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+/*
+* 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.
+*/
+
+using System;
+using System.Configuration;
+using System.IO;
+using System.Text;
+using System.Threading;
+using org.apache.qpid.client;
+using org.apache.qpid.transport;
+
+namespace org.apache.qpid.example.pubsub
+{
+ /// <summary>
+ /// This program is one of two programs designed to be used
+ /// together. These programs use the topic exchange.
+ ///
+ /// Publisher:
+ ///
+ /// Publishes to a broker, specifying a routing key.
+ ///
+ /// Listener (this program):
+ ///
+ /// Reads from a queue on the broker using a message listener.
+ ///
+ /// </summary>
+ internal class Listener
+ {
+ public static int _count = 4;
+
+ private static void Main(string[] args)
+ {
+ string host = ConfigurationManager.AppSettings["Host"];
+ int port = int.Parse(ConfigurationManager.AppSettings["Port"]);
+ string virtualhost = ConfigurationManager.AppSettings["VirtualHost"];
+ string username = ConfigurationManager.AppSettings["Username"];
+ string password = ConfigurationManager.AppSettings["Password"];
+
+ Client connection = new Client();
+ try
+ {
+ connection.Connect(host, port, virtualhost, username, password);
+ IClientSession session = connection.CreateSession(50000);
+
+ //--------- Main body of program --------------------------------------------
+
+ lock (session)
+ {
+ Console.WriteLine("Listening for messages ...");
+ // Create a listener
+ prepareQueue("usa", "usa.#", session);
+ prepareQueue("europe", "europe.#", session);
+ prepareQueue("news", "#.news", session);
+ prepareQueue("weather", "#.weather", session);
+ while (_count > 0)
+ {
+ Monitor.Wait(session);
+ }
+ }
+
+ //---------------------------------------------------------------------------
+
+ connection.Close();
+ }
+ catch (Exception e)
+ {
+ Console.WriteLine("Error: \n" + e.StackTrace);
+ }
+ }
+
+ private static void prepareQueue(string queue, string routing_key, IClientSession session)
+ {
+ // Create a unique queue name for this consumer by concatenating
+ // the queue name parameter with the Session ID.
+ Console.WriteLine("Declaring queue: " + queue);
+ session.QueueDeclare(queue, Option.EXCLUSIVE, Option.AUTO_DELETE);
+
+ // Route messages to the new queue if they match the routing key.
+ // Also route any messages to with the "control" routing key to
+ // this queue so we know when it's time to stop. A publisher sends
+ // a message with the content "That's all, Folks!", using the
+ // "control" routing key, when it is finished.
+
+ session.ExchangeBind(queue, "amq.topic", routing_key);
+ session.ExchangeBind(queue, "amq.topic", "control");
+
+ // subscribe the listener to the queue
+ IMessageListener listener = new MessageListener(session);
+ session.AttachMessageListener(listener, queue);
+ session.MessageSubscribe(queue);
+ }
+ }
+
+ public class MessageListener : IMessageListener
+ {
+ private readonly IClientSession _session;
+ private readonly RangeSet _range = new RangeSet();
+
+ public MessageListener(IClientSession session)
+ {
+ _session = session;
+ }
+
+ public void MessageTransfer(IMessage m)
+ {
+ BinaryReader reader = new BinaryReader(m.Body, Encoding.UTF8);
+ byte[] body = new byte[m.Body.Length - m.Body.Position];
+ reader.Read(body, 0, body.Length);
+ ASCIIEncoding enc = new ASCIIEncoding();
+ string message = enc.GetString(body);
+ Console.WriteLine("Message: " + message + " from " + m.Destination);
+ // Add this message to the list of message to be acknowledged
+ _range.Add(m.Id);
+ if (message.Equals("That's all, folks!"))
+ {
+ Console.WriteLine("Shutting down listener for " + m.DeliveryProperties.GetRoutingKey());
+ Listener._count--;
+ // Acknowledge all the received messages
+ _session.MessageAccept(_range);
+ lock (_session)
+ {
+ Monitor.Pulse(_session);
+ }
+ }
+ }
+ }
+}