#!/usr/bin/env python # # Licensed to the Apache Software Foundation (ASF) under one # or more contributor license agreements. See the NOTICE file # distributed with this work for additional information # regarding copyright ownership. The ASF licenses this file # to you under the Apache License, Version 2.0 (the # "License"); you may not use this file except in compliance # with the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, # software distributed under the License is distributed on an # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY # KIND, either express or implied. See the License for the # specific language governing permissions and limitations # under the License. # """ listener.py This AMQP client reads messages from a message queue named "message_queue". """ import qpid import sys import os from qpid.util import connect from qpid.connection import Connection from qpid.datatypes import Message, RangedSet, uuid4 from qpid.queue import Empty # from time import sleep #----- Message Receive Handler ----------------------------- class Receiver: def __init__ (self): self.finalReceived = False def isFinal (self): return self.finalReceived def Handler (self, message): content = message.body session.message_accept(RangedSet(message.id)) print content if content == "That's all, folks!": self.finalReceived = True #----- Initialization -------------------------------------- # Set parameters for login host="127.0.0.1" port=5672 user="guest" password="guest" # If an alternate host or port has been specified, use that instead # (this is used in our unit tests) if len(sys.argv) > 1 : host=sys.argv[1] if len(sys.argv) > 2 : port=int(sys.argv[2]) # Create a connection. socket = connect(host, port) connection = Connection (sock=socket, username=user, password=password) connection.start() session = connection.session(str(uuid4())) #----- Read from queue -------------------------------------------- # Create a server-side queue and route messages to it. # The server-side queue must have a unique name. Use the # session id for that. server_queue_name = session.name session.queue_declare(queue=server_queue_name) session.exchange_bind(queue=server_queue_name, exchange="amq.fanout") # Create a local queue to receive messages from the server-side # queue. local_queue_name = "local_queue" local_queue = session.incoming(local_queue_name) # The local queue name identifies the client-side queue. local_queue_name = "local_queue" local_queue = session.incoming(local_queue_name) # Call message_subscribe() to tell the broker to deliver messages # from the AMQP queue to this local client queue. The broker will # start delivering messages as soon as local_queue.start() is called. session.message_subscribe(queue=server_queue_name, destination=local_queue_name) local_queue.start() receiver = Receiver () local_queue.listen (receiver.Handler) while not receiver.isFinal (): sleep (1) #----- Cleanup ------------------------------------------------ # Clean up before exiting so there are no open threads. # session.close()