10个班级,每个班级20名学生,在指定的时间内查询每个班级学生的集合。
-
- package cn.com.ld.study.thread;
- import java.util.ArrayList;
- import java.util.Collection;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
- import java.util.concurrent.Callable;
- import java.util.concurrent.ExecutionException;
- import java.util.concurrent.ExecutorService;
- import java.util.concurrent.Executors;
- import java.util.concurrent.Future;
- import java.util.concurrent.TimeUnit;
- public class FutureTest {
- //缓存操作数据集
- private static final Map<Integer, List<Student>> sutdenMap = new HashMap<Integer, List<Student>>();
- //初始化操作数据
- static {
- List<Student> stuList = null;
- Student stu;
- for (int i = 0; i < 10; i++) {
- stuList = new ArrayList<Student>();
- for (int j = 0; j < 2; j++) {
- stu = new Student(j, "zld_" + i + "." + j, i);
- stuList.add(stu);
- }
- sutdenMap.put(i, stuList);
- }
- }
- public static class Student {
- private int id;
- private String name;
- private int classID;
- public Student(int id, String name, int classID) {
- this.id = id;
- this.name = name;
- this.classID = classID;
- }
- public String toString() {
- return Student.class.getName() + "(id:" + this.id + ",name:"
- + this.name + ")";
- }
- }
- /**
- * @filename: SearchTask
- * @description: 查询任务
- * @author lida
- * @date 2013-4-1 下午3:02:29
- */
- public static class SearchTask implements Callable<List<Student>> {
- public final int classID;
- public long sleepTime;
- /**
- * <p>Title: </p>
- * <p>Description: </p>
- * @param classID 班级编号
- * @param sleepTime 模拟操作所用的时间数(毫秒)
- */
- SearchTask(int classID, long sleepTime) {
- this.classID = classID;
- this.sleepTime = sleepTime;
- }
- @Override
- public List<Student> call() throws Exception {
- //模拟操作所用的时间数(毫秒)
- Thread.sleep(sleepTime);
- List<Student> stuList = sutdenMap.get(classID);
- return stuList;
- }
- }
- public static void main(String[] args) {
- FutureTest ft = new FutureTest();
- ExecutorService exec = Executors.newCachedThreadPool();
- List<SearchTask> searchTasks = new ArrayList<SearchTask>();
- SearchTask st;
- for (int i = 0; i < 10; i++) {
- st = new SearchTask(i, 2001);//指定2001 毫米为最大执行时间
- searchTasks.add(st);
- }
- try {
- //要求认为在2000毫秒内返回结果,否则取消执行。
- List<Future<List<Student>>> futures = exec.invokeAll(searchTasks,
- 2000, TimeUnit.MILLISECONDS);//invokeAll 第一个参数是任务列表;第二个参数是过期时间;第三个是过期时间单位
- for (Future<List<Student>> future : futures) {
- List<Student> students = future.get();
- for (Student student : students) {
- System.out.println(student.toString());
- }
- }
- exec.shutdown();
- } catch (InterruptedException e) {
- e.printStackTrace();
- Thread.interrupted();
- } catch (ExecutionException e) {
- e.printStackTrace();
- }
- }
- }
- http://zld406504302.iteye.com/blog/1840091
时间: 2024-10-01 05:10:23