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Chapter 60. Spring Batch

Since Camel 2.10

Only producer is supported

The Spring Batch component and support classes provide integration bridge between Camel and Spring Batch infrastructure.

Maven users must add the following dependency to their pom.xml for this component: 

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-spring-batch</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
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60.1. URI format
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spring-batch:jobName[?options]
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jobName represents the name of the Spring Batch job located in the Camel registry. If a JobRegistry is provided is used to locate the job.

This component is only used to define producer endpoints, that means you cannot use the Spring Batch component in a from() statement.

60.2. Configuring Options
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Camel components are configured on two levels:

  • Component level
  • Endpoint level

60.2.1. Component Level Options
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The component level is the highest level. The configurations you define at this level are inherited by all the endpoints. For example, a component can have security settings, credentials for authentication, urls for network connection, and so on.

Since components typically have pre-configured defaults for the most common cases, you may need to only configure a few component options, or maybe none at all.

You can configure components with Component DSL in a configuration file (application.properties|yaml), or directly with Java code.

60.2.2. Endpoint Level Options
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At the Endpoint level you have many options, which you can use to configure what you want the endpoint to do. The options are categorized according to whether the endpoint is used as a consumer (from) or as a producer (to) or used for both.

You can configure endpoints directly in the endpoint URI as path and query parameters. You can also use Endpoint DSL and DataFormat DSL as type safe ways of configuring endpoints and data formats in Java.

When configuring options, use Property Placeholders for urls, port numbers, sensitive information, and other settings.

Placeholders allows you to externalize the configuration from your code, giving you more flexible and reusable code.

60.3. Component Options
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The Spring Batch component supports 4 options, which are listed below.

Expand
NameDescriptionDefaultType

jobLauncher (producer)

Explicitly specifies a JobLauncher to be used.

 

JobLauncher

jobRegistry (producer)

Explicitly specifies a JobRegistry to be used.

 

JobRegistry

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

boolean

60.4. Endpoint Options
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The Spring Batch endpoint is configured using URI syntax: 

spring-batch:jobName
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Following are the path and query parameters:

60.4.1. Path Parameters (1 parameters)
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Expand
NameDescriptionDefaultType

jobName (producer)

Required The name of the Spring Batch job located in the registry.

 

String

60.4.2. Query Parameters (4 parameters)
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Expand
NameDescriptionDefaultType

jobFromHeader (producer)

Explicitly defines if the jobName should be taken from the headers instead of the URI.

false

boolean

jobLauncher (producer)

Explicitly specifies a JobLauncher to be used.

 

JobLauncher

jobRegistry (producer)

Explicitly specifies a JobRegistry to be used.

 

JobRegistry

lazyStartProducer (producer (advanced))

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

60.5. Usage
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When Spring Batch component receives the message, it triggers the job execution. The job is executed using the org.springframework.batch.core.launch.JobLaucher instance resolved according to the following algorithm.

  • if JobLauncher is manually set on the component, then use it.
  • if jobLauncherRef option is set on the component, then search Camel Registry for the JobLauncher with the given name.
  • if there is JobLauncher registered in the Camel Registry under jobLauncher name, then use it.
  • if none of the steps above allow to resolve the JobLauncher and there is exactly one JobLauncher instance in the Camel Registry, then use it.

All headers found in the message are passed to the JobLauncher as job parameters. String, Long, Double and java.util.Date values are copied to the org.springframework.batch.core.JobParametersBuilder and other data types are converted to Strings.

60.6. Examples
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Triggering the Spring Batch job execution: 

from("direct:startBatch").to("spring-batch:myJob");
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Triggering the Spring Batch job execution with the JobLauncher set explicitly. 

from("direct:startBatch").to("spring-batch:myJob?jobLauncherRef=myJobLauncher");
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A JobExecution instance returned by the JobLauncher is forwarded by the SpringBatchProducer as the output message. You can use the JobExecution instance to perform some operations using the Spring Batch API directly. 

from("direct:startBatch").to("spring-batch:myJob").to("mock:JobExecutions");
...
MockEndpoint mockEndpoint = ...;
JobExecution jobExecution = mockEndpoint.getExchanges().get(0).getIn().getBody(JobExecution.class);
BatchStatus currentJobStatus = jobExecution.getStatus();
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60.7. Support classes
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Apart from the component, Camel Spring Batch also provides support classes that you can use to hook into Spring Batch infrastructure.

