Singleton
E679867
Singleton is a creational design pattern in software engineering that ensures a class has only one instance while providing a global point of access to it.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Singleton canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7665221 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Singleton Context triple: [Prototype, relatedTo, Singleton]
-
A.
Singleton
Singleton is a town in the Hunter Region of New South Wales, Australia, known for its coal mining, agriculture, and proximity to the Hunter Valley wine region.
-
B.
Singleton
Singleton is the middle name of John S. Mosby, the famed Confederate cavalry commander and guerrilla leader known as the "Gray Ghost" during the American Civil War.
-
C.
Singur
Singur is a town in West Bengal, India, known nationally for its role in a major land acquisition and industrialization controversy involving the proposed Tata Nano car factory.
-
D.
Mono
Mono is a Native American language of the Numic branch of the Uto-Aztecan language family, traditionally spoken in parts of California.
-
E.
Mono
Mono is an open-source, cross-platform implementation of Microsoft's .NET framework that enables running .NET applications on multiple operating systems.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Singleton Target entity description: Singleton is a creational design pattern in software engineering that ensures a class has only one instance while providing a global point of access to it.
-
A.
Singleton
Singleton is a town in the Hunter Region of New South Wales, Australia, known for its coal mining, agriculture, and proximity to the Hunter Valley wine region.
-
B.
Singleton
Singleton is the middle name of John S. Mosby, the famed Confederate cavalry commander and guerrilla leader known as the "Gray Ghost" during the American Civil War.
-
C.
Singur
Singur is a town in West Bengal, India, known nationally for its role in a major land acquisition and industrialization controversy involving the proposed Tata Nano car factory.
-
D.
Mono
Mono is a Native American language of the Numic branch of the Uto-Aztecan language family, traditionally spoken in parts of California.
-
E.
Mono
Mono is an open-source, cross-platform implementation of Microsoft's .NET framework that enables running .NET applications on multiple operating systems.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
creational design pattern
ⓘ
software design pattern ⓘ |
| advantage |
centralized management of global state
ⓘ
controlled access to a single instance ⓘ reduced memory usage for shared services ⓘ |
| appearsIn | Gang of Four design patterns catalog NERFINISHED ⓘ |
| canBeImplementedIn |
C#
ⓘ
C++ NERFINISHED ⓘ Java NERFINISHED ⓘ JavaScript NERFINISHED ⓘ Python NERFINISHED ⓘ many object-oriented languages ⓘ |
| canBeMadeThreadSafeBy |
double-checked locking
ⓘ
initialization-on-demand holder idiom ⓘ synchronizing the accessor method ⓘ using language-level static initialization ⓘ |
| category | object creational pattern ⓘ |
| commonUseCase |
caching manager
ⓘ
configuration manager ⓘ connection pool manager ⓘ logging service ⓘ window or application controller ⓘ |
| criticizedFor |
encouraging global state
ⓘ
hindering testability ⓘ tight coupling ⓘ |
| describedIn | Design Patterns: Elements of Reusable Object-Oriented Software NERFINISHED ⓘ |
| disadvantage |
difficulty in unit testing
ⓘ
hidden dependencies ⓘ potential concurrency issues ⓘ potential for global state misuse ⓘ |
| ensures | a class has only one instance ⓘ |
| field | software engineering ⓘ |
| hasKeyFeature |
lazy or eager initialization of the instance
ⓘ
restricted constructor access ⓘ single globally accessible instance ⓘ static access method ⓘ |
| provides | a global point of access to that instance ⓘ |
| relatedTo |
Abstract Factory pattern
NERFINISHED
ⓘ
Dependency Injection NERFINISHED ⓘ Factory Method pattern NERFINISHED ⓘ Service Locator pattern NERFINISHED ⓘ |
| supports |
eager initialization
ⓘ
lazy initialization ⓘ thread-safe initialization mechanisms ⓘ |
| typicalImplementationDetail |
private constructor
ⓘ
public static accessor method ⓘ static field holding the instance ⓘ |
| usedFor |
controlling object creation
ⓘ
coordinating access to a single service ⓘ managing shared resources ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Singleton Description of subject: Singleton is a creational design pattern in software engineering that ensures a class has only one instance while providing a global point of access to it.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.