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| <li class="chapter " data-level="1.1" data-path="./"> |
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| Introduction |
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| 1 contribution |
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| <a href="源码构建.html"> |
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| 3 源码构建 |
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| </a> |
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| <li class="chapter " data-level="1.5" data-path="框架设计.html"> |
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| <a href="框架设计.html"> |
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| 4 框架设计 |
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| </a> |
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| <li class="chapter " data-level="1.6" data-path="扩展点加载.html"> |
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| <a href="扩展点加载.html"> |
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| 5 扩展点加载 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7" data-path="SPI参考手册/introduction.html"> |
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| <a href="SPI参考手册/introduction.html"> |
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| 6 SPI参考手册 |
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| </a> |
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| <ul class="articles"> |
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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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| <a href="SPI参考手册/协议扩展.html"> |
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| 6.1 协议扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.2" data-path="SPI参考手册/调用拦截扩展.html"> |
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| <a href="SPI参考手册/调用拦截扩展.html"> |
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| 6.2 调用拦截扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.3" data-path="SPI参考手册/引用监听扩展.html"> |
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| <a href="SPI参考手册/引用监听扩展.html"> |
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| 6.3 引用监听扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.4" data-path="SPI参考手册/暴露监听扩展.html"> |
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| <a href="SPI参考手册/暴露监听扩展.html"> |
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| 6.4 暴露监听扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.5" data-path="SPI参考手册/集群扩展.html"> |
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| <a href="SPI参考手册/集群扩展.html"> |
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| 6.5 集群扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.6" data-path="SPI参考手册/路由扩展.html"> |
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| <a href="SPI参考手册/路由扩展.html"> |
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| 6.6 路由扩展 |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.7.7" data-path="SPI参考手册/负载均衡扩展.html"> |
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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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| </li> |
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| <li class="chapter " data-level="1.7.8" data-path="SPI参考手册/合并结果扩展.html"> |
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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> |
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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> |
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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> |
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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> |
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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> |
| |
| <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> |
| |
| <li class="chapter " data-level="1.7.20" data-path="SPI参考手册/Telnet命令扩展.html"> |
| |
| <a href="SPI参考手册/Telnet命令扩展.html"> |
| |
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| 6.20 Telnet命令扩展 |
| |
| </a> |
| |
| |
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| </li> |
| |
| <li class="chapter " data-level="1.7.21" data-path="SPI参考手册/状态检查扩展.html"> |
| |
| <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 |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.7.22" data-path="SPI参考手册/容器扩展.html"> |
| |
