July 2003
Beginner
256 pages
6h 28m
English
Content preview from Learning UMLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Packages and Subsystems
As a model may have hundreds (if not thousands) of model elements, how do you organize the elements that make up a system and their relationships? And how do you use this information to determine how best to develop the system while considering technical trade-offs concerning the system, including which elements may be developed in parallel, which elements may be purchased rather than built, and which elements may be reused? Packages and subsystems, called model management elements, address these questions.
Packages
A package is a grouping and organizing element in which other elements reside, which must be uniquely named. In the UML, packages are used in a manner similar to the way directories and folders in an operating system group and organize files. For example, the project management system may be decomposed into a collection of classes organized into packages as follows:
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Utility Date, time, and other utility classes
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Workers The
Workerclass and any other worker-related classes in which theWorkerclass is contained inside of a package namedGeneric-
Generic Generic classes such as the
Workerclass and any other worker-related classes-
Work Units The
UnitOfWorkclass and any other work-related classes-
Work Products The
WorkProductclass and any other work product-related classes-
User Interface A package housing classes responsible for providing a user interface through which users may interact with the system
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Business Processing A package housing ...
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