How to use

setMessagingOperations

method

in

org.springframework.batch.integration.chunk.ChunkMessageChannelItemWriter

/**
 * Build a master {@link TaskletStep}.
 *
 * @return the configured master step
 * @see RemoteChunkHandlerFactoryBean
 */
public TaskletStep build() {
  Assert.notNull(this.inputChannel, "An InputChannel must be provided");
  Assert.state(this.outputChannel == null || this.messagingTemplate == null,
      "You must specify either an outputChannel or a messagingTemplate but not both.");
  // configure messaging template
  if (this.messagingTemplate == null) {
    this.messagingTemplate = new MessagingTemplate();
    this.messagingTemplate.setDefaultChannel(this.outputChannel);
    if (this.logger.isDebugEnabled()) {
      this.logger.debug("No messagingTemplate was provided, using a default one");
    }
  }
  // configure item writer
  ChunkMessageChannelItemWriter<O> chunkMessageChannelItemWriter = new ChunkMessageChannelItemWriter<>();
  chunkMessageChannelItemWriter.setMessagingOperations(this.messagingTemplate);
  chunkMessageChannelItemWriter.setMaxWaitTimeouts(this.maxWaitTimeouts);
  chunkMessageChannelItemWriter.setThrottleLimit(this.throttleLimit);
  chunkMessageChannelItemWriter.setReplyChannel(this.inputChannel);
  super.writer(chunkMessageChannelItemWriter);
  return super.build();
}

@Before
public void setUp() {
  jobRepository = new SimpleJobRepository(new MapJobInstanceDao(), new MapJobExecutionDao(),
      new MapStepExecutionDao(), new MapExecutionContextDao());
  factory.setJobRepository(jobRepository);
  factory.setTransactionManager(new ResourcelessTransactionManager());
  factory.setBeanName("step");
  factory.setItemWriter(writer);
  factory.setCommitInterval(4);
  MessagingTemplate gateway = new MessagingTemplate();
  writer.setMessagingOperations(gateway);
  gateway.setDefaultChannel(requests);
  writer.setReplyChannel(replies);
  gateway.setReceiveTimeout(100);
  TestItemWriter.count = 0;
  // Drain queues
  Message<?> message = replies.receive(10);
  while (message != null) {
    System.err.println(message);
    message = replies.receive(10);
  }
}

@Bean
public ChunkMessageChannelItemWriter chunkWriter() {
  ChunkMessageChannelItemWriter chunkWriter = new ChunkMessageChannelItemWriter();
  chunkWriter.setMessagingOperations(messageTemplate());
  chunkWriter.setReplyChannel(inboundReplies());
  chunkWriter.setMaxWaitTimeouts(10);
  return chunkWriter;
}