CyclicBarrier

最新推荐文章于 2022-03-11 16:16:37 发布

原创最新推荐文章于 2022-03-11 16:16:37 发布 · 333 阅读

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本文介绍了一种Java并发编程中常用的同步工具CyclicBarrier的使用案例，通过模拟多个跑步运动员准备并同时出发的场景，展示了如何利用CyclicBarrier来控制多线程的同步执行。

应用场景：每个线程代表一个跑步运动员，当运动员都准备好了之后，才一起出发，只要有一个人没准备好，大家都等待。

public class UseCyclicBarrier {

	static class Runner implements Runnable {  
	    private CyclicBarrier barrier;  
	    private String name;  
	    
	    public Runner(CyclicBarrier barrier, String name) {  
	        this.barrier = barrier;  
	        this.name = name;  
	    }  
	    @Override  
	    public void run() {  
	        try {  
	            Thread.sleep(1000 * (new Random()).nextInt(5));  
	            System.out.println(name + ": prepare ok");
	            barrier.await();
				System.out.println(name + ": go go go!!!");
			} catch (InterruptedException e) {
	            e.printStackTrace();  
	        } catch (BrokenBarrierException e) {  
	            e.printStackTrace();  
	        }
	    }  
	} 
	
    public static void main(String[] args) throws IOException, InterruptedException, BrokenBarrierException {
        CyclicBarrier barrier = new CyclicBarrier(3);  // barrier.await()三次 才能执行await后面的代码
        ExecutorService executor = Executors.newFixedThreadPool(3);  
        
        executor.submit(new Thread(new Runner(barrier, "zhangsan")));  
        executor.submit(new Thread(new Runner(barrier, "lisi")));  
        executor.submit(new Thread(new Runner(barrier, "wangwu")));

        executor.shutdown();  
    }  
  
}