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gptkbp:instanceOf
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Design pattern
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gptkbp:alternativeTo
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Dependency injection
Service locator
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gptkbp:category
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Creational pattern
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gptkbp:criticizedFor
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Difficult unit testing
Global state
Hidden dependencies
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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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Logger
Configuration manager
Database connection pool
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gptkbp:guarantees
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A class has only one instance
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https://www.w3.org/2000/01/rdf-schema#label
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Singleton
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gptkbp:implementedIn
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Double-checked locking
Eager initialization
Lazy initialization
Static block initialization
|
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gptkbp:pattern
|
Creational
|
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gptkbp:popularizedBy
|
gptkb:Gang_of_Four
|
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gptkbp:problemAddressed
|
Controlling object creation
Limiting number of instances
|
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gptkbp:provides
|
A global point of access to the instance
|
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gptkbp:threadSafe
|
Can be an issue in multithreaded environments
|
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gptkbp:usedIn
|
gptkb:Java
gptkb:Objective-C
gptkb:Python
gptkb:Swift
gptkb:C#
gptkb:C++
PHP
Software engineering
|
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gptkbp:bfsParent
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gptkb:Bayleaf_Farmhouse
gptkb:Winkhurst_Tudor_Kitchen
gptkb:Diocese_of_Maitland-Newcastle
gptkb:Arundel_and_South_Downs
gptkb:Chichester_District
gptkb:Winston_County,_Mississippi
gptkb:Richard_Singleton
gptkb:Wollemi_National_Park
gptkb:Hunter_Valley
gptkb:Dungog_Shire
gptkb:NSW_TrainLink_coach_services
gptkb:Upper_Hunter
gptkb:Hunter_River
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gptkbp:bfsLayer
|
6
|