Dubbo专栏:SpringBoot整合Dubbo服务降级与豪猪断路器一

vlambda
2020-12-02

Dubbo专栏:SpringBoot整合Dubbo服务降级与豪猪断路器一

SpringBoot整合Dubbo与豪猪断路器，必须了解什么是服务降级？

当服务器压力剧增的情况下，根据实际业务情况及流量，对一些服务和页面有策略的不处理或换种简单的方式处理，从而释放服务器资源以保证核心交易正常运作或高效运作。

工程目录

创建maven的坐标

<?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"> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.4.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <modelVersion>4.0.0</modelVersion>
 <artifactId>springboot-dubbo-service-provider</artifactId>
 <packaging>jar</packaging>
 <name>boot-user-service-provider</name> <description>Demo project for Spring Boot</description>


 <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>com.example</groupId> <artifactId>iterface-common</artifactId> <version>1.0-SNAPSHOT</version> </dependency> <dependency> <groupId>com.alibaba.boot</groupId> <artifactId>dubbo-spring-boot-starter</artifactId> <version>0.2.0</version> </dependency>
 <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency>

 <dependency> <groupId>org.springframework.cloud</groupId> <artifactId> spring-cloud-starter-netflix-hystrix </artifactId> </dependency> </dependencies>
 <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>

 <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Finchley.SR1</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement>
</project>

添加配置文件

application.yml

#dubbo.application.name=user-service-provider
#dubbo.registry.address=127.0.0.1:2181
#dubbo.registry.protocol=zookeeper
#
#dubbo.protocol.name=dubbo
##dubbo.protocol.port=20881
#
#dubbo.monitor.protocol=registry
##dubbo.scan.base-packages=com.atguigu.gmall

dubbo.properties

dubbo.protocol.port=20882

provider.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
      http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd
      http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
   <!-- 1、指定当前服务/应用的名字（同样的服务名字相同，不要和别的服务同名） -->
   <dubbo:application name="springboot-dubbo-service-provider"></dubbo:application>
   
   <!-- 2、指定注册中心的位置 -->
   <!-- <dubbo:registry address="zookeeper://127.0.0.1:2181"></dubbo:registry> -->
   <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181"></dubbo:registry>
   
   <!-- 3、指定通信规则（通信协议？通信端口） -->
   <dubbo:protocol name="dubbo" port="20882"></dubbo:protocol>
   
   <!-- 4、暴露服务   ref：指向服务的真正的实现对象 -->
   <dubbo:service interface="com.dubbo.common.service.UserService"
      ref="userServiceImpl01" timeout="1000" version="1.0.0">
      <dubbo:method name="getUserAddressList" timeout="1000"></dubbo:method>
   </dubbo:service>
   
   <!--统一设置服务提供方的规则  -->
   <dubbo:provider timeout="1000"></dubbo:provider>
   
   
   <!-- 服务的实现 -->
   <bean id="userServiceImpl01" class="com.yang.dubbo.service.impl.UserServiceImpl"></bean>
   
   
   <!-- 连接监控中心 -->
   <dubbo:monitor protocol="registry"></dubbo:monitor>
   
</beans>

创建配置类

package com.yang.dubbo.config;
import java.util.ArrayList;
import java.util.List;
import com.dubbo.common.service.UserService;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.alibaba.dubbo.config.ApplicationConfig;
import com.alibaba.dubbo.config.MethodConfig;
import com.alibaba.dubbo.config.MonitorConfig;
import com.alibaba.dubbo.config.ProtocolConfig;
import com.alibaba.dubbo.config.ProviderConfig;
import com.alibaba.dubbo.config.RegistryConfig;
import com.alibaba.dubbo.config.ServiceConfig;
@Configuration
public class MyDubboConfig {
   
   @Bean
   public ApplicationConfig applicationConfig() {
      ApplicationConfig applicationConfig = new ApplicationConfig();
      applicationConfig.setName("springboot-dubbo-service-provider");
      return applicationConfig;
   }
   
