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From francois1 <>
Subject JMS Chat Application
Date Sat, 29 Mar 2008 00:50:23 GMT


My chat application needs to multicast messages to the proper chat rooms. An
important requirement is that clients must be able to subscribe and
unsubscribe to/from chat rooms. It looks like that it could be done with
message selectors.

Here is my tentative architecture:

1) 1 server runs the JMS provider that manages a topic (ActiveMQ)
2) a servers farm (maybe 5 nodes) relays messages between the JMS provider
and the clients (browsers)
3) each node of the servers farm opens 1 JMS topic connection to the JMS
4) each JMS topic connection is used to spawn 1 JMS topic session per client
(possibly 2,000 per server)

My questions are:

1) Is it OK to end up with 5 JMS topic connections (1 per node in the
servers farm) and 5 x 2,000 = 10,000 JMS sessions? Isn’t it too many?
2) Should I go for plain JMS API, or do you think that Spring can help me? I
have tried to use Spring JMS templates and message listeners, but I have
struggled with the management of resources (create / kill sessions, launch /
stop message listeners).

Any other comment is welcome.

Thank you,
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