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The observer design pattern is a behavioural pattern listed among the 23 well-known "Gang of Four" design patterns that address recurring design challenges in order to design flexible and reusable object-oriented software, yielding objects that are easier to implement, change, test and reuse. [1]
In the field of sociolinguistics, the term Observer’s Paradox was coined by William Labov, who stated with regard to the term: . The aim of linguistic research in the community must be to find out how people talk when they are not being systematically observed; yet we can only obtain this data by systematic observation.
An 'etic' account is a description of a behavior or belief by a social analyst or scientific observer (a student or scholar of anthropology or sociology, for example), in terms that can be applied across cultures; that is, an etic account attempts to be 'culturally neutral', limiting any ethnocentric, political or cultural bias or alienation by ...
Memento pattern Provides the ability to restore an object to its previous state (rollback) Null object pattern Designed to act as a default value of an object Observer pattern a.k.a. Publish/Subscribe or Event Listener. Objects register to observe an event that may be raised by another object Weak reference pattern De-couple an observer from an ...
The term "design paradigm" is used within the design professions, including architecture, industrial design and engineering design, to indicate an archetypal solution. Thus a Swiss Army Knife is a design paradigm illustrating the concept of a single object that changes configuration to address a number of problems.
The sociology of work, or industrial sociology, examines "the direction and implications of trends in technological change, globalization, labour markets, work organization, managerial practices and employment relations to the extent to which these trends are intimately related to changing patterns of inequality in modern societies and to the ...
A design pattern is the re-usable form of a solution to a design problem. The idea was introduced by the architect Christopher Alexander [ 1 ] and has been adapted for various other disciplines, particularly software engineering .
I have shared the following UML diagrams I have published on Design Patterns Open Online Learning. Your comments are welcomed. A sample UML class and sequence diagram for the Observer design pattern. In the above UML class diagram, the Subject class doesn't update the state of Observer1 and Observer2 directly.