package concurrent;

import java.util.concurrent.*;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @Auther：zhl
 * @Date：2019/7/13
 * @Description： 并发测试，重入锁ReentrantLock解决并发问题
 */
public class ConcurrentSample {
    //并发线程数量
    private static int users = 100;
    //访问次数
    private static int count = 10000;
    //访问总量
    private static int number = 0;
    //private static CyclicBarrier cyclicBarrier = new CyclicBarrier(10000);
    private static ReentrantLock reentrantLock = new ReentrantLock();

    public static void main(String[] args) throws InterruptedException {
        //定义线程池
        ExecutorService executorService = Executors.newCachedThreadPool();
        //并发量
        //Semaphore semaphore = new Semaphore(users);
        CountDownLatch countDownLatch = new CountDownLatch(count);
        for (int i = 0; i < count; i++) {
            executorService.execute(() -> {
                try {
                    //semaphore.acquire();
                    add();
                    countDownLatch.countDown();
                    //semaphore.release();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });
        }
        countDownLatch.await();
        executorService.shutdown();
        System.out.println("计数器：" + number);
    }

    public static void add() {
        //加锁
        reentrantLock.lock();
        number++;
        //解锁
        reentrantLock.unlock();
    }
}

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