【得物技术】供应链库存幂等实战分享

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"日常工作中,很多场景需要我们保证系统操作的幂等性,先来了解下什么是幂等。  ","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"引自百度百科:","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"幂等(idempotent、idempotence)是一个数学与计算机学概念,常见于抽象代数中。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong","attrs":{}}],"text":"在编程中一个幂等操作的特点是其任意多次执行所产生的影响均与一次执行的影响相同。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/ec/ecf85c886cdecd68a876dd56e79b004f.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"引自维基百科:","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"    Idempotence is the property of certain operations in mathematics and computer science whereby ","attrs":{}},{"type":"text","marks":[{"type":"strong","attrs":{}}],"text":"they can be applied multiple times without changing the result beyond the initial application","attrs":{}},{"type":"text","text":". The concept of idempotence arises in a number of places in abstract algebra (in particular, in the theory of projectors and closure operators) and functional programming (in which it is connected to the property of referential transparency).","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"幂等理解总结:","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"我们提取一下关键信息:","attrs":{}},{"type":"text","marks":[{"type":"strong","attrs":{}}],"text":"一个幂等操作的特点是其任意多次执行所产生的影响均与一次执行的影响相同。明确目标,在服务不出错的情况下,尽量去达成这个目标。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"实战背景","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"外部系统对接库存操作时,所有带业务含义的操作只能生效一次,否则会因为一些流量重放等操作导致库存紊乱。由于业务场景的需要,此时就需要保证接口的幂等性。如果针对每个接口单独去做幂等,非常费力,而且需要考虑业务的边边角角。除此之外,每个业务开发同学在针对不同场景写的幂等方案可能也不尽相同,后期维护成本也较高。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"在此背景之下,我们想设计一个公共的幂等组件,想达成以下几个目标,达成的目标越多越好。","attrs":{}}]},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"目标","attrs":{}}]},{"type":"numberedlist","attrs":{"start":null,"normalizeStart":1},"content":[{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":1,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong","attrs":{}}],"text":"通用性","attrs":{}},{"type":"text","text":",尽量满足所有幂等场景,大部分幂等场景都支持","attrs":{}}]}],"attrs":{}},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":2,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong","attrs":{}}],"text":"易用性","attrs":{}},{"type":"text","text":",使用简单,如果学习成本太高,对于开发者来说,还不如自己写一个","attrs":{}}]}],"attrs":{}},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":3,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong","attrs":{}}],"text":"代码无侵入性","attrs":{}},{"type":"text","text":",如果代码侵入太多,会导致代码不够优雅,美观,拖拖拉拉。且影响代码的可阅读性和后期维护性","attrs":{}}]}],"attrs":{}},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":4,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong","attrs":{}}],"text":"独立性","attrs":{}},{"type":"text","text":",依赖尽量少,量级要足够轻(否则因为需要引入幂等组件,项目中引入一堆无用的内容进来,对原本的业务流程造成较大的影响。例如,一个接口平均耗时100ms,引入这个组件后,变成了200ms,耗时直接double,这个是绝对不能容忍的)","attrs":{}}]}],"attrs":{}},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":5,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong","attrs":{}}],"text":"易拓展性","attrs":{}},{"type":"text","text":",方便后期迭代维护","attrs":{}}]}],"attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"设计思路","attrs":{}}]},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/63/63e93eed1aa9defb946a32fc19fbada5.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"size","attrs":{"size":9}}],"text":"*设计流程图","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"疑难点","attrs":{}}]},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"DB选型(mysql/mongo)","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"underline","attrs":{}}],"text":"业务场景","attrs":{}},{"type":"text","text":":","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"要保证一个请求在响应后,之后每次返回结果都一样,需要保存response数据,当同一个请求进行重复请求时,直接查DB返回结果即可,所以需要保存response结果。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"相同点不做赘述,主要说下对我们来说,两者之间对我们业务影响最大的区别:","attrs":{}}]},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/63/637aef1256fb848cbccbbe48c05f3286.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"选择","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"underline","attrs":{}}],"text":"业务特点","attrs":{}},{"type":"text","tex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