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Behavioral/ChainOfResponsibilities/index.rst

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+Chain Of Responsibilities
+=========================
+
+Purpose:
+--------
+
+To build a chain of objects to handle a call in sequential order. If one
+object cannot handle a call, it delegates the call to the next in the
+chain and so forth.
+
+Examples:
+---------
+
+-  logging framework, where each chain element decides autonomously what
+   to do with a log message
+-  a Spam filter
+-  Caching: first object is an instance of e.g. a Memcached Interface,
+   if that "misses" it delegates the call to the database interface
+-  Yii Framework: CFilterChain is a chain of controller action filters.
+   the executing point is passed from one filter to the next along the
+   chain, and only if all filters say "yes", the action can be invoked
+   at last.
+
+UML Diagram
+-----------
+
+.. image:: uml/uml.png
+   :alt: Alt ChainOfResponsibility UML Diagram
+   :align: center
+
+Code
+----
+
+You can also find these code on `GitHub`_
+
+Handler.php
+
+.. literalinclude:: Handler.php
+   :language: php
+   :linenos:
+
+Request.php
+
+.. literalinclude:: Request.php
+   :language: php
+   :linenos:
+
+Test
+----
+
+Tests/ChainTest.php
+
+.. literalinclude:: Tests/ChainTest.php
+   :language: php
+   :linenos:
+
+.. _`GitHub`: https://github.com/domnikl/DesignPatternsPHP/tree/master/Behavioral/ChainOfResponsibilities