| <a href="SPI参考手册/容器扩展.html"> |
| |
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| 6.22 容器扩展 |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.7.23" data-path="SPI参考手册/页面扩展.html"> |
| |
| <a href="SPI参考手册/页面扩展.html"> |
| |
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| 6.23 页面扩展 |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.7.24" data-path="SPI参考手册/缓存扩展.html"> |
| |
| <a href="SPI参考手册/缓存扩展.html"> |
| |
| |
| 6.24 缓存扩展 |
| |
| </a> |
| |
| |
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| </li> |
| |
| <li class="chapter " data-level="1.7.25" data-path="SPI参考手册/验证扩展.html"> |
| |
| <a href="SPI参考手册/验证扩展.html"> |
| |
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| 6.25 验证扩展 |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.7.26" data-path="SPI参考手册/日志适配扩展.html"> |
| |
| <a href="SPI参考手册/日志适配扩展.html"> |
| |
| |
| 6.26 日志适配扩展 |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| |
| </ul> |
| |
| </li> |
| |
| <li class="chapter " data-level="1.8" data-path="技术兼容性测试.html"> |
| |
| <a href="技术兼容性测试.html"> |
| |
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| 7 技术兼容性测试 |
| |
| </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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| |
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| </li> |
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| <li class="chapter active" 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 |
| |
| </a> |
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| <li class="chapter " data-level="1.11" data-path="编码约定.html"> |
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| <a href="编码约定.html"> |
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| 10 编码约定 |
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| </a> |
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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 |
| |
| </a> |
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| </li> |
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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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| <!-- Title --> |
| <h1> |
| <i class="fa fa-circle-o-notch fa-spin"></i> |
| <a href="." >9 坏味道</a> |
| </h1> |
| </div> |
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| <section class="normal markdown-section"> |
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| <blockquote> |
| <p><img src="sources/images/warning-3.gif" alt="warning">这里记录的是Dubbo设计或实现不优雅的地方。</p> |
| </blockquote> |
| <h4 id="url转换">URL转换</h4> |
| <h5 id="1-点对点暴露和引用服务">1. 点对点暴露和引用服务</h5> |
| <p>直接暴露服务: |
| EXPORT(dubbo://provider-address/com.xxx.XxxService?version=1.0.0")</p> |
| <p>点对点直连服务: |
| REFER(dubbo://provider-address/com.xxx.XxxService?version=1.0.0)</p> |
| <h5 id="2-通过注册中心暴露服务">2. 通过注册中心暴露服务</h5> |
| <p>向注册中心暴露服务: |
| EXPORT(registry://registry-address/com.alibaba.dubbo.registry.RegistrySerevice?registry=dubbo&export=ENCODE(dubbo://provider-address/com.xxx.XxxService?version=1.0.0))</p> |
| <p>获取注册中心: |
| url.setProtocol(url.getParameter("registry", "dubbo")) |
| GETREGISTRY(dubbo://registry-address/com.alibaba.dubbo.registry.RegistrySerevice)</p> |
| <p>注册服务地址: |
| url.getParameterAndDecoded("export")) |
| REGISTER(dubbo://provider-address/com.xxx.XxxService?version=1.0.0)</p> |
| <h5 id="3-通过注册中心引用服务">3. 通过注册中心引用服务</h5> |
| <p>从注册中心订阅服务: |
| REFER(registry://registry-address/com.alibaba.dubbo.registry.RegistrySerevice?registry=dubbo&refer=ENCODE(version=1.0.0))</p> |
| <p>获取注册中心: |
| url.setProtocol(url.getParameter("registry", "dubbo")) |
| GETREGISTRY(dubbo://registry-address/com.alibaba.dubbo.registry.RegistrySerevice)</p> |
| <p>订阅服务地址: |
| url.addParameters(url.getParameterAndDecoded("refer")) |
| SUBSCRIBE(dubbo://registry-address/com.xxx.XxxService?version=1.0.0)</p> |
| <p>通知服务地址: |
| url.addParameters(url.getParameterAndDecoded("refer")) |
| NOTIFY(dubbo://provider-address/com.xxx.XxxService?version=1.0.0)</p> |
| <h5 id="4-注册中心推送路由规则">4. 注册中心推送路由规则</h5> |
| <p>注册中心路由规则推送: |
| NOTIFY(route://registry-address/com.xxx.XxxService?router=script&type=js&rule=ENCODE(function{...}))</p> |
| <p>获取路由器: |
| url.setProtocol(url.getParameter("router", "script")) |
| GETROUTE(script://registry-address/com.xxx.XxxService?type=js&rule=ENCODE(function{...}))</p> |
| <h5 id="5-从文件加载路由规则">5. 从文件加载路由规则</h5> |
| <p>从文件加载路由规则: |
| GETROUTE(file://path/file.js?router=script)</p> |
