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From "Ted Ross (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-4997) Dispatch - Thread safety issues in the usage of Proton
Date Tue, 06 Aug 2013 15:48:48 GMT

    [ https://issues.apache.org/jira/browse/QPID-4997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13730868#comment-13730868
] 

Ted Ross commented on QPID-4997:
--------------------------------

Rather than attempt to make the Proton objects thread-safe, the approach to fixing this problem
is to enqueue not just messages for delivery on a different connection but also state change
events (settlement, disposition change, etc.).

Previously, message deliveries were enqueued for delivery on a different thread but disposition
changes, settlement, and offered were done synchronously in the receiving thread.

As changed, all of the above are enqueued for asynchronous processing in a thread that has
the proper access to the target connection.
                
> Dispatch - Thread safety issues in the usage of Proton
> ------------------------------------------------------
>
>                 Key: QPID-4997
>                 URL: https://issues.apache.org/jira/browse/QPID-4997
>             Project: Qpid
>          Issue Type: Bug
>          Components: Qpid Dispatch
>            Reporter: Ted Ross
>            Assignee: Ted Ross
>
> Dispatch, being an intermediary, often needs to deal with activating and modifying multiple
links synchronously.  There are several Proton calls that are invoked on threads in violation
of the one-thread-at-a-time-per-connection rule.
> A mechanism needs to be put in place whereby delivery (settlement/disposition) and link
(flow/offer) can be safely scheduled for later processing on a "proper" thread.

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