线程问题--（Semaphore线程安全）

package com.mmall.concurrency.example.atomic;


import com.mmall.concurrency.annoations.ThreadSafe;
import lombok.extern.slf4j.Slf4j;


import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicLong;


@Slf4j
@ThreadSafe
public class AtomicExample2 {


    // 请求总数
    public static int clientTotal = 5000;


    // 同时并发执行的线程数
    public static int threadTotal = 200;


    public static AtomicLong count = new AtomicLong(0);


    public static void main(String[] args) throws Exception {
        ExecutorService executorService = Executors.newCachedThreadPool();
        final Semaphore semaphore = new Semaphore(threadTotal);
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
        for (int i = 0; i < clientTotal ; i++) {
            executorService.execute(() -> {
                try {
                    semaphore.acquire();
                    add();
                    semaphore.release();
                } catch (Exception e) {
                }
                countDownLatch.countDown();
            });
        }
        countDownLatch.await();
        executorService.shutdown();
    }


    private static void add() {
        count.incrementAndGet();
        // count.getAndIncrement();
    }
}