Flex :: BlazeDS+ActiveMQ Disconnection Of Flex Client From A Durable Topic Does Not Remove It From ActiveMQ
Jul 2, 2011
I'm trying to make a Flex-based desktop application consume messages from an ActiveMQ topic with a durable subscription, using the JMS bridge of BlazeDS. The basic scenario is as follows: Messages are produced by other producers in the topic to which the Flex client is subscribed. The Flex client may go offline from time to time, but it must receive all the messages it has missed while being offline when it connects to BlazeDS again. (Of course the Flex client connects with the same client ID every time). It can not be guaranteed that the Flex client is shut down gracefully.
Everything works fine if I explicitly disconnect my consumer on the Flex side by calling disconnect() - I do it in the exit handler of the application. However, due to #3 above, it is not guaranteed that disconnect() is called all the time. When the Flex client shuts down without calling disconnect(), it seems that the subscription of the "proxy JMS client" that BlazeDS creates and associates to the Flex client stays active towards ActiveMQ, so ActiveMQ still thinks that the client is logged in. When the Flex app starts up the next time, it is unable to log in to BlazeDS because ActiveMQ refuses its subscription, claiming that the client ID is already taken. Why is it so and what can I do here to ensure that BlazeDS makes the "proxy JMS client" offline in ActiveMQ when its real Flex counterpart terminates unexpectedly?
More detailed information: some debugging revealed that:
[Code]...
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