[rabbitmq-discuss] JAVA client / non daemon threads / shutdown hook

Fri May 18 15:47:25 BST 2012

Hi,

I'm using JAVA client for RabbitMQ (com.rabbitmq:amqp-client:2.8.1) to 
write a "jar component" capable of sending messages for some legacy system. 
The idea is to wrap all code that maintain the connection inside my 
component. This way, the client software deals only with very simple 
methods like "post" and is not aware of any connection handling. The 
connect/reconnect code is written and hidden from the legacy system.

The problem I have faced is that Java client creates "behind the scene" 
some threads to manage connection - like:
         lines 299-301 of AMQConnection class.
        // start the main loop going
        new MainLoop("AMQP Connection " + getHostAddress() + ":" + 
getPort()).start();
        // after this point clear-up of MainLoop is triggered by closing 
the frameHandler.

Unfortunatelly, those threads aren't "daemon" threads. So, when main 
application ends and appropriate connection closing not occurs, the VM 
won't terminate. My approach was to add some shutdown hook to close 
RabbitMQ connections if it is live inside my "jar component". But, due to 
those non-daemon threads, VM is not going ever to be terminated and 
shutdown hooks fired.

It is a question to RabbitMQ driver developers, if the internal threads 
could be fired as daemon threads, could it be done in future releases?
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