CyclicBarrier的应用场景

public class CyclicBarrierTest { public static void main(String[] args) throws IOException, InterruptedException { //如果将参数改为4&＃xff0c;但是下面只加入了3个选手&＃xff0c;这永远等待下去 //Waits until all parties have invoked await on this barrier. CyclicBarrier barrier &＃61; new CyclicBarrier(3); ExecutorService executor &＃61; Executors.newFixedThreadPool(3); executor.submit(new Thread(new Runner(barrier, "1号选手"))); executor.submit(new Thread(new Runner(barrier, "2号选手"))); executor.submit(new Thread(new Runner(barrier, "3号选手"))); executor.shutdown(); }
} class Runner implements Runnable { // 一个同步辅助类&＃xff0c;它允许一组线程互相等待&＃xff0c;直到到达某个公共屏障点 (common barrier point) private CyclicBarrier barrier; private String name; public Runner(CyclicBarrier barrier, String name) { super(); this.barrier &＃61; barrier; this.name &＃61; name; } &＃64;Override public void run() { try { Thread.sleep(1000 * (new Random()).nextInt(8)); System.out.println(name &＃43; " 准备好了..."); // barrier的await方法&＃xff0c;在所有参与者都已经在此 barrier 上调用 await 方法之前&＃xff0c;将一直等待。
barrier.await(); } catch (InterruptedException e) { e.printStackTrace(); } catch (BrokenBarrierException e) { e.printStackTrace(); } System.out.println(name &＃43; " 起跑&＃xff01;"); }
}