| <p>获取路由器: |
| url.setProtocol(url.getParameter("router", "script")).addParameter("type", SUFFIX(file)).addParameter("rule", READ(file)) |
| GETROUTE(script://path/file.js?type=js&rule=ENCODE(function{...}))</p> |
| <h4 id="调用参数">调用参数</h4> |
| <ul> |
| <li>path 服务路径</li> |
| <li>group 服务分组</li> |
| <li>version 服务版本</li> |
| <li>dubbo 使用的dubbo版本</li> |
| <li>token 验证令牌</li> |
| <li>timeout 调用超时</li> |
| </ul> |
| <h4 id="扩展点的加载">扩展点的加载</h4> |
| <h5 id="1-自适应扩展点">1. 自适应扩展点</h5> |
| <p>ExtensionLoader加载扩展点时,会检查扩展点的属性(通过set方法判断),如该属性是扩展点类型,则会注入扩展点对象。因为注入时不能确定使用哪个扩展点(在使用时确定),所以注入的是一个自适应扩展(一个代理)。自适应扩展点调用时,选取一个真正的扩展点,并代理到其上完成调用。Dubbo是根据调用方法参数(上面有调用哪个扩展点的信息)来选取一个真正的扩展点。</p> |
| <p>在Dubbo给定所有的扩展点上调用都有URL参数(整个扩展点网的上下文信息)。自适应扩展即是从URL确定要调用哪个扩展点实现。URL哪个Key的Value用来确定使用哪个扩展点,这个信息通过的@Adaptive注解在方法上说明。</p> |
| <pre><code class="lang-java"><span class="hljs-meta">@Extension</span> |
| <span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">Car</span> </span>{ |
| <span class="hljs-meta">@Adaptive</span>({<span class="hljs-string">"http://10.20.160.198/wiki/display/dubbo/car.type"</span>, <span class="hljs-string">"http://10.20.160.198/wiki/display/dubbo/transport.type"</span>}) |
| <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">run</span><span class="hljs-params">(URL url, Type1 arg1, Type2 arg2)</span></span>; |
| } |
| </code></pre> |
| <p>由于自适应扩展点的上面的约定,ExtensionLoader会为扩展点自动生成自适应扩展点类(通过字节码),并将其实例注入。</p> |
| <p>ExtensionLoader生成的自适应扩展点类如下:</p> |
| <pre><code class="lang-java">package <扩展点接口所在包>; |
| |
| public class <扩展点接口名>$Adpative implements <扩展点接口> { |
| public <有@Adaptive注解的接口方法>(<方法参数>) { |
| if(是否有URL类型方法参数?) 使用该URL参数 |
| else if(是否有方法类型上有URL属性) 使用该URL属性 |
| # <else 在加载扩展点生成自适应扩展点类时抛异常,即加载扩展点失败!> |
| |
| if(获取的URL == null) { |
| throw new IllegalArgumentException("url == null"); |
| } |
| |
| 根据@Adaptive注解上声明的Key的顺序,从URL获致Value,作为实际扩展点名。 |
| 如URL没有Value,则使用缺省扩展点实现。如没有扩展点, throw new IllegalStateException("Fail to get extension"); |
| |
| 在扩展点实现调用该方法,并返回结果。 |
| } |
| |
| public <有@Adaptive注解的接口方法>(<方法参数>) { |
| throw new UnsupportedOperationException("is not adaptive method!"); |
| } |
| } |
| </code></pre> |
| <p>@Adaptive注解使用如下:</p> |
| <p>如果URL这些Key都没有Value,使用 用 缺省的扩展(在接口的Default中设定的值)。比如,String[] {"key1", "key2"},表示</p> |
| <p>先在URL上找key1的Value作为要Adapt成的Extension名; |
| key1没有Value,则使用key2的Value作为要Adapt成的Extension名。 key2没有Value,使用缺省的扩展。 如果没有设定缺省扩展,则方法调用会抛出IllegalStateException。 如果不设置则缺省使用Extension接口类名的点分隔小写字串。即对于Extension接口com.alibaba.dubbo.xxx.YyyInvokerWrapper的缺省值为String[] {"yyy.invoker.wrapper"}</p> |
| <h4 id="callback功能">Callback功能</h4> |
| <h5 id="1-参数回调">1. 参数回调</h5> |
| <p>主要原理:在一个Consumer->provider的长连接上,自动在Consumer端暴露一个服务(实现方法参数上声明的接口A),provider端便可反向调用到consumer端的接口实例.</p> |
| <p>实现细节:</p> |
| <ul> |
| <li>为了在传输时能够对回调接口实例进行转换,自动暴露与自动引用目前在DubboCodec中实现.此处需要考虑将此逻辑与codec逻辑分离.</li> |
| <li>在根据invocation信息获取exporter时,需要判断是否是回调,如果是回调,会从attachments中取得回调服务实例的id,在获取exporter,此处用于consumer端可以对同一个callback接口做不同的实现。</li> |
| </ul> |
| <h5 id="2-事件通知">2. 事件通知</h5> |
| <p>主要原理:Consumer在invoke方法时,判断如果有配置onreturn/onerror...则将onreturn对应的参数值(实例方法)加入到异步调用的回调列表中.</p> |
| <p>实现细节:参数的传递采用URL,但URL中没有支持string-object,所以将实例方法存储在staticMap中,此处实现需要进行改造,<a href="http://code.alibabatech.com/jira/browse/DUBBO-168" target="_blank">http://code.alibabatech.com/jira/browse/DUBBO-168</a></p> |
| <h4 id="lazy连接">Lazy连接</h4> |
| <p>DubboProtocol特有功能,默认关闭</p> |
| <p>当客户端与服务端创建代理时,暂不建立tcp长连接,当有数据请求时在做连接初始化</p> |
| <p>此项功能自动关闭连接重试功能,开启发送重试功能(即发送数据时如果连接已断开,尝试重新建立连接)</p> |
| <h4 id="共享连接">共享连接</h4> |
| <p>DubboProtocol特有功能,默认开启</p> |
| <p>JVM A暴露了多个服务,JVM B引用了A中的多个服务,共享连接是说A与B多个服务调用是通过同一个TCP长连接进行数据传输,已达到减少服务端连接数的目的.</p> |
| <p>实现细节:对于同一个地址由于使用了共享连接,那invoker的destroy就需要特别注意,一方面要满足对同一个地址refer的invoker全部destroy后,连接需要关闭,另一方面还需要注意如何避免部分invoker destroy时不能关闭连接。在实现中采用了引用计数的方案,但为了防范,在连接关闭时,重新建立了一个Lazy connection(称为幽灵连接),用于当出现异常场景时,避免影响业务逻辑的正常调用.</p> |
| <h4 id="sticky-策略">sticky 策略</h4> |
| <p>有多个服务提供者的情况下,配置了sticky后,在提供者可用的情况下,调用会继续发送到上一次的服务提供者. sticky策略默认开启了连接的lazy选项,用于避免开启无用的连接.</p> |
| <h4 id="服务提供者选择逻辑">服务提供者选择逻辑</h4> |
| <ol> |
| <li>存在多个服务提供者的情况下,首先根据Loadbalance进行选择,如果选择的provider处于可用状态,则进行后续调用</li> |
| <li>如果第一步选择的服务提供者不可用,则从剩余服务提供者列表中继续选择,如果可用,进行后续调用</li> |
| <li>如果所有的服务提供者都不可用,重新遍历整个列表(优先从没有选过的列表中选择),判断是否有可用的服务提供者(选择过程中,不可用的服务提供者可能会恢复到可用状态),如果有,则进行后续调用</li> |
| <li>如果第三步没有选择出可用的服务提供者,会选第一步选出的invoker中的下一个(如果不是最后一个),避免碰撞.</li> |
| </ol> |
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