Dynamic queue creation with RabbitMQ

Question

I\'ve been learning RabbitMQ various topologies, however, I couldn\'t find any reference to dynamic queue creation (aka Declare Queue) emitted from a producer. The idea woul

Answer 1

Essentially, what you want to do is use RabbitMQ to buffer messages waiting in a set of queues (which is what a message queuing system does by definition). :)

Assuming you know what your queues are from the consuming side, you won't have any issues. There is no constraint that a producer can't create a queue. As a caveat, when queues expire, all messages in the queue are discarded (or optionally, they can be set to go to a dead-letter queue).

What code have you tried?

Edit

Upon further clarification (from your comment) - you are looking for "wildcard consuming" vs wildcard publishing. RabbitMQ does not support such a topology at the present time (this post asks for a similar feature).

What you would need to do is periodically enumerate the queues (using the RabbitMQ API); following that, your app could decide which ones to consume from. When a queue is deleted, the consumer is automatically closed.

Special Note It should be understood that what is being asked here is an anti-pattern. The typical behavior of a system using queues is to route messages to queues based upon content. Thus, a properly-orchestrated system would have a set of workers operating on one or more statically-defined queues. Different workers may take different queues, depending upon specialization. When a series of interactions results in messages being published to the queue, the workers assigned to the queues will handle the messages in a first-come-first-served fashion (but, as this post discusses, order cannot be guaranteed with multiple consumers). The desired system behavior then emerges as a composition of workers performing various functions operating on queues.