知识大全 Asp.net异步如何提高服务器吞吐量

Posted 2022-07-16 知

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Codepublic class Handler :IHttpAsyncHandlerIHttpAsyncHandler 成员#region IHttpAsyncHandler 成员public IAsyncResult BeginProcessRequest(HttpContext context AsyncCallback cb object extraData)context Response Write( <p>Begin IsThreadPoolThread is + Thread CurrentThread IsThreadPoolThread+Thread CurrentThread ManagedThreadId + </p>\\r\\n );AsyncHandler hand = new AsyncHandler(cb context extraData);hand StartAsyncWork();return hand;public void EndProcessRequest(IAsyncResult result)

#endregionIHttpHandler 成员#region IHttpHandler 成员

public bool IsReusableget return false; public void ProcessRequest(HttpContext context)throw new NotImplementedException();#endregionpublic class AsyncHandler : IAsyncResultprivate bool _pleted;private Object _state;private AsyncCallback _callback;private HttpContext _context;public AsyncHandler(AsyncCallback callback HttpContext context Object state)_callback = callback;_context = context;_state = state;_pleted = false;

IAsyncResult 成员#region IAsyncResult 成员public object AsyncStategetreturn _state;

public System Threading WaitHandle AsyncWaitHandleget throw new NotImplementedException();

public bool CompletedSynchronouslyget return false;

public bool IsCompletedget return _pleted;

#endregion

public void StartAsyncWork()ThreadPool QueueUserWorkItem(new WaitCallback(StartAsyncTask) null);private void StartAsyncTask(Object workItemState)Thread Sleep( );//模拟IO_context Response Write( <p>Completion IsThreadPoolThread is + Thread CurrentThread IsThreadPoolThread + </p>\\r\\n );_context Response Write( Hello World from Async Handler! + Thread CurrentThread ManagedThreadId);_pleted = true;_callback(this);

　　这是Asp net中的异步处理 Asp net的异步处理目的就是要搞高服务器的接受请求的处理能力但有一点不明白使用异步处理时在BeginProcessRequest时会将处理当前请求的线程放回到线程池中放回到线程池中的此线程继续接受新的请求但是在StartAsyncWork这个时候同样会从当前线程池中获取一个线程继续处理这个IO 这样并不能提高服务器的吞吐量相反会在线程间切换浪费CPU时间和资源 Asp net异步处理就没有意义了（其实是有意义的）

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