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Posted to commits@servicecomb.apache.org by ni...@apache.org on 2017/12/12 09:18:31 UTC
[34/57] [partial] incubator-servicecomb-website git commit: Generated
the static pages for asf-site
http://git-wip-us.apache.org/repos/asf/incubator-servicecomb-website/blob/08e1b43f/content/cn/docs/quick-start/index.html
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+ <meta itemprop="headline" content="快速入门">
+ <meta itemprop="description" content="介绍如何使用Java Chassis框架快速运行微服务应用">
+
+ <meta itemprop="dateModified" content="September 03, 2017">
+
+ <div class="page__inner-wrap">
+
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+ <header>
+ <h1 class="page__title" itemprop="headline">快速入门
+</h1>
+
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+
+
+ <section class="page__content" itemprop="text">
+ <aside class="sidebar__right">
+<nav class="toc">
+ <!-- <header><h4 class="nav__title"><i class="fa fa-file-text"></i> 在本页上</h4></header> -->
+<ul class="toc__menu" id="markdown-toc">
+ <li><a href="#安装-java-开发环境" id="markdown-toc-安装-java-开发环境">安装 Java 开发环境</a></li>
+ <li><a href="#运行-service-center" id="markdown-toc-运行-service-center">运行 Service Center</a></li>
+ <li><a href="#创建第一个微服务" id="markdown-toc-创建第一个微服务">创建第一个微服务</a></li>
+ <li><a href="#运行微服务应用" id="markdown-toc-运行微服务应用">运行微服务应用</a></li>
+ <li><a href="#下一步" id="markdown-toc-下一步">下一步</a></li>
+</ul>
+
+ </nav>
+</aside>
+
+<h2 id="安装-java-开发环境">安装 Java 开发环境</h2>
+
+<ul>
+ <li>
+ <p>安装<strong>git</strong>，详情可参考<a href="https://git-scm.com/book/zh/v2/%E8%B5%B7%E6%AD%A5-%E5%AE%89%E8%A3%85-Git" target="_blank">git安装教程</a>。</p>
+ </li>
+ <li>
+ <p>安装JDK 1.8，详情可参考<a href="https://docs.oracle.com/javase/8/docs/technotes/guides/install/install_overview.html" target="_blank">JDK安装教程</a>。</p>
+ </li>
+ <li>
+ <p>安装Maven 3.x，详情可参考<a href="https://maven.apache.org/install.html" target="_blank">Maven安装教程</a>。</p>
+ </li>
+ <li>
+ <p>安装 ServiceComb Java Chassis(SDK)，执行以下指令：</p>
+
+ <div class="language-bash highlighter-rouge"><pre class="highlight"><code> git clone https://github.com/ServiceComb/ServiceComb-Java-Chassis.git
+ <span class="nb">cd </span>ServiceComb-Java-Chassis
+ mvn clean install -DskipTests
+</code></pre>
+ </div>
+ </li>
+</ul>
+
+<h2 id="运行-service-center">运行 Service Center</h2>
+<p>在 <strong>ServiceComb</strong> 微服务框架中，<strong>Service Center</strong> 提供服务注册及服务发现功能，可直接使用 Docker 运行。</p>
+<div class="language-bash highlighter-rouge"><pre class="highlight"><code>docker pull servicecomb/service-center
+docker run -d -p 30100:30100 servicecomb/service-center:latest
+</code></pre>
+</div>
+<p><em>您可以通过阅读<a href="/cn/users/setup-environment/#运行service-center">环境配置</a>获取在本地以二进制方式运行Service Center的方法。</em></p>
+
+<h2 id="创建第一个微服务">创建第一个微服务</h2>
+<p>本指南将以一个简单的 <strong>体质指数(BMI)</strong> 应用开展微服务之旅。<a href="https://baike.baidu.com/item/BMI%E6%8C%87%E6%95%B0" target="_blank">体质指数</a>主要用于衡量人体胖瘦程度。该应用主要包含两个微服务：</p>
