What is the Observer Design Pattern?
The Observer Design Pattern is a behavioral design pattern that defines a one-to-many dependency between objects so that when one object (the subject) changes state, all its dependents (observers) are notified and updated automatically.
It primarily deals with the interaction and communication between objects, specifically focusing on how objects behave in response to changes in the state of other objects.
- The pattern is concerned with defining a mechanism for a group of objects to interact based on changes in the state of one object (the subject). The observers’ behavior is triggered by changes in the subject’s state.
- It encapsulates the behavior of the dependent objects (observers) and allows for a clean separation between the subject and its observers. This separation promotes a more modular and maintainable design.
- The pattern promotes loose coupling between the subject and its observers. The subject doesn’t need to know the concrete classes of its observers, and observers can be added or removed without affecting the subject.
- The primary mechanism in the Observer Pattern is the notification of observers when a change occurs. This notification mechanism facilitates the dynamic and coordinated behavior of multiple objects in response to changes in the subject.
Observer Design Pattern
The Observer Design Pattern is a behavioral design pattern that defines a one-to-many dependency between objects so that when one object (the subject) changes state, all its dependents (observers) are notified and updated automatically.
Important Topics for the Observer Design Pattern
- What is the Observer Design Pattern?
- Real-world analogy of the Observer Design Pattern
- Components of Observer Design Pattern
- Observer Design Pattern example
- When to use the Observer Design Pattern?
- When not to use the Observer Design Pattern?