using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace Common
{
///<summary>
/// @author: gxjiang
/// @date : 2011/4/7
/// @description : 提供一个专有的线程封装，使得这个线程可以去处理一系列的事情。
///</summary>
publicclass ExclusiveThread<T>
{
///<summary>
/// 任务列表
///</summary>
private Queue<T> TaskQueue =new Queue<T>();
///<summary>
/// 是否被停止
///</summary>
privatebool IsStopped =false;
///<summary>
/// 处理的线程
///</summary>
private Thread InnerThread;
///<summary>
/// 出队列时处理方法
///</summary>
private DequeueHandler CallBack;

publicdelegatevoid DequeueHandler(T item);
///<summary>
/// 线程停止事件
///</summary>
publicevent EventHandler Stopped;

public ExclusiveThread(DequeueHandler callBackFunc)
{
this.CallBack = callBackFunc;
this.CreateInnerThread();
}

privatevoid ThreadFunction()
{
while (true)
{
lock (this.TaskQueue)
{
if (this.TaskQueue.Count >0)
{
T item =this.TaskQueue.Dequeue();
this.OnDequeue(item);
}
else
{
if (this.IsStopped)
this.OnStop();
break;
}
}

　　　　　　　　　Thread.Sleep(100);
}
}

privatevoid OnStop()
{
EventHandler handler = Stopped;
if (handler !=null)
handler(this, EventArgs.Empty);
}

privatevoid OnDequeue(T item)
{
if (this.CallBack !=null)
this.CallBack(item);
}

privatevoid AbortInnerThread()
{
try
{
if (this.InnerThread !=null)
this.InnerThread.Abort();
}
catch
{
}
}

privatevoid CreateInnerThread()
{
this.InnerThread =new Thread(new ThreadStart(ThreadFunction));
}

privatevoid InnerThreadAction()
{
if (this.InnerThread.ThreadState == ThreadState.Unstarted) this.InnerThread.Start();
elseif (this.InnerThread.ThreadState == ThreadState.Stopped ||this.InnerThread.ThreadState == ThreadState.Aborted)
{
this.CreateInnerThread();
this.InnerThread.Start();
}
}

///<summary>
/// 增加处理任务
/// 若线程么有启动则启动
/// 若已经启动就添加到任务队列中
/// 若任务处理完了，则挂起线程
///</summary>
///<param name="item">处理任务</param>
publicvoid Add(T item)
{
if (this.IsStopped)
thrownew ExclusiveThreadException("此线程已经停止，不可以再添加任务。");
lock (this.TaskQueue)
{
this.TaskQueue.Enqueue(item);
this.InnerThreadAction();
}
}

///<summary>
/// 停止处理任务,触发Stopped事件
///</summary>
publicvoid Stop()
{
lock (this.TaskQueue)
{
this.IsStopped =true;
if (this.TaskQueue.Count ==0&&this.InnerThread.ThreadState == ThreadState.Stopped)
this.OnStop();
}
}

///<summary>
/// 重新开始任务,之后调用[Add]方法加任务
///</summary>
publicvoid Resume()
{
this.IsStopped =false;
}
}

///<summary>
/// 自定义异常
///</summary>
publicclass ExclusiveThreadException : ApplicationException
{
public ExclusiveThreadException():base() { }
public ExclusiveThreadException(string msg) : base(msg) { }
public ExclusiveThreadException(string msg, Exception innerException) : base(msg, innerException) { }
}

}