Cannot remove an exchange if the same name is used by multiple bindings

[amybt]

If we have declared multiple direct exchanges with a same name, only different routing key then exchange->remove() will print an error in the RabbitMQ log. The pattern would be like in http://www.rabbitmq.com/tutorials/tutorial-four-python.html where multiple queues are binded to the same exchange. Check the "Multiple bindings" section in that tutorial. If we do exchange->remove() when in some app that exchange is not needed anymore, it cannot actually be removed from RabbitMQ if other apps are also using the same exchange name. Hence, even if we try to do exchange->deleteLater(), the destructor of QAMQP::Exchange will call remove() and we'll get the same behavior.

[amybt]

I believe that what we need is a function to declare an exchange without creating QAMQP::Exchange object

[mbroadst]

@amybt I believe the behavior of calling remove in the dtor is incorrect, I've corrected this in my fork qamqp-ng. You can look at the tutorials there as well in the "tutorials" folder, tutorial 4 from the rabbitmq site is implemented there.