限制java中线程的执行时间示例

Question

我想用java模拟一个调度程序。我定义了三个线程。现在我想执行线程 1 占用 10% 的时间，线程 2 占用 30% 的时间，线程 3 占用剩余 60% 的时间。

所有三个线程都是持续的监视任务，永远不会结束。

即，如果我执行程序 100 分钟，则线程 1 执行 10 分钟，线程 2 执行 30 分钟，线程 2 执行 30 分钟。线程 3 持续 60 分钟。

而且每当线程被转移时（即另一个线程进入运行状态），我应该打印“线程x执行Y秒”

任何人都可以提供一些关于在java中实现上述模拟的指示吗？

Answer 1

这个链接应该很有趣。

import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class MainThread
{
        public static void main(String[] args)
        {
                int corePoolSize = 2;
                ScheduledThreadPoolExecutor stpe = new ScheduledThreadPoolExecutor(corePoolSize);

                /*
                 * This will execute the WorkerThread immediately
                 */
                stpe.execute(new WorkerThread("WorkerThread-Running-Immediately"));

                /*
                 * This will execute the WorkerThread only once after 10 Seconds
                 */
                stpe.schedule(new WorkerThread("WorkerThread-Scheduled-After-10-seconds"), 10, TimeUnit.SECONDS);

                /*
                 * This will execute the WorkerThread continuously for every 5 seconds with an initial delay of 10
                 * seconds for the first WorkerThread to start execution cycle. In this case, whether the first
                 * WorkerThread is completed or not, the second WorkerThread will start exactly after 5 seconds hence
                 * called schedule at fixed rate. This continues till 'n' threads are executed.
                 */
                stpe.scheduleAtFixedRate(new WorkerThread("WorkerThread-Running-At-Fixed-Rate"), 10, 5, TimeUnit.SECONDS);

                /*
                 * This will execute the WorkerThread continuously with an initial delay of 10 seconds for the first
                 * WorkerThread to start execution cycle. Once the first thread execution completes then a delay of 5
                 * Seconds is introduced so that the next WorkerThread execution cycle starts. This continues till
                 * 'n' thread are executed. This is called schedule each thread with a fixed delay.
                 */
                stpe.scheduleWithFixedDelay(new WorkerThread("WorkerThread-Running-With-Fixed-Delay"), 10, 5, TimeUnit.SECONDS);
        }
}

还有一个工作线程：

public class WorkerThread implements Runnable
{
        private String  threadName      = null;

        public WorkerThread(String threadName)
        {
                this.threadName = threadName;
        }

        public void run()
        {
                System.out.println(this.threadName + " started...");
                try
                {
                        Thread.sleep(5000);
                }
                catch (InterruptedException e)
                {
                        e.printStackTrace();
                }
                System.out.println(this.threadName + " ended...");
        }
}