Cohesive class
A class whose methods and instance variables collectively serve one closely related primary responsibility.
Software Design for Python Programmers
A cohesive class is a class whose methods and instance variables collectively serve one closely related primary responsibility.
- How it is used
- Separates class responsibilities so operations, maintenance, and cleaning can evolve without one overloaded class.
- How deep it goes
- Defines cohesion and demonstrates responsibility separation through Book/Catalogue and Automobile refactorings, without descending into formal metrics.
- Examples
- Uses Book and Catalogue classes, case-insensitive catalogue searches, and Automobile, Garage, and CarWash refactorings.
- What you can do after
- Evaluate class boundaries and refactor mixed responsibilities into smaller classes with one primary responsibility.
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Object-Oriented Software Design in C++
A class whose members collectively serve one clear primary responsibility.
- How it is used
- Uses single responsibility to guide class design during iterative application development.
- How deep it goes
- Defines cohesion and demonstrates refactoring responsibilities, stopping short of implementation internals.
- Examples
- Uses Book and Catalogue, then contrasts AutomobileApp with Automobile, Garage, and CarWash.
- What you can do after
- Apply the Single Responsibility Principle to split classes with unrelated state and behavior.
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Related concepts
- single responsibility principleimplements · The single responsibility principle is a software design principle that gives a component one focused responsibility and one primary reason to change.
- cohesionmeasured by · Cohesion is the degree to which the elements or responsibilities within a software unit are related and contribute to a coherent purpose.
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