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| 多协议介绍 |
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| REST over Servlet(WAR) |
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| Highway |
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| 使用Service Center |
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| 使用Nacos |
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| <li class="md-nav__item"> |
| <a href="../registry/zookeeper.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 使用ZooKeeper |
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| <a href="../registry/local-registry.html" class="md-nav__link"> |
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| 本地注册发现 |
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| <a href="../registry/distributed.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 去中心化注册发现 |
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| <span class="md-ellipsis"> |
| 多样化的配置管理功能 |
| </span> |
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| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_13_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_13"> |
| <span class="md-nav__icon md-icon"></span> |
| 多样化的配置管理功能 |
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| <ul class="md-nav__list" data-md-scrollfix> |
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| 服务配置介绍 |
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| <a href="../config/read-config.html" class="md-nav__link"> |
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| 在程序中读取配置信息 |
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| <li class="md-nav__item"> |
| <a href="../config/kie.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 使用Kie |
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| <a href="../config/nacos.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 使用Nacos |
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| <li class="md-nav__item"> |
| <a href="../config/zookeeper.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 使用Zookeeper |
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| <li class="md-nav__item"> |
| <a href="../config/apollo.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 使用Apollo |
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| <a href="../config/cse1.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 使用CSE1.0配置中心 |
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| <h1 id="_1">理解服务契约</h1> |
| <p>servicecomb 的核心设计理念是 <code>以契约为中心</code>，契约是微服务系统运行和治理的基础。 可以将契约理解为基 |
| 于 OpenAPI 规范的微服务接口描述。java chassis 提供了两种方式定义契约：<code>code first</code> 和 |
| <code>contract first</code> 。</p> |
| <ul> |
| <li>code first</li> |
| </ul> |
| <p>开发者首先通过 JAVA 代码定义接口信息，servicecomb 会根据代码定义，生成以 yaml 文件描述的 OpenAPI |
| 文档。 servicecomb 支持使用 <code>JAX-RS</code>, <code>Spring MVC</code> 等 REST Annotation 描述接口信息，还可以通过 |
| swagger API 补充其他接口信息。 在使用 <code>RPC</code> 方式定义接口的时候， 系统会按照默认的规则生成接口描述， |
| 也可以使用这些标签修饰接口信息，让契约信息更加容易阅读和理解。</p> |
| <ul> |
| <li>contract first</li> |
| </ul> |
| <p>开发者先通过契约编辑器书写 yaml 格式的接口描述，然后通过代码生成工具，生成项目代码。这种方式通常 |
| 需要定义一套标准的软件工程规范，并提供相关的工具支持。这种方式更加容易实现接口规范管理，实现测试自动化 |
| 等软件工程流程。</p> |
| <p>由于 <code>contract first</code> 实践起来，需要配套的管理过程和工具体系支持，这里不详细描述， |
| 本章节简单描述如何书写契约。后续的章节会描述使用 <code>code first</code> 的开发细节。</p> |
| <h1 id="contract-first">contract first 开发步骤简要描述</h1> |
| <p>ServiceComb 使用 yaml 文件格式定义服务契约，推荐使用<a href="http://editor.swagger.io/#/">Swagger Editor</a>工具来编写契约， |
| 可检查语法格式及自动生成API文档。详细的契约文件格式请参考<a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md">OpenAPI官方文档</a>。</p> |
| <p>契约文件放置在 <code>resources/microservices</code> 或者 <code>resources/application</code> 目录下，目录结构如下所示。</p> |
| <pre><code class="language-yaml">resources |
| - microservices |
| - serviceName #微服务名 |
| - schemaId.yaml #schema接口的契约 |
| - applications |
| - appId #应用ID |
| - serviceName #微服务名 |
| - schemaId.yaml #schema接口的契约 |
| </code></pre> |
| <p>ServiceComb的Swagger契约文件应当使用UTF-8字符集保存。如果当用户使用其他字符集保存契约文件，且文 |
| 件中包含中文字符时，可能会导致未知错误。</p> |
| <h2 id="_2">示例代码</h2> |
| <p><code>resources/microservices</code>目录和<code>resources/application</code> 目录下的schemaId.yaml文件内容示例如下。</p> |
| <pre><code class="language-yaml">swagger: '2.0' |
| info: |
| title: hello |
| version: 1.0.0 |
| x-java-interface: org.apache.servicecomb.samples.common.schema.Hello |
| basePath: /springmvchello |
| produces: |
| - application/json |
| |
| paths: |
| /sayhi: |
| post: |
| operationId: sayHi |
| parameters: |
| - name: name |
| in: query |
| required: true |
| type: string |
| responses: |
| 200: |
| description: 正确返回 |
| schema: |
| type: string |
| default: |
| description: 默认返回 |
| schema: |
| type: string |
| /sayhello: |
| post: |
| operationId: sayHello |
| parameters: |
| - name: person |
| in: body |
| required: true |
| schema: |
| $ref: "#/definitions/Person" |
| responses: |
| 200: |
| description: 正确返回 |
| schema: |
| type: string |
| default: |
| description: 默认返回 |
| schema: |
| type: string |
| definitions: |
| Person: |
| type: "object" |
| properties: |
| name: |
| type: "string" |
| description: "person name" |
| xml: |
| name: "Person" |
| </code></pre> |
| <p>ServiceComb中的契约，basePath不需要包含web container的web root，以及servlet的url pattern。 |
| 因为ServiceComb支持部署解耦，既可以脱离servlet container独立部署，也可使用war的方式部署 |
| 到servlet container中，还可以使用embedded servlet container的方式运行。 |
| 部署方式修改导致的实际url变更，ServiceComb consumer业务代码并不需要感知，框架会自动适配。 </p> |
| <p>说明：</p> |
| <ul> |
| <li>info.x-java-interface需要标明具体的接口路径，根据项目实际情况而定。该信息主要是为了和老版本兼容， |
| 新版本可以不需要指定。</li> |
| <li>SchemaId中可以包含"."字符，但不推荐这样命名。这是由于ServiceComb使用的配置文件是yaml格式的， |
| "."符号用于分割配置项名称，如果SchemaId中也包含了"."可能会导致一些支持契约级别的配置无法正确被识别。</li> |
| <li>OperationId的命名中不可包含"."字符。</li> |
| </ul> |
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