[rabbitmq-discuss] there is a Consumer connected?

[Alexander Ward]

You can also check to see if a queue exists by doing a passive declare.
Since your queue is non-durable, if there are no consumers connected to it,
it won't exist.

To answer Simon's question, I do this in order to route requests to a
specific machine/consumer cluster by declaring a queue with the name of the
machine which is consuming. I check to see if the queue exists first, and
if it does, I route the message to that queue (where there may be multiple
consumers on it), otherwise I send it to a general queue which is durable.
Essentially I'm using it to partition tasks based on their hardware/network
needs.

Cheers,
-Alex

On Mon, Jun 11, 2012 at 5:10 AM, Simon MacMullen <simon at rabbitmq.com> wrote:

> On 10/06/12 21:38, Yurisleidy Hernández Moya wrote:
>
>> The Producer can know if there is a Consumer connected to the queue
>> before sending the message?
>>
>
> To answer your question literally: yes, use the mgmt HTTP API.
>
> To answer your question slightly less literally, the point of a messaging
> system is to let producers and consumers become decoupled - why do you want
> the producer to know if there is a consumer around?
>
> Cheers, Simon
>
> --
> Simon MacMullen
> RabbitMQ, VMware
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