I would like to propagate JTA state (= the transaction) between a transactional REST endpoint that emits a message to a reactive-messaging connector.
@Inject
@Channel("test")
Emitter<String> emitter;
@POST
@Transactional
public Response test() {
emitter.send("test");
}
and
@ApplicationScoped
@Connector("test")
public class TestConnector implements OutgoingConnectorFactory {
@Inject
TransactionManager tm;
@Override
public SubscriberBuilder<? extends Message<?>, Void> getSubscriberBuilder(Config config) {
return ReactiveStreams.<Message<?>>builder()
.flatMapCompletionStage(message -> {
tm.getTransaction(); // = null
return message.ack();
})
.ignore();
}
}
As I understand, context-propagation is responsible for making the transaction available (see io.smallrye.context.jta.context.propagation.JtaContextProvider#currentContext). The problem seems to be, that currentContext gets created on subscription, which happens when the injection point (Emitter<String> emitter) get its instance. Which is too early to properly capture the transaction.
What am I missing?
By the way, I am having the same problem when using @Incoming / @Outgoing instead of the emitter. I have decided to give you this example because it is easy to understand and reproduce.
