semaphore使用场景和方法

有这么一个场景可以使用此类。

比如厕所的坑位，某个厕所有2个坑位，同时最多两人使用。超过两人就需要排队。用完了之后排队的人就可以进入了。代码实现如下

import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.Semaphore;

public class NorTest {
    public static void main(String[] args) throws InterruptedException {
        Semaphore semaphore = new Semaphore(2);
        Bathroom bathroom = new Bathroom(semaphore);
        int j = 6;
        for (int i = 0; i < j; i++) {
            new Thread(bathroom).start();
//            Thread.sleep(1000);
        }
    }
}

@Slf4j
class Bathroom implements Runnable {
    Semaphore semaphore;

    public Bathroom(Semaphore semaphore) {
        this.semaphore = semaphore;
    }

    @Override
    public void run() {
        try {
            String currentThreadName = Thread.currentThread().getName();
            log.info(currentThreadName + "请求坑位中...");
            semaphore.acquire();
            log.info(currentThreadName + "获取到坑位，进入坑位");
            Thread.sleep(1000 * 3);
            log.info(currentThreadName + "坑位使用完毕,释放坑位");
            semaphore.release();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}
//                                17:57:03.509 [Thread-5] INFO com.example.demo.Bathroom - Thread-5请求坑位中...
//                                17:57:03.511 [Thread-5] INFO com.example.demo.Bathroom - Thread-5获取到坑位，进入坑位
//                                17:57:06.515 [Thread-5] INFO com.example.demo.Bathroom - Thread-5坑位使用完毕,释放坑位
//
//                                17:57:03.509 [Thread-4] INFO com.example.demo.Bathroom - Thread-4请求坑位中...
//                                17:57:03.511 [Thread-4] INFO com.example.demo.Bathroom - Thread-4获取到坑位，进入坑位
//                                17:57:06.515 [Thread-4] INFO com.example.demo.Bathroom - Thread-4坑位使用完毕,释放坑位
//
//                                17:57:03.509 [Thread-2] INFO com.example.demo.Bathroom - Thread-2请求坑位中...
//                                17:57:06.515 [Thread-2] INFO com.example.demo.Bathroom - Thread-2获取到坑位，进入坑位
//                                17:57:09.517 [Thread-2] INFO com.example.demo.Bathroom - Thread-2坑位使用完毕,释放坑位
//
//                                17:57:03.509 [Thread-1] INFO com.example.demo.Bathroom - Thread-1请求坑位中...
//                                17:57:06.515 [Thread-1] INFO com.example.demo.Bathroom - Thread-1获取到坑位，进入坑位
//                                17:57:09.517 [Thread-1] INFO com.example.demo.Bathroom - Thread-1坑位使用完毕,释放坑位
//
//                                17:57:03.509 [Thread-3] INFO com.example.demo.Bathroom - Thread-3请求坑位中...
//                                17:57:09.517 [Thread-3] INFO com.example.demo.Bathroom - Thread-3获取到坑位，进入坑位
//                                17:57:12.518 [Thread-3] INFO com.example.demo.Bathroom - Thread-3坑位使用完毕,释放坑位
//
//                                17:57:03.509 [Thread-0] INFO com.example.demo.Bathroom - Thread-0请求坑位中...
//                                17:57:09.517 [Thread-0] INFO com.example.demo.Bathroom - Thread-0获取到坑位，进入坑位
//                                17:57:12.518 [Thread-0] INFO com.example.demo.Bathroom - Thread-0坑位使用完毕,释放坑位