Search
SupportConsoleDevelopersStart a trialContact

Chapter 56. Hazelcast Component

download PDF

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>

URI format

hazelcast:[ map | multimap | queue | topic | seda | set | atomicvalue | instance | list]:cachename[?options]

Options

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:
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
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");

Sample for put:

Java DSL: 
from("direct:put")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.PUT_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
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>

Sample for get:

Java DSL: 
from("direct:get")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.GET_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX)
.to("seda:out");
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>

Sample for update:

Java DSL: 
from("direct:update")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.UPDATE_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
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>

Sample for delete:

Java DSL: 
from("direct:delete")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.DELETE_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
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>

Sample for query

Java DSL: 
from("direct:query")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.QUERY_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX)
.to("seda:out");
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>
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);

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:
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
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!");

Usage of Multi Map

multimap cache producer - to("hazelcast:multimap:foo")

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:
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:
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");

Sample for put:

Java DSL: 
from("direct:put")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.PUT_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
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>

Sample for get:

Java DSL: 
from("direct:get")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.GET_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX)
.to("seda:out");
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>

Sample for update:

Java DSL: 
from("direct:update")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.UPDATE_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
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>

Sample for delete:

Java DSL: 
from("direct:delete")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.DELETE_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX);
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>

Sample for query

Java DSL: 
from("direct:query")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.QUERY_OPERATION))
.toF("hazelcast:%sfoo", HazelcastConstants.MAP_PREFIX)
.to("seda:out");
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>
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);

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:
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
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!");

Usage of Multi Map

multimap cache producer - to("hazelcast:multimap:foo")

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:
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
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));
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>

Sample for removevalue:

Java DSL: 
from("direct:removevalue")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.REMOVEVALUE_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.MULTIMAP_PREFIX);
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>
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");
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>

Sample for delete:

Java DSL: 
from("direct:delete")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.DELETE_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.MULTIMAP_PREFIX);
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>
you can call them in your test class with: 
template.sendBodyAndHeader("direct:[put|get|removevalue|delete]", "my-foo", HazelcastConstants.OBJECT_ID, "4711");

multimap cache consumer - from("hazelcast:multimap:foo")

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!");
Header Variables inside the response message:
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
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);

Sample for put:

from("direct:put")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.PUT_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);

Sample for poll:

from("direct:poll")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.POLL_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);

Sample for peek:

from("direct:peek")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.PEEK_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);

Sample for offer:

from("direct:offer")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.OFFER_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);

Sample for removevalue:

from("direct:removevalue")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.REMOVEVALUE_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);

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!");

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);

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")

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);

Sample for get:

from("direct:get")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.GET_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.LIST_PREFIX)
.to("seda:out");

Sample for setvalue:

from("direct:set")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.SETVALUE_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.LIST_PREFIX);

Sample for removevalue:

from("direct:removevalue")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastConstants.REMOVEVALUE_OPERATION))
.toF("hazelcast:%sbar", HazelcastConstants.LIST_PREFIX);
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!");

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.
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");
Spring DSL : 
<route>
   <from uri="direct:start" />
   <to uri="hazelcast:seda:foo" />
</route>

SEDA consumer from("hazelcast:seda:foo")

The SEDA consumer provides no operations. You only retrieve data from the specified queue.
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");
Spring DSL: 
<route>
  <from uri="hazelcast:seda:foo" />
  <to uri="mock:result" />
</route>

Usage of Atomic Number

Warning
There is no consumer for this endpoint\!

atomic number producer - to("hazelcast:atomicnumber:foo")

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:
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
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);
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>
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);
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>
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);
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>
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);
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>
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);
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>

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");
Each event provides the following information inside the message header:
Header Variables inside the response message:
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
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>

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>

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.

Bundle A create an instance and publishes it as an OSGI service

<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" />

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>
Red Hat logoGithubRedditYoutubeTwitter

Learn

Try, buy, & sell

Communities

About Red Hat Documentation

We help Red Hat users innovate and achieve their goals with our products and services with content they can trust.

Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. For more details, see the Red Hat Blog.

About Red Hat

We deliver hardened solutions that make it easier for enterprises to work across platforms and environments, from the core datacenter to the network edge.

© 2024 Red Hat, Inc.