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From "Chuck Rolke (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (QPID-4635) C++ Broker headerExchange misuses CopyOnWriteArray
Date Mon, 05 Aug 2013 14:56:48 GMT

     [ https://issues.apache.org/jira/browse/QPID-4635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Chuck Rolke resolved QPID-4635.

    Resolution: Not A Problem
> C++ Broker headerExchange misuses CopyOnWriteArray
> --------------------------------------------------
>                 Key: QPID-4635
>                 URL: https://issues.apache.org/jira/browse/QPID-4635
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Broker
>    Affects Versions: 0.20
>            Reporter: Chuck Rolke
> Current usage of CopyOnWriteArray  (COWA) is:
> DirectExchange.h:  typedef CopyOnWriteArray<Binding::shared_ptr> Queues;
> FanOutExchange.h:  typedef CopyOnWriteArray<Binding::shared_ptr> BindingsArray;
> HeadersExchange.h: typedef qpid::sys::CopyOnWriteArray<BoundKey> Bindings;
> Direct and FanOut exchanges keep share_ptrs in the array but Headers puts an actual object.
> This is NOT an issue for the route() function that takes a snapshot of the array since
the snapshot returns a shared_ptr to the array. 
> It is probably an issue when COWA adds or removes an element from the kept array and
copies of the array are made with no effort to delete the copied objects that are going out
of scope.
> If nothing else certain COWA functions require an operator== function for the HeadersExchange
BoundKey that the other exchanges do not require.

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