[rabbitmq-discuss] Question about RabbitMQ "Presence Exchange" Plugin

Tue Oct 30 04:27:05 GMT 2012

Hi Tony,

after upgrading to RabbitMQ 2.8.6 from 2.8.5, presence-exchange plugin 
doesn't work. Is there any chance to fix it?

Thank you,

Oldrich

Dne pátek, 3. února 2012 5:12:14 UTC-8 Tony Garnock-Jones napsal(a):
>
> On 3 February 2012 06:09, Emile Joubert <em... at rabbitmq.com <javascript:>>wrote:
>
>> On 03/02/12 09:35, Liuzhuofu wrote:
>> > 1. What's the behavier of "x-presence" like? direct, fanout or topic?
>> None of those: the presence exchange is a different kind of exchange
>> that drops messages that are published to it. Instead it generates
>> messages when queues bind and unbind.
>>
>
> There's also more detailed discussion of this in the README, 
> https://github.com/tonyg/presence-exchange#readme.
>  
>
>> > 2. One "x-presence" exchange can only get the event that the binding
>> > changes on this exchanges, other bindings on other exchanges, it can not
>> > monitor, am I right?
>> It only produces notifications of binding on the local exchange, not
>> other exchanges.
>>
>
> For the avoidance of doubt, this should get you to where you need to be: 
> clients, when they connect, should bind a temporary (autodelete) queue to a 
> distinguished presence exchange for your application. If they crash, suffer 
> heartbeat failure, or otherwise disconnect, the temporary queue will be 
> deleted, and as a consequence the binding to the presence exchange will be 
> removed, the fact of which will then be broadcast to the presence listeners 
> attached to that exchange.
>
> Regards,
>   Tony
> -- 
> Tony Garnock-Jones
> tonygarn... at gmail.com <javascript:>
> http://homepages.kcbbs.gen.nz/tonyg/
>
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