[Spring Batch Integration] Writing to a channel

[wildcardab]

I am trying to use Spring Batch & Integration in my current project. I have it set up so that when a file arrives on a channel it gets processed via a batch job. I then want the results of the job to be written back to another channel.

I found ChunkMessageChannelItemWriter but I'm having trouble finding useful examples / docs. Any direction as to where to look for those also would be appreciated.

Are there any other existing classes in Spring Batch Integration that can be supplied as a writer to a chunk and output items on a channel?

Thanks!

[Dave Syer]

I haven't really understood your use case. The ChunkMessageChannelItemWriter is mainly intended for use in a Remote Chunking pattern (there are samples / integration tests in the project at https://src.springframework.org/svn/...ch-integration).

[wildcardab]

What I'm trying to accomplish is something like the following sudo-config where the writer for a chunk just writes items to a integration:channel.

<bean id="writer" class="????">
   <property name="output-channel" ref="outputChannel"/>
</bean> 

<batch:job id="processJob" job-repository="jobRepository">
    <batch:step id="parse">
       <batch:tasklet>
           <batch:chunk reader="reader" writer="writer" commit-interval="100"/>
        </batch:tasklet>
    </batch:step>
</batch:job>

Does a writer which simply writes to a channel already exist? It's also possibly I'm not using spring batch integration correctly.

[Dave Syer]

Just use a gateway - it's a standard Spring Integration feature. From MessagingGatewayIntegrationTests-context.xml:

<integration:gateway service-interface="org.springframework.batch.item.ItemWriter" id="writer"	default-request-timeout="100" default-request-channel="inputs" />