmsMessage=false Camel will create a new JMS message to send to a new JMS destination if you touch the headers (get or set) during the route. Set this option to true to force Camel to send the original JMS message that was received.
idleTaskExecutionLimit 1 Specifies the limit for idle executions of a receive task, not having received any message within its execution. If this limit is reached, the task will shut down and leave receiving to other executing tasks (in the case of dynamic scheduling; see the maxConcurrentConsumers setting).
idleConsumerLimit 1 Camel 2.8.2, 2.9: Specify the limit for the number of consumers that are allowed to be idle at any given time.
includeSentJMSMessageID false Camel 2.10.3: Only applicable when sending to JMS destination using InOnly (eg fire and forget). Enabling this option will enrich the Camel Exchange with the actual JMSMessageID that was used by the JMS client when the message was sent to the JMS destination.
includeAllJMSXProperties false Camel 2.11.2/2.12: Whether to include all JMSXxxx properties when mapping from JMS to Camel Message. Setting this to true will include properties such as JMSXAppID, and JMSXUserID etc. Note: If you are using a custom headerFilterStrategy then this option does not apply.
jmsMessageType null Allows you to force the use of a specific javax.jms.Message implementation for sending JMS messages. Possible values are: Bytes, Map, Object, Stream, Text. By default, Camel would determine which JMS message type to use from the In body type. This option allows you to specify it.
jmsKeyFormatStrategy default Pluggable strategy for encoding and decoding JMS keys so they can be compliant with the JMS specification. Camel provides two implementations out of the box: default and passthrough. The default strategy will safely marshal dots and hyphens (. and \-). The passthrough strategy leaves the key as is. Can be used for JMS brokers which do not care whether JMS header keys contain illegal characters. You can provide your own implementation of the org.apache.camel.component.jms.JmsKeyFormatStrategy and refer to it using the \# notation.
jmsOperations null Allows you to use your own implementation of the org.springframework.jms.core.JmsOperations interface. Camel uses JmsTemplate as default. Can be used for testing purpose, but not used much as stated in the spring API docs.
lazyCreateTransactionManager true If true, Camel will create a JmsTransactionManager, if there is no transactionManager injected when option transacted=true.
listenerConnectionFactory null The JMS connection factory used for consuming messages.
mapJmsMessage true Specifies whether Camel should auto map the received JMS message to an appropiate payload type, such as javax.jms.TextMessage to a String etc. See section about how mapping works below for more details.
maximumBrowseSize \-1 Limits the number of messages fetched at most, when browsing endpoints using Browse or JMX API.
messageConverter null To use a custom Spring org.springframework.jms.support.converter.MessageConverter so you can be 100% in control how to map to/from a javax.jms.Message.
messageIdEnabled true When sending, specifies whether message IDs should be added.
messageListenerContainerFactoryRef null Camel 2.10.2: Registry ID of the MessageListenerContainerFactory used to determine what org.springframework.jms.listener.AbstractMessageListenerContainer to use to consume messages. Setting this will automatically set consumerType to Custom.
messageTimestampEnabled true Specifies whether timestamps should be enabled by default on sending messages.
password null The password for the connector factory.
priority 4 Values greater than 1 specify the message priority when sending (where 0 is the lowest priority and 9 is the highest). The explicitQosEnabled option must also be enabled in order for this option to have any effect.
pubSubNoLocal false Specifies whether to inhibit the delivery of messages published by its own connection.
receiveTimeout 1000 The timeout for receiving messages (in milliseconds).
recoveryInterval 5000 Specifies the interval between recovery attempts, i.e. when a connection is being refreshed, in milliseconds. The default is 5000 ms, that is, 5 seconds.
replyToCacheLevelName CACHE_CONSUMER Camel 2.9.1: Sets the cache level by name for the reply consumer when doing request/reply over JMS. This option only applies when using fixed reply queues (not temporary). Camel will by default use: CACHE_CONSUMER for exclusive or shared w/ replyToSelectorName. And CACHE_SESSION for shared without replyToSelectorName. Some JMS brokers such as IBM WebSphere may require to set the replyToCacheLevelName=CACHE_NONE to work.
replyToDestinationSelectorName null Sets the JMS Selector using the fixed name to be used so you can filter out your own replies from the others when using a shared queue (that is, if you are not using a temporary reply queue).
replyToDeliveryPersistent true Specifies whether to use persistent delivery by default for replies.
requestTimeoutCheckerInterval 1000 Camel 2.9.2: Configures how often Camel should check for timed out Exchanges when doing request/reply over JMS.By default Camel checks once per second. But if you must react faster when a timeout occurs, then you can lower this interval, to check more frequently. The timeout is determined by the option requestTimeout.
subscriptionDurable false @deprecated: Enabled by default, if you specify a durableSubscriptionName and a clientId.
taskExecutor null Allows you to specify a custom task executor for consuming messages.
taskExecutorSpring2 null Camel 2.6: To use when using Spring 2.x with Camel. Allows you to specify a custom task executor for consuming messages.
templateConnectionFactory null The JMS connection factory used for sending messages.
transactedInOut false @deprecated: Specifies whether to use transacted mode for sending messages using the InOut Exchange Pattern. Applies only to producer endpoints. See section Enabling Transacted Consumption for more details.
transactionManager null The Spring transaction manager to use.
transactionName "JmsConsumer[destinationName]" The name of the transaction to use.
transactionTimeout null The timeout value of the transaction (in seconds), if using transacted mode.
transferException false If enabled and you are using Request Reply messaging (InOut) and an Exchange failed on the consumer side, then the caused Exception will be send back in response as a javax.jms.ObjectMessage. If the client is Camel, the returned Exception is rethrown. This allows you to use Camel JMS as a bridge in your routing - for example, using persistent queues to enable robust routing. Notice that if you also have transferExchange enabled, this option takes precedence. The caught exception is required to be serializable. The original Exception on the consumer side can be wrapped in an outer exception such as org.apache.camel.RuntimeCamelException when returned to the producer.
transferExchange false You can transfer the exchange over the wire instead of just the body and headers. The following fields are transferred: In body, Out body, Fault body, In headers, Out headers, Fault headers, exchange properties, exchange exception. This requires that the objects are serializable. Camel will exclude any non-serializable objects and log it at WARN level. You must enable this option on both the producer and consumer side, so Camel knows the payloads is an Exchange and not a regular payload.
username null The username for the connector factory.
useMessageIDAsCorrelationID false Specifies whether JMSMessageID should always be used as JMSCorrelationID for InOut messages.
useVersion102 false @deprecated (removed from Camel 2.5 onwards): Specifies whether the old JMS API should be used.

Message Mapping between JMS and Camel

Camel automatically maps messages between javax.jms.Message and org.apache.camel.Message.
When sending a JMS message, Camel converts the message body to the following JMS message types:
Expand
Body Type JMS Message Comment
String javax.jms.TextMessage
org.w3c.dom.Node javax.jms.TextMessage The DOM will be converted to String.
Map javax.jms.MapMessage
java.io.Serializable javax.jms.ObjectMessage
byte[] javax.jms.BytesMessage
java.io.File javax.jms.BytesMessage
java.io.Reader javax.jms.BytesMessage
java.io.InputStream javax.jms.BytesMessage
java.nio.ByteBuffer javax.jms.BytesMessage
When receiving a JMS message, Camel converts the JMS message to the following body type:
Expand
JMS Message Body Type
javax.jms.TextMessage String
javax.jms.BytesMessage byte[]
javax.jms.MapMessage Map<String, Object>
javax.jms.ObjectMessage Object

Disabling auto-mapping of JMS messages

You can use the mapJmsMessage option to disable the auto-mapping above. If disabled, Camel will not try to map the received JMS message, but instead uses it directly as the payload. This allows you to avoid the overhead of mapping and let Camel just pass through the JMS message. For instance, it even allows you to route javax.jms.ObjectMessage JMS messages with classes you do not have on the classpath.

