'''
Created on 06.03.2016

@author: wn
'''


import Queue

class BrokerException(Exception): pass

class BrokerDuplicateIdException(BrokerException): pass

class BrokerNotSubscribedException(BrokerException): pass

class BrokerOverflowException(BrokerException): pass


class Broker(object):
    def __init__(self):
        self.outQueues = {}
        self.inQueue = Queue.Queue
        
    def subscribe(self, name):
        if self.outQueues.has_key(name):
            raise BrokerDuplicateIdException()
        self.outQueues[name] = Queue.Queue()
    
    def unsubscribe(self, name):
        try:
            del self.outQueues[name]
        except KeyError:
            raise BrokerNotSubscribedException
    
    def get(self, name):
        try:
            return self.outQueues[name].get()
        except KeyError:
            raise BrokerNotSubscribedException
        
    def put(self, msg):
        try:
            for q in self.outQueues.values():
                q.put_nowait(msg)
        except Queue.Full: