Dubbo分组聚合

按组合并返回结果，比如菜单服务，接口一样，但有多种实现，用group区分，现在消费方需要从每种group中调用一次返回结果，合并结果返回，这样就可以实现聚合菜单项。

实现代码如下：

服务器端实现。

package com.yncp.dubbo.service;

import java.util.List;
import java.util.Map;

public interface IDubboMergeService {

/**
* 测试分组聚合
* @return
*/
public String[] groupArray();

/**
* 测试分组聚合
* @return
*/
public List<String> groupList();

/**
* 测试分组聚合
* @return
*/
public Map<String,Object> groupMap();
}

package com.yncp.dubbo.service.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.yncp.dubbo.service.IDubboMergeService;

public class DubboMergeService1Impl implements IDubboMergeService {

public List<String> groupList() {
ArrayList<String> arrayList = new ArrayList<String>();
arrayList.add("张三");
arrayList.add("李四");
return arrayList;
}

public Map<String, Object> groupMap() {
Map<String,Object> map=new HashMap<String, Object>();
map.put("user1", "张三");
map.put("user2", "李四");
return map;
}

@Override
public String[] groupArray() {
return new String[]{"A","B","C","D"};
}

}

package com.yncp.dubbo.service.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.yncp.dubbo.service.IDubboMergeService;

public class DubboMergeService2Impl implements IDubboMergeService {

public String[] groupArray() {
return new String[]{"A","B","C","D","E","F"};
}

public List<String> groupList() {
ArrayList<String> arrayList = new ArrayList<String>();
arrayList.add("王五");
arrayList.add("鲁智深");
return arrayList;
}

public Map<String, Object> groupMap() {
Map<String,Object> map=new HashMap<String, Object>();
map.put("user3", "王五");
map.put("user4", "鲁智深");
return map;
}

}

applicationContext.xml 配置：

<?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"> 
<!-- 配置Bean -->
<bean id="mergeService1" class="com.yncp.dubbo.service.impl.DubboMergeService1Impl"/>
<bean id="mergeService2" class="com.yncp.dubbo.service.impl.DubboMergeService2Impl"/>
<!-- 引入配置文件 -->
<import resource="classpath:dubbo.xml"/>
</beans>

dubbo.xml配置：

<?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"> 
<!-- 指定web服务名字 -->
<dubbo:application name="DubboMerge"/>
<!-- 声明服务注册中心 -->
<dubbo:registry  protocol="zookeeper" address="127.0.0.1:2181"/>
<!-- 指定传输层通信协议 -->
<dubbo:protocol name="dubbo" port="20880"/>
<dubbo:protocol name="rmi" port="1099"/>

<!-- 暴露你的服务地址 -->
<dubbo:service
ref="mergeService1"
interface="com.yncp.dubbo.service.IDubboMergeService"
protocol="dubbo,rmi"
group="new"
/>
<dubbo:service
ref="mergeService2"
interface="com.yncp.dubbo.service.IDubboMergeService"
protocol="dubbo,rmi"
group="old"
/>
</beans>

客户端实现：

package com.yncp.dubbo.service;
import java.util.List;
import java.util.Map;

public interface IDubboMergeService {

/**
* 测试分组聚合
* @return
*/
public String[] groupArray();

/**
* 测试分组聚合
* @return
*/
public List<String> groupList();

/**
* 测试分组聚合
* @return
*/
public Map<String,Object> groupMap();
}

package com.yncp.dubbo.service;
import java.io.IOException;
import java.util.Map;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class DubboStart {
public static void main(String[] args) throws IOException {
ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");
//分组聚合
IDubboMergeService mergeService=(IDubboMergeService) ctx.getBean("mergeService");
for (String string : mergeService.groupArray()) {
System.out.println(string);
}
for (String string : mergeService.groupList()) {
System.out.println(string);
}
for (Map.Entry<String, Object> entry : mergeService.groupMap().entrySet()) {
String key = entry.getKey();
Object value=entry.getValue();
System.out.println(key+" "+value);
}

}
}

dubbo.xml配置：

<?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"> 
<!-- 指定web服务名字 -->
<dubbo:application name="DubboMerge"/>
<!-- 声明服务注册中心 -->
<dubbo:registry protocol="zookeeper" address="127.0.0.1:2181"/>

<!-- 指定传输层通信协议 -->
<dubbo:protocol name="dubbo" port="20881"/>
<dubbo:protocol name="rmi" port="1010"/>

<!-- 暴露你的服务地址 -->
<dubbo:reference
id="mergeService"
interface="com.yncp.dubbo.service.IDubboMergeService"
protocol="dubbo" group="*">
<dubbo:method name="groupArray" merger="true"/>
<dubbo:method name="groupList" merger="true"/>
<dubbo:method name="groupMap" merger="true"/>
</dubbo:reference>
</beans>