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| <h1 id="200">2.0.0 新特性介绍： 多配置中心支持</h1> |
| <p>很多热心的开发者给 2.0.0 贡献了很多新的特性， @GuoYL123 贡献了 servicecomb-kie 的支持， @160731liupf 贡献了 nacos |
| 的支持， 本文介绍开发者如何在自己的项目中使用这些配置中心。</p> |
| <h2 id="java-chassis">Java Chassis 配置源介绍和使用指南</h2> |
| <p>配置中心是微服务架构下一个非常重要的中间件，通过配置中心用户可以增加和删除配置信息，配置信息会通过不同的通知机制（通常包括 |
| PULL 和 PUSH）， 将配置的变化推送到微服务实例。 java-chassis 允许用户使用不同的配置中心， 目前支持用户使用如下几种配置中心：</p> |
| <ul> |
| <li>华为云配置中心</li> |
| </ul> |
| <p>华为云配置中心是华为云CSE产品的一个部件，java-chassis 最早使用它作为配置中心。 对接这个配置中心的代码在 config-cc 模块实现。 |
| 可以从<a href="https://cse-bucket.obs.myhwclouds.com/LocalCSE/Local-CSE-1.0.3.zip">轻量化微服务引擎</a>下载本地使用的版本。也可以 |
| 直接访问华为云 <a href="https://console.huaweicloud.com/servicestage">ServiceStage</a> 产品，使用在线的版本。</p> |
| <p>使用华为云配置中心，需要在项目中引入如下依赖：</p> |
| <pre><code class="language-xml"><dependency> |
| <groupId>org.apache.servicecomb</groupId> |
| <artifactId>config-cc</artifactId> |
| </dependency> |
| </code></pre> |
| <p>然后在配置文件 microservice.yaml 中增加如下配置项：</p> |
| <pre><code class="language-yaml">servicecomb: |
| config: |
| client: |
| serverUri: http://127.0.0.1:30113 |
| refreshMode: 0 |
| refresh_interval: 5000 |
| refreshPort: 30114 |
| </code></pre> |
| <p>华为云配置中心的其他配置项含义如下：</p> |
| <table> |
| <thead> |
| <tr> |
| <th>配置项名</th> |
| <th>描述</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>servicecomb.config.client.refreshMode</td> |
| <td>应用配置的刷新方式，<code>0</code>为config-center主动push，<code>1</code>为client周期pull，默认为<code>0</code></td> |
| </tr> |
| <tr> |
| <td>servicecomb.config.client.refreshPort</td> |
| <td>config-center推送配置的端口</td> |
| </tr> |
| <tr> |
| <td>servicecomb.config.client.tenantName</td> |
| <td>应用的租户名称</td> |
| </tr> |
| <tr> |
| <td>servicecomb.config.client.serverUri</td> |
| <td>config-center访问地址，格式为<code>http(s)://{ip}:{port}</code>，以<code>,</code>分隔多个地址</td> |
| </tr> |
| <tr> |
| <td>servicecomb.config.client.refresh_interval</td> |
| <td>pull模式下刷新配置项的时间间隔，单位为毫秒，默认值为30000</td> |
| </tr> |
| </tbody> |
| </table> |
| <ul> |
| <li>使用 servicecomb-kie</li> |
| </ul> |
| <p><a href="https://github.com/apache/servicecomb-kie">servicecomb-kie</a> 是全新设计的配置中心。 |
| 从 2.0.0 版本开始， java-chassis 支持使用 servicecomb-kie。 |
| 从 2.0.1 版本开始， java-chassis 默认使用long polling 拉取 servicecomb-kie 配置，来节省间隔轮询带来的网络消耗。 |
| servicecomb-kie 的安装指导可以参考官网文档。 在 java-chassis 中使用 servicecomb-kie， 需要引入下面的依赖：</p> |
| <pre><code class="language-xml"><dependency> |
| <groupId>org.apache.servicecomb</groupId> |
| <artifactId>config-kie</artifactId> |
| </dependency> |
| </code></pre> |
| <p>然后在配置文件 microservice.yaml 中增加如下配置项：</p> |
| <pre><code class="language-yaml">servicecomb: |
| kie: |
| serverUri: http://127.0.0.1:30110 |
| refresh_interval: 5000 |
| firstRefreshInterval: 5000 |
| domainName: default |
| </code></pre> |
| <p>servicecomb-kie 的配置项及其含义如下：</p> |
| <table> |
| <thead> |
| <tr> |
