/* | |
* 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.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 = args.Length > 0 ? args[0] : "localhost"; | |
int port = args.Length > 1 ? Convert.ToInt32(args[1]) : 5672; | |
Client connection = new Client(); | |
try | |
{ | |
connection.connect(host, port, "test", "guest", "guest"); | |
ClientSession 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, ClientSession 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 ClientSession _session; | |
private readonly RangeSet _range = new RangeSet(); | |
public MessageListener(ClientSession 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); | |
} | |
} | |
} | |
} | |
} |