[rabbitmq-discuss] New to AMQP - Who Declares Exchange

Wed Sep 3 01:35:11 BST 2008

Yes it does.  Thank you.  So, then it makes sense for both the
publisher and consumer to both declare the exchange.

Thanks,
Bradford

On Tue, Sep 2, 2008 at 8:29 PM, Ben Hood <0x6e6562 at gmail.com> wrote:
> Bradford,
>
> On Wed, Sep 3, 2008 at 12:30 AM, newps <fingermark at gmail.com> wrote:
>>
>> I'm interested in creating a topic exchange.  Which entity should declare the
>> exchange:  the publisher or subscriber?  And why?
>
> Not wanting to be overly theoretical, but the AMQP working group is
> now moving to a more formal definition of declarations that mean that
> they have the same semantics as an assertion.
>
> So by saying declare queue q  or declare exchange x, you are
> effectively saying "I assert the existence of object o, if it does not
> exist, make it so".
>
> Publishers need to write to somewhere.
>
> Consumers need to have queues bound to something.
>
> So both sides are only interested in the mere existence of the thing
> they need to do their job, not whether they or some other guy
> originally initiated that object's creation.
>
> Does that answer your question?
>
> Ben
>