[rabbitmq-discuss] 答复: A question about RabbitMQ "Presence Exchange" Plugin
majek04 at gmail.com
Wed Feb 8 14:04:04 GMT 2012
2012/2/8 Liuzhuofu <liuzhuofu at huawei.com>:
> Hi, Marek:
> I think you didn't catch my point.
> My question is : If a queue bind to a 'x-presence' exchange with a
> "not_empty" key and it hasn't bean subscribe by a process, when the vm of
> queue exit , the exchange can not receive a "unbind" message for the queue.
> But if the queue bind to 'x-presence' exchange with a "not_empty" key and it
> has subscribe by a process, when the vm of queue exit, the exchange can
> receive a "unbind" message for the queue.
What kind of queue do you have in mind? durable or exclusive or auto_delete?
You should see an 'unbind' message on a presence exchange,
when a queue gets unbind from this exchange
A queue can get 'unbind' during one of the following events:
- you manually call 'unbind'
- a queue gets deleted
The latter case, a queue getting deleted can happen in following cases:
- you manually call queue_delete
- a queue is 'exclusive' and a connection that created it gets closed
- a queue is 'auto-delete' and all the consumers stopped consuming (for example
last consumer connection got closed)
Please review the AMQP spec for details:
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