[rabbitmq-discuss] Question about Queue Bind/Unbind
tonyg at lshift.net
Fri Apr 9 05:56:00 BST 2010
Alvaro Videla wrote:
> So far so good, but when I stop the app and then I say that the queue
> "usa" must be bound by the "usa.weather" routing key, nothing
> happens. the binding is not changed.
> Then I read the code of rabbit_exchange:add_binding/4 and it seems
> that it doesn't support overwriting the binding.
Queue.bind won't alter a binding, but it will add a new binding. It's
also idempotent, so two or more queue.binds with identical arguments
will act the same as just one.
So the following:
- queue.bind(binding_key = 'usa.news', queue = 'usa')
- queue.bind(binding_key = 'usa.weather', queue = 'usa')
will (should!) result in *two* bindings. The queue should then receive
messages published to the exchange with either usa.news or usa.weather.
You could also use 'usa.*', if you like, to pick up all USAish messages
with a single binding.
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