JMS: Truely asynchronize?

Posted on 2009-06-28
Last Modified: 2012-05-07
I quoted following text from website:

My questions is how to get truely asynchronize call? When receiving message, JMS seems to use one thread to keep asking whether message is arrived or not?

18.4.2. Synchronous Receiving

While JMS is typically associated with asynchronous processing, it is possible to consume messages synchronously. The overloaded receive methods provide this functionality. During a synchronous receive the calling thread blocks until a message becomes available. This can be a dangerous operation since the calling thread can potentially be blocked indefinitely. The property receiveTimeout specifies how long the receiver should wait before giving up waiting for a message.
Question by:JianJunShen
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CEHJ earned 50 total points
ID: 24732459
JMS can be completely asynchronous. The 'other end' doesn't even need to be connected all the time and you can't get more asynchronous than that
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objects earned 100 total points
ID: 24732649
>  JMS seems to use one thread to keep asking whether message is arrived or not?

That doesn't make it synchronous, that technique wcould still process message asynchronously.
And how it handles receiving the message is dependent on the server implementation, not JMS itself.
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mrjoltcola earned 350 total points
ID: 24732695
Not disagreeing with the 2 statements above, but I think both are not addressing your specific question.

JMS is just another messaging service. In virtual all messaging services (from low level sockets to MQ Series) the differentiation from syncrhonous to asynchronous messaging model has to do with:

1) polling/looping/explicitly checking for messages (syncrhonous)
2) registering a listener and a callback mechanism (asynchonous)

We are discussing asynchronous in terms of receiving the message, not handling the message. Either model can asynchronously _handle_ the method, but that is outside the JMS model at that point.

The point to be clear on is the URL you refer to is a classic synchronous polling method, not a callback method.
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ID: 24733377
Refer to mrjoltcola message, where is tutorial for 2) registering a listener and a callback mechanism (asynchonous)?
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mrjoltcola earned 350 total points
ID: 24733387
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mrjoltcola earned 350 total points
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I believe the book "Spring into Action" also has a good section on it, but my book is at the office so I cannot verify. I recommend buying the book if you are using Spring in your projects. It covers many useful things.

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objects earned 100 total points
ID: 24733399

Thats a bit out of date btw
Do you specifically need to use 1.2?

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