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https://issues.apache.org/jira/browse/SYNAPSE-527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12693589#action_12693589
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Asankha C. Perera commented on SYNAPSE-527:
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I opened AXIS2-4196 [AxisEngine meddles with concerns of the transports, and
creates a thread when sending out a message] a couple of months back to fix
this in Axis2. Although this is one of the core classes of Axis2, a full review
and fix is needed and the TransportNonBlockingInvocationWorker removed. Another
critical issue is the Axis2 definition of a client and server side.. With
Synapse, we are both, and this causes a lot of issues too
> Transports use TRANSPORT_NON_BLOCKING in an incorrect way
> ---------------------------------------------------------
>
> Key: SYNAPSE-527
> URL: https://issues.apache.org/jira/browse/SYNAPSE-527
> Project: Synapse
> Issue Type: Bug
> Components: Transports
> Affects Versions: 1.2
> Reporter: Andreas Veithen
> Priority: Minor
>
> The TRANSPORT_NON_BLOCKING property is set on the message contexts for
> incoming messages by ServerWorker#createMessageContext (NIO HTTP transport)
> and AbstractTransportListener#createMessageContext. When the message is sent
> out, Synapse copies this property over to the message context for the
> outgoing message. This in turn has an impact on the threading behavior when
> the message is sent: depending on the value of TRANSPORT_NON_BLOCKING, the
> <send> mediator (more precisely the OperationClient) will invoke the outgoing
> transport in a separate thread. It is not clear why the transport that
> handles the incoming request should determine the threading behavior of the
> transport that sends the outgoing request to the target service.
> See also http://markmail.org/message/6iuslkueny24po73
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