[rabbitmq-discuss] Unbinding when not bound

Thu May 6 17:33:49 BST 2010

Hi,

Yep, I decided on the last option. ;)

Thanks for the help

Roaan

On 6 May 2010 16:24, Emile Joubert <emile at rabbitmq.com> wrote:

>
> Hi Roaan,
>
> If you are concerned about receiving messages asynchronously between
> binding and unbinding the queue then you could cancel the subscription
> first. Be aware that messages may still end up in the queue, even if they
> are not delivered. It would of course be preferable to avoid the entire
> sequence (cancel subscription, bind, unbind) if there was no binding in the
> first place.
>
> Another approach is to allow the exception to occur and recover from it by
> re-establishing the connection.
>
>
> -Emile
>
>
>
>
> Roaan Vos wrote:
>
>> Hi,
>>
>> On second thought, I don't think that will work.
>>
>> If I first do the binding, the client will likely receive data he didn't
>> intend before being able to remove the binding.
>>
>> Since consuming messages off of the queue is happening asynchronously,
>> while the bind/unbind happens on a different connection I think the above is
>> quite possible.
>>
>> Thanks
>>
>> Roaan
>>
>>
>> On 6 May 2010 13:20, Emile Joubert <emile at rabbitmq.com <mailto:
>> emile at rabbitmq.com>> wrote:
>>
>>
>>    Hi Roaan,
>>
>>    The broker is required to raise a connection exception if an unbind
>>    fails, so you are describing expected behaviour.
>>
>>    Duplicate bindings will be ignored, so you can prevent the exception
>>    by performing a (possibly duplicate) binding immediately prior to
>>    unbind.
>>
>>    The client is expected to keep track of bindings under normal
>>    circumstances though. I assume this is impossible in your case - can
>>    you explain why?
>>
>>    -Emile
>>
>>    Roaan Vos wrote:
>>
>>        Hi,
>>
>>                 I currently allow clients to “bind” and “unbind” to
>> various
>>        topics as needed using the .net client.
>>
>>        However, when the client “unbinds” without first having done a
>>        bind, RabbitMQ throws an exception and the connection seems to
>>        disappear.
>>
>>        Is there a way for it to keep the connection (or not throw an
>>        exception)?
>>
>>                 Thanks
>>
>>                 Roaan
>>
>>
>>
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>
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