Using a custom MessageConverter

You can use the messageConverter option to do the mapping yourself in a Spring org.springframework.jms.support.converter.MessageConverter class.
For example, in the route below we use a custom message converter when sending a message to the JMS order queue:
  from("file://inbox/order").to("jms:queue:order?messageConverter=#myMessageConverter");
Copy to Clipboard Toggle word wrap
You can also use a custom message converter when consuming from a JMS destination.

Controlling the mapping strategy selected

You can use the jmsMessageType option on the endpoint URL to force a specific message type for all messages. In the route below, we poll files from a folder and send them as javax.jms.TextMessage as we have forced the JMS producer endpoint to use text messages:
  from("file://inbox/order").to("jms:queue:order?jmsMessageType=Text");
Copy to Clipboard Toggle word wrap
You can also specify the message type to use for each messabe by setting the header with the key CamelJmsMessageType. For example:
  from("file://inbox/order").setHeader("CamelJmsMessageType", JmsMessageType.Text).to("jms:queue:order");
Copy to Clipboard Toggle word wrap
The possible values are defined in the enum class, org.apache.camel.jms.JmsMessageType.

Message format when sending

The exchange that is sent over the JMS wire must conform to the JMS Message spec.
For the exchange.in.header the following rules apply for the header keys:
  • Keys starting with JMS or JMSX are reserved.
  • exchange.in.headers keys must be literals and all be valid Java identifiers (do not use dots in the key name).
  • Camel replaces dots & hyphens and the reverse when when consuming JMS messages: . is replaced by \_DOT\_ and the reverse replacement when Camel consumes the message. \- is replaced by \_HYPHEN\_ and the reverse replacement when Camel consumes the message.
  • See also the option jmsKeyFormatStrategy, which allows use of your own custom strategy for formatting keys.
For the exchange.in.header, the following rules apply for the header values:
  • The values must be primitives or their counter objects (such as Integer, Long, Character). The types, String, CharSequence, Date, BigDecimal and BigInteger are all converted to their toString() representation. All other types are dropped.
Camel will log with category org.apache.camel.component.jms.JmsBinding at DEBUG level if it drops a given header value. For example:
2008-07-09 06:43:04,046 [main           ] DEBUG JmsBinding
  - Ignoring non primitive header: order of class: org.apache.camel.component.jms.issues.DummyOrder with value: DummyOrder{orderId=333, itemId=4444, quantity=2}
Copy to Clipboard Toggle word wrap

Message format when receiving

Camel adds the following properties to the Exchange when it receives a message:
Expand
Property Type Description
org.apache.camel.jms.replyDestination javax.jms.Destination The reply destination.
Camel adds the following JMS properties to the In message headers when it receives a JMS message:
Expand
Header Type Description
JMSCorrelationID String The JMS correlation ID.
JMSDeliveryMode int The JMS delivery mode.
JMSDestination javax.jms.Destination The JMS destination.
JMSExpiration long The JMS expiration.
JMSMessageID String The JMS unique message ID.
JMSPriority int The JMS priority (with 0 as the lowest priority and 9 as the highest).
JMSRedelivered boolean Is the JMS message redelivered.
JMSReplyTo javax.jms.Destination The JMS reply-to destination.
JMSTimestamp long The JMS timestamp.
JMSType String The JMS type.
JMSXGroupID String The JMS group ID.
The JMS component is complex and you have to pay close attention to how it works in some cases. So this is a short summary of some of the areas/pitfalls to look for.
When Camel sends a message using its JMSProducer, it checks the following conditions:
  • The message exchange pattern,
  • Whether a JMSReplyTo was set in the endpoint or in the message headers,
  • Whether any of the following options have been set on the JMS endpoint: disableReplyTo, preserveMessageQos, explicitQosEnabled.
All this can be a tad complex to understand and configure to support your use case.

JmsProducer

The JmsProducer behaves as follows, depending on configuration:
Expand
Exchange Pattern Other options Description
InOut \- Camel will expect a reply, set a temporary JMSReplyTo, and after sending the message, it will start to listen for the reply message on the temporary queue.
InOut JMSReplyTo is set Camel will expect a reply and, after sending the message, it will start to listen for the reply message on the specified JMSReplyTo queue.
InOnly \- Camel will send the message and not expect a reply.
InOnly JMSReplyTo is set By default, Camel discards the JMSReplyTo destination and clears the JMSReplyTo header before sending the message. Camel then sends the message and does not expect a reply. Camel logs this in the log at WARN level (changed to DEBUG level from Camel 2.6 onwards. You can use preserveMessageQuo=true to instruct Camel to keep the JMSReplyTo. In all situations the JmsProducer does not expect any reply and thus continue after sending the message.

JmsConsumer

The JmsConsumer behaves as follows, depending on configuration:
Expand
Exchange Pattern Other options Description
InOut \- Camel will send the reply back to the JMSReplyTo queue.
InOnly \- Camel will not send a reply back, as the pattern is InOnly.
\- disableReplyTo=true This option suppresses replies.
So pay attention to the message exchange pattern set on your exchanges.
If you send a message to a JMS destination in the middle of your route you can specify the exchange pattern to use, see more at Request Reply. This is useful if you want to send an InOnly message to a JMS topic:
from("activemq:queue:in")
   .to("bean:validateOrder")
   .to(ExchangePattern.InOnly, "activemq:topic:order")
   .to("bean:handleOrder");
Copy to Clipboard Toggle word wrap
If you need to send messages to a lot of different JMS destinations, it makes sense to reuse a JMS endpoint and specify the real destination in a message header. This allows Camel to reuse the same endpoint, but send to different destinations. This greatly reduces the number of endpoints created and economizes on memory and thread resources.
You can specify the destination in the following headers:
Expand
Header Type Description
CamelJmsDestination javax.jms.Destination A destination object.
CamelJmsDestinationName String The destination name.
For example, the following route shows how you can compute a destination at run time and use it to override the destination appearing in the JMS URL:
from("file://inbox")
  .to("bean:computeDestination")
  .to("activemq:queue:dummy");
Copy to Clipboard Toggle word wrap
The queue name, dummy, is just a placeholder. It must be provided as part of the JMS endpoint URL, but it will be ignored in this example.
In the computeDestination bean, specify the real destination by setting the CamelJmsDestinationName header as follows:
public void setJmsHeader(Exchange exchange) {
   String id = ....
   exchange.getIn().setHeader("CamelJmsDestinationName", "order:" + id");
}
Copy to Clipboard Toggle word wrap
Then Camel will read this header and use it as the destination instead of the one configured on the endpoint. So, in this example Camel sends the message to activemq:queue:order:2, assuming the id value was 2.
If both the CamelJmsDestination and the CamelJmsDestinationName headers are set, CamelJmsDestination takes priority. Keep in mind that the JMS producer removes both CamelJmsDestination and CamelJmsDestinationName headers from the exchange and do not propagate them to the created JMS message in order to avoid the accidental loops in the routes (in scenarios when the message will be forwarded to the another JMS endpoint).

