Spring Boot 中的异步调用

49.Spring-Boot-Async/pom.xml

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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>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.1.0.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>com.example</groupId>
+    <artifactId>demo</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>demo</name>
+    <description>Demo project for Spring Boot</description>
+
+    <properties>
+        <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-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>

49.Spring-Boot-Async/src/main/java/com/example/demo/DemoApplication.java

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+package com.example.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.scheduling.annotation.EnableAsync;
+
+@SpringBootApplication
+@EnableAsync
+public class DemoApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(DemoApplication.class, args);
+    }
+}

49.Spring-Boot-Async/src/main/java/com/example/demo/config/AsyncPoolConfig.java

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+package com.example.demo.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
+
+import java.util.concurrent.ThreadPoolExecutor;
+
+/**
+ * @author MrBird
+ */
+@Configuration
+public class AsyncPoolConfig {
+
+    @Bean
+    public ThreadPoolTaskExecutor asyncThreadPoolTaskExecutor(){
+        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
+        executor.setCorePoolSize(20);
+        executor.setMaxPoolSize(200);
+        executor.setQueueCapacity(25);
+        executor.setKeepAliveSeconds(200);
+        executor.setThreadNamePrefix("asyncThread");
+        executor.setWaitForTasksToCompleteOnShutdown(true);
+        executor.setAwaitTerminationSeconds(60);
+
+        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
+
+        executor.initialize();
+        return executor;
+    }
+}

49.Spring-Boot-Async/src/main/java/com/example/demo/controller/TestController.java

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+package com.example.demo.controller;
+
+import com.example.demo.service.TestService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+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;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * @author MrBird
+ */
+@RestController
+public class TestController {
+
+    private Logger logger = LoggerFactory.getLogger(this.getClass());
+
+    @Autowired
+    private TestService testService;
+
+    @GetMapping("async")
+    public String testAsync() throws Exception {
+        long start = System.currentTimeMillis();
+        logger.info("异步方法开始");
+
+        Future<String> stringFuture = testService.asyncMethod();
+        String result = stringFuture.get(60, TimeUnit.SECONDS);
+        logger.info("异步方法返回值：{}", result);
+
+        logger.info("异步方法结束");
+
+        long end = System.currentTimeMillis();
+        logger.info("总耗时：{} ms", end - start);
+        return stringFuture.get();
+    }
+
+    @GetMapping("sync")
+    public void testSync() {
+        long start = System.currentTimeMillis();
+        logger.info("同步方法开始");
+
+        testService.syncMethod();
+
+        logger.info("同步方法结束");
+        long end = System.currentTimeMillis();
+        logger.info("总耗时：{} ms", end - start);
+    }
+
+}

49.Spring-Boot-Async/src/main/java/com/example/demo/service/TestService.java

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+package com.example.demo.service;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.scheduling.annotation.AsyncResult;
+import org.springframework.stereotype.Service;
+
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * @author MrBird
+ */
+@Service
+public class TestService {
+
+    private Logger logger = LoggerFactory.getLogger(this.getClass());
+
+    @Async("asyncThreadPoolTaskExecutor")
+    // @Async
+    public Future<String> asyncMethod() {
+        sleep();
+        logger.info("异步方法内部线程名称：{}", Thread.currentThread().getName());
+        return new AsyncResult<>("hello async");
+    }
+
+    public void syncMethod() {
+        sleep();
+    }
+
+    private void sleep() {
+        try {
+            TimeUnit.SECONDS.sleep(2);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+}

49.Spring-Boot-Async/src/main/resources/application.properties

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+

49.Spring-Boot-Async/src/test/java/com/example/demo/DemoApplicationTests.java

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+package com.example.demo;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class DemoApplicationTests {
+
+    @Test
+    public void contextLoads() {
+    }
+
+}