Future接口例子程序

最新推荐文章于 2026-01-01 15:39:09 发布

最新推荐文章于 2026-01-01 15:39:09 发布 · 94 阅读

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本文介绍了一个使用Java实现的预调度任务示例。该示例通过创建一个可执行的服务（ExecutorService），并提交一个实现了Callable接口的任务（TaskPreScheduler）。文章展示了如何设置任务超时，并在任务完成后进行相应的处理。

package preschedule;


import java.util.concurrent.*;


public class TaskTest {


	public static void addToPreScheduleTaskQueue(ExecutorService exec) {


		TaskPreScheduler mapTaskPreScheduler =  new TaskPreScheduler();
		Future<Boolean> future = exec.submit(mapTaskPreScheduler);
		Boolean taskResult = null;


		try {
			taskResult = future.get(100, TimeUnit.MICROSECONDS);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ExecutionException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (TimeoutException e) {
			// TODO Auto-generated catch block
			future.cancel(true); //
			System.out.println(" preSchedule:  interrupted! Over Time Limit! ");
		} finally {
			exec.shutdownNow();
		}


		// 这里判断是否预调度成功，并作相应处理
		if (taskResult == true) // 未超时,TP成功完成
		{
			System.out.println(Thread.currentThread().getName() + " preSchedule Succeeded! ");
		} else
			System.out.println(" preSchedule Failed! ");
	}
 
	
	public static void main(String argv[]) throws Exception {
		ExecutorService exec = Executors.newCachedThreadPool();
		addToPreScheduleTaskQueue(exec);
	}
}


class TaskPreScheduler implements Callable<Boolean> {


	public TaskPreScheduler()
	{
//	   System.out.println(Thread.currentThread().getName()   + " TaskPreScheduler created! ");	
	}
	
	@Override
	public Boolean call() throws Exception {
		// TODO Auto-generated method stub
		System.out.println( Thread.currentThread().getName() +" preschedule called!");
		return true;
	}
}