Configuring different JMS providers

You can configure your JMS provider in Spring XML as follows:
<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
    <jmxAgent id="agent" disabled="true"/>
</camelContext>

<bean id="activemq" class="org.apache.activemq.camel.component.ActiveMQComponent">
  <property name="connectionFactory">
    <bean class="org.apache.activemq.ActiveMQConnectionFactory">
      <property name="brokerURL" value="vm://localhost?broker.persistent=false&roker.useJmx=false"/>
    </bean>
  </property>
</bean>
Copy to Clipboard Toggle word wrap
Basically, you can configure as many JMS component instances as you wish and give them a unique name using theid attribute. The preceding example configures an activemq component. You could do the same to configure MQSeries, TibCo, BEA, Sonic and so on.
Once you have a named JMS component, you can then refer to endpoints within that component using URIs. For example for the component name, activemq, you can then refer to destinations using the URI format, activemq:[queue:|topic:]destinationName. You can use the same approach for all other JMS providers.
This works by the SpringCamelContext lazily fetching components from the spring context for the scheme name you use for Endpoint URIs and having the Component resolve the endpoint URIs.

Using JNDI to find the ConnectionFactory

If you are using a J2EE container, you might need to look up JNDI to find the JMS ConnectionFactory rather than use the usual <bean> mechanism in Spring. You can do this using Spring's factory bean or the new Spring XML namespace. For example:
<bean id="weblogic" class="org.apache.camel.component.jms.JmsComponent">
  <property name="connectionFactory" ref="myConnectionFactory"/>
</bean>

<jee:jndi-lookup id="myConnectionFactory" jndi-name="jms/connectionFactory"/>
Copy to Clipboard Toggle word wrap
See The jee schema in the Spring reference documentation for more details about JNDI lookup.

Concurrent Consuming

A common requirement with JMS is to consume messages concurrently in multiple threads in order to make an application more responsive. You can set the concurrentConsumers option to specify the number of threads servicing the JMS endpoint, as follows:
from("jms:SomeQueue?concurrentConsumers=20").
  bean(MyClass.class);
Copy to Clipboard Toggle word wrap
You can configure this option in one of the following ways:
  • On the JmsComponent,
  • On the endpoint URI or,
  • By invoking setConcurrentConsumers() directly on the JmsEndpoint.

Concurrent Consuming with async consumer

Notice that each concurrent consumer will only pickup the next available message from the JMS broker, when the current message has been fully processed. You can set the option asyncConsumer=true to let the consumer pickup the next message from the JMS queue, while the previous message is being processed asynchronously (by the Asynchronous Routing Engine). See more details in the table on top of the page about the asyncConsumer option.
from("jms:SomeQueue?concurrentConsumers=20&asyncConsumer=true").
  bean(MyClass.class);
Copy to Clipboard Toggle word wrap

Request-reply over JMS

Camel supports Request Reply over JMS. In essence the MEP of the Exchange should be InOut when you send a message to a JMS queue.
Camel offers a number of options to configure request/reply over JMS that influence performance and clustered environments. The table below summaries the options.
Expand
Option Performance Cluster Description
Temporary Fast Yes A temporary queue is used as reply queue, and automatic created by Camel. To use this do not specify a replyTo queue name. And you can optionally configure replyToType=Temporary to make it stand out that temporary queues are in use.
Shared Slow Yes A shared persistent queue is used as reply queue. The queue must be created beforehand, although some brokers can create them on the fly such as Apache ActiveMQ. To use this you must specify the replyTo queue name. And you can optionally configure replyToType=Shared to make it stand out that shared queues are in use. A shared queue can be used in a clustered environment with multiple nodes running this Camel application at the same time. All using the same shared reply queue. This is possible because JMS Message selectors are used to correlate expected reply messages; this impacts performance though. JMS Message selectors is slower, and therefore not as fast as Temporary or Exclusive queues. See further below how to tweak this for better performance.
Exclusive Fast No An exclusive persistent queue is used as reply queue. The queue must be created beforehand, although some brokers can create them on the fly such as Apache ActiveMQ. To use this you must specify the replyTo queue name. And you must configure replyToType=Exclusive to instruct Camel to use exclusive queues, as Shared is used by default, if a replyTo queue name was configured. When using exclusive reply queues, then JMS Message selectors are not in use, and therefore other applications must not use this queue as well. An exclusive queue cannot be used in a clustered environment with multiple nodes running this Camel application at the same time; as we do not have control if the reply queue comes back to the same node that sent the request message; that is why shared queues use JMS Message selectors to make sure of this. Though if you configure each Exclusive reply queue with an unique name per node, then you can run this in a clustered environment. As then the reply message will be sent back to that queue for the given node, that awaits the reply message.
concurrentConsumers Fast Yes Camel 2.10.3: Allows to process reply messages concurrently using concurrent message listeners in use. You can specify a range using the concurrentConsumers and maxConcurrentConsumers options. Notice: That using Shared reply queues may not work as well with concurrent listeners, so use this option with care.
maxConcurrentConsumers Fast Yes Camel 2.10.3: Allows to process reply messages concurrently using concurrent message listeners in use. You can specify a range using the concurrentConsumers and maxConcurrentConsumers options. Notice: That using Shared reply queues may not work as well with concurrent listeners, so use this option with care.
The JmsProducer detects the InOut and provides a JMSReplyTo header with the reply destination to be used. By default Camel uses a temporary queue, but you can use the replyTo option on the endpoint to specify a fixed reply queue (see more below about fixed reply queue).
Camel will automatic setup a consumer which listen on the reply queue, so you should not do anything. This consumer is a Spring DefaultMessageListenerContainer which listen for replies. However it's fixed to 1 concurrent consumer. That means replies will be processed in sequence as there are only 1 thread to process the replies. If you want to process replies faster, then we need to use concurrency. But not using the concurrentConsumer option. We should use the threads from the Camel DSL instead, as shown in the route below:
from(xxx)
.inOut().to("activemq:queue:foo")
.threads(5)
.to(yyy)
.to(zzz);
Copy to Clipboard Toggle word wrap
In this route we instruct Camel to route replies asynchronously using a thread pool with 5 threads.
Tip
Instead of using threads, then use concurrentConsumers option if using Camel 2.10.3 or better. See further below.
From Camel 2.10.3 onwards you can now configure the listener to use concurrent threads using the concurrentConsumers and maxConcurrentConsumers options. This allows you to easier configure this in Camel as shown below:
from(xxx)
.inOut().to("activemq:queue:foo?concurrentConsumers=5")
.to(yyy)
.to(zzz);
Copy to Clipboard Toggle word wrap
If you use a fixed reply queue when doing Request Reply over JMS as shown in the example below, then pay attention.
from(xxx)
.inOut().to("activemq:queue:foo?replyTo=bar")
.to(yyy)
Copy to Clipboard Toggle word wrap
In this example the fixed reply queue named "bar" is used. By default Camel assumes the queue is shared when using fixed reply queues, and therefore it uses a JMSSelector to only pickup the expected reply messages (eg based on the JMSCorrelationID). See next section for exclusive fixed reply queues. That means its not as fast as temporary queues. You can speedup how often Camel will pull for reply messages using the receiveTimeout option. By default its 1000 millis. So to make it faster you can set it to 250 millis to pull 4 times per second as shown:
from(xxx)
.inOut().to("activemq:queue:foo?replyTo=bar&receiveTimeout=250")
.to(yyy)
Copy to Clipboard Toggle word wrap
Notice this will cause the Camel to send pull requests to the message broker more frequent, and thus require more network traffic. It is generally recommended to use temporary queues if possible.
Available as of Camel 2.9
In the previous example, Camel would anticipate the fixed reply queue named "bar" was shared, and thus it uses a JMSSelector to only consume reply messages which it expects. However there is a drawback doing this as JMS selectos is slower. Also the consumer on the reply queue is slower to update with new JMS selector ids. In fact it only updates when the receiveTimeout option times out, which by default is 1 second. So in theory the reply messages could take up till about 1 sec to be detected. On the other hand if the fixed reply queue is exclusive to the Camel reply consumer, then we can avoid using the JMS selectors, and thus be more performant. In fact as fast as using temporary queues. So in Camel 2.9 onwards we introduced the ReplyToType option which you can configure to Exclusive to tell Camel that the reply queue is exclusive as shown in the example below:
from(xxx)
.inOut().to("activemq:queue:foo?replyTo=bar&replyToType=Exclusive")
.to(yyy)
Copy to Clipboard Toggle word wrap
Mind that the queue must be exclusive to each and every endpoint. So if you have two routes, then they each need an unique reply queue as shown in the next example:
from(xxx)
.inOut().to("activemq:queue:foo?replyTo=bar&replyToType=Exclusive")
.to(yyy)