+
+<ul>
+ <li>
+ <p><strong>体质指数计算器</strong>：负责处理运算事务。</p>
+ </li>
+ <li>
+ <p><strong>体质指数界面</strong>：提供用户界面及网关服务。</p>
+ </li>
+</ul>
+
+<p>其运行流程为：<br />
+<img src="/assets/images/quick-start-sample-workflow.png" alt="体质指数应用运行流程" class="align-center" /></p>
+
+<p>其中，虚线表示服务注册及服务发现的过程。</p>
+
+<h2 id="运行微服务应用">运行微服务应用</h2>
+
+<ol>
+ <li>
+ <p>进入 <strong>体质指数</strong> 应用代码目录。</p>
+
+ <div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="nb">cd </span>samples/bmi
+</code></pre>
+ </div>
+ <p><strong>注意</strong>：在windows开发环境下，docker是在虚拟机中启动，因此需要修改微服务的 <strong>Service Center</strong> IP地址为虚拟机IP地址。修改2个配置文件[calculator|webapp]/src/main/resources/microservice.yaml，将其中<a>http://127.0.0.1:30100</a>修改为<a>http://192.168.99.100:30100</a>，其中192.168.99.100是虚拟机IP，需要与开发环境中的虚拟机IP保持一致。</p>
+ </li>
+ <li>
+ <p>启动 <strong>体质指数计算器</strong> 和 <strong>体质指数界面</strong> 微服务，分别执行以下指令：</p>
+
+ <div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="nb">cd </span>calculator; mvn spring-boot:run
+<span class="nb">cd </span>webapp; mvn spring-boot:run
+</code></pre>
+ </div>
+ </li>
+ <li>
+ <p>验证服务。微服务启动完毕后，即可通过 <a>http://localhost:8889</a> 访问 <strong>体质指数</strong> 应用，届时将能看到如下界面，并可输入您的身高和体重信息验证服务是否正常运行。</p>
+
+ <p><img src="/assets/images/bmi-interface.png" alt="体质指数应用运行界面" class="align-center" /></p>
+ </li>
+</ol>
+
+<h2 id="下一步">下一步</h2>
+
+<ul>
+ <li>阅读<a href="/cn/docs/quick-start-bmi/"><strong>体质指数</strong>微服务应用快速开发</a>。</li>
+</ul>
+
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+ <ul>
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+ <li><a href="https://github.com/ServiceComb/ServiceComb.github.io/issues/new?title=Issue with _docs/cn/quick-start.md">报告本网页问题</a></li>
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+ <a href="https://groups.google.com/forum/#!forum/servicecomb-users" target="_blank">用户</span></a>
+ </li>
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http://git-wip-us.apache.org/repos/asf/incubator-servicecomb-website/blob/08e1b43f/content/cn/docs/seckill-development-journey-part-I/index.html
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+ <meta itemprop="headline" content="秒杀开发历程（一）">
+ <meta itemprop="description" content="介绍如何一步一步构建秒杀项目的过程">
+ <meta itemprop="datePublished" content="August 26, 2017">
+ <meta itemprop="dateModified" content="September 13, 2017">
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+ <div class="page__inner-wrap">
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+ <header>
+ <h1 class="page__title" itemprop="headline">秒杀开发历程（一）
+</h1>
+
+ <p class="page__meta"><i class="fa fa-clock-o" aria-hidden="true"></i>
+
+
+
+
+ 少于 1 分钟 阅读
+
+</p>
+
+ </header>
+
+
+
+ <section class="page__content" itemprop="text">
+ <h2 id="概述">概述</h2>
+<p> 秒杀是我们ServiceComb开源团队以领域驱动设计（<a href="https://en.wikipedia.org/wiki/Domain-driven_design">DDD</a>）为背景，如何从零开始构建一个微服务架构的示例项目。在这个过程中，您可以学习到微服务架构区别于传统单体程序架构的诸多特点，同时我们还将使用敏捷开发的模式快速构建它。</p>
+
