【并发编程】- CyclicBarrier 屏障损坏性

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CyclicBarrier下 使用方法isBroken()检查屏障损坏性

实现类代码如下：

public class CyclicBarrierBrokenService {
    private CyclicBarrier cyclicBarrier;

    public CyclicBarrierBrokenService(CyclicBarrier cyclicBarrier){
        super();
        this.cyclicBarrier=cyclicBarrier;
    }

    private void startRun(int count){
        try {
        System.out.println(Thread.currentThread().getName()+" 到了 在等待其他人都到了开始起跑");
        if(Thread.currentThread().getName().equals("Thread-2")){
                System.out.println("Thread-2 进来了");
                Thread.sleep(5000);
                Integer.parseInt("A");
        }
        cyclicBarrier.await();
        System.out.println(" 都到了，开始跑！");
        System.out.println(Thread.currentThread().getName()+" 到达终点，并结束第 "+count+"赛段");
        } catch (InterruptedException e) {
            System.out.println("进入了InterruptionedException e"+cyclicBarrier.isBroken());
            e.printStackTrace();
        } catch (BrokenBarrierException e) {
            System.out.println("进入了BrokenBarrierException e"+cyclicBarrier.isBroken());
            e.printStackTrace();
        }
    }

    public void call(){
        for (int i = 0; i < 1; i++) {
            startRun(i+1);
        }
    }
}

线程执行代码如下：

public class BrokenThread implements Runnable{

    private CyclicBarrierBrokenService cyclicBarrierBrokenService;

    public BrokenThread(CyclicBarrierBrokenService cyclicBarrierBrokenService){
        super();
        this.cyclicBarrierBrokenService=cyclicBarrierBrokenService;
    }


    @Override
    public void run() {
        cyclicBarrierBrokenService.call();
    }
}

运行类代码如下：

public class CyclicBarrierBrokenRun {
    public static void main(String[] args) {
        int parties = 4;
        CyclicBarrier cyclicBarrier = new CyclicBarrier(parties, new Runnable() {
            @Override
            public void run() {
                System.out.println(" 都到了！");
            }
        });

        CyclicBarrierBrokenService cyclicBarrierBrokenService = new CyclicBarrierBrokenService(cyclicBarrier);
        BrokenThread[] brokenThreads = new BrokenThread[4];
        for (int i = 0; i <brokenThreads.length ; i++) {
            brokenThreads[i] = new BrokenThread(cyclicBarrierBrokenService);
            new Thread(brokenThreads[i]).start();
        }
    }
}

运行结果如下：

Thread-1 到了 在等待其他人都到了开始起跑
Thread-0 到了 在等待其他人都到了开始起跑
Thread-3 到了 在等待其他人都到了开始起跑
Thread-2 到了 在等待其他人都到了开始起跑
Thread-2 进来了
Exception in thread "Thread-2" java.lang.NumberFormatException: For input string: "A"
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
	at java.lang.Integer.parseInt(Integer.java:580)
	at java.lang.Integer.parseInt(Integer.java:615)
	at com.ozx.concurrentprogram.cyclicBarrier.service.CyclicBarrierBrokenService.startRun(CyclicBarrierBrokenService.java:25)
	at com.ozx.concurrentprogram.cyclicBarrier.service.CyclicBarrierBrokenService.call(CyclicBarrierBrokenService.java:41)
	at com.ozx.concurrentprogram.cyclicBarrier.entity.BrokenThread.run(BrokenThread.java:22)
	at java.lang.Thread.run(Thread.java:748)

从运行结果来看，有一个线程出现异常报错，则其他线程继续等待，并不影响程序运行的主流程。可以使用方法isBroken()来查询此屏障是否处于损坏状态。