本文实例讲述了ActiveMQ在C#中的应用。,具体如下:
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,后面会有文章介绍。
1、去ActiveMQ官方网站下载最新版的ActiveMQ,网址:http://www.easck.com/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://www.easck.com/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-srcsrcmaincsharpTransportInactivityMonitor.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-5.3.1bin,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();
}
}
}
}










