emacsway-log: Software Design, Clean Architecture, DDD, Microservice Architecture, Distributed Systems, XP, Agile, etc.

emacsway-log: Software Design, Clean Architecture, DDD, Microservice Architecture, Distributed Systems, XP, Agile, etc.

Обратимся к первоисточнику термина "сокрытие информации" - к статье "On the Criteria to Be Used in Decomposing Systems Into Modules." by David Parnas: 💬 Information-hiding objects can be created in any language; my first experiments used primitive versions…

Ну и формальное определение абстракции:

💬 Abstraction is one of the fundamental ways that we as humans cope with complexity. Dahl, Dijkstra, and Hoare suggest that “abstraction arises from a recognition of similarities between certain objects, situations, or processes in the real world, and the decision to concentrate upon these similarities and to ignore for the time being the differences” [42]. Shaw defines an abstraction as “a simplified description, or specification, of a system that emphasizes some of the system’s details or properties while suppressing others. A good abstraction is one that emphasizes details that are significant to the reader or user and suppresses details that are, at least for the moment, immaterial or diversionary” [43]. Berzins, Gray, and Naumann recommend that “a concept qualifies as an abstraction only if it can be described, understood, and analyzed independently of the mechanism that will eventually be used to realize it” [44]. Combining these different viewpoints, we define an abstraction as follows:

An abstraction denotes the essential characteristics of an object that distinguish it from all other kinds of objects and thus provide crisply defined conceptual boundaries, relative to the perspective of the viewer.

An abstraction focuses on the outside view of an object and so serves to separate an object’s essential behavior from its implementation. Abelson and Sussman call this behavior/implementation division an abstraction barrier [45] achieved by applying the principle of least commitment, through which the interface of an object provides its essential behavior, and nothing more [46]. We like to use an additional principle that we call the principle of least astonishment, through which an abstraction captures the entire behavior of some object, no more and no less, and offers no surprises or side effects that go beyond the scope of the abstraction.

-- "Object-Oriented Analysis and Design with Applications" 3rd edition by Grady Booch, Robert A. Maksimchuk, Michael W. Engle, Bobbi J. Young Ph.D., Jim Conallen, Kelli A. Houston

www.tgoop.com/emacsway_log/1408

1.67K viewsIvan, May 26, 2024 at 17:18

Ну и формальное определение абстракции:

💬 Abstraction is one of the fundamental ways that we as humans cope with complexity. Dahl, Dijkstra, and Hoare suggest that “abstraction arises from a recognition of similarities between certain objects, situations, or processes in the real world, and the decision to concentrate upon these similarities and to ignore for the time being the differences” [42]. Shaw defines an abstraction as “a simplified description, or specification, of a system that emphasizes some of the system’s details or properties while suppressing others. A good abstraction is one that emphasizes details that are significant to the reader or user and suppresses details that are, at least for the moment, immaterial or diversionary” [43]. Berzins, Gray, and Naumann recommend that “a concept qualifies as an abstraction only if it can be described, understood, and analyzed independently of the mechanism that will eventually be used to realize it” [44]. Combining these different viewpoints, we define an abstraction as follows:

An abstraction denotes the essential characteristics of an object that distinguish it from all other kinds of objects and thus provide crisply defined conceptual boundaries, relative to the perspective of the viewer.

An abstraction focuses on the outside view of an object and so serves to separate an object’s essential behavior from its implementation. Abelson and Sussman call this behavior/implementation division an abstraction barrier [45] achieved by applying the principle of least commitment, through which the interface of an object provides its essential behavior, and nothing more [46]. We like to use an additional principle that we call the principle of least astonishment, through which an abstraction captures the entire behavior of some object, no more and no less, and offers no surprises or side effects that go beyond the scope of the abstraction.

-- "Object-Oriented Analysis and Design with Applications" 3rd edition by Grady Booch, Robert A. Maksimchuk, Michael W. Engle, Bobbi J. Young Ph.D., Jim Conallen, Kelli A. Houston

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