How to make the call to service activator transactional after split - spring-integration

Question

I am using following to define my integration flow:
#Bean
public IntegrationFlow pollingFlow(MessageSource<Object> jdbcMessageSource) {
return IntegrationFlows.from(jdbcMessageSource,
c -> c.poller(Pollers.fixedRate(250, TimeUnit.MILLISECONDS)
.maxMessagesPerPoll(1)
.transactional()))
.split()
.channel(taskSourceChannel())
.get();
}
I would like to make call to service activator that reads from taskSourceChannel as transactional. Also, I want to use following with my transaction.
#Bean
public TransactionSynchronizationFactory transactionSynchronizationFactory() {
ExpressionEvaluatingTransactionSynchronizationProcessor syncProcessor
= new ExpressionEvaluatingTransactionSynchronizationProcessor();
syncProcessor.setAfterCommitChannel(successChannel());
syncProcessor.setAfterRollbackChannel(failureChannel());
return new DefaultTransactionSynchronizationFactory(syncProcessor);
}
The taskSourceChannel is an executor channel.
#Bean
public MessageChannel taskSourceChannel() {
return new ExecutorChannel(executor());
}
How can I add transaction support after split while using TransactionSynchronizationFactory. I don't want to make polling transacational. The only solution I can think of is putting transactional on activator but that won't solve my problem. I would like to make it applicable to any service activator uses this channel.

Answer 1

You question is not so clear, but you definitely need to consider to add transaction into the service activator. Although you don't show what is the subscriber for that taskSourceChannel, but you need to think do not have several subscribers on it.
Nevertheless I think your point is to apply TX into the service activator on this taskSourceChannel and everything after that one.
For this purpose Spring Integration provides a TransactionHandleMessageAdvice. See more info the Reference Manual: https://docs.spring.io/spring-integration/reference/html/messaging-endpoints-chapter.html#tx-handle-message-advice.
The TransactionSynchronizationFactory is only used from the AbstractPollingEndpoint implementations. However you can still utilize it in your transactional context relying on the TransactionSynchronizationManager.registerSynchronization().