+<h2 id="背景">背景</h2>
+<p> 秒杀的需求起源于互联网常见的促销方式——支付订单的时候，我们可以支持使用优惠券获得一些折扣，由于优惠券的数量是非常有限的，所以我们必须提供一个平台，让每一位希望得到它的人公平竞争，这样的场景我相信在平日的生活中随处可见。</p>
+
+<p> 由于秒杀是一个示例项目，所以我们不希望它太复杂，真实的秒杀活动需要考虑的细节要远远超过我们的想象；我们也不希望它太过于具体在特定的形式，例如优惠券、满减、抢购码，等等，这样总会让部分读者难以理解；最后，我们使用了先到先得这种最原始的策略，如果您想尝试其他策略，可以下载代码自行修改，我相信也不会太困难。</p>
+
+<h2 id="初次设计">初次设计</h2>
+<p> 首先我们分析客户核心业务述求：</p>
+
+<ol>
+ <li>客户可以请求秒杀一张优惠券，系统返回获取优惠券成功或失败（已经被秒光了）；</li>
+ <li>客户可以查询自己目前有多少张优惠券；</li>
+</ol>
+
+<p> 那么我们开始吧，等等，您说这个描述也太简单了？客户还没有登录系统呢，秒杀活动又是怎么来的，怎么开始的？客户是请求哪个活动的优惠券呀？折扣是不是不一样？还有……</p>
+
+<p> 确实，我们习惯于在一开始就思考很多，一些较大的系统，可能设计阶段就要几个月，但是这次可以不用考虑太多，因为我认为：</p>
+<ol>
+ <li>设计太多并不能保证构建完毕后就一定能完全符合需求，唯一不变的就是需求总是变化，所以不要过度设计；</li>
+ <li>微服务架构的原则是组件（服务）提供较为单一的功能，所以每个组件所需要实现的功能范围比较小，不必先将所有的功能都设计出来；</li>
+ <li>应该尽快切入主题，也就是立刻去解决核心域的问题。</li>
+</ol>
+
+<p> 现在，我们需要使用正确的“姿势”完成设计过程——遵循领域驱动设计（<a href="https://en.wikipedia.org/wiki/Domain-driven_design">DDD</a>）的诸多原则，设计过程的核心就是识别出实体、值对象和服务等元素，进一步寻找聚合；由于我们的需求非常简单，所以很容易就能将它们找出来：</p>
+<ul>
+ <li>实体：促销秒杀（Promotion）</li>
+ <li>值对象：优惠券（Coupon），促销秒杀事件（PromotionEvent）</li>
+ <li>领域服务：秒杀活动（SecKill）</li>
+</ul>
+
+<p> 之后我们分析他们之间的聚合，分出两个微服务，为了能快速达到目的，它们之间直接使用MySQL共享数据（微服务推荐使用独立的存储，我们未来去改造）：</p>
+<ol>
+ <li>Command：SecKill领域服务；</li>
+ <li>Query： Coupon值对象查询</li>
+</ol>
+
+<p><img src="/assets/images/seckill-develop-course-part-I-arth.png" alt="图1 初次架构" class="align-center" /></p>
+
+<h2 id="功能实现">功能实现</h2>
+<p> 秒杀的代码托管在<a href="https://github.com/ServiceComb/seckill">Github</a>，欢迎Watch和Star。</p>
+
+<h3 id="command微服务的实现">Command微服务的实现</h3>
+<p> 我们设计了SecKillCommandService和SecKillPersistentRunner两个类分别完成秒杀处理和结果持久化，考虑到持久化速度慢，我们使用BlockQueue做缓存；另外设计了SecKillCommandRestController作为客户请求的Endpoint；ServiceComb支持多种编程模型和通信模型，我们使用目前较较为流行的Spring Boot Rest作为基础框架，如果您的程序也使用了它，那么只需要稍加调整即可无缝上云。</p>
+
+<p><img src="/assets/images/seckill-develop-course-part-I-command.png" alt="图2 Command微服务组件" class="align-center" /></p>
+
+<h2 id="query微服务的实现">Query微服务的实现</h2>
+<p> 查询逻辑较简单，因为PromotionEvent是值对象，我们使用了PromotionEvent推导Coupon，各位看官读读代码就明白了。</p>
+
+<h2 id="构建支撑域">构建支撑域</h2>
+<p> Promotion是实体，诚然，就像一开始提到的，我们需要在另外一个领域去管理（构建）它才能开始后面的秒杀活动，由于我们直接切入核心域展开工作，支撑域和普通域部分目前我们通过Spring注入固定对象来完成，例如：</p>
+
+<p><img src="/assets/images/seckill-develop-course-part-I-spring.png" alt="图3 支撑域注入" class="align-center" /></p>
+
+<h2 id="功能验证">功能验证</h2>
+<p> 最后，我们使用PostMan体验完成的功能，请注意Body的填写使用JSON格式，并且类型选择JSON(application/json)：</p>
+<h3 id="请求秒杀">请求秒杀</h3>
+
+<p><img src="/assets/images/seckill-develop-course-part-I-request-seckill.png" alt="图4 请求秒杀" class="align-center" /></p>
+
+<h3 id="查询拥有的优惠券">查询拥有的优惠券</h3>
+
+<p><img src="/assets/images/seckill-develop-course-part-I-query-coupons.png" alt="图5 查询拥有的优惠券" class="align-center" /></p>
+
+
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+ <p class="page__date"><strong><i class="fa fa-fw fa-calendar" aria-hidden="true"></i> 最新的:</strong> <time datetime="2017-09-13">2017年9月13日</time></p>
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+ <meta itemprop="headline" content="秒杀开发历程（二）">