   //<dubbo:registry protocol="zookeeper" address="127.0.0.1:2181"></dubbo:registry>
   @Bean
   public RegistryConfig registryConfig() {
      RegistryConfig registryConfig = new RegistryConfig();
      registryConfig.setProtocol("zookeeper");
      registryConfig.setAddress("127.0.0.1:2181");
      return registryConfig;
   }
   
   //<dubbo:protocol name="dubbo" port="20882"></dubbo:protocol>
   @Bean
   public ProtocolConfig protocolConfig() {
      ProtocolConfig protocolConfig = new ProtocolConfig();
      protocolConfig.setName("dubbo");
      protocolConfig.setPort(20882);
      return protocolConfig;
   }
   
   /**
    *<dubbo:service interface="com.atguigu.gmall.service.UserService" 
      ref="userServiceImpl01" timeout="1000" version="1.0.0">
      <dubbo:method name="getUserAddressList" timeout="1000"></dubbo:method>
   </dubbo:service>
    */
   @Bean
   public ServiceConfig<UserService> userServiceConfig(UserService userService){
      ServiceConfig<UserService> serviceConfig = new ServiceConfig<>();
      serviceConfig.setInterface(UserService.class);
      serviceConfig.setRef(userService);
      serviceConfig.setVersion("1.0.0");
      
      //配置每一个method的信息
      MethodConfig methodConfig = new MethodConfig();
      methodConfig.setName("getUserAddressList");
      methodConfig.setTimeout(1000);
      
      //将method的设置关联到service配置中
      List<MethodConfig> methods = new ArrayList<>();
      methods.add(methodConfig);
      serviceConfig.setMethods(methods);
      
      //ProviderConfig
      //MonitorConfig
      
      return serviceConfig;
   }

}

service层

package com.yang.dubbo.service.impl;
import java.util.Arrays;
import java.util.List;
import com.dubbo.common.bean.UserAddress;
import com.dubbo.common.service.UserService;
import org.springframework.stereotype.Component;
import com.alibaba.dubbo.config.annotation.Reference;
import com.alibaba.dubbo.config.annotation.Service;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
@Service//暴露服务 
@Component
public class UserServiceImpl implements UserService {

   @HystrixCommand
   @Override
   public List<UserAddress> getUserAddressList(String userId) {
      // TODO Auto-generated method stub
      System.out.println("UserServiceImpl..3.....");
      UserAddress address1 = new UserAddress(1, "北京市昌平区宏福科技园综合楼3层", "1", "李老师", "010-56253825", "Y");
      UserAddress address2 = new UserAddress(2, "深圳市宝安区西部硅谷大厦B座3层（深圳分校）", "1", "王老师", "010-56253825", "N");
//    try {
//       Thread.sleep(2000);
//    } catch (InterruptedException e) {
//       e.printStackTrace();
//    }
      if(Math.random()>0.5) {
         throw new RuntimeException();
      }
      return Arrays.asList(address1,address2);
   }

}

启动类

package com.yang.dubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import com.alibaba.dubbo.config.spring.context.annotation.EnableDubbo;
/**
 * 1、导入依赖；
 *        1）、导入dubbo-starter
 *        2）、导入dubbo的其他依赖
 * @author lfy
 *
 * SpringBoot与dubbo整合的三种方式：
 * 1）、导入dubbo-starter，在application.properties配置属性，使用@Service【暴露服务】使用@Reference【引用服务】
 * 2）、保留dubbo xml配置文件;
 *        导入dubbo-starter，使用@ImportResource导入dubbo的配置文件即可
 * 3）、使用注解API的方式：
 *        将每一个组件手动创建到容器中,让dubbo来扫描其他的组件
 */
//@EnableDubbo //开启基于注解的dubbo功能
//@ImportResource(locations="classpath:provider.xml")
@EnableDubbo(scanBasePackages="com.yang.dubbo")
@EnableHystrix //开启服务容错
@SpringBootApplication
public class BootUserServiceProviderApplication {

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