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DesignPatternsPHP/Creational/Singleton/README.md
John Webb 1dabe3c6ed Added Behavioral pattern UMLs
2014-07-31 14:47:55 -05:00

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Singleton

THIS IS CONSIDERED TO BE AN ANTI-PATTERN! FOR BETTER TESTABILITY AND MAINTAINABILITY USE DEPENDENCY INJECTION!

Purpose

To have only one instance of this object in the application that will handle all calls.

Examples

  • DB Connector
  • Logger (may also be a Multiton if there are many log files for several purposes)
  • Lock file for the application (there is only one in the filesystem ...)

UML Diagram

Alt Singleton UML Diagram