CountDownLatch 和CyclicBarrier的使用

最新推荐文章于 2025-03-02 21:01:41 发布

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最新推荐文章于 2025-03-02 21:01:41 发布

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分类专栏：多线程

本文链接：https://blog.youkuaiyun.com/selfsojourner/article/details/89451852

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本文通过一个具体的Java多线程示例，演示了如何使用CyclicBarrier和CountDownLatch来控制线程间的同步。通过创建一个模拟士兵集结并完成任务的场景，详细解释了这两种同步工具类的用法。

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package ecan.bi.test;

import org.junit.Test;

import java.io.IOException;
import java.util.Random;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.CyclicBarrier;


public class CyclicBarrierTest {
    class SoilderThreadGroup extends ThreadGroup {

        public SoilderThreadGroup() {
            super("soilder");
        }
    }

    class Worker implements Runnable {
        private int index;
        private final CyclicBarrier cyclicBarrier;

        public Worker(int index, CyclicBarrier cyclicBarrier) {
            this.index = index;
            this.cyclicBarrier = cyclicBarrier;
        }

        @Override
        public void run() {
            try {
                System.out.println(Thread.currentThread().getThreadGroup().getName() + index + "报到");
                cyclicBarrier.await();
                doWork();
                System.out.println(Thread.currentThread().getThreadGroup().getName() + index + "执行任务完成");
                cyclicBarrier.await();
            } catch (Exception e) {

            }
        }

        private void doWork() throws InterruptedException {

            Thread.sleep(new Random().nextInt(100) *10 );


        }
    }

    class CallBackWork implements Runnable {
        private boolean flag;
        private final  CountDownLatch countDownLatch;
        public CallBackWork(boolean flag,CountDownLatch countDownLatch) {
            this.flag = flag;
            this.countDownLatch = countDownLatch;
        }

        @Override
        public void run() {
            if (flag) {
                System.out.println("任务全部完成");
                countDownLatch.countDown();
            } else {
                System.out.println("士兵全部集结");
                flag = true;
            }
        }
    }

    @Test
    public void test() throws IOException, InterruptedException {
        CountDownLatch countDownLatch = new CountDownLatch(1);
        CyclicBarrier cyclicBarrier = new CyclicBarrier(10, new Thread(new CallBackWork(false,countDownLatch)));
        SoilderThreadGroup soilderThreadGroup = new SoilderThreadGroup();
        for (int i = 0; i < 10; i++) {
            Thread thread = new Thread(soilderThreadGroup, new Worker(i, cyclicBarrier));
            thread.start();
        }
        countDownLatch.await();
    }
}