济南网站设计制作公司,wordpress 324,做资讯网站怎么挣钱,专业的购物网站建设前几天在公司的项目上有个同事使用了多线程统计数据#xff0c;当时出现了一个用户一直使用服务器首次登录信息作为查询信息。找了半天才发现#xff0c;线程池资源同步了。后面手动将数据set进去的。 等待线程全部执行完毕#xff0c;这里使用的是减法计数器#xff0c;也…前几天在公司的项目上有个同事使用了多线程统计数据当时出现了一个用户一直使用服务器首次登录信息作为查询信息。找了半天才发现线程池资源同步了。后面手动将数据set进去的。 等待线程全部执行完毕这里使用的是减法计数器也可而已用加法计数器CyclicBarrier package com.quxiao.controller;import java.util.*;
import java.util.concurrent.*;
import java.util.stream.Collectors;/*** program: package1* author: quxiao* create: 2023-09-27 15:22**/
public class t3 {static final ExecutorService service Executors.newFixedThreadPool(10);public static void main(String[] args) throws ExecutionException, InterruptedException {CountDownLatch countDownLatch new CountDownLatch(4);FutureTask task1 new FutureTask(new t(2, countDownLatch));FutureTask task2 new FutureTask(new t(3, countDownLatch));FutureTask task3 new FutureTask(new t(4, countDownLatch));FutureTask task4 new FutureTask(new t(5, countDownLatch));service.execute(task1);service.execute(task2);service.execute(task3);service.execute(task4);countDownLatch.await();System.out.println(task1.get());System.out.println(task2.get());System.out.println(task3.get());System.out.println(task4.get());
// service.shutdown();}static class t implements CallableListInteger {ListInteger list Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);int sum 0;CountDownLatch countDownLatch;public t(int sum, CountDownLatch countDownLatch) {this.sum sum;this.countDownLatch countDownLatch;}Overridepublic ListInteger call() throws Exception {TimeUnit.SECONDS.sleep(1L);ListInteger returnList list.stream().filter(x - x sum).collect(Collectors.toList());countDownLatch.countDown();return returnList;}}
}限流操作限制人数访问超过预定值就等待 package com.quxiao.controller;import java.util.*;
import java.util.concurrent.*;
import java.util.stream.Collectors;/*** program: package1* author: quxiao* create: 2023-09-27 15:22**/
public class t3 {static final ExecutorService service Executors.newFixedThreadPool(10);public static void main(String[] args) throws ExecutionException, InterruptedException {Semaphore semaphore new Semaphore(3);for (int i 0; i 9; i) {final int t i;new Thread(() - {try {semaphore.acquire();TimeUnit.SECONDS.sleep(5L);System.out.println(Thread.currentThread().getName() 进来了);System.out.println(Thread.currentThread().getName() 出去了);System.out.println();} catch (InterruptedException e) {throw new RuntimeException(e);} finally {semaphore.release();}}, i).start();}}
}
