伪异步I/O

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采用线程池和任务队列可以实现一种叫做伪异步的I/O通信框架。

当有新的客服端接入时，客户端的Socket封装成一个Task(该任务实现java.lang.Runnable接口)投递到后端的线程池进行处理，JDK的线程池维护一个消息队列和N个活跃线程，对消息队列进行处理。线程池设置消息队列的大小和最大线程数因此他占用的资源是可控的，无论多少客户并发访问都不导致资源耗尽和宕机。

首先创建一个服务器处理类的线程池，当收到新的客服端时,将Socket 封装成一个Task，然后调用execute方法执行，从而避免每一次连接都新建一个线程

package com.demo.Server;import java.util.concurrent.ArrayBlockingQueue;import java.util.concurrent.ExecutorService;import java.util.concurrent.ThreadPoolExecutor;import java.util.concurrent.TimeUnit;/** * Created by jmh on 2017/3/27. */public class TimeServerHandlerExecutePool {    private ExecutorService executor;    public TimeServerHandlerExecutePool(int maxPoolSize,int queueSize){        executor = new ThreadPoolExecutor(Runtime.getRuntime().availableProcessors(),                maxPoolSize,120L, TimeUnit.SECONDS,                new ArrayBlockingQueue<Runnable>(queueSize));    }    public void execute(Runnable task){        executor.execute(task);    }}

服务端

package com.demo.Server;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;/** * Created by jmh on 2017/3/27. */public class TimeServer01 {    public static void main(String[] args) throws IOException {        int port = 8080;        if (args != null && args.length > 0) {            try {                port = Integer.valueOf(args[0]);            } catch (Exception e) {            }        }        ServerSocket server = null;        try {            server = new ServerSocket(port);            System.out.println("The time server is start in port:" + port);            Socket socket = null;            TimeServerHandlerExecutePool singleExecutor = new TimeServerHandlerExecutePool(50, 10000);//创建I/O任务线程池            while (true) {                socket = server.accept();                singleExecutor.execute(new TimeServerHandler(socket));            }        } finally {            if (server != null){                System.out.println("The time server close");                server.close();                server = null;            }        }    }}

好了不早了，每天保持看一点新知识！

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