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gptkbp:instanceOf
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Software Design Pattern
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gptkbp:advantage
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Potential Memory Leaks
Unexpected Updates
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gptkbp:alsoKnownAs
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gptkb:Publish-Subscribe_Pattern
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gptkbp:author
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gptkb:Erich_Gamma
gptkb:John_Vlissides
gptkb:Richard_Helm
gptkb:Ralph_Johnson
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gptkbp:benefit
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gptkb:Loose_Coupling
Dynamic Relationships
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gptkbp:category
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Behavioral Pattern
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gptkbp:commonIn
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gptkb:Model-View-Controller_(MVC)
Event Handling Systems
GUI Toolkits
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gptkbp:component
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Observer
Subject
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gptkbp:describedBy
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gptkb:Design_Patterns:_Elements_of_Reusable_Object-Oriented_Software
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gptkbp:example
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C# IObserver Interface
Java java.util.Observer
JavaScript Event Listeners
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https://www.w3.org/2000/01/rdf-schema#label
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Observer Pattern
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gptkbp:purpose
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Define a one-to-many dependency between objects
Notify dependents automatically of state changes
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gptkbp:relatedTo
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gptkb:Publish-Subscribe_Pattern
Event Bus Pattern
Mediator Pattern
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gptkbp:usedIn
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Object-Oriented Programming
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gptkbp:bfsParent
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gptkb:Design_Pattern
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gptkbp:bfsLayer
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5
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