Hi Chris,
Are you using queues or topics? If you send a message to a topic, the message will need to be tested against all unique selectors belonging to consumers of that topic to see which consumers match. So there will be an increasing cost as the number of unique selectors on a topic increases. However selector processing may not be the dominant factor in overall message processing compared to network and disc io, thread switching etc. Have you got performance metrics that demonstrate a perfomance issue with selectors?
Gordon
[Message sent by forum member 'sivewrig' (sivewrig)]
http://forums.java.net/jive/thread.jspa?messageID=361353