[rabbitmq-discuss] Exchange consumer declaration
mklishin at gopivotal.com
Fri Jun 13 00:42:02 BST 2014
On 13 June 2014 at 03:33:09, Larry Lewis (rabbitmq at jenolan.org) wrote:
> > When a LVC consumer is defined it needs to do a 'exchange_declare'
> but it needs to declare the exchange paramaters which is sub-optimal.
> A consumer should be able to use just the exchange name to derive
> the linkage. It should never be creating it (if it aint there that's
> an error). Why I am concerned is that as I create consumers of exchanges
> I do not want to be bothered with the settings of the exchange so
> that the code that creates the exchange is the only one that needs
> to worry about the attributes.
> Is there a way to acquire/specify the exchange 'read-only',
> without using the definition options that are in the 'exchange_declare()'
The feature you want is called passive declare (set passive = true).
It results in a channel exception if the exchange does not exist and no-op
(success) if it does.
You can also use exchange name without declaring it first: if you are sure it's
there, simply pass it to queue.bind and similar methods.
Software Engineer, Pivotal/RabbitMQ
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