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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.
Observer pattern is not the same thing as Publish/Subscribe. Gang of Four is the canonical reference. --Merarischroeder 02:18, 24 January 2021 (UTC) If GoF is the canonical reference, they describe Publish/Subscribe as an alias for Observer. 64.234.88.136 15:41, 17 May 2022 (UTC)
Design Patterns: Elements of Reusable Object-Oriented Software (1994) is a software engineering book describing software design patterns. The book was written by Erich Gamma , Richard Helm , Ralph Johnson , and John Vlissides , with a foreword by Grady Booch .
Listener Pattern Architecture. The Listener Pattern is typically known as Observer Pattern. It is a Behavioral Pattern (aka Publish-Subscribe), which deals with dynamic changes in the state of different objects. Listener Pattern follows a structure where an event listener is registered to event source.
The indirection pattern supports low coupling and reuses potential between two elements by assigning the responsibility of mediation between them to an intermediate object. An example of this is the introduction of a controller component for mediation between data (model) and its representation (view) in the model-view-controller pattern.
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The Interpreter [2] design pattern is one of the twenty-three well-known GoF design patterns that describe how to solve recurring design problems to design flexible and reusable object-oriented software, that is, objects that are easier to implement, change, test, and reuse.
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