[rabbitmq-discuss] How to get notification when a queue becomes non-empty without removing any messages?

[vitaly]

I need to be able to spawn a consumer process for a queue when that queue 
becomes non-empty. The trigger needs to happen in an event-driven way, 
without polling, and without removing any messages from that queue. Is this 
possible with AMQP/RabbitMQ and how?  I am coding in Python.

Thank you,
Vitaly
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