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| <h1 class="page__title" itemprop="headline">秒杀开发历程（一） |
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| 少于 1 分钟 阅读 |
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| <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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