Time of callback: Asynchronously receiving messages using a listener class

I was developing a small JMS client that registers a message listener for receiving text messages from a JMS provider. The program is single threaded.
I wanted to know when exactly the "onMessage" method is invoked for processing received messages. My client could be performing other processing tasks after registering the listener. In such a scenario, on arrival of a message, when does the program flow jump to the onMessage method? Is it as soon as a message arrives (in which case, the client could be abruptly interuptted in the midst of some processing/system call) ? If so, does the execution return to the exact point of interuption after the onMessage method returns? Or does the java runtime environment implicitly spawn a thread for processing the message?
If the answer to my questions is the former, then does it mean that such clients are best written as multi threaded programs??
Any pointers on this aspect would be greatly appreciated....

Hi,
Even if the JMS specification says that a session is single threaded, asynchronous messages are processed within their own thread. As a programmer (a JMS API user) you don�t have to worry about implementation details. The only thing you have to know is that:
1) Your JMS server pushes messages to your asynchronous listeners upon availability
2) Asynchronous messages are sequentially processed on the session level (concurrency is achieved by using several sessions)
3) Using ExceptionListener allows a client application to be asynchronously notified of a problem (this is useful to do some cleaning or reconnection operations)
I hope this helps
Arnaud
www.arjuna.com

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          Hi,
          I have a problem with stand alone asynchronous subscriber.The asynchronous subscriber
          is not receiving messages even though there are messages published to the same
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          venkat wrote:
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          >
          > Tom Barnes <[email protected]> wrote:
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          >>The code you posted has nothing to stop the "main" from returning, which
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          >>Java is supposed to exit when the main returns.
          >>
          >>If the program works on other JMS vendors, then they
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          >>
          >>venkat wrote:
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          >>
          >>>Hi,
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          >>
          >>of code works
          >>
          >>>with other JMS Providers.
          >>>
          >>>Thanks
          >>>Venkat
          >>>
          >>>Tom Barnes <[email protected]> wrote:
          >>>
          >>>
          >>>>This, of course, works. Otherwise we would have a lot
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          >>>>
          >>>>venkat wrote:
          >>>>
          >>>>
          >>>>>Hi,
          >>>>>
          >>>>>I have a problem with stand alone asynchronous subscriber.The asynchronous
          >>>>
          >>>>subscriber
          >>>>
          >>>>
          >>>>>is not receiving messages even though there are messages published
          >>>>
          >>>>to the same
          >>>>
          >>>>
          >>>>>topic to which this subscriber has subscribed.
          >>>>>
          >>>>>When i run asynchronous subscriber it should wait indefinitely to
          >>
          >>receive
          >>
          >>>>messages
          >>>>
          >>>>
          >>>>>but this subscriber waits for some time and exits. iam using weblogic7.0
          >>>>
          >>>>sp3.
          >>>>
          >>>>
          >>>>>Thanks in advance
          >>>>>
          >>>>>venkat
          >>>>
          >

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Time of callback: Asynchronously receiving messages using a listener class

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