我有这样的用例。
这是一个紧急监控用例和参与者,哪一个是外部系统参与者?我刚刚学习了用例图,我想答案是监控操作员,但我把另一个参与者搞混了,特别是监控传感器和远程系统?另一个参与者也是外部系统参与者吗?但选择只是: a.远程系统b.监控操作员c.监控传感器d.生成警报你能给出一个链接,这样我就能读懂它,也能证明我的答案是正确的/错误的。
发布于 2020-10-11 05:27:14
actor始终位于系统外部。外部系统执行元是非人类执行元。
在您的图表中,Monitoring operator
似乎是一个安全代理,它看着屏幕并对正在发生的事情做出反应。
Remote service
似乎是一个与某些用例交互的非人类参与者,可能是为了自动向系统提供数据:
Remote System
和Monitoring sensor
到Remote service
的箭头需要是一个generalization箭头(通常是一个大的白色三角形。用例不允许在它们之间关联参与者)。这意味着两者都是Remote service
.的特殊形式
- However, `Remote service` seems meant here more as a placeholder for its specializations. You could therefore as well omit it.
- If the sensor interacts with a system as an actor, it should be complex enough to be autonomous. This means that it's not a passive sensor but could be conisdered as a small active system. I would name it as well.
- And of course, the `Remote system` is without a doubt an external system actor.
https://stackoverflow.com/questions/64298221
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