Looking for Python example of acknowledging messages

[RobR <ro...@rad-con.com>]

I am beginning to do my homework, and I think I have a basic idea of the
difference between a topic and a queue.  Since my current task is to send
messages to a queue (or a topic), I don't care how the message will be
received.  That's our client's responsibility.

But I remain curious.  I'd like to see the load-balancing feature of a queue
in action.  So, I'd like to write a consumer that reads a message, logs it,
and acknowledges it five seconds later.  Ten instances of this consumer
would be running.  A publisher would send a message every second.  I should
see the messages get distributed among all of the consumers (or at least
five of them).  

This would be easy, except that I can't find any examples of reading and
acknowledging messages in Python, and I've never written anything in Java. 
The only examples I have found illustrate writing to and reading from
topics.  Can someone point me to a Python example that would be a good
starting point?  Or at least tell me what package I need to use that would
allow me to create a Session object?  I've only got the stomppy package, and
that doesn't seem to have what I need.

Thanks very much!

RobR



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Re: Looking for Python example of acknowledging messages

[artnaseef <ar...@artnaseef.com>]

Good questions.  For Perl and Python, I'm unsure; I know STOMP works with
them.  Of course, an openwire implementation will open up a lot of ActiveMQ
features, but I can't speak to the state of such solutions.

Maybe we'll get lucky and hear from someone with more experience in the area
;-).



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Re: Looking for Python example of acknowledging messages

[RobR <ro...@rad-con.com>]

Thanks very much!  I'll check them out.

I'm not wedded to the STOMP protocol, but I haven't yet succeeded in
understanding what I've read about the different protocols available.  What
protocol should I use for a simple example like this, and what Python
package should I use that implements it?

Thanks again!

RobR



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Re: Looking for Python example of acknowledging messages

[artnaseef <ar...@artnaseef.com>]

Have you seen this page?

http://stomp.github.io/implementations.html

It lists at least 2 Python solutions, one specific to ActiveMQ.  Note that
the the base STOMP protocol does not include acknowledgements; in perl,
that's the Net::Stomp module.  There is an enhancement that supports
acknowledgements, or "receipts" as Stomp calls them.  Here's an example perl
Net::Stomp::Receipt:

http://search.cpan.org/~huguei/Net-Stomp-Receipt-0.36/lib/Net/Stomp/Receipt.pm

If I find something for Python, I'll post it.



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