多个登录选项的用例 [英] Use case for multiple login option

问题描述

我有一个用例，用户可以通过正常登录以及社交登录(例如 Twitter、Google、Facebook)登录.我绘制的用例如下，但不确定它是否正确.

I have a use case where user may log in via normal login, as well as social login such as Twitter, Google, Facebook. I draw the use case as below but not sure if it is correct.

登录账号---扩展--->正常登录
---扩展---> Twitter登录
---扩展--->谷歌登录
---扩展---> Facebook登录

Login account ---extends---> normal login
---extends---> Twitter login
---extends---> Google login
---extends---> Facebook login

推荐答案

<> 反之亦然.

一直说这个我很累，但是登录帐户不是一个用例.它不会为演员带来任何价值.这是一个适用于其他真实用例的简单约束.

I'm quite tired telling this all the time, but Login account is not a use case. It does not deliver any value to an actor. It is a simple constraint which applies to other real use cases.

进一步:避免使用<>/<<>.它们是您尝试对用例进行功能分析的标志.相反，用例是综合的，这会产生很大的不同.如果您的用例图开始类似于蜘蛛网，那么您的设计就被破坏了.

Further: avoid the use of <<extends>>/<<include>>. They are a sign of functional analysis you are trying to do with your use cases. Instead use cases are synthesized which makes a big difference. If your use case diagrams start resembling a spider's web your design is broken.

推荐阅读:Bittner/Spence.

Recommended read: Bittner/Spence.

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