from(aaa)
.inOut().to("activemq:queue:order?replyTo=order.reply&replyToType=Exclusive")
.to(bbb)
Copy to Clipboard Toggle word wrap
The same applies if you run in a clustered environment. Then each node in the cluster must use an unique reply queue name. As otherwise each node in the cluster may pickup messages which was intended as a reply on another node. For clustered environments its recommended to use shared reply queues instead.

Synchronizing clocks between senders and receivers

When doing messaging between systems, its desirable that the systems have synchronized clocks. For example when sending a JMS message, then you can set a time to live value on the message. Then the receiver can inspect this value, and determine if the message is already expired, and thus drop the message instead of consume and process it. However this requires that both sender and receiver have synchronized clocks. If you are using ActiveMQ then you can use the timestamp plugin to synchronize clocks.

About time to live

Read first above about synchronized clocks.
When you do request/reply (InOut) over JMS with Camel then Camel uses a timeout on the sender side, which is default 20 seconds from the requestTimeout option. You can control this by setting a higher/lower value. However the time to live value is still set on the JMS message being send. So that requires the clocks to be synchronized between the systems. If they are not, then you may want to disable the time to live value being set. This is now possible using the disableTimeToLive option from Camel 2.8 onwards. So if you set this option to disableTimeToLive=true, then Camel does not set any time to live value when sending JMS messages. But the request timeout is still active. So for example if you do request/reply over JMS and have disabled time to live, then Camel will still use a timeout by 20 seconds (the requestTimeout option). That option can of course also be configured. So the two options requestTimeout and disableTimeToLive gives you fine grained control when doing request/reply.
From Camel 2.13/2.12.3 onwards you can provide a header in the message to override and use as the request timeout value instead of the endpoint configured value. For example:
   from("direct:someWhere")
     .to("jms:queue:foo?replyTo=bar&requestTimeout=30s")
     .to("bean:processReply");
Copy to Clipboard Toggle word wrap
In the route above we have a endpoint configured requestTimeout of 30 seconds. So Camel will wait up till 30 seconds for that reply message to come back on the bar queue. If no reply message is received then a org.apache.camel.ExchangeTimedOutException is set on the Exchange and Camel continues routing the message, which would then fail due the exception, and Camel's error handler reacts.
If you want to use a per message timeout value, you can set the header with key org.apache.camel.component.jms.JmsConstants#JMS_REQUEST_TIMEOUT which has constant value "CamelJmsRequestTimeout" with a timeout value as long type.
For example we can use a bean to compute the timeout value per individual message, such as calling the whatIsTheTimeout method on the service bean as shown below:
   from("direct:someWhere")
     .setHeader("CamelJmsRequestTimeout", method(ServiceBean.class, "whatIsTheTimeout"))
     .to("jms:queue:foo?replyTo=bar&requestTimeout=30s")
     .to("bean:processReply");
Copy to Clipboard Toggle word wrap
When you do fire and forget (InOut) over JMS with Camel then Camel by default does not set any time to live value on the message. You can configure a value by using the timeToLive option. For example to indicate a 5 sec., you set timeToLive=5000. The option disableTimeToLive can be used to force disabling the time to live, also for InOnly messaging. The requestTimeout option is not being used for InOnly messaging.

Enabling Transacted Consumption

A common requirement is to consume from a queue in a transaction and then process the message using the Camel route. To do this, just ensure that you set the following properties on the component/endpoint:
  • transacted = true
  • transactionManager = a Transsaction Manager \- typically the JmsTransactionManager
See the Transactional Client EIP pattern for further details.
Transactions and [Request Reply] over JMS
When using Request Reply over JMS you cannot use a single transaction; JMS will not send any messages until a commit is performed, so the server side won't receive anything at all until the transaction commits. Therefore to use Request Reply you must commit a transaction after sending the request and then use a separate transaction for receiving the response.
To address this issue the JMS component uses different properties to specify transaction use for oneway messaging and request reply messaging:
The transacted property applies only to the InOnly message Exchange Pattern (MEP).
The transactedInOut property applies to the InOut(Request Reply) message Exchange Pattern (MEP).
If you want to use transactions for Request Reply(InOut MEP), you must set transactedInOut=true.
Available as of Camel 2.10
You can leverage the DMLC transacted session API using the following properties on component/endpoint:
  • transacted = true
  • lazyCreateTransactionManager = false
The benefit of doing so is that the cacheLevel setting will be honored when using local transactions without a configured TransactionManager. When a TransactionManager is configured, no caching happens at DMLC level and its necessary to rely on a pooled connection factory. For more details about this kind of setup see here and here.

Using JMSReplyTo for late replies

When using Camel as a JMS listener, it sets an Exchange property with the value of the ReplyTo javax.jms.Destination object, having the key ReplyTo. You can obtain this Destination as follows:
Destination replyDestination = exchange.getIn().getHeader(JmsConstants.JMS_REPLY_DESTINATION, Destination.class);
Copy to Clipboard Toggle word wrap
And then later use it to send a reply using regular JMS or Camel.
    // we need to pass in the JMS component, and in this sample we use ActiveMQ
    JmsEndpoint endpoint = JmsEndpoint.newInstance(replyDestination, activeMQComponent);
    // now we have the endpoint we can use regular Camel API to send a message to it
    template.sendBody(endpoint, "Here is the late reply.");
Copy to Clipboard Toggle word wrap
A different solution to sending a reply is to provide the replyDestination object in the same Exchange property when sending. Camel will then pick up this property and use it for the real destination. The endpoint URI must include a dummy destination, however. For example:
    // we pretend to send it to some non existing dummy queue
    template.send("activemq:queue:dummy, new Processor() {
        public void process(Exchange exchange) throws Exception {
            // and here we override the destination with the ReplyTo destination object so the message is sent to there instead of dummy
            exchange.getIn().setHeader(JmsConstants.JMS_DESTINATION, replyDestination);
            exchange.getIn().setBody("Here is the late reply.");
        }
    }
Copy to Clipboard Toggle word wrap

Using a request timeout

In the sample below we send a Request Reply style message Exchange (we use the requestBody method = InOut) to the slow queue for further processing in Camel and we wait for a return reply:
// send a in-out with a timeout for 5 sec
Object out = template.requestBody("activemq:queue:slow?requestTimeout=5000", "Hello World");
Copy to Clipboard Toggle word wrap

Samples

JMS is used in many examples for other components as well. But we provide a few samples below to get started.

