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Date: Sun, 29 Jul 2007 16:25:36 -0700 (PDT)
From: Ladlestein <ribs@acm.org>
To: users@activemq.apache.org
Subject: Re: ActiveMQ onMessage() callback not async
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References: <11836836.post@talk.nabble.com>


If you look at the javadocs for 
http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/jms/MessageListener.html
MessageListener , you'll see that the Session backing your listener won't
call onMessage while a previous onMessage invocation has yet to return.  I'm
puzzled why they even need to say that, though, because a 
http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/jms/Session.html Session 
is a single-threaded context.  If you want concurrent message processing,
you will need multiple threads; using multiple Sessions might be the way to
go.  Someone else with more expertise here could say more.


sparky2708 wrote:
> 
> I am finding that when I receive messages in my java client that I can
> only process one request at a time. It seems like the method:
> onMessage(Message arg) from MessageListener interface doesn't get called
> asynchronously. Do I need to start a thread in this method to get the
> async behavior that I am looking for or am I missing some option when I
> subscribe?
> 

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