dubbox在企业中的应用

作者: goodchax | 来源:发表于2017-08-30 17:23 被阅读115次

    我们摒弃其它教程粗陋的思路,当你看到这篇文章之时,代表已经做出选择;这里只是做细微讲解,demo请到
    dubbo github:https://github.com/alibaba/dubbo
    dubbox github:https://github.com/dangdangdotcom/dubbox
    下载详细代码,查看事例

    大纲

    • 官方文档
    • 项目结构
    • 环境配置
      • 提供者
      • 消费者
    • dubbo协议
      • 默认Hessian序列化
      • kyro序列化

    一、官方文档

    dubbo:http://dubbo.io/


    二、项目结构

    项目结构图
    • ems-***-api:包含model数据对象、service层接口
    • ems-***-provider:是对service接口的实现和dao层
    • ems--rest:restful协议实现层,引用了ems--api
    为什么会是这样的结构?

    项目中项目让其它消费端使用该接口,但是不想让对方了解业务的具体实现;当项目发布部署后,我们只需要把ems-***-api给消费端使用,dubbo即可调用远程实现层;

    项目架构说明:dubbo进入到我的项目


    二、环境配置

    提供者

    ems-cic-provider的pom.xml中加和ems-cic-api的包


    提供者结构
    • src/main/java:java代码
    • src/main/assembly:
      assembly.xml打包配置文件
      conf包含数据库连接、dubbo、redis等相关参数(properties)文件
    • src/main/resources
      META-INF/spring/dubbo-provider.xml:dubbo配置文件
    //dubbo-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:jee="http://www.springframework.org/schema/jee"
        xmlns:tx="http://www.springframework.org/schema/tx" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
        xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd
        http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">
        
        <context:property-placeholder location="classpath:conf/*.properties"/>
        <import resource="spring-config-db.xml"/>
    <!--应用相关,name:应用名称、owner:所有者、organization:组织-->
        <dubbo:application name="ems-cic" owner="cic" organization="ems" />
    <!--协议相关,name:协议名称、serialization:序列化方式、host:提供者所在服务器ip、port:提供者端口号-->
        <dubbo:protocol name="dubbo" serialization="kryo" host="${dubbo.protocol.host}" port="${dubbo.protocol.port}" />
    <!--对协议进行设置,delay:延时、timeout:接口调用过期时间、retries:重度次数-->
        <dubbo:provider protocol="dubbo" delay="-1" timeout="20000" retries="0"  />
    <!--注册地址,一般情况下使用zookeeper,如:zookeeper://127.0.0.1:2181-->
        <dubbo:registry address="${dubbo.registry.address}" />
    <!--接口暴露,interface:ems-***-api中所定义的java interface、ref:spring扫描的service实现别名、protocol:指定以什么协议暴露接口、validation:true表示验证接口参数-->
        <dubbo:service interface="net.slans.ems.cic.service.SignService" ref="signService" protocol="dubbo" validation="true" />
        <dubbo:service interface="net.slans.ems.cic.service.DepartmentService" ref="departmentService" protocol="dubbo" validation="true" />
        <dubbo:service interface="net.slans.ems.cic.service.UserService" ref="userService" protocol="dubbo" validation="true" />
        <dubbo:service interface="net.slans.ems.cic.service.RoleService" ref="roleService" protocol="dubbo" validation="true" />
        <dubbo:service interface="net.slans.ems.cic.manager.OmpCodeManager" ref="ompCodeManager" protocol="dubbo" validation="true" />
        <dubbo:service interface="net.slans.ems.cic.manager.OmpTokenManager" ref="ompTokenManager" protocol="dubbo" validation="true" /> 
        <dubbo:service interface="net.slans.ems.cic.manager.OmpRegCodeManager" ref="ompRegCodeManager" protocol="dubbo" validation="true" /> 
    
    </beans>
    
    //dubbo.properties
    dubbo.application.name=ems-uic-provider
    dubbo.protocol.host=127.0.0.1
    dubbo.protocol.port=20810
    dubbo.protocol.timeout=2000000
    dubbo.registry.address=zookeeper://127.0.0.1:2181
    dubbo.log4j.file=logs/dubbo.log
    dubbo.log4j.level=WARN
    

    这个地方我需要唠叨一下,

    • dubbo.provider timeout:当提供者没有在指定时间内返回数据就会报错,当数据源查询数据比较慢就会出现此类问题
    • dubbo.provider retries:当因指定时间内未返回数据,是否重复调用此接口,当插入数据时,重复执行会造成数据重复
    • dubbo.protocol host:在这里指定内部ip在内网才可以使用,最开始我们没有指定此项,跨服务器消费者启动会出现接口无法访问

    此处无法列举出所有问题,有其它问题可以评论

    消费者
    <?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:jee="http://www.springframework.org/schema/jee"
        xmlns:tx="http://www.springframework.org/schema/tx" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
        xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd
        http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">
        
        <context:property-placeholder location="classpath:conf/*.properties"/>
        <import resource="spring-config.xml"/>
        
        <dubbo:application name="ems-omp-rest" owner="uic" organization="ems" />
    
        <dubbo:registry address="zookeeper://127.0.0.1:2181" />
    <!--注意:消费者和提供者需要使用共同的序列化方法-->
        <dubbo:protocol name="dubbo" serialization="kryo" />
        
        <!-- 访问的接口 -->
        <dubbo:reference id="snsCodeManager" interface="net.slans.ems.uic.manager.SnsCodeManager" protocol="dubbo" validation="true" />
        <dubbo:reference id="snsTokenManager" interface="net.slans.ems.uic.manager.SnsTokenManager" protocol="dubbo" validation="true" /> 
        <dubbo:reference id="ompCodeManager" interface="net.slans.ems.cic.manager.OmpCodeManager" protocol="dubbo" validation="true" />
        <dubbo:reference id="ompTokenManager" interface="net.slans.ems.cic.manager.OmpTokenManager" protocol="dubbo" validation="true" />
        <dubbo:reference id="ompRegCodeManager" interface="net.slans.ems.cic.manager.OmpRegCodeManager" protocol="dubbo" validation="true" /> 
        <dubbo:reference id="verifyManager" interface="net.slans.ems.uic.manager.VerifyManager" protocol="dubbo" validation="true" /> 
        <dubbo:reference id="signService" interface="net.slans.ems.cic.service.SignService" protocol="dubbo" validation="true" />
        <dubbo:reference id="departmentService" interface="net.slans.ems.cic.service.DepartmentService" protocol="dubbo" validation="true" />
        <dubbo:reference id="userService" interface="net.slans.ems.cic.service.UserService" protocol="dubbo" validation="true" />
        <dubbo:reference id="roleService" interface="net.slans.ems.cic.service.RoleService" protocol="dubbo" validation="true" />
        <dubbo:reference id="slansService" interface="net.slans.ems.uic.service.SlansService" protocol="dubbo" validation="true" /> 
        
    </beans>
    

    三、dubbo协议

    • 默认Hessian序列化
    //默认是Hessian不指定即可
    <dubbo:protocol name="dubbo" host="${dubbo.protocol.host}" port="${dubbo.protocol.port}" />
    
    • kyro序列化
    //serialization="kryo"
    <dubbo:protocol name="dubbo" serialization="kryo" host="${dubbo.protocol.host}" port="${dubbo.protocol.port}" />
    

    接下来,会涉及到dubbox restful、mycat、jstorm、redis、mongodb、react+redux


    很高兴认识你,我们都一样,有过迷茫却从未放弃;害怕孤独可从不寂寞。

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