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✨ spring-boot-demo-async 完成

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Yangkai.Shen 5 years ago
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      spring-boot-demo-async/README.md
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# spring-boot-demo-async

> 此 demo 主要演示了 Spring Boot 如何使用原生提供的异步任务支持，实现异步执行任务。

## pom.xml

```xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<artifactId>spring-boot-demo-async</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>jar</packaging>

<name>spring-boot-demo-async</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>com.xkcoding</groupId>
<artifactId>spring-boot-demo</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
</dependencies>

<build>
<finalName>spring-boot-demo-async</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>
```

## application.yml

```yaml
spring:
task:
execution:
pool:
# 最大线程数
max-size: 16
# 核心线程数
core-size: 16
# 存活时间
keep-alive: 10s
# 队列大小
queue-capacity: 100
# 是否允许核心线程超时
allow-core-thread-timeout: true
# 线程名称前缀
thread-name-prefix: async-task-
```

## SpringBootDemoAsyncApplication.java

```java
/**
* <p>
* 启动器
* </p>
*
* @package: com.xkcoding.async
* @description: 启动器
* @author: yangkai.shen
* @date: Created in 2018-12-29 10:28
* @copyright: Copyright (c) 2018
* @version: V1.0
* @modified: yangkai.shen
*/
@EnableAsync
@SpringBootApplication
public class SpringBootDemoAsyncApplication {

public static void main(String[] args) {
SpringApplication.run(SpringBootDemoAsyncApplication.class, args);
}

}
```

## TaskFactory.java

```java
/**
* <p>
* 任务工厂
* </p>
*
* @package: com.xkcoding.async.task
* @description: 任务工厂
* @author: yangkai.shen
* @date: Created in 2018-12-29 10:37
* @copyright: Copyright (c) 2018
* @version: V1.0
* @modified: yangkai.shen
*/
@Component
@Slf4j
public class TaskFactory {

/**
* 模拟5秒的异步任务
*/
@Async
public Future<Boolean> asyncTask1() throws InterruptedException {
doTask("asyncTask1", 5);
return new AsyncResult<>(Boolean.TRUE);
}

/**
* 模拟2秒的异步任务
*/
@Async
public Future<Boolean> asyncTask2() throws InterruptedException {
doTask("asyncTask2", 2);
return new AsyncResult<>(Boolean.TRUE);
}

/**
* 模拟3秒的异步任务
*/
@Async
public Future<Boolean> asyncTask3() throws InterruptedException {
doTask("asyncTask3", 3);
return new AsyncResult<>(Boolean.TRUE);
}

/**
* 模拟5秒的同步任务
*/
public void task1() throws InterruptedException {
doTask("task1", 5);
}

/**
* 模拟2秒的同步任务
*/
public void task2() throws InterruptedException {
doTask("task2", 2);
}

/**
* 模拟3秒的同步任务
*/
public void task3() throws InterruptedException {
doTask("task3", 3);
}

private void doTask(String taskName, Integer time) throws InterruptedException {
log.info("{}开始执行，当前线程名称【{}】", taskName, Thread.currentThread().getName());
TimeUnit.SECONDS.sleep(time);
log.info("{}执行成功，当前线程名称【{}】", taskName, Thread.currentThread().getName());
}
}
```

## TaskFactoryTest.java

```java
/**
* <p>
* 测试任务
* </p>
*
* @package: com.xkcoding.async.task
* @description: 测试任务
* @author: yangkai.shen
* @date: Created in 2018-12-29 10:49
* @copyright: Copyright (c) 2018
* @version: V1.0
* @modified: yangkai.shen
*/
@Slf4j
public class TaskFactoryTest extends SpringBootDemoAsyncApplicationTests {
@Autowired
private TaskFactory task;

/**
* 测试异步任务
*/
@Test
public void asyncTaskTest() throws InterruptedException, ExecutionException {
long start = System.currentTimeMillis();
Future<Boolean> asyncTask1 = task.asyncTask1();
Future<Boolean> asyncTask2 = task.asyncTask2();
Future<Boolean> asyncTask3 = task.asyncTask3();

// 调用 get() 阻塞主线程
asyncTask1.get();
asyncTask2.get();
asyncTask3.get();
long end = System.currentTimeMillis();

log.info("异步任务全部执行结束，总耗时：{} 毫秒", (end - start));
}

/**
* 测试同步任务
*/
@Test
public void taskTest() throws InterruptedException {
long start = System.currentTimeMillis();
task.task1();
task.task2();
task.task3();
long end = System.currentTimeMillis();

log.info("同步任务全部执行结束，总耗时：{} 毫秒", (end - start));
}
}
```

## 运行结果

### 异步任务

```bash
2018-12-29 10:57:28.511 INFO 3134 --- [ async-task-3] com.xkcoding.async.task.TaskFactory : asyncTask3开始执行，当前线程名称【async-task-3】
2018-12-29 10:57:28.511 INFO 3134 --- [ async-task-1] com.xkcoding.async.task.TaskFactory : asyncTask1开始执行，当前线程名称【async-task-1】
2018-12-29 10:57:28.511 INFO 3134 --- [ async-task-2] com.xkcoding.async.task.TaskFactory : asyncTask2开始执行，当前线程名称【async-task-2】
2018-12-29 10:57:30.514 INFO 3134 --- [ async-task-2] com.xkcoding.async.task.TaskFactory : asyncTask2执行成功，当前线程名称【async-task-2】
2018-12-29 10:57:31.516 INFO 3134 --- [ async-task-3] com.xkcoding.async.task.TaskFactory : asyncTask3执行成功，当前线程名称【async-task-3】
2018-12-29 10:57:33.517 INFO 3134 --- [ async-task-1] com.xkcoding.async.task.TaskFactory : asyncTask1执行成功，当前线程名称【async-task-1】
2018-12-29 10:57:33.517 INFO 3134 --- [ main] com.xkcoding.async.task.TaskFactoryTest : 异步任务全部执行结束，总耗时：5015 毫秒
```

### 同步任务

```bash
2018-12-29 10:55:49.830 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task1开始执行，当前线程名称【main】
2018-12-29 10:55:54.834 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task1执行成功，当前线程名称【main】
2018-12-29 10:55:54.835 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task2开始执行，当前线程名称【main】
2018-12-29 10:55:56.839 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task2执行成功，当前线程名称【main】
2018-12-29 10:55:56.839 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task3开始执行，当前线程名称【main】
2018-12-29 10:55:59.843 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task3执行成功，当前线程名称【main】
2018-12-29 10:55:59.843 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactoryTest : 同步任务全部执行结束，总耗时：10023 毫秒
```

## 参考

- Spring Boot 异步任务线程池的配置 参考官方文档：https://docs.spring.io/spring-boot/docs/2.1.0.RELEASE/reference/htmlsingle/#boot-features-task-execution-scheduling

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