Friday, August 6, 2010

sync/async available for both consumer types

Both sync and async are available to both queue and topic consumers. Receive() method is specified in the MessageConsumer interface.

Asynchronous onMessage() is the celebrated selling point of JMS and MOM in general.

I used queue receiver.receive() in the SIM upfront project.

Unfamiliar to some people, a topic subscriber can also call the blocking receive() method or the non-blocking receiveNoWait() method. What if you have logic in onMessage but also need to use receive() occasionally? P74 [[JMS]] has an exmple, where a topic subscriber, upon returning from receive(), immediately calls this.onMessage(theMsgReceived).

I think this technique can be useful in Swing, where a thread sends a request to a JMS broker, and blocks in receive(). Useful if the sender thread has a lot of local data unavilable to any other (like a listener) thread.

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