Receiving from JMS

In the following sample we configure a route that receives JMS messages and routes the message to a POJO:
   from("jms:queue:foo").
     to("bean:myBusinessLogic");
Copy to Clipboard Toggle word wrap
You can of course use any of the EIP patterns so the route can be context based. For example, here's how to filter an order topic for the big spenders:
from("jms:topic:OrdersTopic").
  filter().method("myBean", "isGoldCustomer").
    to("jms:queue:BigSpendersQueue");
Copy to Clipboard Toggle word wrap

Sending to a JMS

In the sample below we poll a file folder and send the file content to a JMS topic. As we want the content of the file as a TextMessage instead of a BytesMessage, we need to convert the body to a String:
from("file://orders").
  convertBodyTo(String.class).
  to("jms:topic:OrdersTopic");
Copy to Clipboard Toggle word wrap

Using Annotations

Camel also has annotations so you can use POJO Consuming and POJO Producing.

Spring DSL sample

The preceding examples use the Java DSL. Camel also supports Spring XML DSL. Here is the big spender sample using Spring DSL:
<route>
  <from uri="jms:topic:OrdersTopic"/>
  <filter>
    <method bean="myBean" method="isGoldCustomer"/>
    <to uri="jms:queue:BigSpendersQueue"/>
  </filter>
</route>
Copy to Clipboard Toggle word wrap

Other samples

JMS appears in many of the examples for other components and EIP patterns, as well in this Camel documentation. So feel free to browse the documentation. If you have time, check out the this tutorial that uses JMS but focuses on how well Spring Remoting and Camel works together Tutorial-JmsRemoting.

Using JMS as a Dead Letter Queue storing Exchange

Normally, when using JMS as the transport, it only transfers the body and headers as the payload. If you want to use JMS with a Dead Letter Channel, using a JMS queue as the Dead Letter Queue, then normally the caused Exception is not stored in the JMS message. You can, however, use the transferExchange option on the JMS dead letter queue to instruct Camel to store the entire Exchange in the queue as a javax.jms.ObjectMessage that holds a org.apache.camel.impl.DefaultExchangeHolder. This allows you to consume from the Dead Letter Queue and retrieve the caused exception from the Exchange property with the key Exchange.EXCEPTION_CAUGHT. The demo below illustrates this:
// setup error handler to use JMS as queue and store the entire Exchange
errorHandler(deadLetterChannel("jms:queue:dead?transferExchange=true"));
Copy to Clipboard Toggle word wrap
Then you can consume from the JMS queue and analyze the problem:
from("jms:queue:dead").to("bean:myErrorAnalyzer");

// and in our bean
String body = exchange.getIn().getBody();
Exception cause = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
// the cause message is
String problem = cause.getMessage();
Copy to Clipboard Toggle word wrap
You can use JMS to store the cause error message or to store a custom body, which you can initialize yourself. The following example uses the Message Translator EIP to do a transformation on the failed exchange before it is moved to the JMS dead letter queue:
// we sent it to a seda dead queue first
errorHandler(deadLetterChannel("seda:dead"));

// and on the seda dead queue we can do the custom transformation before its sent to the JMS queue
from("seda:dead").transform(exceptionMessage()).to("jms:queue:dead");
Copy to Clipboard Toggle word wrap
Here we only store the original cause error message in the transform. You can, however, use any Expression to send whatever you like. For example, you can invoke a method on a Bean or use a custom processor.
When sending to a JMS destination using camel-jms the producer will use the MEP to detect if its InOnly or InOut messaging. However there can be times where you want to send an InOnly message but keeping the JMSReplyTo header. To do so you have to instruct Camel to keep it, otherwise the JMSReplyTo header will be dropped.
For example to send an InOnly message to the foo queue, but with a JMSReplyTo with bar queue you can do as follows:
        template.send("activemq:queue:foo?preserveMessageQos=true", new Processor() {
            public void process(Exchange exchange) throws Exception {
                exchange.getIn().setBody("World");
                exchange.getIn().setHeader("JMSReplyTo", "bar");
            }
        });
Copy to Clipboard Toggle word wrap
Notice we use preserveMessageQos=true to instruct Camel to keep the JMSReplyTo header.

Setting JMS provider options on the destination

Some JMS providers, like IBM's WebSphere MQ need options to be set on the JMS destination. For example, you may need to specify the targetClient option. Since targetClient is a WebSphere MQ option and not a Camel URI option, you need to set that on the JMS destination name like so:
...
.setHeader("CamelJmsDestinationName", constant("queue:///MY_QUEUE?targetClient=1"))
.to("wmq:queue:MY_QUEUE?useMessageIDAsCorrelationID=true");
Copy to Clipboard Toggle word wrap
Some versions of WMQ won't accept this option on the destination name and you will get an exception like:
com.ibm.msg.client.jms.DetailedJMSException: JMSCC0005: The specified value 'MY_QUEUE?targetClient=1' is not allowed for 'XMSC_DESTINATION_NAME'
A workaround is to use a custom DestinationResolver:
JmsComponent wmq = new JmsComponent(connectionFactory);

wmq.setDestinationResolver(new DestinationResolver(){
    public Destination resolveDestinationName(Session session, String destinationName, boolean pubSubDomain) throws JMSException {
        MQQueueSession wmqSession = (MQQueueSession) session;
        return wmqSession.createQueue("queue:///" + destinationName + "?targetClient=1");
    }
});
Copy to Clipboard Toggle word wrap

Chapter 75. JMX

JMX Component

The JMX component enables consumers to subscribe to an MBean's notifications. The component supports passing the Notification object directly through the exchange or serializing it to XML according to the schema provided within this project. This is a consumer-only component. Exceptions are thrown if you attempt to create a producer for it.

URI Format

The component can connect to the local platform MBean server with the following URI:
jmx://platform?options
Copy to Clipboard Toggle word wrap
A remote MBean server URL can be specified after the jmx: scheme prefix, as follows:
jmx:service:jmx:rmi:///jndi/rmi://localhost:1099/jmxrmi?options
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?option=value&option=value&....

