[jira] [Created] (QPID-4635) C++ Broker headerExchange misuses CopyOnWriteArray

["Chuck Rolke (JIRA)" <ji...@apache.org>]

Chuck Rolke created QPID-4635:
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             Summary: 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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