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Dubbo分组聚合

news 来源：原创 2024/4/30 13:24:52

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>