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SpringCloud(第 047 篇)注解式Async配置异步任务
一、大致介绍
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;
二、实现步骤
2.1 添加 maven 引用包
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
2.2 添加应用配置文件(springms-async\src\main\resources\application.yml)
server:
port: 8345
spring:
application:
name: springms-async #全部小写
2.3 添加异步任务类(springms-async\src\main\java\com\springms\cloud\task\AsyncTasks.java)
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");
}
}
2.4 添加异步任务Web控制器(springms-async\src\main\java\com\springms\cloud\controller\AsyncTaskController.java)
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;
}
}
2.5 添加微服务启动类(springms-schedule\src\main\java\com\springms\cloud\MsScheduleApplication.java)
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.");
}
}
三、测试
/****************************************************************************************
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;
****************************************************************************************/
四、下载地址
https://gitee.com/ylimhhmily/SpringCloudTutorial.git
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