GRASP (object-oriented design): Difference between revisions

Revision as of 06:21, 14 July 2020

Revision as of 18:51, 19 July 2020

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'''General Responsibility Assignment Software Patterns''' (or '''Principles'''), abbreviated '''GRASP''', consist of guidelines for assigning responsibility to classes and objects in [[object-oriented design]].<ref>https://dzone.com/articles/solid-grasp-and-other-basic-principles-of-object-o</ref> It is not related to the [[SOLID]] design principle.

The different patterns and principles used in GRASP are controller, creator, indirection, information expert, low [[coupling (computer science)|coupling]], high [[cohesion (computer science)|cohesion]], [[Polymorphism (object-oriented programming)|polymorphism]], protected variations, and pure fabrication. All these patterns answer some [[software]] problems, and these problems are common to almost every [[software development]] project. These techniques have not been invented to create new ways of working, but to better document and standardize old, tried-and-tested [[Computer programming|programming]] principles in object-oriented design.

Computer scientist [[Craig Larman]] states that "the critical design tool for software development is a mind well educated in design principles. It is not [[Unified Modeling Language|UML]] or any other technology."{{sfn|Larman|2005|p = 272}} Thus, GRASP are really a mental toolset, a learning aid to help in the design of object-oriented software.

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== Patterns ==

In OO design, a pattern is a named description of a problem and solution that can be applied in new contexts; ideally, a pattern advises us on how to apply its solution in varying circumstances and considers the forces and trade-offs. Many patterns, given a specific category of problem, guide the assignment of responsibilities to objects.

===Information expert===

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* Instances of <code>B</code> closely use instances of <code>A</code>

* Instances of <code>B</code> have the initializing information for instances of <code>A</code> and pass it on creation.<ref>{{Harvnb|Larman|2005}} chapter 16, section 16.7</ref>

'''Related Pattern or Principle''': Low Coupling, [[Factory pattern]]