技術標籤：多執行緒與高併發

                                             執行緒池之定時任務執行緒池ScheduledPool

package src.main.java.com.qqjx.thread;

/*
 * @Auther  wangpeng
 * @Date 2021/2/6
 */

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


public class T10_ScheduledPool {
    public static void main(String[] args) {

        ScheduledExecutorService service = Executors.newScheduledThreadPool(4);
        service.scheduleAtFixedRate(()->{
            try {
                TimeUnit.MILLISECONDS.sleep(new Random
 
().nextInt(1000));
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName());
        }, 0, 500, TimeUnit.MILLISECONDS);

    }
}

原始碼呼叫棧
Executors.newScheduledThreadPool(4); 原始碼
    public static ScheduledExecutorService newScheduledThreadPool
 
(int corePoolSize) {
        return new ScheduledThreadPoolExecutor(corePoolSize);
    }
new ScheduledThreadPoolExecutor(corePoolSize);原始碼
	public ScheduledThreadPoolExecutor(int corePoolSize) {
        super(corePoolSize, Integer.MAX_VALUE, 0, NANOSECONDS,
              new DelayedWorkQueue());
    }
super(corePoolSize, Integer.MAX_VALUE, 0, NANOSECONDS, new DelayedWorkQueue()); 原始碼
	public ThreadPoolExecutor(int corePoolSize,
                              int maximumPoolSize,
                              long keepAliveTime,
                              TimeUnit unit,
                              BlockingQueue<Runnable> workQueue) {
        this(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue,
             Executors.defaultThreadFactory(), defaultHandler);
    }

pool-1-thread-1
pool-1-thread-1
pool-1-thread-2
pool-1-thread-1
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3
pool-1-thread-3