[rabbitmq-discuss] To know when a queue is empty from a Java client

[Florence Chabanois]

Hum indeed, this is literally our code...
So if declare_ok always refers to a new queue, we have no choice but use Runtime.exec("rabbitmqctl list_queues") if we want to know this kind of information on an existing queue? 
Cheers,Florence.


--- En date de : Jeu 26.8.10, Simon MacMullen <simon at rabbitmq.com> a écrit :

De: Simon MacMullen <simon at rabbitmq.com>
Objet: Re: [rabbitmq-discuss] To know when a queue is empty from a Java client
À: rabbitmq-discuss at lists.rabbitmq.com
Date: Jeudi 26 août 2010, 16h13

On 26/08/10 15:05, Florence
 Chabanois wrote:
> Thanks for your answer !
>
> We may be using it in a wrong way but so far, the method
> getMessageCount() always displays 0 message, when /"rabbitmqctl
> list_queues"/ displays 8 messages or keeps growing.
>
>     DeclareOk declareOk = channel.queueDeclare();

That's declaring a *new* server-named queue - which has 0 messages in 
it. Is that literally your code, or a paraphrase?

Cheers, Simon

>     System.out.println(">>>> MESSAGES : " + declareOk.getMessageCount());
>
>
> Cheers,
> Florence.
>
> --- En date de : *Jeu 26.8.10, Michael Bridgen /<mikeb at rabbitmq.com>/* a
> écrit :
>
>
>     De: Michael Bridgen <mikeb at rabbitmq.com>
>     Objet: Re: [rabbitmq-discuss] To know when a queue is empty from a
>     Java client
>     À: flocha2000-agile at yahoo.fr
>     Cc: rabbitmq-discuss at lists.rabbitmq.com
>     Date: Jeudi 26 août 2010, 15h24
>
>      > From a Java client we need to know when a queue is empty.
>      > Is there a way to know it via the Java api (or to know the number
>      > of messages in a queue).
>      >
>      > We would rather
 have another way than calling /"rabbitmqctl
>     list_queues"/
>      > via Runtime.exec()
>
>     A queue.declare_ok frame includes the number of messages on the
>     queue; so, you could send a passive queue.declare, and examine the
>     response.
>
>     Regards,
>     Michael
>
>
>
>
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> rabbitmq-discuss at lists.rabbitmq.com
> https://lists.rabbitmq.com/cgi-bin/mailman/listinfo/rabbitmq-discuss


-- 
Simon
 MacMullen
Staff Engineer, RabbitMQ
SpringSource, a division of VMware

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