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From "Dexter Tad-y (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-1874) Added additional Stomp SUBSCRIBE ack mode for acknowledging out-of-order individual message-IDs
Date Wed, 30 Jul 2008 20:50:00 GMT
Added additional Stomp SUBSCRIBE ack mode for acknowledging out-of-order individual message-IDs
-----------------------------------------------------------------------------------------------

                 Key: AMQ-1874
                 URL: https://issues.apache.org/activemq/browse/AMQ-1874
             Project: ActiveMQ
          Issue Type: New Feature
          Components: Transport
         Environment: Ubuntu Hardy 8.04.1, Linux ig-dexter 2.6.24-20-generic #1 SMP Mon Jul
28 13:49:52 UTC 2008 i686 GNU/Linux
            Reporter: Dexter Tad-y
             Fix For: 5.2.0
         Attachments: stomp-client-individual.patch

Current Behavior:

   Given that a Stomp client SUBSCRIBEs to a queue with the ack mode set to 'client';

   Scenario 1:
   Some producer send messages and the Stomp Subscriber receives the ff. messages in order:
       Msg1
       Msg2
       Msg3

   ACK Msg1 will acknowledge just Msg1. This is a simple and obvious behavior.
   ACK Msg2,  ACK Msg3 should behave normal.

   ====

   Scenario 2:
   Some producer send messages and the Stomp Subscriber receives the ff. messages in order:
       Msg1
       Msg2
       Msg3
 
   Trying to do an ACK Msg2 will acknowledge both Msg1 and Msg2. Any attempt to ACK Msg1 will
result in an Unexpected ACK error frame.
   ACK Msg3 will succeed.

   ====

   Scenario 3:
   Again, some producer send messages and the Stomp Subscriber receives the ff. messages in
order:
       Msg1
       Msg2
       Msg3

   Trying to ACK Msg3 will acknowledge ALL messages at once. ACK Msg2 or Msg 1 will raise
an exception if attempted.


    ====

   The Stomp specs at http://stomp.codehaus.org/Protocol does not detail the ack behavior
nor does it recommend or hint anything.

Proposed Patch:

   Introduce a new ack mode in Stomp SUBSCRIBE header:

   In the attached patch, the chosen header is called 'client-individual'; to reflect that
ACKs are still client initiated PLUS "individual" to 
   declare that the client intends to acknowledge individual messages by message-id, not in
batches as with simple 'client' ack mode.

   Kindly suggest a another header name if you can think of a more appropriate one.

   References:

        https://issues.apache.org/activemq/browse/AMQ-1732


Thank you.

===========
Dexter Tad-y

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