3.05_The ''extend'' Dependency
rmb1905・4 minutes read
The extended dependency relationship between use cases allows an optional connection where an extending use case, like printing a receipt, enhances a base use case such as purchasing gas with a credit card without being essential to its completion. Identifying an extension point is crucial for integrating the extending use case effectively, while it is recommended to use such extensions sparingly to maintain clarity in diagrams, as they are secondary to the primary functionality of the base use case.
Insights
- The extended dependency relationship between use cases allows for optional enhancements to a base use case, where an extending use case, like "print receipt," adds extra steps without being essential to the main process, such as "purchase gas with credit card." This relationship is visually represented in diagrams with the extending use case positioned below the base use case, indicating its secondary nature.
- Identifying an extension point is crucial when integrating an extending use case, as it shows where the additional steps fit within the base use case's sequence, such as after charging the account for gas. While these extensions can enhance functionality, they should be used judiciously to prevent diagram clutter, maintaining the focus on the primary actions of the base use case.
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Understanding Extended Use Case Relationships
- The extended dependency relationship between use cases indicates an optional connection where the extending use case enhances the base use case by adding additional steps. In this relationship, the base use case, such as "purchase gas with credit card," contains a series of steps, and at a certain point, an option arises to include the extending use case, like "print receipt," which is not necessary for the completion of the base use case. The dependency arrow points from the extending use case to the base use case, and it is conventional to position the extending use case below the base use case in diagrams.
- When incorporating an extending use case, it is important to identify an extension point, which indicates where the extending use case fits into the base use case's steps, such as after the account is charged for the gas purchase. The extending use case can occur either synchronously or asynchronously with the base use case. While using extension use cases can provide additional functionality, they should be used sparingly to avoid cluttering diagrams, and they are typically considered secondary to the main functionality of the base use case, which in this example is charging the gas purchase to a credit card.
