July 2001
Intermediate to advanced
656 pages
15h 51m
English
book
Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
by Craig Larman
Content preview from Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
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28.1. New System Sequence Diagrams
In the current iteration, the new payment handling requirements involve new collaborations with external systems. To review, SSDs use sequence diagram notation to illustrate inter-system collaborations, treating each system as a black-box. It is useful to illustrate the new system events in SSDs in order to clarify:
new system operations that the NextGen POS system will need to support
calls to other systems, and the responses to expect from these calls
Common Beginning of Process Sale Scenario
The SSD for the beginning portion of a basic scenario includes makeNewSale, enterItem and endSale system events; it is common regardless of the payment method (see Figure 28.1).
Figure 28.1. SSD common beginning.
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