ActiveMQ 是个好东东,不必多说。ActiveMQ提供多种语言支持,如Java, C, C++, C#, Ruby, Perl, Python, PHP等。由于我在windows下开发GUI,比较关心C++和C#,其中C#的ActiveMQ很简单,Apache提供NMS(.Net Messaging Service)支持.Net开发,只需如下几个步骤即能建立简单的实现。C++的应用相对麻烦些,稍后写文章介绍。
1、去ActiveMQ官方网站下载最新版的ActiveMQ,网址:http://activemq.apache.org/download.html 。我之前下的是5.3.1,5.3.2现在也已经出来了。
2、去ActiveMQ官方网站下载最新版的Apache.NMS,网址:http://activemq.apache.org/nms/download.html , 需要下载Apache.NMS和Apache.NMS.ActiveMQ两个bin包,如果对源码感兴趣,也可下载src包。这里要提醒一下,如果下载 1.2.0版本的NMS.ActiveMQ,Apache.NMS.ActiveMQ.dll在实际使用中有个bug,即停止ActiveMQ应用时会抛 WaitOne函数异常,查看src包中的源码发现是由于Apache.NMS.ActiveMQ-1.2.0-src\src\main\csharp \Transport\InactivityMonitor.cs中的如下代码造成的,修改一下源码重新编译即可。看了一下最新版1.3.0已经修复了这 个bug,因此下载最新版即可。
- private void StopMonitorThreads()
- {
- lock (monitor)
- {
- if (monitorStarted.CompareAndSet( true , false ))
- {
- AutoResetEvent shutdownEvent = new AutoResetEvent( false );
- // Attempt to wait for the Timers to shutdown, but don't wait
- // forever, if they don't shutdown after two seconds, just quit.
- this .readCheckTimer.Dispose(shutdownEvent);
- shutdownEvent.WaitOne(TimeSpan.FromMilliseconds(2000));
- this .writeCheckTimer.Dispose(shutdownEvent);
- shutdownEvent.WaitOne(TimeSpan.FromMilliseconds(2000));
- //WaitOne的定义:public virtual bool WaitOne(TimeSpan timeout,bool exitContext)
- this .asyncTasks.Shutdown();
- this .asyncTasks = null ;
- this .asyncWriteTask = null ;
- this .asyncErrorTask = null ;
- }
- }
- }
3、运行ActiveMQ,找到ActiveMQ解压后的bin文件夹:...\apache-activemq-5.3.1\bin,执行activemq.bat批处理文件即可启动ActiveMQ服务器,默认端口为61616,这可在配置文件中修改。
4、 写C#程序实现ActiveMQ的简单应用。新建C#工程(一个Producter项目和一个Consumer项目),WinForm或Console程 序均可,这里建的是Console工程,添加对Apache.NMS.dll和Apache.NMS.ActiveMQ.dll的引用,然后即可编写实现 代码了,简单的Producer和Consumer实现代码如下:
producer:
- using System;
- using System.Collections.Generic;
- using System.Text;
- using Apache.NMS;
- using Apache.NMS.ActiveMQ;
- using System.IO;
- using System.Xml.Serialization;
- using System.Runtime.Serialization.Formatters.Binary;
- namespace Publish
- {
- class Program
- {
- static void Main( string [] args)
- {
- try
- {
- //Create the Connection Factory
- IConnectionFactory factory = new ConnectionFactory( "tcp://localhost:61616/" );
- using (IConnection connection = factory.CreateConnection())
- {
- //Create the Session
- using (ISession session = connection.CreateSession())
- {
- //Create the Producer for the topic/queue
- IMessageProducer prod = session.CreateProducer(
- new Apache.NMS.ActiveMQ.Commands.ActiveMQTopic( "testing" ));
- //Send Messages
- int i = 0;
- while (!Console.KeyAvailable)
- {
- ITextMessage msg = prod.CreateTextMessage();
- msg.Text = i.ToString();
- Console.WriteLine("Sending: " + i.ToString());
- prod.Send(msg, Apache.NMS.MsgDeliveryMode.NonPersistent, Apache.NMS.MsgPriority.Normal, TimeSpan.MinValue);
- System.Threading.Thread.Sleep(5000);
- i++;
- }
- }
- }
- Console.ReadLine();
- }
- catch (System.Exception e)
- {
- Console.WriteLine("{0}" ,e.Message);
- Console.ReadLine();
- }
- }
- }
- }
consumer:
- using System;
- using System.Collections.Generic;
- using System.Text;
- using Apache.NMS;
- using Apache.NMS.ActiveMQ;
- using System.IO;
- using System.Xml.Serialization;
- using System.Runtime.Serialization.Formatters.Binary;
- namespace Subscribe
- {
- class Program
- {
- static void Main( string [] args)
- {
- try
- {
- //Create the Connection factory
- IConnectionFactory factory = new ConnectionFactory( "tcp://localhost:61616/" );
- //Create the connection
- using (IConnection connection = factory.CreateConnection())
- {
- connection.ClientId = "testing listener" ;
- connection.Start();
- //Create the Session
- using (ISession session = connection.CreateSession())
- {
- //Create the Consumer
- IMessageConsumer consumer = session.CreateDurableConsumer(new Apache.NMS.ActiveMQ.Commands.ActiveMQTopic( "testing" ),