线程池使用之ScheduledExecutorService

场景：启动一个线程，周期性的执行某一任务（状态检查）

1、定义状态检查类

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class StatusCheck
{
    private ScheduledExecutorService threadPool;
    
    //周期执行某一任务，线程池中开一个线程足矣s
    private int threadNum = 1;
    
    //第一次执行任务的延迟时间
    private long initDelay = 0;
    
    //执行周期
    private long period = 5;
    
    public void start()
    {
        //新建一个线程池
        threadPool = Executors.newScheduledThreadPool(threadNum);
        threadPool.scheduleAtFixedRate(new StatusCheckTask(), initDelay, period, TimeUnit.SECONDS);
    }
    
    //关闭线程池
    public void stop()
    {
        if (null != threadPool)
        {
            threadPool.shutdown();
            threadPool = null;
        }
        
    }
}

class StatusCheckTask implements Runnable
{
    
    @Override
    public void run()
    {
        //用”打印当前线程的名称“来模拟状态检查任务
        Thread thread = Thread.currentThread();
        
        System.out.println(thread.getName());
    }
    
}

2、测试类

public class ScheduledExecutorServiceTest
{
    
    public static void main(String[] args)
    {
        StatusCheck checker = new StatusCheck();
        checker.start();
        checker.stop();
    }
    
}