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<span style="font-size: 12px;">Sure, but then the contract becomes between the notifier and the client, presumably? I'm not as familiar with the notification system as I should be.</span>
</div><div><span style="font-size: 12px;"><br></span></div><div><span style="font-size: 12px;">I haven't written a ZeroMQ notifier yet, figuring that task would be better delayed until the move to openstack-common.</span></div>
<div><div><br></div>-- <br>Eric Windisch<div><br></div></div>
<p style="color: #A0A0A8;">On Wednesday, April 25, 2012 at 3:29 PM, Russell Bryant wrote:</p>
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<span><div><div><div>On 04/25/2012 03:22 PM, Eric Windisch wrote:</div><blockquote type="cite"><div><div>I've heard a few people mention pulling messages off the queue, or</div><div>communicating via RPC outside of the project, or outside of Python. In</div><div>theory, this sounds nice, but the RPC implementations are strictly</div><div>making sure that A can execute calls on target B and that responses get</div><div>back to A.</div><div><br></div><div>This has little to do with message queues, other than that message</div><div>queues are optionally supported. You shouldn't be peeking behind that</div><div>curtain. This is specific to each RPC mechanism and enforcing something</div><div>this early might be more problematic than you expect.</div></div></blockquote><div><br></div><div>I agree with you that any discussion of other things poking at the rpc</div><div>communications is broken and wrong.</div><div><br></div><div>The only case where it does make sense is notifications. In that case,</div><div>the fact that it's using rpc is just an implementation detail. If you</div><div>enable the rabbit notifier (should probably be renamed at some point),</div><div>there is a specific AMQP message exchange where external applications</div><div>are to receive notifications from nova.</div><div><br></div><div>This implementation detail means that this can also be used with zeromq</div><div>... though I'm not sure that makes sense. There would probably be a</div><div>notifier implementation specific to zeromq that could make better use of</div><div>that messaging model.</div><div><br></div><div>-- </div><div>Russell Bryant</div></div></div></span>
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