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From "Ken Giusti (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PROTON-564) Messenger.work doesn't receive messages
Date Wed, 16 Apr 2014 14:38:15 GMT

    [ https://issues.apache.org/jira/browse/PROTON-564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13971478#comment-13971478
] 

Ken Giusti commented on PROTON-564:
-----------------------------------

The recv() method tells messenger how many messages it is allowed to receive.  Functionally,
calling recv() makes credit available to messenger.   Without calling recv(), no credit will
be made available in order to receive messages from the sender.

I agree the documentation is lacking in explaining this.

Not sure the difference in behavior between 0.6 and 0.7 - what is 'work' returning in these
cases?

> Messenger.work doesn't receive messages
> ---------------------------------------
>
>                 Key: PROTON-564
>                 URL: https://issues.apache.org/jira/browse/PROTON-564
>             Project: Qpid Proton
>          Issue Type: Bug
>    Affects Versions: 0.6, 0.7
>         Environment: Fedora 19, Python 2.7.5
>            Reporter: Justin Ross
>
> Sink:
> {noformat}
> from proton import Messenger, Message
> msgr = Messenger()
> msgr.start()
> try:
>     msgr.subscribe("amqp://~0.0.0.0:50000")
>     msg = Message()
>     while True:
>         print "Tick; incoming={}".format(msgr.incoming)
>         msgr.work()
>         # msgr.recv() XXX
>  
>         for i in range(msgr.incoming):
>             msgr.get(msg)
>             print(msg)
> finally:
>     msgr.stop()
> {noformat}
> Source:
> {noformat}
> from proton import Messenger, Message
> msgr = Messenger()
> msgr.start()
> try:
>     msg = Message()
>     msg.address = "amqp://0.0.0.0:50000/test"
>     for i in range(10):
>         print "Tick {}".format(i)
>         msg.body = "Message {}".format(i)
>         msgr.put(msg)
>         msgr.send()
> finally:
>     msgr.stop()
> {noformat}
> On 0.6, it blocks on one of the work calls with incoming always 0.  On 0.7, it keeps
looping through work calls with incoming always 0.  The source sends nothing.
> Note the XXX bit in the sink.  If you uncomment that.  The sink consumes the messages.
> The python API documentation says the following:
> {noformat}
> Sends or receives any outstanding messages queued for a Messenger. This will block for
the indicated timeout. This method may also do I/O work other than sending and receiving messages.
For example, closing connections after messenger.stop() has been called.
> {noformat}
> Based on that, I expect that I should not need to call recv.



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