| <th>配置项名</th> |
| <th>描述</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>servicecomb.kie.domainName</td> |
| <td>区域名称，默认为default</td> |
| </tr> |
| <tr> |
| <td>servicecomb.kie.serverUri</td> |
| <td>servicecomb-kie访问地址，格式为<code>http(s)://{ip}:{port}</code>，以<code>,</code>分隔多个地址</td> |
| </tr> |
| <tr> |
| <td>servicecomb.kie.refresh_interval</td> |
| <td>pull模式下刷新配置项的时间间隔，单位为毫秒，默认值为3000</td> |
| </tr> |
| <tr> |
| <td>servicecomb.kie.firstRefreshInterval</td> |
| <td>pull模式下启动过程中首次刷新时间间隔，单位为毫秒，默认值为3000</td> |
| </tr> |
| </tbody> |
| </table> |
| <ul> |
| <li>使用 nacos</li> |
| </ul> |
| <p><a href="https://github.com/alibaba/nacos">nacos</a> 是 alibaba 提供的配置中心。 java-chassis 从 2.0.0 版本支持 nacos。 |
| nacos的下载安装请参考官网介绍。 </p> |
| <p>使用nacos，需要在项目中引入如下依赖：</p> |
| <pre><code class="language-xml"><dependency> |
| <groupId>org.apache.servicecomb</groupId> |
| <artifactId>config-nacos</artifactId> |
| </dependency> |
| </code></pre> |
| <p>然后在配置文件 microservice.yaml 中增加如下配置项：</p> |
| <pre><code class="language-yaml">servicecomb: |
| nacos: |
| serverUri: http://127.0.0.1:8848 |
| group: DEFAULT_GROUP |
| dataId: example |
| </code></pre> |
| <ul> |
| <li>使用 Apollo</li> |
| </ul> |
| <p><a href="https://github.com/ctripcorp/apollo">Apollo</a> 是携程框架部门研发的分布式配置中心。 Apollo的下载安装请参考官网介绍。 </p> |
| <pre><code class="language-xml"><dependency> |
| <groupId>org.apache.servicecomb</groupId> |
| <artifactId>config-apollo</artifactId> |
| </dependency> |
| </code></pre> |
| <p>然后在配置文件 microservice.yaml 中增加如下配置项：</p> |
| <pre><code class="language-yaml">apollo: |
| config: |
| serverUri: http://127.0.0.1:8070 |
| serviceName: apollo-test |
| env: DEV |
| clusters: test-cluster |
| namespace: application |
| token: xxx |
| refreshInterval: 30 |
| firstRefreshInterval: 0 |
| </code></pre> |
| <h2 id="_1">参与配置源的开发和贡献</h2> |
| <p>2.0.0 版本提供了4种配置源的支持， 如果采用 Spring Boot 运行模式， 由于 Java Chassis 继承和适配了 Spring Boot 的 |
| 配置源， 因此 Spring Boot 采用的配置源也可以平滑的被 Java Chassis 应用程序使用。 比如 Java Chassis 在 Spring Boot |
| 集成模式下使用 application.yml 作为配置文件， 可以使用 git 作为动态配置源。 </p> |
| <p>因此， Java Chassis 已经支持大部分开发者能够使用的配置源。 然而，目前的支持仍然是不够的， 每一个不同的配置中心 |
| 都提供了非常独特的功能， Java Chassis 只是集成了它们极少的核心功能， 维护一个配置中心的支持，需要长期大量的应用 |
| 验证，才能够把功能做的稳定和强大。 因此，配置中心的支持还需要开发者帮助持续的贡献代码。</p> |
| <p>Java Chassis 的配置扩展是基于 <a href="https://github.com/Netflix/archaius">archaius</a>， 开发者只需要实现 <code>ConfigCenterConfigurationSource</code>, |
| 即可以接入其他配置中心。 Java Chassis 的源码目录 config-cc， config-apollo, config-kie, config-nacos 分别实现了 |
| 这个接口。 </p> |
| <ul> |
| <li><a href="https://github.com/apache/servicecomb-java-chassis/pull/1405">nacos 支持PR</a></li> |
| <li><a href="https://github.com/apache/servicecomb-java-chassis/pull/1518">servicecomb-kie 支持PR</a></li> |
| <li><a href="http://localhost:8000/config/general-config/">Java Chassis 通用配置说明</a></li> |
| </ul> |
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