SpringBoot异步调用(Async Call)

异步调用在开发中经常使用,本文通过一个简单的例子快速了解异步调用在SpringBoot中是如何使用的。

编码实现

Create Project

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<?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>

<groupId>com.wuwenze</groupId>
<artifactId>springboot-async-examples</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>springboot-async-examples</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</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-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

TaskExecutor Bean

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package com.wuwenze.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.task.AsyncTaskExecutor;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

/**
* @author wwz
* @version 1 (2018/6/21)
* @since Java7
*/
@Configuration
public class AsyncTaskConfig {

@Bean
public AsyncTaskExecutor taskExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setThreadNamePrefix("Async-Executor-Example");
executor.setMaxPoolSize(10);
executor.setCorePoolSize(3);
// 使用预定义的异常处理类
executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
//...
return executor;
}
}

AsyncTask Examples

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package com.wuwenze.task;

import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.AsyncResult;
import org.springframework.stereotype.Component;

import java.util.concurrent.Future;

/**
* @author wwz
* @version 1 (2018/6/21)
* @since Java7
*/
@Slf4j
@Component
public class AsyncTaskDemo {

@Async
public void test1() {
log.debug("com.wuwenze.task.AsyncTaskDemo#test1(): 常规异步调用,不含参数和返回值");
}

@Async
public void test2(String name) {
log.debug("com.wuwenze.task.AsyncTaskDemo#test2(): 常规异步调用,可接收参数:name = {}", name);
}

@Async
public Future<String> test3(String name) {
log.debug("com.wuwenze.task.AsyncTaskDemo#test3(): 可接收参数以及返回值:name = {}", name);

return new AsyncResult<>(String.format("hello, %s", name));
}
}

单元测试

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package com.wuwenze.task;

import com.wuwenze.SpringbootAsyncExamplesApplication;
import lombok.extern.log4j.Log4j2;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.annotation.Resource;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

/**
* @author wwz
* @version 1 (2018/6/21)
* @since Java7
*/
@Slf4j
@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringbootAsyncExamplesApplication.class)
public class AsyncTaskDemoTest {

@Resource
AsyncTaskDemo asyncTaskDemo;

@Test
public void testAsyncMethods() throws ExecutionException, InterruptedException {
asyncTaskDemo.test1();
asyncTaskDemo.test2("china");

Future<String> future = asyncTaskDemo.test3("wuwenze");
log.debug("test3() 接收返回值:future: {}", future.get());
}
}

最终结果打印

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2018-06-21 22:16:32.324 DEBUG 5388 --- [ecutor-Example1] com.wuwenze.task.AsyncTaskDemo           : com.wuwenze.task.AsyncTaskDemo#test1(): 常规异步调用,不含参数和返回值
2018-06-21 22:16:32.324 DEBUG 5388 --- [ecutor-Example2] com.wuwenze.task.AsyncTaskDemo : com.wuwenze.task.AsyncTaskDemo#test2(): 常规异步调用,可接收参数:name = china
2018-06-21 22:16:32.324 DEBUG 5388 --- [ecutor-Example3] com.wuwenze.task.AsyncTaskDemo : com.wuwenze.task.AsyncTaskDemo#test3(): 可接收参数以及返回值:name = wuwenze
2018-06-21 22:16:32.325 DEBUG 5388 --- [ main] com.wuwenze.task.AsyncTaskDemoTest : test3() 接收返回值:future: hello, wuwenze

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