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https://issues.apache.org/jira/browse/QPID-1800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Ritchie updated QPID-1800:
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Status: Ready To Review (was: In Progress)
> Moving/Copying messages via Management Console will break the reference
> counting model.
> ---------------------------------------------------------------------------------------
>
> Key: QPID-1800
> URL: https://issues.apache.org/jira/browse/QPID-1800
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Reporter: Martin Ritchie
> Assignee: Martin Ritchie
> Fix For: 0.5
>
>
> Summary:
> The new TransactionLog interface takes a list of queues upon which to enqueue
> a new message.
> This approach allows us to do away with reference counting for messages that
> are only on the one queue, but it does require that the all the queues the
> message should be enqueued upon are sent via a single enqueue.
> The management console cannot know what queues the messages are on once
> delivery has completed so there will need to be additional synchronisation to
> correctly enqueue a live message on to a new queue.
> One approach that will work for move would be to check if we have a list of
> enqueues for the message and whilst holding the lock for that list add the
> new queue to it.
> For copy what we can simply use the normal enqueue logic an ensure that the
> new enqueue call includes the current queue and the new queue. That way if we
> don't already have a reference to this queue then it will gain one. If
> delivery is still proceeding here though then it is conceivable that the
> message is acked and deleted before the copy completes. This would be ok as
> you would get an error, the problem exists where we do the enqueue and the
> dequeue call has been made before our enqueue. If we only had the message on
> the one queue there would be no way to guarentee that the enqueue didn't
> cause the message to be left on the queue even though the client just acked
> the message.
> Is that clear? I can add more details if required.
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