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基于dubbo分组group的一些总结

开发者 https://www.devze.com 2023-03-22 10:40 出处:网络 作者: 普通网友
目录服务分组分组聚合总结服务分组 1.当一个接口有多种实现时,可用使用group分组。
目录
  • 服务分组
  • 分组聚合
  • 总结

服务分组

1.当一个接口有多种实现时,可用使用group分组。

实现代码如下:

package com.xxx.service;

public interface MyDubb开发者_Go培训oGroupService {

	public String print();
	
}


package com.xxx.service.impl;

import com.xxx.service.MyDubboGroupService;

public class FeebackService implements MyDubboGroupService {

	@Override
	public String print() {
		// TODO Auto-generated method stub
		return "feedback";
	}

}


package com.xxx.service.impl;

import com.xxx.service.MyDubboGroupService;

public class cmsService implements MyDubboGroupService {

	@Override
	public String print() {
		// TODO Auto-generated method stub
		return "cms";
	}

}

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"
	xshttp://www.devze.comi: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="feebackService" class="com.xxx.service.impl.FeebackService" />
	<bean id="cmsService" class="com.xxx.service.impl.CmsService" />
	
	<!-- 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">

 <!-- 指定服务名字 -->
 <dubbo:application name="dubboGroup" />

 <!-- 声明服务注册中心 -->
 <dubbo:registry protocol="zookeeper" address="127.0.0.1:2181" />

 <!-- 暴露你的服务地址 -->
 <dubbo:service interface="com.xxx.service.MyDubboGroupService" group="feedback" />
 <dubbo:service interface="com.xxx.service.MyDubboGroupService" group="cms"编程客栈 />

</beans>

调用端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="dubboGroup" />
 
 <!-- 声明服务注册中心 -->
 <dubbo:registry protocol="zookeeper" address="127.0.0.1编程:2181" />

 <!-- 暴露你的服务地址 -->
 <dubbo:reference id="feebackService" interface="com.xxx.service.MyDubboGroupService" group="feedback" />
 <dubbo:reference id="cmsService" interface="com.xxx.service.MyDubboGroupService" group="cms" />
 <!-- 任意组 -->
 <dubbo:reference id="autoService" interface="com.xxx.service.MyDubboGroupService" group="*" />
 
</beans>

调用代码如下:

package com.xxx.application;

import Java.io.IOException;

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

import com.xxx.service.MyDubboGroupService;

public class DubboApplication {
 
 public static void main(String[] args) throws IOException {
  ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
  // 访问feedback接口
  MyDubboGroupService feebackService = (MyDubboGroupService) ctx.getBean("feebackService");
  System.out.println(feebackService.print());
  // 访问member接口
  MyDubboGroupService cmsService = (MyDubboGroupService) ctx.getBean("cmsService");
  System.out.println(cmsService.pri编程nt());
  // 访问随机接口
  MyDubboGroupService autoService = (MyDubboGroupService) ctx.getBean("autoService");
  System.out.println(autoService.print());
 }
 
}

2.上面调用端dubbo.xml 配置出现的任意组:(2.2.0以上版本支持,总是只调一个可用组的实现)

<dubbo:reference id="autoService" interface="com.xxx.service.MyDubboGroupService" group="*" />

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。(从2.1.0版本开始支持)

基于dubbo分组group的一些总结

配置如:(搜索所有分组)

<dubandroidbo:reference interface="com.xxx.MenuService" group="*" merger="true" />

或:(合并指定分组)

<dubbo:reference interface="com.xxx.MenuService" group="aaa,bbb" merger="true" />

或:(指定方法合并结果,其他未指定的方法,将只调用一个Group)

<dubbo:reference interface="com.xxx.MenuService" group="*">
    <dubbo:method name="getMenuItems" merger="true"/>
</dubbo:reference>

或:(某个方法不合并结果,其他都合并结果)

<dubbo:reference interface="com.xxx.MenuService" group="*" merger="true">
    <dubbo:method name="getMenuItems" merger="false"/>
</dubbo:reference>

或:(指定合并策略,缺省根据返回值类型自动匹配,如果同一类型有两个合并器时,需指定合并器的名称)

<dubbo:reference interface="com.xxx.MenuService" group="*">
    <dubbo:method name="getMenuItems" merger="mymerge"/>
</dubbo:reference>

或:(指定合并方法,将调用返回结果的指定方法进行合并,合并方法的参数类型必须是返回结果类型本身)

<dubbo:reference interface="com.xxx.MenuService" group="*">
    <dubbo:method name="getMenuItems" merger=".addAll"/>
</dubbo:reference>

总结

以上为个人经验,希望能给大家一个参考,也希望大家多多支持我们。

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