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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16.9. High Cohesion
Assign a responsibility so that cohesion remains high.
Solution
How to keep complexity manageable?
Problem
In terms of object design, cohesion (or more specifically, functional cohesion) is a measure of how strongly related and focused the responsibilities of an element are. An element with highly related responsibilities, and which does not do a tremendous amount of work, has high cohesion. These elements include classes, subsystems, and so on.
A class with low cohesion does many unrelated things, or does too much work. Such classes are undesirable; they suffer from the following problems:
hard to comprehend
hard to reuse
hard to maintain
delicate; constantly effected by change
Low cohesion classes often represent a very “large ...
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