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17 lines
592 B
Markdown
17 lines
592 B
Markdown
# Singleton
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**THIS IS CONSIDERED TO BE AN ANTI-PATTERN! FOR BETTER TESTABILITY AND MAINTAINABILITY USE DEPENDENCY INJECTION!**
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## Purpose
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To have only one instance of this object in the application that will handle all calls.
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## Examples
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* DB Connector
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* Logger (may also be a Multiton if there are many log files for several purposes)
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* Lock file for the application (there is only one in the filesystem ...)
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## Diagram
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<img src="http://yuml.me/diagram/scruffy/class/[Singleton|-instance: Singleton|+getInstance(): Singleton;-__construct(): void;-__clone(): void;-__wakeup(): void]" > |