SingleThread,MutiThread and Thread Pool(2)

最新推荐文章于 2021-05-09 19:28:15 发布

最新推荐文章于 2021-05-09 19:28:15 发布 · 153 阅读

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#thread #Socket #多线程 #Go

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本文介绍了一种多线程服务端程序的设计方案。通过为每个客户端请求创建单独的线程来处理，确保了即使某一线程处理请求耗时较长也不会阻塞整个服务端。这种方式提高了服务端处理并发请求的能力。

接上上编著, 现在简单说说多线程服务端程序的实现。多线程服务端与单线程最主要的不同地方在于接收请求的循环:
[code]
......
public void run(){
synchronized(this){
this.runningThread = Thread.currentThread();
}
openServerSocket();

while(! isStopped()){
Socket clientSocket = null;
try {
clientSocket = this.serverSocket.accept();
} catch (IOException e) {
if(isStopped()) {
System.out.println("Server Stopped.") ;
return;
}
throw new RuntimeException(
"Error accepting client connection", e);
}
try {

new Thread(
new WorkerRunnable(
clientSocket, "Multithreaded Server")
).start();

} catch (IOException e) {
//log exception and go on to next request.
}
}

System.out.println("Server Stopped.");
}

......
public class WorkerRunnable implements Runnable{

protected Socket clientSocket = null;
protected String serverText = null;

public WorkerRunnable(Socket clientSocket, String serverText) {
this.clientSocket = clientSocket;
this.serverText = serverText;
}

public void run() {
try {
InputStream input = clientSocket.getInputStream();
OutputStream output = clientSocket.getOutputStream();
long time = System.currentTimeMillis();
output.write(("HTTP/1.1 200 OK\n\nWorkerRunnable: " +
this.serverText + " - " +
time +
"").getBytes());
output.close();
input.close();
System.out.println("Request processed: " + time);
} catch (IOException e) {
//report exception somewhere.
e.printStackTrace();
}
}
}

[/code]

由上代码可知，当某个处理请求时间太长时，并不会阻塞总个服务端(除非处理请求的占用全部的cpu，或者占用全部的带宽资源)。服务端可以花更少时间在serverSocket.accept()的调用上。