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| Introduction |
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| 3 源码构建 |
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| 4 框架设计 |
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| 5 扩展点加载 |
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| <li class="chapter " data-level="1.7" data-path="SPI参考手册/introduction.html"> |
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| 6 SPI参考手册 |
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| <li class="chapter " data-level="1.7.1" data-path="SPI参考手册/协议扩展.html"> |
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| 6.1 协议扩展 |
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| 6.2 调用拦截扩展 |
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| </a> |
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| 6.3 引用监听扩展 |
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| 6.4 暴露监听扩展 |
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| </a> |
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| 6.5 集群扩展 |
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| </a> |
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| 6.6 路由扩展 |
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| </a> |
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| <a href="SPI参考手册/负载均衡扩展.html"> |
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| 6.7 负载均衡扩展 |
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| </a> |
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| <a href="SPI参考手册/合并结果扩展.html"> |
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| 6.8 合并结果扩展 |
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| </a> |
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| <li class="chapter " data-level="1.7.9" data-path="SPI参考手册/注册中心扩展.html"> |
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| <a href="SPI参考手册/注册中心扩展.html"> |
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| 6.9 注册中心扩展 |
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| </a> |
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| <li class="chapter " data-level="1.7.10" data-path="SPI参考手册/监控中心扩展.html"> |
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| <a href="SPI参考手册/监控中心扩展.html"> |
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| 6.10 监控中心扩展 |
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| </a> |
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| <li class="chapter " data-level="1.7.11" data-path="SPI参考手册/扩展点加载扩展.html"> |
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| <a href="SPI参考手册/扩展点加载扩展.html"> |
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| 6.11 扩展点加载扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.12" data-path="SPI参考手册/动态代理扩展.html"> |
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| <a href="SPI参考手册/动态代理扩展.html"> |
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| 6.12 动态代理扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.13" data-path="SPI参考手册/编译器扩展.html"> |
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| <a href="SPI参考手册/编译器扩展.html"> |
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| 6.13 编译器扩展 |
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| </a> |
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| <li class="chapter " data-level="1.7.14" data-path="SPI参考手册/消息派发扩展.html"> |
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| <a href="SPI参考手册/消息派发扩展.html"> |
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| 6.14 消息派发扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.15" data-path="SPI参考手册/线程池扩展.html"> |
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| <a href="SPI参考手册/线程池扩展.html"> |
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| 6.15 线程池扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.16" data-path="SPI参考手册/序列化扩展.html"> |
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| <a href="SPI参考手册/序列化扩展.html"> |
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| 6.16 序列化扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.17" data-path="SPI参考手册/网络传输扩展.html"> |
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| <a href="SPI参考手册/网络传输扩展.html"> |
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| 6.17 网络传输扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.18" data-path="SPI参考手册/信息交换扩展.html"> |
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| <a href="SPI参考手册/信息交换扩展.html"> |
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| 6.18 信息交换扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.19" data-path="SPI参考手册/组网扩展.html"> |
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| <a href="SPI参考手册/组网扩展.html"> |
