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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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