60.7.1. CamelItemReader
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CamelItemReader can be used to read batch data directly from the Camel infrastructure.

For example, the snippet below configures Spring Batch to read data from JMS queue: 

<bean id="camelReader" class="org.apache.camel.component.spring.batch.support.CamelItemReader">
  <constructor-arg ref="consumerTemplate"/>
  <constructor-arg value="jms:dataQueue"/>
</bean>

<batch:job id="myJob">
  <batch:step id="step">
    <batch:tasklet>
      <batch:chunk reader="camelReader" writer="someWriter" commit-interval="100"/>
    </batch:tasklet>
  </batch:step>
</batch:job>
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60.7.2. CamelItemWriter
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CamelItemWriter has similar purpose as CamelItemReader, but it is dedicated to write chunk of the processed data.

For example the snippet below configures Spring Batch to read data from JMS queue. 

<bean id="camelwriter" class="org.apache.camel.component.spring.batch.support.CamelItemWriter">
  <constructor-arg ref="producerTemplate"/>
  <constructor-arg value="jms:dataQueue"/>
</bean>

<batch:job id="myJob">
  <batch:step id="step">
    <batch:tasklet>
      <batch:chunk reader="someReader" writer="camelwriter" commit-interval="100"/>
    </batch:tasklet>
  </batch:step>
</batch:job>
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60.7.3. CamelItemProcessor
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CamelItemProcessor is the implementation of Spring Batch org.springframework.batch.item.ItemProcessor interface. The latter implementation relays on Request Reply pattern to delegate the processing of the batch item to the Camel infrastructure. The item to process is sent to the Camel endpoint as the body of the message.

For example the snippet below performs simple processing of the batch item using the Direct endpoint and the Simple expression language. 

<camel:camelContext>
  <camel:route>
    <camel:from uri="direct:processor"/>
    <camel:setExchangePattern pattern="InOut"/>
    <camel:setBody>
      <camel:simple>Processed ${body}</camel:simple>
    </camel:setBody>
  </camel:route>
</camel:camelContext>

<bean id="camelProcessor" class="org.apache.camel.component.spring.batch.support.CamelItemProcessor">
  <constructor-arg ref="producerTemplate"/>
  <constructor-arg value="direct:processor"/>
</bean>

<batch:job id="myJob">
  <batch:step id="step">
    <batch:tasklet>
      <batch:chunk reader="someReader" writer="someWriter" processor="camelProcessor" commit-interval="100"/>
    </batch:tasklet>
  </batch:step>
</batch:job>
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60.7.4. CamelJobExecutionListener
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CamelJobExecutionListener is the implementation of the org.springframework.batch.core.JobExecutionListener interface sending job execution events to the Camel endpoint.

The org.springframework.batch.core.JobExecution instance produced by the Spring Batch is sent as a body of the message. To distinguish between before- and after-callbacks SPRING_BATCH_JOB_EVENT_TYPE header is set to the BEFORE or AFTER value.

The example snippet below sends Spring Batch job execution events to the JMS queue. 

<bean id="camelJobExecutionListener" class="org.apache.camel.component.spring.batch.support.CamelJobExecutionListener">
  <constructor-arg ref="producerTemplate"/>
  <constructor-arg value="jms:batchEventsBus"/>
</bean>

<batch:job id="myJob">
  <batch:step id="step">
    <batch:tasklet>
      <batch:chunk reader="someReader" writer="someWriter" commit-interval="100"/>
    </batch:tasklet>
  </batch:step>
  <batch:listeners>
    <batch:listener ref="camelJobExecutionListener"/>
  </batch:listeners>
</batch:job>
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60.8. Spring Boot Auto-Configuration
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When using spring-batch with Spring Boot, use the following Maven dependency to enable support for auto-configuration: 

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-spring-batch-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>
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The component supports 5 options, which are listed below.

Expand
NameDescriptionDefaultType

camel.component.spring-batch.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.spring-batch.enabled

Whether to enable auto-configuration of the spring-batch component. This is enabled by default.

 

Boolean

camel.component.spring-batch.job-launcher

Explicitly specifies a JobLauncher to be used. The option is a org.springframework.batch.core.launch.JobLauncher type.

 

JobLauncher

camel.component.spring-batch.job-registry

Explicitly specifies a JobRegistry to be used. The option is a org.springframework.batch.core.configuration.JobRegistry type.

 

JobRegistry

camel.component.spring-batch.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean

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