URI Options

Expand
Property Required Default Description
format xml Format for the message body. Either xml or raw. If xml, the notification is serialized to XML. If raw, the raw java object is set as the body.
password Credentials for making a remote connection.
objectDomain Yes The domain of the MBean you are connecting to.
objectName The name key for the MBean you are connecting to. Either this property of a list of keys must be provided (but not both). For more details, see the section called “ObjectName Construction”.
notificationFilter Reference to a bean that implements the NotificationFilter interface. The #beanID syntax should be used to reference the bean in the registry.
handback Value to hand back to the listener when a notification is received. This value will be put into the jmx.handback message header.
testConnectionOnStartup true *Camel 2.11* If true, the consumer will throw an exception when unable to establish the JMX connection upon startup. If false, the consumer will attempt to establish the JMX connection every 'x' seconds until the connection is made - where 'x' is the configured reconnectDelay.
reconnectOnConnectionFailure false *Camel 2.11* If true, the consumer will attempt to reconnect to the JMX server when any connection failure occurs. The consumer will attempt to re-establish the JMX connection every 'x' seconds until the connection is made-- where 'x' is the configured reconnectDelay.
reconnectDelay 10 *Camel 2.11* The number of seconds to wait before retrying creation of the initial connection or before reconnecting a lost connection.

ObjectName Construction

The URI must always have the objectDomain property. In addition, the URI must contain either objectName or one or more properties that start with key.

Domain with Name property

When the objectName property is provided, the following constructor is used to build the ObjectName instance for the MBean:
ObjectName(String domain, String key, String value)
Copy to Clipboard Toggle word wrap
The key value in the preceding constructor must be name and the value is the value of the objectName property.

Domain with Hashtable

ObjectName(String domain, Hashtable<String,String> table)
Copy to Clipboard Toggle word wrap
The Hashtable is constructed by extracting properties that start with key. The properties will have the key prefix stripped prior to building the Hashtable. This allows the URI to contain a variable number of properties to identify the MBean.

Example

from("jmx:platform?objectDomain=jmxExample&key.name=simpleBean").
        to("log:jmxEvent");
Copy to Clipboard Toggle word wrap

Full example

A complete example using the JMX component is available under the examples/camel-example-jmx directory.

Monitor Type Consumer

Available as of Camel 2.8 One popular use case for JMX is creating a monitor bean to monitor an attribute on a deployed bean. This requires writing a few lines of Java code to create the JMX monitor and deploy it. As shown below:
 CounterMonitor monitor = new CounterMonitor();
 monitor.addObservedObject(makeObjectName("simpleBean"));
 monitor.setObservedAttribute("MonitorNumber");
 monitor.setNotify(true);
 monitor.setInitThreshold(1);
 monitor.setGranularityPeriod(500);
 registerBean(monitor, makeObjectName("counter"));
 monitor.start();
Copy to Clipboard Toggle word wrap
The 2.8 version introduces a new type of consumer that automatically creates and registers a monitor bean for the specified objectName and attribute. Additional endpoint attributes allow the user to specify the attribute to monitor, type of monitor to create, and any other required properties. The code snippet above is condensed into a set of endpoint properties. The consumer uses these properties to create the CounterMonitor, register it, and then subscribe to its changes. All of the JMX monitor types are supported.

Example

from("jmx:platform?objectDomain=myDomain&objectName=simpleBean&" + 
     "monitorType=counter&observedAttribute=MonitorNumber&initThreshold=1&" +
     "granularityPeriod=500").to("mock:sink");
Copy to Clipboard Toggle word wrap
The example above will cause a new Monitor Bean to be created and depoyed to the local mbean server that monitors the MonitorNumber attribute on the simpleBean. Additional types of monitor beans and options are detailed below. The newly deployed monitor bean is automatically undeployed when the consumer is stopped.

URI Options for Monitor Type

Expand
property type applies to description
monitorType enum all one of the counters, guage, string
observedAttribute string all the attribute being observed
granularityPeriod long all granularity period (in millis) for the attribute being observed. As per JMX, default is 10 seconds
initThreshold number counter initial threshold value
offset number counter offset value
modulus number counter modulus value
differenceMode boolean counter, gauge true if difference should be reported, false for actual value
notifyHigh boolean gauge high notification on/off switch
notifyLow boolean gauge low notification on/off switch
highThreshold number gauge threshold for reporting high notification
lowThreshold number gauge threshold for reporting low notificaton
notifyDiffer boolean string true to fire notification when string differs
notifyMatch boolean string true to fire notification when string matches
stringToCompare string string string to compare against the attribute value
The monitor style consumer is only supported for the local mbean server. JMX does not currently support remote deployment of mbeans without either having the classes already remotely deployed or an adapter library on both the client and server to facilitate a proxy deployment.

Chapter 76. JPA

JPA Component

The jpa component enables you to store and retrieve Java objects from persistent storage using EJB 3's Java Persistence Architecture (JPA), which is a standard interface layer that wraps Object/Relational Mapping (ORM) products such as OpenJPA, Hibernate, TopLink, and so on.

Sending to the endpoint

You can store a Java entity bean in a database by sending it to a JPA producer endpoint. The body of the In message is assumed to be an entity bean (that is, a POJO with an @Entity annotation on it) or a collection or an array of entity beans.
If the body does not contain one of the preceding types, put a Message TranslatorMessage Translator in front of the endpoint to perform the necessary conversion first.

Consuming from the endpoint

Consuming messages from a JPA consumer endpoint removes (or updates) entity beans in the database. This allows you to use a database table as a logical queue: consumers take messages from the queue and then delete/update them to logically remove them from the queue.
If you do not wish to delete the entity bean when it has been processed (and when routing is done), you can specify consumeDelete=false on the URI. This will result in the entity being processed each poll.
If you would rather perform some update on the entity to mark it as processed (such as to exclude it from a future query) then you can annotate a method with @Consumed which will be invoked on your entity bean when the entity bean when it has been processed (and when routing is done).
From Camel 2.13 onwards you can use @PreConsumed which will be invoked on your entity bean before it has been processed (before routing).

URI format

jpa:entityClassName[?options]
Copy to Clipboard Toggle word wrap
For sending to the endpoint, the entityClassName is optional. If specified, it helps the Type Converter to ensure the body is of the correct type.
For consuming, the entityClassName is mandatory.
You can append query options to the URI in the following format, ?option=value&option=value&...

