线程池使用及CountDownLatch类使用

最新推荐文章于 2024-08-23 22:23:04 发布

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#线程池 #CountDownLatch

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public class Main {

    private static final int COUNT = 100;
    private static int poolSize = -1;
    private static ExecutorService mExecutorService;
    private static CountDownLatch mLatch;
    private static Runnable mRunable = new Runnable() {

        @Override
        public void run() {
            //每执行一次子线程，计数器减1
            mLatch.countDown();
            int currentCount = (int) mLatch.getCount();
            if (currentCount <=5 ) {
               System.out.println("currentCount = " + currentCount);
            }
        }
    };


    /**
     * @param args主函数入口
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("Test Thread MainThread Start...");
        //1.创建线程池
        initialize();
        //2.设置同步计数器
        mLatch = new CountDownLatch(COUNT);
        for (int i = 0; i < COUNT; i++) {
            //3.执行子线程
            mExecutorService.execute(mRunable);
        }
        try {
            //4.只要计数器大于零就阻塞主线程，直到子线程全部执行完毕
            mLatch.await();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

<span style="white-space:pre">	</span>//5.关闭线程池
        mExecutorService.shutdownNow();
    }

    //初始化线程池
    private static void initialize() {
        if (poolSize == -1) {
            //从配置文件中获取线程池的大小，及同时执行子线程的线程数
            poolSize = Config.getPoolSize();
        }
        //通过类ExecutorService创建线程池
        mExecutorService = Executors.newFixedThreadPool(poolSize);
    }

}