如何在Java中的ExecutorService中暂停/恢复所有线程？ [英] How to pause/resume all threads in an ExecutorService in Java?

问题描述

我提交了一堆工作给Java的执行者服务，我不知何故想暂时停止所有这些工作。什么是最好的方法做到这一点？如何恢复？还是我做这个完全错了？我应该按照一些其他模式来实现我想达到的目的（即能否暂停/恢复执行服务）？

I submitted bunch of jobs to an executorservice in Java and I somehow want to temporarily pause all these jobs. What's the best way to do this? How can I resume? Or am I doing this completely wrong? Should I follow some other pattern for what I want to achieve (i.e. ability to pause/resume execution services)?

推荐答案

我自己的问题，我发现了一个 PausableThreadPoolExecutor 在 ThreadPoolExecutor 本身。这是我的版本使用Guava的监视器：

To answer my own question, I found an example of a PausableThreadPoolExecutor in the javadocs of ThreadPoolExecutor itself. Here is my version using Guava's Monitors:

import com.google.common.util.concurrent.Monitor;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadFactory;

public class PausableExecutor extends ScheduledThreadPoolExecutor {

    private boolean isPaused;

    private final Monitor monitor = new Monitor();
    private final Monitor.Guard paused = new Monitor.Guard(monitor) {
        @Override
        public boolean isSatisfied() {
            return isPaused;
        }
    };

    private final Monitor.Guard notPaused = new Monitor.Guard(monitor) {
        @Override
        public boolean isSatisfied() {
            return !isPaused;
        }
    };

    public PausableExecutor(int corePoolSize, ThreadFactory threadFactory) {
        super(corePoolSize, threadFactory);
    }

    protected void beforeExecute(Thread t, Runnable r) {
        super.beforeExecute(t, r);
        monitor.enterWhenUninterruptibly(notPaused);
        try {
            monitor.waitForUninterruptibly(notPaused);
        } finally {
            monitor.leave();
        }
    }

    public void pause() {
        monitor.enterIf(notPaused);
        try {
            isPaused = true;
        } finally {
            monitor.leave();
        }
    }

    public void resume() {
        monitor.enterIf(paused);
        try {
            isPaused = false;
        } finally {
            monitor.leave();
        }
    }
}

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