dynamically register transaction listener with spring?

Question

I have a springframework application in which I would like to add a transaction listener to a transaction which is currently in progress. The motivation is to trigger a post commit action which notifies downstream systems. I am using @Transactional to wrap a transaction around some service method -- which is where I want to create/register the post transaction listener. I want to do something "like" the following.

public class MyService {
 @Transaction
 public void doIt() {
  modifyObjects();

  // something like this
  getTransactionManager().registerPostCommitAction(new 
   TransactionSynchronizationAdapter() {
     public void afterCommit() { 
      notifyDownstream(); 
     }
  });
 }
}

Spring has a TransactionSynchronization interface and adapter class which seems exactly what I want; however it is not immediately clear how to register one dynamically with either the current transaction, or the transaction manager. I would rather not subclass JtaTransactionManager if I can avoid it.

Q: Has anyone done this before.

Q: what is the simplest way to register my adapter?

Answer 1

Actually it was not as hard as I thought; spring has a static helper class that puts the 'right' stuff into the thread context.

TransactionSynchronizationManager.registerSynchronization(
    new TransactionSynchronizationAdapter() {
        @Override
        public void afterCommit() {
            s_logger.info("TRANSACTION COMPLETE!!!");
        }
    }
);