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https://issues.apache.org/jira/browse/QPID-5970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14089198#comment-14089198
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Rob Godfrey commented on QPID-5970:
-----------------------------------
Change also modifies AbstractServerMessageImpl to throw an exception when
attempting to take a new reference to a message which has already been
dereferenced. This helps to ensure that requesting the arrival time for a
message does not result in meta-data not found exceptions where the message has
been removed from the store.
Before accessing message data, a thread should always ensure that it has a
reference to the message.
> [Java Broker] Expose "age of oldest message on queue" to management apis
> ------------------------------------------------------------------------
>
> Key: QPID-5970
> URL: https://issues.apache.org/jira/browse/QPID-5970
> Project: Qpid
> Issue Type: Improvement
> Components: Java Broker
> Reporter: Rob Godfrey
> Assignee: Rob Godfrey
> Fix For: 0.29
>
>
> The java broker currently provides alerting when the oldest message on a
> given queue goes above a certain threshold. We should add the
> "oldestMessageAge" as a statistic on the Queue model and also calculate it
> correctly for priority and sorted queues (currently it takes the age of the
> message at the head of the queue which is not correct for non FIFO queues)
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