+ <meta itemprop="description" content="介绍如何一步一步构建秒杀项目的过程">
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+</h1>
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+
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+
+
+ 少于 1 分钟 阅读
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+
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+
+
+
+ <section class="page__content" itemprop="text">
+ <p> <a href="/cn/docs/seckill-development-journey-part-I/">上文</a> 中我们构建了一个仅具有核心功能的秒杀框架，本篇中我们会逐步完善一些功能，使得它具备完整的基础功能。</p>
+
+<h2 id="问题点完善范围">问题点（完善范围）</h2>
+<p> 回顾设计和参照已完成的部分，我们可以发现：</p>
+<ol>
+ <li>没有提供Promotion实体的服务（Promotion是固定通过Spring注入的）；</li>
+ <li>缺乏一些基本的业务检查和功能，包括：
+ <ul>
+ <li>同一个客户在同一个Promotion中只能秒杀一次（不允许重复）</li>
+ <li>同时可以有多个Promotion进行（折扣不同，数量也不同）</li>
+ </ul>
+ </li>
+ <li>如果Command微服务故障，再次恢复后，需要恢复未完成正在进行中的秒杀活动。</li>
+</ol>
+
+<p> 也许您会说，客户管理和客户登录为什么没有罗列出来？的确，客户在我们的场景中是不可或缺的，但是我们为了简化设计，没有包含登录以及请求认证的内容，如果对这方面感兴趣您可以移步到ServiceComb的Company示例实现了一个简单基于token的认证方式，地址在<a href="https://github.com/ServiceComb/ServiceComb-Company-WorkShop">Company</a>。</p>
+
+<h2 id="再次设计">再次设计</h2>
+<p> 对于实体，领域驱动设计（<a href="https://en.wikipedia.org/wiki/Domain-driven_design">DDD</a>）推荐使用独立接口，因此我们设计一个新的Admin微服务来提供服务：</p>
+
+<p><img src="/assets/images/seckill-develop-course-part-II-arth.png" alt="图1 增加了Admin微服务后的架构" class="align-center" /></p>
+
+<h2 id="功能实现">功能实现</h2>
+<h3 id="admin微服务的实现">Admin微服务的实现</h3>
+<p> Admin微服务紧紧围绕Promotion实体提供服务，我们完全可以映射到对应的REST方式，即：</p>
+<ul>
+ <li>新增Promotion对应Post； </li>
+ <li>修改Promotion对应Put； </li>
+ <li>查询Promotion对应Get； </li>
+ <li>删除Promotion对应Delete。 </li>
+</ul>
+
+<p> 满足当前的需求只需要完成Post和Put就可以了，另外，考虑到已经开始的秒杀活动不应该能修改，我们增加了对应的检查逻辑。</p>
+
+<h3 id="检查和功能的实现">检查和功能的实现</h3>
+<p> 通过增加一个HashSet检查客户是否重复秒杀成功；<br />
+ 构建SecKillPromotionBootstrap作为Promotion启动的管理器用于支持多个Promotion同时进行，将SecKillCommandService和SecKillPersistentRunner使用集合管理。</p>
+
+<h3 id="command微服务故障恢复的实现">Command微服务故障恢复的实现</h3>
+<p> 构建SecKillRecoveryService处理Promotion恢复检查，未完成的Promotion无论是未开始的还是进行中的，都需要它完成检查返回正确的恢复信息，信息包括剩余券数、已秒杀成功的客户列表等。</p>
+
+<h2 id="功能验证">功能验证</h2>
+<p> 最后，我们使用PostMan体验完成的功能，请注意Body的填写使用JSON格式，并且类型选择JSON(application/json)：</p>
+<h3 id="创建秒杀活动">创建秒杀活动</h3>
+
+<p><img src="/assets/images/seckill-develop-course-part-II-create-promotion.png" alt="图2 创建秒杀活动" class="align-center" /></p>
+
+<h3 id="查询正在进行的秒杀活动">查询正在进行的秒杀活动</h3>
+
+<p><img src="/assets/images/seckill-develop-course-part-II-query-active-promotion.png" alt="图3 查询正在进行的秒杀活动" class="align-center" /></p>
+
+<h3 id="拒绝重复秒杀">拒绝重复秒杀</h3>
+
+<p><img src="/assets/images/seckill-develop-course-part-II-reject-duplicate-grab.png" alt="图4 拒绝重复秒杀" class="align-center" /></p>
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+ <p class="page__date"><strong><i class="fa fa-fw fa-calendar" aria-hidden="true"></i> 最新的:</strong> <time datetime="2017-09-13">2017年9月13日</time></p>
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