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| 6.19 组网扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.20" data-path="SPI参考手册/Telnet命令扩展.html"> |
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| <a href="SPI参考手册/Telnet命令扩展.html"> |
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| 6.20 Telnet命令扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.21" data-path="SPI参考手册/状态检查扩展.html"> |
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| <a href="SPI参考手册/状态检查扩展.html"> |
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| 6.21 状态检查扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.22" data-path="SPI参考手册/容器扩展.html"> |
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| <a href="SPI参考手册/容器扩展.html"> |
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| 6.22 容器扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.23" data-path="SPI参考手册/页面扩展.html"> |
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| <a href="SPI参考手册/页面扩展.html"> |
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| 6.23 页面扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.24" data-path="SPI参考手册/缓存扩展.html"> |
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| <a href="SPI参考手册/缓存扩展.html"> |
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| 6.24 缓存扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.25" data-path="SPI参考手册/验证扩展.html"> |
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| <a href="SPI参考手册/验证扩展.html"> |
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| 6.25 验证扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.26" data-path="SPI参考手册/日志适配扩展.html"> |
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| <a href="SPI参考手册/日志适配扩展.html"> |
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| 6.26 日志适配扩展 |
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| </a> |
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| </li> |
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| </ul> |
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| </li> |
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| <li class="chapter " data-level="1.8" data-path="技术兼容性测试.html"> |
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| <a href="技术兼容性测试.html"> |
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| 7 技术兼容性测试 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.9" data-path="公共契约.html"> |
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| <a href="公共契约.html"> |
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| 8 公共契约 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.10" data-path="坏味道.html"> |
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| <a href="坏味道.html"> |
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| 9 坏味道 |
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| </a> |
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| 10 编码约定 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.12" data-path="检查列表.html"> |
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| <a href="检查列表.html"> |
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| 11 检查列表 |
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| </a> |
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| <li class="chapter " data-level="1.13" data-path="设计原则.html"> |
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| <a href="设计原则.html"> |
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| 12 设计原则 |
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| </a> |
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| <h1> |
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| <a href="." >4 框架设计</a> |
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| <h4 id="整体设计">整体设计</h4> |
| <p><img src="sources/images/dubbo-framework.jpg" alt="/dev-guide/images/dubbo-framework.jpg"></p> |
| <p><strong>图例说明</strong></p> |
| <ul> |
| <li>图中左边淡蓝背景的为服务消费方使用的接口,右边淡绿色背景的为服务提供方使用的接口,位于中轴线上的为双方都用到的接口。</li> |
| <li>图中从下至上分为十层,各层均为单向依赖,右边的黑色箭头代表层之间的依赖关系,每一层都可以剥离上层被复用,其中,Service和Config层为API,其它各层均为SPI。</li> |
| <li>图中绿色小块的为扩展接口,蓝色小块为实现类,图中只显示用于关联各层的实现类。</li> |
| <li>图中蓝色虚线为初始化过程,即启动时组装链,红色实线为方法调用过程,即运行时调时链,紫色三角箭头为继承,可以把子类看作父类的同一个节点,线上的文字为调用的方法。</li> |
| </ul> |
| <p><strong>各层说明</strong></p> |
| <ul> |
| <li><code>config</code> 配置层,对外配置接口,以 <code>ServiceConfig</code>, <code>ReferenceConfig</code> 为中心,可以直接new配置类,也可以通过spring解析配置生成配置类</li> |
| <li><code>proxy</code> 服务代理层,服务接口透明代理,生成服务的客户端Stub和服务器端Skeleton, 以 <code>ServiceProxy</code> 为中心,扩展接口为 <code>ProxyFactory</code></li> |
| <li><code>registry</code> 注册中心层,封装服务地址的注册与发现,以服务URL为中心,扩展接口为 <code>RegistryFactory</code>, <code>Registry</code>, <code>RegistryService</code></li> |
