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Creational/Singleton/index.rst

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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
+-----------
+
+.. image:: uml/uml.png
+   :alt: Alt Singleton UML Diagram
+   :align: center
+
+Code
+----
+
+You can also find these code on `GitHub`_
+
+Singleton.php
+
+.. literalinclude:: Singleton.php
+   :language: php
+   :linenos:
+
+Test
+----
+
+Tests/SingletonTest.php
+
+.. literalinclude:: Tests/SingletonTest.php
+   :language: php
+   :linenos:
+
+.. _`GitHub`: https://github.com/domnikl/DesignPatternsPHP/tree/master/Creational/Singleton