[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: Can acknowledgements be asynchronous for auto_ack?

[adrian@jboss.org]

No. Consider the following:

Synchronous:
Client: receive(); -> server
Client: AUTO_ACK -> synch
Client: process message (only once)
Client: Crash
Client: Reboot
Client: Cannot re-receive the message

Asynchronous:
Client: receive(); -> server
Client: AUTO_ACK -> asynch
Client: process message
Client: Crash (the asynch ACK never made it to the server)
Client: Reboot
Client: Can re-receive (and reprocess!) the unacked message 

In fact, part of the contract of receive() for AUTO_ACK is that
the ACK has been successfully done such that when the client
does processing on the message, it knows that it won't get the message again.

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