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From "Robbie Gemmell (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (QPID-3219) some logic used to find current/available messages may return a QueueEntry currently in the dequeued state.
Date Tue, 07 Jun 2011 11:19:58 GMT

     [ https://issues.apache.org/jira/browse/QPID-3219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Robbie Gemmell resolved QPID-3219.

    Resolution: Fixed

Patch applied.

> some logic used to find current/available messages may return a QueueEntry currently
in the dequeued state.
> -----------------------------------------------------------------------------------------------------------
>                 Key: QPID-3219
>                 URL: https://issues.apache.org/jira/browse/QPID-3219
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker
>    Affects Versions: 0.5, 0.6, 0.7, 0.8, 0.9, 0.10
>            Reporter: Robbie Gemmell
>            Assignee: Robbie Gemmell
>             Fix For: 0.11
>         Attachments: QPID-3219-adds-dequeued-checks.patch
> Some logic used to find current/available messages may incorrectly gather/return a QueueEntry
in the dequeued state.
> The QueueEntry state model has an intermediate 'dequeued' state that the entry will enter
before being disposed of and moved to the 'deleted' state.
> At present, most logic dealing with QueueEntry presence/availability checks only that
they aren't deleted or that they can be acquired (typically both are done in the latter case,
but checking the deletion is unnecessary in this case since the acquire attempt would fail
if it were deleted). There is no intended path for a queue entry to transition from being
dequeued to anything other than the deleted state, and so any logic inspecting for current/available
messages should also disregard entries in the dequeued state.
> Areas known to be affected by the issues include the various SimpleAMQQueue#'getMessagesOnTheQueue'
type operations in  used for tasks such as viewing / copying / moving messages via JMX, and
also the QueueEntryImpl#getNext method used to traverse the QueueEntryList during delivery

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