SpringCloud（第 047 篇）注解式Async配置异步任务

摘要：耗时毫秒耗时毫秒耗时毫秒添加异步任务控制器测试异步任务控制器。

-

1、有时候我们在处理一些任务的时候，需要开启线程去异步去处理，原有逻辑继续往下执行；
2、当遇到这种场景的时候，线程是可以将我们完成，然后在SpringCloud中也有这样的注解来支撑异步任务处理；

    4.0.0

    springms-async
    1.0-SNAPSHOT
    jar
    
    
        com.springms.cloud
        springms-spring-cloud
        1.0-SNAPSHOT
    
    
    
        
        
            org.springframework.boot
            spring-boot-starter-web
        
    

server:
  port: 8345
spring:
  application:
    name: springms-async  #全部小写

package com.springms.cloud.task;

import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.AsyncResult;
import org.springframework.stereotype.Component;

import java.text.SimpleDateFormat;
import java.util.Random;
import java.util.concurrent.Future;

/**
 * Async实现异步调用。
 *
 * @author hmilyylimh
 *
 * @version 0.0.1
 *
 * @date 2017/10/19
 *
 */
@Component
public class AsyncTasks {

    public static Random random = new Random();

    @Async
    public Future doTaskOne() throws Exception {
        System.out.println("Async, taskOne, Start...");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        System.out.println("Async, taskOne, End, 耗时: " + (end - start) + "毫秒");
        return new AsyncResult<>("AsyncTaskOne Finished");
    }

    @Async
    public Future doTaskTwo() throws Exception {
        System.out.println("Async, taskTwo, Start");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(10000));
        long end = System.currentTimeMillis();
        System.out.println("Async, taskTwo, End, 耗时: " + (end - start) + "毫秒");
        return new AsyncResult<>("AsyncTaskTwo Finished");
    }

    @Async
    public Future doTaskThree() throws Exception {
        System.out.println("Async, taskThree, Start");
        long start = System.currentTimeMillis();
        Thread.sleep(random.nextInt(5000));
        long end = System.currentTimeMillis();
        System.out.println("Async, taskThree, End, 耗时: " + (end - start) + "毫秒");
        return new AsyncResult<>("AsyncTaskThree Finished");
    }
}

package com.springms.cloud.controller;

import com.springms.cloud.task.AsyncTasks;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.concurrent.Future;

/**
 * 测试异步任务Web控制器。
 *
 * @author hmilyylimh
 *
 * @version 0.0.1
 *
 * @date 2017/10/19
 *
 */
@RestController
public class AsyncTaskController {

    @Autowired
    AsyncTasks asyncTasks;

    /**
     * 测试异步任务。
     *
     * @return
     * @throws Exception
     */
    @GetMapping("/task")
    public String task() throws Exception {
        long start = System.currentTimeMillis();

        Future task1 = asyncTasks.doTaskOne();
        Future task2 = asyncTasks.doTaskTwo();
        Future task3 = asyncTasks.doTaskThree();

        while(true) {
            if(task1.isDone() && task2.isDone() && task3.isDone()) {
                // 三个任务都调用完成，退出循环等待
                break;
            }
            Thread.sleep(1000);
        }

        long end = System.currentTimeMillis();

        String result = "任务全部完成，总耗时：" + (end - start) + "毫秒";
        return result;
    }
}

package com.springms.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableAsync;

/**
 * 注解式Async配置异步任务；
 *
 * @author hmilyylimh
 *
 * @version 0.0.1
 *
 * @date 2017/10/19
 *
 */
@SpringBootApplication
@EnableAsync
public class MsAsyncApplication {

    public static void main(String[] args) {
        SpringApplication.run(MsAsyncApplication.class, args);
        System.out.println("【【【【【【 Async异步任务微服务 】】】】】】已启动.");
    }
}

/****************************************************************************************
 一、简单用户链接Mysql数据库微服务（Async实现异步调用）：

 1、添加注解 EnableAsync、Async 以及任务类上注解 Component ；
 2、启动 springms-async 模块服务，启动1个端口；
 3、然后在浏览器输入地址 http://localhost:8345/task 然后等待大约10多秒后，成功打印所有信息，一切正常；

 总结：说明 Async 异步任务配置生效了；
 ****************************************************************************************/

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