[rabbitmq-discuss] Passive queue declaration and channel closure

Tue Feb 21 21:18:04 GMT 2012

Thanks Steve, that's pretty much what Simon had already clarified, and I
agreed that changing this behavior is not practical.
On Feb 21, 2012 2:24 PM, "Steve Powell" <steve at rabbitmq.com> wrote:

> Simone,
>
> Replies in-line below..
>
> I don't think this is likely to change in the near future, since it
> would be disruptive to most clients that use this.
>
> Steve Powell  (a happy bunny)
> ----------some more definitions from the SPD----------
> vermin (v.) Treating the dachshund for roundworm.
> chinchilla (n.) Cooling device for the lower jaw.
> socialcast (n.) Someone to whom everyone is speaking but nobody likes.
>
> On 16 Feb 2012, at 17:10, Busoli, Simone wrote:
>
> > Without relying on the management plugin I think the only way to do that
> is to
> > declare the queue as passive. At least with the .NET client and
> apparently the
> > Java client too, when the queue does not exist, besides throwing an
> exception,
> > the channel is closed as well. From the spec:
> >
> > If set, the server will reply with Declare-Ok if the queue already
> exists with
> > the same name, and raise an error if not. The client can use this to
> check
> > whether a queue exists without modifying the server state.
>
> The spec goes on to say:
>
>  The client MAY ask the server to assert that a queue exists without
> creating
>  the queue if not. If the queue does not exist, the server treats this as a
>  failure. Error code: not-found
>
> > There is no mention of channel closure, while the last sentence implies
> that
> > using the passive bit is indeed a way for a client to check queue
> existence, so
> > closing the channel when it doesn’t is a bit unexpected. That said, it’s
> not a
> > big deal to recreate the channel in such cases, but I’d appreciate your
> opinion.
> > Any chance this behavior can be changed in the client libraries?
>
> This is the mention of channel-closure -- an 'error' raised on the channel
> will
> close it.
>
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