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https://issues.apache.org/jira/browse/QPID-7618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15818858#comment-15818858
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Rob Godfrey commented on QPID-7618:
-----------------------------------
The other issue here is that I don't think that the code above will actually
remove the persistent record of the queue entry, only the in-memory copy
If we compare with what happens on tll expiry we see (in AbstractQueue.java)
{code}
boolean acquiredForDequeueing = node.acquireOrSteal(new Runnable()
{
@Override
public void run()
{
dequeueEntry(node);
}
});
if(acquiredForDequeueing)
{
_logger.debug("Dequeuing expired node {}", node);
// Then dequeue it.
dequeueEntry(node);
}
{code}
where dequeueEntry looks like:
{code}
private void dequeueEntry(final QueueEntry node)
{
ServerTransaction txn = new
AutoCommitTransaction(getVirtualHost().getMessageStore());
dequeueEntry(node, txn);
}
private void dequeueEntry(final QueueEntry node, ServerTransaction txn)
{
txn.dequeue(node.getEnqueueRecord(),
new ServerTransaction.Action()
{
public void postCommit()
{
node.delete();
}
public void onRollback()
{
}
});
}
{code}
the above code also copes with the case where the node in question is
temporarily locked - it seems like the ring queue patch will just busy loop
until it can acquire the oldest node on the queue... I'm not sure if that is
the best strategy - although this may be a hard problem to solve.
> Ring policy type
> ----------------
>
> Key: QPID-7618
> URL: https://issues.apache.org/jira/browse/QPID-7618
> Project: Qpid
> Issue Type: New Feature
> Components: Java Broker
> Affects Versions: qpid-java-6.1.1, qpid-java-7.0
> Reporter: Tomas Vavricka
> Labels: policy-type, queue, ring
> Attachments: 0001-QPID-7569-Ring-policy-type.patch
>
>
> It would be good if Java Broker will support ring policy.
> Ring policy - delete oldest message(s) when queue capacity is reached
> Queue capacity can be defined by maximum count of message and maximum size of
> messages (including header).
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