Dubbo Stub 操作实例

Stub 存根，可以在dubbo 提供者端实现，也可在调用消费方实现； 如果消费方实现存根，则服务方 存根 将不起作用。

提供者实现：

接口：  IStubTestService    对应的stub实现：   IStubTestServiceStub

服务类：  StubTestServiceImpl

package com.jgq.dubbo_Service.service;public interface IStubTestService {public String sayHello(String name) ;}

package com.jgq.dubbo_Service.service;public class IStubTestServiceStub implements IStubTestService {private final IStubTestService _ics;public IStubTestServiceStub(IStubTestService ics){this._ics = ics;}public String sayHello(String name) {try{return this._ics.sayHello(name);}catch(Exception e){return "提供方容错数据!";}}}

package com.jgq.dubbo_Service.service.impl;import com.jgq.dubbo_Service.service.IStubTestService;public class StubTestServiceImpl implements IStubTestService {public String sayHello(String name) {    int i = (int)(Math.random()*1000);    if(i<600)    {int ia = Integer.parseInt("ss");  //stub 测试        }return "提供方服务数据  调用: " + name + String.valueOf(i);}}

服务配置：   applicationProvider.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://code.alibabatech.com/schema/dubbo          http://code.alibabatech.com/schema/dubbo/dubbo.xsd          ">        <!-- Application name -->      <dubbo:application name="hello-world-app"  logger="log4j"/>        <!-- registry address, used for service to register itself -->      <dubbo:registry address="zookeeper://127.0.0.1:2181" />        <!-- Default Protocol -->        <!-- expose this service through dubbo protocol, through port 20880 -->    <dubbo:protocol name="dubbo"    port="20881" accesslog="true"/> 

    <!-- Service interface   Concurrent Control 提供本地服务  -->      <!-- Stub Runing Client Service 客户端回调服务 -->    <span style="color:#ff0000;"><dubbo:service interface="com.jgq.dubbo_Service.service.IStubTestService"  ref="stubService" executes="10"  stub="com.jgq.dubbo_Service.service.IStubT</span>estServiceStub" />  

    <!-- designate implementation -->      <bean id="stubService" class="com.jgq.dubbo_Service.service.impl.StubTestServiceImpl" />  </beans>    

场景类：

package com.main;import org.springframework.context.support.ClassPathXmlApplicationContext;public class DubboProviderMain {          public static void main(String[] args) throws Exception {          System.out.println("Main Starting...");                ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(                  new String[]{"applicationProvider.xml"});          context.start();          System.out.println("Press any key to exit.");          System.in.read();      }}

消费者实现：  

package com.jgq.service.impl;import com.jgq.dubbo_Service.service.IStubTestService;public class StubTestServiceProxy implements IStubTestService {private final IStubTestService _ics;public StubTestServiceProxy(IStubTestService ics){this._ics = ics;}public String sayHello(String name) {try{return this._ics.sayHello(name);}catch(Exception e){return "本地Stub 存根数据： " + name;}}}

<?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://code.alibabatech.com/schema/dubbo          http://code.alibabatech.com/schema/dubbo/dubbo.xsd          ">        <!-- consumer application name -->      <dubbo:application name="consumer-of-helloworld-app" logger="log4j"/>        <!-- registry address, used for consumer to discover services -->      <dubbo:registry address="zookeeper://127.0.0.1:2181" />      <dubbo:consumer timeout="5000"/>          <!-- which service to consume? -->  <span style="color:#ff0000;">    <dubbo:reference id="stubService" interface="com.jgq.dubbo_Service.service.IStubTestService"  stub="com.jgq.service.impl.StubTestServiceProxy"/>  </span><!-- 本地 bean -->    <bean id ="demoCallback" class = "com.jgq.service.impl.NotifyImpl" /></beans> 

消费服务：  

stubService  如果服务异常，则自动返回stub 存根内容。