[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: Asynchronous acknowledgements

[adrian@jboss.org]

You must have some notion of NACKs, otherwise how do you handle 
all the cases that need redeliveries?

e.g. An error during a message listener

e.g.2. Closing a CLIENT_ACKNOWLEDGE session without
acknowledging the messages

e.g.3. closing the receiver there is a race condition
on the server delivering a message

receiver -> I want a message
server -> there is none, just wait
sender -> send message
server -> queue delivery of message
receiver -> close()
delivery -> Oh! The receiver has vanished -> NACK!

etc.

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