秒杀多线程之CyclicBarrier

package com.multithread.cyclicbarrier;

import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import com.multithread.main.ExampleInterface;

public class CyclicBarrierExample extends ExampleInterface {

    @Override
    public void startDemo() {
         System.out.println("开始线程："+Thread.currentThread().getId());
        // TODO Auto-generated method stub
        final CyclicBarrier barrier = new CyclicBarrier(3, new Runnable() {

            /*
             * 运行在最后一个await到达的线程，不是主线程！
             * */
            @Override
            public void run() {
                System.out.println("所有选手ready"+"线程："+Thread.currentThread().getId());
            }
        });
        
        ExecutorService executor = 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();
    }

}

package com.multithread.cyclicbarrier;

import java.util.Random;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;

public class Runner implements Runnable {

     // 一个同步辅助类，它允许一组线程互相等待，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 = barrier;  
        this.name = name;  
    }  
  
    @Override  
    public void run() {  
        try {  
            Thread.sleep(1000 * (new Random()).nextInt(8));  
            System.out.println(name + " 准备好了..."+"线程："+Thread.currentThread().getId());  
            // barrier的await方法，在所有参与者都已经在此 barrier 上调用 await 方法之前，将一直等待。  
            barrier.await();  
        } catch (InterruptedException e) {  
            e.printStackTrace();  
        } catch (BrokenBarrierException e) {  
            e.printStackTrace();  
        }  
        System.out.println(name + " 起跑！"+"线程："+Thread.currentThread().getId());  
    }  
}