如何在 UML 中将类标记为单例?

问题描述

我有一个 UML 图，我想在上面将一些类标记为单例(因为它们是).我怎么做?我是要发明一种新的刻板印象，还是只是添加评论，或者是否有一些现有的方法可以做到这一点?

解决方案

Craig Larman 的应用 UML 和模式"一书(第 3 版)给出了序列图的以下符号:

请注意，这意味着在调用 doA 之前，:Register 对象设法通过标准方式访问单例，例如，getInstance().这使图表更加灵活.

对于类图:

I have an UML diagram on which I want to mark some classes as singletons (because they are). How do I do that? Do I invent a new stereotype or do I just add a comment or are there some existing means to do that?

解决方案

Craig Larman's "Applying UML and Patterns" book (3rd edition) gives the following notation for a sequence diagram:

Note that it implies that before calling doA the :Register object manages to get access to the singleton via the standard way, e.g., getInstance(). This makes the diagram more agile.

For a class diagram:

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