| <li><code>cluster</code> 路由层,封装多个提供者的路由及负载均衡,并桥接注册中心,以 <code>Invoker</code> 为中心,扩展接口为 <code>Cluster</code>, <code>Directory</code>, <code>Router</code>, <code>LoadBalance</code></li> |
| <li><code>monitor</code> 监控层,RPC调用次数和调用时间监控,以Statistics为中心,扩展接口为 <code>MonitorFactory</code>, <code>Monitor</code>, <code>MonitorService</code></li> |
| <li><code>protocol</code> 远程调用层,封将RPC调用,以 <code>Invocation</code>, <code>Result</code> 为中心,扩展接口为 <code>Protocol</code>, <code>Invoker</code>, <code>Exporter</code></li> |
| <li><code>exchange</code> 信息交换层,封装请求响应模式,同步转异步,以 <code>Request</code>, <code>Response</code> 为中心,扩展接口为 <code>Exchanger</code>, <code>ExchangeChannel</code>, <code>ExchangeClient</code>, <code>ExchangeServer</code></li> |
| <li><code>transport</code> 网络传输层,抽象mina和netty为统一接口,以Message为中心,扩展接口为 <code>Channel</code>, <code>Transporter</code>, <code>Client</code>, <code>Server</code>, <code>Codec</code></li> |
| <li><code>serialize</code> 数据序列化层,可复用的一些工具,扩展接口为<code>Serialization</code>, <code>ObjectInput</code>, <code>ObjectOutput</code>, <code>ThreadPool</code></li> |
| </ul> |
| <p><strong>关系说明</strong></p> |
| <ul> |
| <li>在RPC中,Protocol是核心层,也就是只要有Protocol + Invoker + Exporter就可以完成非透明的RPC调用,然后在Invoker的主过程上Filter拦截点。</li> |
| <li>图中的Consumer和Provider是抽象概念,只是想让看图者更直观的了解哪些类分属于客户端与服务器端,不用Client和Server的原因是Dubbo在很多场景下都使用Provider, Consumer, Registry, Monitor划分逻辑拓普节点,保持统一概念。</li> |
| <li>而Cluster是外围概念,所以Cluster的目的是将多个Invoker伪装成一个Invoker,这样其它人只要关注Protocol层Invoker即可,加上Cluster或者去掉Cluster对其它层都不会造成影响,因为只有一个提供者时,是不需要Cluster的。</li> |
| <li>Proxy层封装了所有接口的透明化代理,而在其它层都以Invoker为中心,只有到了暴露给用户使用时,才用Proxy将Invoker转成接口,或将接口实现转成Invoker,也就是去掉Proxy层RPC是可以Run的,只是不那么透明,不那么看起来像调本地服务一样调远程服务。</li> |
| <li>而Remoting实现是Dubbo协议的实现,如果你选择RMI协议,整个Remoting都不会用上,Remoting内部再划为Transport传输层和Exchange信息交换层,Transport层只负责单向消息传输,是对Mina,Netty,Grizzly的抽象,它也可以扩展UDP传输,而Exchange层是在传输层之上封装了Request-Response语义。</li> |
| <li>Registry和Monitor实际上不算一层,而是一个独立的节点,只是为了全局概览,用层的方式画在一起。</li> |
| </ul> |
| <h4 id="模块分包">模块分包</h4> |
| <p><img src="sources/images/dubbo-modules.jpg" alt="/dev-guide/images/dubbo-modules.jpg"></p> |
| <p><strong>模块说明</strong></p> |
| <ul> |
| <li>dubbo-common 公共逻辑模块,包括Util类和通用模型。</li> |
| <li>dubbo-remoting 远程通讯模块,相当于Dubbo协议的实现,如果RPC用RMI协议则不需要使用此包。</li> |
| <li>dubbo-rpc 远程调用模块,抽象各种协议,以及动态代理,只包含一对一的调用,不关心集群的管理。</li> |
| <li>dubbo-cluster 集群模块,将多个服务提供方伪装为一个提供方,包括:负载均衡, 容错,路由等,集群的地址列表可以是静态配置的,也可以是由注册中心下发。</li> |
| <li>dubbo-registry 注册中心模块,基于注册中心下发地址的集群方式,以及对各种注册中心的抽象。</li> |
| <li>dubbo-monitor 监控模块,统计服务调用次数,调用时间的,调用链跟踪的服务。</li> |
| <li>dubbo-config 配置模块,是Dubbo对外的API,用户通过Config使用Dubbo,隐藏Dubbo所有细节。</li> |
| <li>dubbo-container 容器模块,是一个Standlone的容器,以简单的Main加载Spring启动,因为服务通常不需要Tomcat/JBoss等Web容器的特性,没必要用Web容器去加载服务。</li> |
| </ul> |
| <p>整体上按照分层结构进行分包,与分层的不同点在于:</p> |
| <ul> |
| <li>container为服务容器,用于部署运行服务,没有在层中画出。</li> |
| <li>protocol层和proxy层都放在rpc模块中,这两层是rpc的核心,在不需要集群时(只有一个提供者),可以只使用这两层完成rpc调用。</li> |
| <li>transport层和exchange层都放在remoting模块中,为rpc调用的通讯基础。</li> |
| <li>serialize层放在common模块中,以便更大程度复用。</li> |
| </ul> |
| <h4 id="依赖关系">依赖关系</h4> |
| <p><img src="sources/images/dubbo-relation.jpg" alt="/dev-guide/images/dubbo-relation.jpg"></p> |
| <p><strong>图例说明</strong></p> |
| <ul> |
| <li>图中小方块Protocol, Cluster, Proxy, Service, Container, Registry, Monitor代表层或模块,蓝色的表示与业务有交互,绿色的表示只对Dubbo内部交互。</li> |
| <li>图中背景方块Consumer, Provider, Registry, Monitor代表部署逻辑拓普节点。</li> |
| <li>图中蓝色虚线为初始化时调用,红色虚线为运行时异步调用,红色实线为运行时同步调用。</li> |
| <li>图中只包含RPC的层,不包含Remoting的层,Remoting整体都隐含在Protocol中。</li> |
| </ul> |
| <h4 id="调用链">调用链</h4> |
| <p>展开总设计图的红色调用链,如下:</p> |
| <p><img src="sources/images/dubbo-extension.jpg" alt="/dev-guide/images/dubbo-extension.jpg"></p> |
| <h4 id="暴露服务时序">暴露服务时序</h4> |
| <p>展开总设计图左边服务提供方暴露服务的蓝色初始化链,时序图如下:</p> |
| <p><img src="sources/images/dubbo-export.jpg" alt="/dev-guide/images/dubbo-export.jpg"></p> |
| <h4 id="引用服务时序">引用服务时序</h4> |
| <p>展开总设计图右边服务消费方引用服务的蓝色初始化链,时序图如下:</p> |
| <p><img src="sources/images/dubbo-refer.jpg" alt="/dev-guide/images/dubbo-refer.jpg"></p> |
| <h4 id="领域模型">领域模型</h4> |
| <p>在Dubbo的核心领域模型中:</p> |
| <ul> |
| <li>Protocol是服务域,它是Invoker暴露和引用的主功能入口,它负责Invoker的生命周期管理。</li> |
| <li>Invoker是实体域,它是Dubbo的核心模型,其它模型都向它靠扰,或转换成它,它代表一个可执行体,可向它发起invoke调用,它有可能是一个本地的实现,也可能是一个远程的实现,也可能一个集群实现。</li> |
| <li>Invocation是会话域,它持有调用过程中的变量,比如方法名,参数等。</li> |
| </ul> |
| <h4 id="基本原则">基本原则</h4> |
| <ul> |
| <li>采用Microkernel + Plugin模式,Microkernel只负责组装Plugin,Dubbo自身的功能也是通过扩展点实现的,也就是Dubbo的所有功能点都可被用户自定义扩展所替换。</li> |
| <li>采用URL作为配置信息的统一格式,所有扩展点都通过传递URL携带配置信息。</li> |
| </ul> |
| <p>更多设计原则参见:<a href="http://dubbo.io/Training-zh.htm#Training-zh-《框架设计原则》" target="_blank">框架设计原则</a></p> |
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