def bind(self, queue, exchange, routing_key='', nowait=True, arguments={},
             ticket=None, cb=None):
        '''
        bind to a queue.
        '''
        nowait = nowait and self.allow_nowait() and not cb

        args = Writer()
        args.write_short(ticket or self.default_ticket).\
            write_shortstr(queue).\
            write_shortstr(exchange).\
            write_shortstr(routing_key).\
            write_bit(nowait).\
            write_table(arguments)
        self.send_frame(MethodFrame(self.channel_id, 50, 20, args))

        if not nowait:
            self._bind_cb.append(cb)
            self.channel.add_synchronous_cb(self._recv_bind_ok)
bind to a queue.