Spring Boot集成Reactor事件处理框架的简单示例
1. Reactor简介
Reactor 是 Spring 社区发布的基于事件驱动的异步框架,不仅解耦了程序之间的强调用关系,而且有效提升了系统的多线程并发处理能力。
2. Spring Boot集成Reactor的pom.xml
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1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 3 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4 <modelVersion>4.0.0</modelVersion> 5 6 <groupId>org.springframework</groupId> 7 <artifactId>spring-boot-reactor</artifactId> 8 <version>0.1.0</version> 9 10 <parent> 11 <groupId>org.springframework.boot</groupId> 12 <artifactId>spring-boot-starter-parent</artifactId> 13 <version>0.5.0.M2</version> 14 </parent> 15 16 <dependencies> 17 <dependency> 18 <groupId>org.springframework.boot</groupId> 19 <artifactId>spring-boot-starter</artifactId> 20 </dependency> 21 <dependency> 22 <groupId>org.springframework.boot</groupId> 23 <artifactId>spring-boot-starter-web</artifactId> 24 </dependency> 25 <dependency> 26 <groupId>org.projectreactor</groupId> 27 <artifactId>reactor-spring</artifactId> 28 </dependency> 29 <dependency> 30 <groupId>com.fasterxml.jackson.core</groupId> 31 <artifactId>jackson-databind</artifactId> 32 </dependency> 33 <dependency> 34 <groupId>org.springframework</groupId> 35 <artifactId>spring-web</artifactId> 36 </dependency> 37 </dependencies> 38 39 <properties> 40 <start-class>org.springboot.reactor.example.App</start-class> 41 </properties> 42 43 <build> 44 <plugins> 45 <plugin> 46 <artifactId>maven-compiler-plugin</artifactId> 47 </plugin> 48 <plugin> 49 <groupId>org.springframework.boot</groupId> 50 <artifactId>spring-boot-maven-plugin</artifactId> 51 </plugin> 52 </plugins> 53 </build> 54 55 <repositories> 56 <repository> 57 <id>spring-snapshots2</id> 58 <url>http://repo.springsource.org/libs-snapshot</url> 59 <snapshots> 60 <enabled>true</enabled> 61 </snapshots> 62 </repository> 63 <repository> 64 <id>spring-release</id> 65 <url>http://repo.springsource.org/libs-release</url> 66 <snapshots> 67 <enabled>false</enabled> 68 </snapshots> 69 </repository> 70 </repositories> 71 <pluginRepositories> 72 <pluginRepository> 73 <id>spring-snapshots</id> 74 <url>http://repo.springsource.org/libs-snapshot</url> 75 <snapshots> 76 <enabled>true</enabled> 77 </snapshots> 78 </pluginRepository> 79 </pluginRepositories> 80 </project>
3. Spring Boot的主程序
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1 package org.springboot.reactor.example; 2 3 import org.springframework.boot.SpringApplication; 4 import org.springframework.boot.autoconfigure.EnableAutoConfiguration; 5 import org.springframework.context.annotation.ComponentScan; 6 import org.springframework.context.annotation.Configuration; 7 8 @Configuration 9 @EnableAutoConfiguration 10 @ComponentScan 11 public class App{ 12 public static void main( String[] args ) { 13 SpringApplication.run(App.class, args); 14 } 15 }
4. 领域数据User
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1 package org.springboot.reactor.example; 2 3 public class User { 4 5 String firstName; 6 7 String lastName; 8 9 String address; 10 11 String city; 12 13 } 14
5. 实例化Reactor Bean,这里采用内部 Bean 方式实现,其他方式也可以,保证能够供其它类注入即可
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1 package org.springboot.reactor.example; 2 3 import org.springframework.context.annotation.Bean; 4 import org.springframework.context.annotation.Configuration; 5 6 import reactor.core.Environment; 7 import reactor.core.Reactor; 8 import reactor.core.spec.Reactors; 9 10 @Configuration 11 public class Configure { 12 @Bean 13 Environment env() { 14 return new Environment(); 15 } 16 17 @Bean 18 Reactor createReactor(Environment env) { 19 return Reactors.reactor() 20 .env(env) 21 .dispatcher(Environment.THREAD_POOL) 22 .get(); 23 } 24 }
6. Controller层用于通过reactor.notify发送事件
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1 package org.springboot.reactor.example; 2 3 import org.springframework.beans.factory.annotation.Autowired; 4 import org.springframework.web.bind.annotation.RequestMapping; 5 import org.springframework.web.bind.annotation.RestController; 6 7 import reactor.core.Reactor; 8 import reactor.event.Event; 9 10 @RestController 11 @RequestMapping("/api") 12 public class ReactorController { 13 14 @Autowired 15 private Reactor reactor; 16 17 @RequestMapping("/test") 18 public void test() throws InterruptedException{ 19 User user = new User(); 20 user.firstName = "Chetan"; 21 user.lastName = "Birajdar"; 22 user.address = "410 S Hauser"; 23 user.city = "Los Angeles"; 24 reactor.notify("eventHandler", Event.wrap(user)); 25 System.out.println("y0, I sent something for you!!"); 26 } 27 } 28
7. 事件的监听器,以便于接收发送的事件并处理。需要实现 Consumer<Event<T>> 接口,其中 T 是处理程序接收的数据类型,要根据具体业务设置
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1 package org.springboot.reactor.example; 2 3 import org.springframework.stereotype.Service; 4 5 import reactor.event.Event; 6 import reactor.function.Consumer; 7 8 @Service 9 public class AppListener implements Consumer<Event<User>>{ 10 11 public void accept(Event<User> event) { 12 System.out.println("Received user object with " 13 + "first name:" 14 + event.getData().firstName 15 + ", last name:" 16 + event.getData().lastName 17 + ", address:" 18 + event.getData().address 19 + ", city:" 20 + event.getData().city 21 + ""); 22 } 23 } 24
8. ReactorService,实现InitializingBean接口,以便将发送的事件绑定到指定的监听器
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1 package org.springboot.reactor.example; 2 3 import static reactor.event.selector.Selectors.$; 4 5 import org.springframework.beans.factory.InitializingBean; 6 import org.springframework.beans.factory.annotation.Autowired; 7 import org.springframework.stereotype.Service; 8 9 import reactor.core.Reactor; 10 11 @Service 12 public class ReactorService implements InitializingBean{ 13 14 @Autowired 15 private Reactor reactor; 16 17 @Autowired 18 private AppListener appListener; 19 20 @Override 21 public void afterPropertiesSet() throws Exception { 22 reactor.on($("eventHandler"), appListener); 23 } 24 }
9. 当启动应用时,调用/api/test接口,向eventHandler的topic发送User事件,监听器即可接收到相关的事件并处理