Options

Expand
Name Default Value Description
entityType entityClassName Overrides the entityClassName from the URI.
persistenceUnit camel The JPA persistence unit used by default.
consumeDelete true JPA consumer only: If true, the entity is deleted after it is consumed; if false, the entity is not deleted.
consumeLockEntity true JPA consumer only: Specifies whether or not to set an exclusive lock on each entity bean while processing the results from polling.
flushOnSend true JPA producer only: Flushes the EntityManager after the entity bean has been persisted.
maximumResults -1 JPA consumer only: Set the maximum number of results to retrieve on the Query.
transactionManager null This option is Registry based, which requires the # notation so that the given transactionManager being specified can be looked up properly, e.g. transactionManager=#myTransactionManager. It specifies the transaction manager to use. If none provided, Apache Camel will use a JpaTransactionManager by default. Can be used to set a JTA transaction manager (for integration with an EJB container).
consumer.delay 500 JPA consumer only: Delay in milliseconds between each poll.
consumer.initialDelay 1000 JPA consumer only: Milliseconds before polling starts.
consumer.useFixedDelay false JPA consumer only: Set to true to use fixed delay between polls, otherwise fixed rate is used. See ScheduledExecutorService in JDK for details.
maxMessagesPerPoll 0 Apache Camel 2.0:JPA consumer only: An integer value to define the maximum number of messages to gather per poll. By default, no maximum is set. Can be used to avoid polling many thousands of messages when starting up the server. Set a value of 0 or negative to disable.
consumer.query JPA consumer only: To use a custom query when consuming data.
consumer.namedQuery JPA consumer only: To use a named query when consuming data.
consumer.nativeQuery JPA consumer only: To use a custom native query when consuming data.
consumer.parameters Camel 2.12: JPA consumer only: the parameters map which will be used for building the query. The parameters is an instance of Map which key is String and value is Object. It's is expected to be of the generic type java.util.Map<String, Object>, where the keys are the named parameters of a given JPA query and the values are their corresponding effective values you want to select for.
consumer.resultClass Camel 2.7: JPA consumer only: Defines the type of the returned payload (we will call entityManager.createNativeQuery(nativeQuery, resultClass) instead of entityManager.createNativeQuery(nativeQuery)). Without this option, we will return an object array. Only has an affect when using in conjunction with native query when consuming data.
consumer.transacted false *Camel 2.7.5/2.8.3/2.9: JPA consumer only:* Whether to run the consumer in transacted mode, by which all messages will either commit or rollback, when the entire batch has been processed. The default behavior (false) is to commit all the previously successfully processed messages, and only rollback the last failed message.
consumer.lockModeType WRITE Camel 2.11.2/2.12: To configure the lock mode on the consumer. The possible values is defined in the enum javax.persistence.LockModeType. The default value is changed to PESSIMISTIC_WRITE since Camel 2.13.
consumer.SkipLockedEntity
false
Camel 2.13: To configure whether to use NOWAIT on lock and silently skip the entity.
usePersist false Camel 2.5: JPA producer only: Indicates to use entityManager.persist(entity) instead of entityManager.merge(entity). Note: entityManager.persist(entity) doesn't work for detached entities (where the EntityManager has to execute an UPDATE instead of an INSERT query)!
consumer.SkipLockedEntity
false
Camel 2.13: To configure whether to use NOWAIT on lock and silently skip the entity.

Message Headers

Apache Camel adds the following message headers to the exchange:
Expand
Header Type Description
CamelEntityManager EntityManager Camel 2.12: JPA consumer / Camel 2.12.2: JPA producer: The JPA EntityManager object being used by JpaConsumer or JpaProducer.

Configuring EntityManagerFactory

You are strongly advised to configure the JPA component to use a specific EntityManagerFactory instance. If you do not do so, each JpaEndpoint will auto-create its own EntityManagerFactory instance.For example, you can instantiate a JPA component that references the myEMFactory entity manager factory, as follows:
<bean id="jpa" class="org.apache.camel.component.jpa.JpaComponent">
   <property name="entityManagerFactory" ref="myEMFactory"/>
</bean>
Copy to Clipboard Toggle word wrap
In Camel 2.3 the JpaComponent will auto lookup the EntityManagerFactory from the Registry which means you do not need to configure this on the JpaComponent as shown above. You only need to do so if there is ambiguity, in which case Camel will log a WARN.

Configuring TransactionManager

Since Camel 2.3 the JpaComponent will auto lookup the TransactionManager from the Registry. If Camel does not find any TransactionManager instance registered, it will also look up for the TransactionTemplate and try to extract TransactionManager from it. If no TransactionTemplate is available in the registry, JpaEndpoint will auto-create its own instance of TransactionManager.
If more than a single instance of the TransactionManager is found, Camel logs a WARN message. In such cases, you might want to instantiate and explicitly configure a JPA component that references the myTransactionManager transaction manager, as follows:
<bean id="jpa" class="org.apache.camel.component.jpa.JpaComponent">
   <property name="entityManagerFactory" ref="myEMFactory"/>
   <property name="transactionManager" ref="myTransactionManager"/>
</bean>
Copy to Clipboard Toggle word wrap

Using a consumer with a named query

For consuming only selected entities, you can use the consumer.namedQuery URI query option. First, you have to define the named query in the JPA Entity class:
@Entity
@NamedQuery(name = "step1", query = "select x from MultiSteps x where x.step = 1")
public class MultiSteps {
   ...
}
Copy to Clipboard Toggle word wrap
After that you can define a consumer uri like this one:
from("jpa://org.apache.camel.examples.MultiSteps?consumer.namedQuery=step1")
.to("bean:myBusinessLogic");
Copy to Clipboard Toggle word wrap

Using a consumer with a query

For consuming only selected entities, you can use the consumer.query URI query option. You only have to define the query option:
from("jpa://org.apache.camel.examples.MultiSteps?consumer.query=select o from org.apache.camel.examples.MultiSteps o where o.step = 1")
.to("bean:myBusinessLogic");
Copy to Clipboard Toggle word wrap

Using a consumer with a native query

For consuming only selected entities, you can use the consumer.nativeQuery URI query option. You only have to define the native query option:
from("jpa://org.apache.camel.examples.MultiSteps?consumer.nativeQuery=select * from MultiSteps where step = 1")
.to("bean:myBusinessLogic");
Copy to Clipboard Toggle word wrap
If you use the native query option, you will receive an object array in the message body.

Example

See the Tracer Example for an example using JPA to store traced messages into a database.

Using the JPA based idempotent repository

In this section we will use the JPA based idempotent repository.
First we need to setup a persistence-unit in the persistence.xml file:
<persistence-unit name="idempotentDb" transaction-type="RESOURCE_LOCAL">
   <class>org.apache.camel.processor.idempotent.jpa.MessageProcessed</class>
 
   <properties>
     <property name="openjpa.ConnectionURL" value="jdbc:derby:target/idempotentTest;create=true"/>
     <property name="openjpa.ConnectionDriverName" value="org.apache.derby.jdbc.EmbeddedDriver"/>
     <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema"/>
     <property name="openjpa.Log" value="DefaultLevel=WARN, Tool=INFO"/>
   </properties>
 </persistence-unit>
Copy to Clipboard Toggle word wrap
Second we have to setup a org.springframework.orm.jpa.JpaTemplate which is used by the org.apache.camel.processor.idempotent.jpa.JpaMessageIdRepository:
<!-- this is standard spring JPA configuration -->
 <bean id="jpaTemplate" class="org.springframework.orm.jpa.JpaTemplate">
     <property name="entityManagerFactory" ref="entityManagerFactory"/>
 </bean>
 
 <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
     <!-- we use idempotentDB as the persitence unit name defined in the persistence.xml file -->
     <property name="persistenceUnitName" value="idempotentDb"/>
 </bean>
Copy to Clipboard Toggle word wrap
Afterwards we can configure our org.apache.camel.processor.idempotent.jpa.JpaMessageIdRepository:
<!-- we define our jpa based idempotent repository we want to use in the file consumer -->
 <bean id="jpaStore" class="org.apache.camel.processor.idempotent.jpa.JpaMessageIdRepository">
     <!-- Here we refer to the spring jpaTemplate -->
     <constructor-arg index="0" ref="jpaTemplate"/>
     <!-- This 2nd parameter is the name  (= a cateogry name).
          You can have different repositories with different names -->
     <constructor-arg index="1" value="FileConsumer"/>
 </bean>
Copy to Clipboard Toggle word wrap
And finally we can create our JPA idempotent repository in the spring XML file as well:
<camelContext xmlns="http://camel.apache.org/schema/spring">	
    <route id="JpaMessageIdRepositoryTest">
        <from uri="direct:start" />
        <idempotentConsumer messageIdRepositoryRef="jpaStore">
            <header>messageId</header>
            <to uri="mock:result" />
        </idempotentConsumer>
    </route>
</camelContext>
Copy to Clipboard Toggle word wrap

Chapter 77. Jsch

Jsch

The camel-jsch component supports the SCP protocol using the Client API of the Jsch project. Jsch is already used in camel by the FTP component for the sftp: protocol.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-jsch</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

scp://host[:port]/destination[?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?option=value&option=value&...
The file name can be specified either in the <path> part of the URI or as a "CamelFileName" header on the message (Exchange.FILE_NAME if used in code).

