Two-phase Termination 把玩具收拾好再去睡觉。_two phase termination 例子-优快云博客

本文介绍了一种用于确保线程安全关闭的技术——两阶段终止模式。该模式允许在线程停止前执行必要的清理工作，通过设置shutdown标志并响应中断来实现线程的优雅退出。

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字面翻译是“两阶段终止”，这个模式用来进行结束操作后，再终止线程。比如我们想停止一个线程，但是让他停止之前必须要做一些清理工作，这时候就需要用到two-phase termination模式。

public class TwoPhaseTerminationTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        System.out.println("main begin");

        try {
            CountupThread t = new CountupThread();
            t.start();

            Thread.sleep(10000);

            System.out.println("main: shutdownRequest");
            t.shutdownRequest();

            System.out.println("main: join");
            t.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println("main end");
    }
}

class CountupThread extends Thread {

    private long counter = 0;
    private volatile boolean shutdownReuqest = false;

    public void shutdownRequest() {
        this.shutdownReuqest = true;
        interrupt();
    }

    public boolean isShutdownRequested() {
        return shutdownReuqest;
    }

    @Override
    public void run() {
        try {
            while (!shutdownReuqest) {
                doWork();
            }
        } catch (InterruptedException e) {

        } finally {
            doShutdown();
        }
    }

    private void doShutdown() {
        System.out.println("doShutdown: count=" + counter);
    }

    private void doWork() throws InterruptedException {
        counter++;
        System.out.println("doWork: count=" + counter);
        Thread.sleep(500);
    }
}