摘要：耗時毫秒耗時毫秒耗時毫秒添加異步任務控制器測試異步任務控制器。

-

1、有時候我們在處理一些任務的時候，需要開啟線程去異步去處理，原有邏輯繼續往下執行；
2、當遇到這種場景的時候，線程是可以將我們完成，然后在SpringCloud中也有這樣的注解來支撐異步任務處理；

    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  #全部小寫

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實現異步調用。
 *
 * @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, 耗時: " + (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, 耗時: " + (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, 耗時: " + (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;

/**
 * 測試異步任務Web控制器。
 *
 * @author hmilyylimh
 *
 * @version 0.0.1
 *
 * @date 2017/10/19
 *
 */
@RestController
public class AsyncTaskController {

    @Autowired
    AsyncTasks asyncTasks;

    /**
     * 測試異步任務。
     *
     * @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()) {
                // 三個任務都調用完成，退出循環等待
                break;
            }
            Thread.sleep(1000);
        }

        long end = System.currentTimeMillis();

        String result = "任務全部完成，總耗時：" + (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配置異步任務；
 *
 * @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異步任務微服務 】】】】】】已啟動.");
    }
}

/****************************************************************************************
 一、簡單用戶鏈接Mysql數據庫微服務（Async實現異步調用）：

 1、添加注解 EnableAsync、Async 以及任務類上注解 Component ；
 2、啟動 springms-async 模塊服務，啟動1個端口；
 3、然后在瀏覽器輸入地址 http://localhost:8345/task 然后等待大約10多秒后，成功打印所有信息，一切正常；

 總結：說明 Async 異步任務配置生效了；
 ****************************************************************************************/

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