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From Toralf Lund <toralf.l...@pgs.com>
Subject Re: Reusing messaging::Sender vs creating every time
Date Fri, 29 Nov 2013 11:17:57 GMT
On 29/11/13 11:19, Gordon Sim wrote:
> On 11/29/2013 09:08 AM, Toralf Lund wrote:
>> Hi,
>> Just wondering, what gain is there in reusing Sender objects for the C++
>> Messaging API? I mean, over doing something like
>> qpid::messaging::Sender sender=session.createSender(address);
>> sender.send(message);
>> sender.close();
>> every time?
> The biggest problem is that the createSender() is synchronous, and may 
> in some cases involve more than one request to the broker. That adds 
> to the latency of the response.
That could be a bit of an issue.

>> I'm thinking about this in conjunction with a request-response type
>> setup where the reply address is specified via message::getReplyTo(), so
>> it's not entirely obvious how long the senders should be kept, if at
>> all, but I do know that the same "reply-to" will generally be used
>> several times.
>> Any thoughts?
> One option to reduce the number of distinct senders, and therefore 
> benefit more from caching, is to use a single a sender per exchange 
> (this is with AMQP 0-10) and just set the subject of the response 
> explicitly to match the required routing key.

It's not entirely clear to me how that might be done, though. I mean, 
the reply address is just a queue - there is no explicit binding or 

> The one issue here at present is that there is no way to create a 
> sender for the default exchange. That has been requested before (I 
> can't find a JIRA though) and it would perhaps be worth exploring. 
> Ideally it would be done in a way that would translate fairly 
> naturally to 1.0 as well.
Yes. Maybe this is what I'd need for the "simple queue" address?

> However, if you are able to control the types of reply-addresses you 
> use (e.g. amq.direct/# where # will be expanded to a uuid),

Yep. I'm still at a stage where I can easily change the addressing scheme.

So, in this setup, I'd use the "#" bit as subject?

- Toralf

> then you could cut down on the distinct number of senders needed, 
> making caching more likely to help.
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