Options

Expand
Name Description Example Default Value
username Specifies the username to use to log in to the remote file system. null
password Specifies the password to use to log in to the remote file system. null
knownHostsFile Sets the known_hosts file, so that the scp endpoint can do host key verification. null
strictHostKeyChecking Sets whether to use strict host key checking. Possible values are: no, yes no
chmod Allows you to set chmod on the stored file. For example chmod=664. null
useUserKnownHostsFile Camel 2.15: If knownHostFile has not been explicitly configured, use the host file from System.getProperty("user.home") + "/.ssh/known_hosts". true

Component options

The JschComponent supports the following options:
Expand
Name Description Default Value
verboseLogging Camel 2.15: JSCH is verbose logging out of the box. Therefore, we turn the logging down to DEBUG logging by default. true

Limitations

Currently camel-jsch supports only a Producer (i.e. copy files to another host).

Chapter 78. JT400

JT/400 Component

The jt400 component allows you to exchanges messages with an AS/400 system using data queues.

URI format

jt400://user:password@system/QSYS.LIB/LIBRARY.LIB/QUEUE.DTAQ[?options]
Copy to Clipboard Toggle word wrap
To call a remote program (Camel 2.7)
jt400://user:password@system/QSYS.LIB/LIBRARY.LIB/program.PGM[?options]
Copy to Clipboard Toggle word wrap
You can append query options to the URI in the following format, ?option=value&option=value&...

URI options

For the data queue message exchange:
Expand
Name Default value Description
ccsid default system CCSID Specifies the CCSID to use for the connection with the AS/400 system.
format text Specifies the data format for sending messages valid options are: text (represented by String) and binary (represented by byte[])
consumer.delay 500 Delay in milliseconds between each poll.
consumer.initialDelay 1000 Milliseconds before polling starts.
consumer.userFixedDelay false true to use fixed delay between polls, otherwise fixed rate is used. See ScheduledExecutorService in JDK for details.
guiAvailable false Camel 2.8: Specifies whether AS/400 prompting is enabled in the environment running Camel.
keyed false *Camel 2.10:* Whether to use keyed or non-keyed data queues.
searchKey null *Camel 2.10:* Search key for keyed data queues.
searchType EQ *Camel 2.10:* Search type which can be a value of EQ, NE, LT, LE, GT, or GE.
connectionPool AS400ConnectionPool instance *Camel 2.10:* Reference to an com.ibm.as400.access.AS400ConnectionPool instance in the Registry. This is used for obtaining connections to the AS/400 system. The look up notation ('#' character) should be used.
For the remote program call (Camel 2.7):
Expand
Name Default value Description
outputFieldsIdx Specifies which fields (program parameters) are output parameters.
fieldsLength Specifies the fields (program parameters) length as in the AS/400 program definition.
format text *Camel 2.10:* Specifies the data format for sending messages valid options are: text (represented by String) and binary (represented by byte[])
guiAvailable false *Camel 2.8:* Specifies whether AS/400 prompting is enabled in the environment running Camel.
connectionPool AS400ConnectionPool instance *Camel 2.10:* Reference to an com.ibm.as400.access.AS400ConnectionPool instance in the Registry. This is used for obtaining connections to the AS/400 system. The look up notation ('#' character) should be used.

Usage

When configured as a consumer endpoint, the endpoint will poll a data queue on a remote system. For every entry on the data queue, a new Exchange is sent with the entry's data in the In message's body, formatted either as a String or a byte[], depending on the format. For a provider endpoint, the In message body contents will be put on the data queue as either raw bytes or text.

Connection pool

Available as of Camel 2.10
Connection pooling is in use from Camel 2.10 onwards. You can explicit configure a connection pool on the Jt400Component, or as an uri option on the endpoint.

Remote program call (Camel 2.7)

This endpoint expects the input to be either a String array or byte[] array (depending on format) and handles all the CCSID handling through the native jt400 library mechanisms. A parameter can be omitted by passing null as the value in its position (the remote program has to support it). After the program execution the endpoint returns either a String array or byte[] array with the values as they were returned by the program (the input only parameters will contain the same data as the beginning of the invocation) This endpoint does not implement a provider endpoint!

Example

In the snippet below, the data for an exchange sent to the direct:george endpoint will be put in the data queue PENNYLANE in library BEATLES on a system named LIVERPOOL. Another user connects to the same data queue to receive the information from the data queue and forward it to the mock:ringo endpoint.
public class Jt400RouteBuilder extends RouteBuilder {

    @Override
    public void configure() throws Exception {
       from("direct:george").to("jt400://GEORGE:EGROEG@LIVERPOOL/QSYS.LIB/BEATLES.LIB/PENNYLANE.DTAQ");
       from("jt400://RINGO:OGNIR@LIVERPOOL/QSYS.LIB/BEATLES.LIB/PENNYLANE.DTAQ").to("mock:ringo");
    }
}
Copy to Clipboard Toggle word wrap

Remote program call example (Camel 2.7)

In the snippet below, the data Exchange sent to the direct:work endpoint will contain three string that will be used as the arguments for the program "compute" in the library "assets". This program will write the output values in the 2nd and 3rd parameters. All the parameters will be sent to the direct:play endpoint.
public class Jt400RouteBuilder extends RouteBuilder {
    @Override
    public void configure() throws Exception {
       from("direct:work").to("jt400://GRUPO:ATWORK@server/QSYS.LIB/assets.LIB/compute.PGM?fieldsLength=10,10,512&ouputFieldsIdx=2,3").to("direct:play");
    }
}
Copy to Clipboard Toggle word wrap

Writing to keyed data queues

from("jms:queue:input")
.to("jt400://username:password@system/lib.lib/MSGINDQ.DTAQ?keyed=true");
Copy to Clipboard Toggle word wrap

Reading from keyed data queues

from("jt400://username:password@system/lib.lib/MSGOUTDQ.DTAQ?keyed=true&searchKey=MYKEY&searchType=GE")
.to("jms:queue:output");
Copy to Clipboard Toggle word wrap

Chapter 79. Kafka

Kafka Component

Available as of Camel 2.13
The kafka: component is used for communicating with Apache Kafka message broker.
Maven users will need to add the following dependency to their pom.xml for this component:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-kafka</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format

kafka:server:port[?options]
Copy to Clipboard Toggle word wrap

Options

Expand
Property
Default
Description
zookeeperHost
The zookeeper host to use
zookeeperPort
2181
The zookeeper port to use
zookeeperConnect Camel 2.13.3/2.14.1: If in use, then zookeeperHost/zookeeperPort is not used.
topic
The topic to use
groupId
partitioner
consumerStreams 10
clientId
zookeeperSessio