本文共 2424 字,大约阅读时间需要 8 分钟。
package com.myd.cn.ThreadLocal; import java.util.ArrayList; import java.util.List; import java.util.Random; import java.util.concurrent.Callable; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.Future; public class ThreadPoolCallableTest { public static void testGetTicketsInfo() throws Exception{ //根据CPU核数来创建线程数量,CPU密集型是N+1,I/O密集型是2N+1 ExecutorService executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors()); //获取10家酒店的可预订房间 int taskNum = 10; //主线程启动时间 long mainStartTime = System.currentTimeMillis(); //使用Future来获取覆写Callable的call方法的任务返回结果 List> futureList = new ArrayList<>(); //1.提交Callable任务到线程池,执行该任务并返回结果 for (int i = 0; i < taskNum; i++) { //使用重写Callable call方法来向线程池提交任务,并指定call方法返回值类型为String Callable callable = () ->{ //每个Callable任务提交的开始时间 long start = System.currentTimeMillis(); //随机指定睡眠时间来模拟从酒店获取可订房间数量的等待时间 long sleep = new Random().nextInt(5000); return "Hotel-corps-result "+sleep; }; //使用submit提交任务,从submit获取返回值,返回值类型为call方法的返回值了类型String Future future = executorService.submit(callable); //将每个线程执行任务的Future,用于后续解析个线程结果 futureList.add(future); } //3.根据各任务执行后的返回的Future来解析返回结果 for (Future future : futureList) { String availableRoomsOfPerHotel = future.get(); System.out.println("执行获取的每个酒店的可用房任务后,返回每个酒店可用房间结果: "+availableRoomsOfPerHotel+" 间数"); } System.out.println(Thread.currentThread().getName()+" cost "+ (System.currentTimeMillis()-mainStartTime)); } public static void main(String[] args) throws Exception { testGetTicketsInfo(); } }
转载地址:http://vhjzb.baihongyu.com/