【箭头指向】:无箭头,将参与者与用例相连接,指向消息接收方 b. 泛化(Inheritance) 就是通常理解的继承关系,子用例和父用例相似,但表现出更特别的行为;子用例将继承父用例的所有结构、行为和关系。子用例可以使用父用例的一段行为,也可以重载它。父用例通常是抽象的。在实际应用中很少使用泛化关系,子用例中的特殊行...
用例(Use Case): 即系统具有的功能,在用例图中用椭圆圈表示,圈里用文字描述该用例,一般为动宾短语。 系统(System): 用来展示系统的一部分功能,这部分功能联系紧密。 关系(Relationship): 关联(Association): 表示参与者/执行者与用例之间的通信,任何一方都可发送或接受消息。 泛化(Inheritance): 子用例和父用例关...
对Inheritance而言,子用例包含基础用例的所有内容及其和其他用例或参与者之间的关系; ●泛化侧重表示子用例间的互斥性; ●包含侧重表示被包含用例对Actor提供服务的间接性; ●扩展侧重表示扩展用例的触发不定性; 另外一点需要提及的是:泛化中的子用例和扩展中的扩展用例均可以作为基本用例事件的备选择流而存在。 三、...
Arrange the use cases in logical order so that the readability of the diagram is enhanced. Like actors, use cases can also use inheritance. However, the inheriting use case must be placed below the parent use case to improve clarity. ...
Reuse in Use Case Diagrams Figure 4shows the three types of relationships between use cases — extends, includes, and inheritance — as well as inheritance between actors. I like to think of extend relationships as the equivalent of a “hardware interrupt” because you don’t know when or if...
高通camx Usecase classes and inheritance 详解(五) AdvancedCameraUsecase。 如下图: AdvancedCameraUsecase 是最常用的usecase。下面将通过流程图描述调用的流程和在流程中调用的函数的详细信息来解释usecase中的一...类CameraUsecaseBase、UsecaseDefault、UsecaseDualCamera、UsecaseQuadCFA、UsecaseTorch和 ...
Place an Inheriting Use Case Below The Base Use Case Apply the “Is Like” Rule to Actor Inheritance Place an Inheriting Actor Below the Parent Actor 4. System Boundary Boxes The rectangle around the use cases is called the system boundary box and as the name suggests it indicates the scop...
The extended use case is at the arrowhead end. Notice that the diagram does not show the exact circumstances under which the extension applies: you can record these in a comment or other document. 7 Inheritance Relates a specialized and a generalized element. The generalized element is at the...
In such case a Child use-case inherits the properties and behavior of the parent use. Hence we need to generalize the actor to show the inheritance of functions. They are represented by a solid line with a large hollow triangle arrowhead.Association between Use-Cases...
communication lines between actors and use cases, (include, extend, and inheritance) arrows between use cases. These are detailed in the rest of this document. (Note there is no mention here about Test cases, or packages.) A use case diagram can represent different things depending on the le...