UML 用例：如何对“批量”建模进行建模特征？
是否应该将批量计划流程（例如，夜间流程）建模为用例？这是系统应该做的事情，但是没有一个 Actor “使用”该功能，因为它是预定的。
有什么建议吗？ 谢谢！
Should a batch scheduled process (for example, a nightly process) be modeled as a Use Case? it is something the system should do, but there is not an Actor "using" the feature, because it is scheduled.
Any suggestions?
Thanks!
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我们定义了一个“调度程序”参与者来模拟该场景。调度程序通常有自己的一组用例，这些用例是批处理作业，或者需要定期运行的可执行文件等。例如，用例可以写成“用例在当前时间整点时开始”每天运行 24 次的作业。我们尽量不包含太多这样的案例，因为很容易陷入实现细节之中。我们等到真正重要的活动必须安排时间时才进行，例如会计部门的每月结算程序。他们没有提及任何软件细节（例如调度软件的名称），只是指出用例是由调度程序参与者在给定的日期和/或时间触发的。
We've defined a 'Scheduler' actor to model that scenario. The Scheduler usually has its own set of use cases which are batch jobs, or executables that need to run regularly, etc. For example, the Use Case can be written like "The Use Case begins when the current time is on the hour" for a job that runs 24 times a day. We try not to include too many of these cases because it is too easy to get bogged down into implementation details. We wait until really important activities have to be timed, like monthly close procedures for the accounting department. They don't mention any software specifics (like the name of the scheduling software), just that the Use Case is triggered by the Scheduler actor on a given day and/or time.
第一次尝试：
但正如你所说，作为主要演员这很奇怪。
您可以考虑人类的替代方案。
所以问问自己：
第二次尝试：
有一个很好的IBM 站点上的文章 亲爱的博士用例：时钟是演员吗？
您可以在 TIME 是用例中的参与者吗？
First attempt:
But as you said it is strange as an primary actor.
You can think a human alternative.
So ask yourself:
Second Attempt:
There is a good article at IBM site Dear Dr. Use Case: Is the Clock an Actor?
And you can check similiar question at Is TIME an actor in a use case?
系统（操作系统）是“参与者”：
http://en.wikipedia.org/ wiki/Actor_%28UML%29
在UML中，“Actor”不仅仅是一个人，可以是一个进程或操作系统，您只需添加一个构造型，表明它的“系统”。
The system (O.S.) its the "actor":
http://en.wikipedia.org/wiki/Actor_%28UML%29
In U.M.L, an "Actor" is not just a person, can be a process or the O.S., you just add an stereotype, indicating its "system".