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
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31.1. Package Organization Guidelines
Guideline: Package Functionally Cohesive Vertical and Horizontal Slices
The basic “intuitive” principle is modularization based on functional cohesion—types are grouped together that are strongly related in terms of their participation in a common purpose, service, collaborations, policy, and function. For example, all the types in the NextGen Pricing package are related to product pricing. The layers and packages in the NextGen design are organized by functional groups.
In addition to the usually sufficient informal guesswork on grouping by function (“I think class SalesLineItem belongs in Sales”) another clue to functional grouping is a cluster of types with strong internal coupling and weaker extra-cluster ...
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