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
<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);
}
}