def choice(self, subscribers, message):
if not subscribers:<EOL><INDENT>return None<EOL><DEDENT>return random.choice(subscribers)<EOL>
Chooses a random connection from subscribers to deliver specified message.

@param subscribers: Collection of subscribed connections to destination. 
@type subscribers: C{list} of L{coilmq.server.StompConnection}

@param message: The message to be delivered. 
@type message: L{stompclient.frame.Frame}

@return: A random subscriber from the list or None if list is empty.
@rtype: L{coilmq.server.StompConnection}