News Feed
Jobs Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

PHPMaster.com:
Understanding the Observer Pattern
February 23, 2012 @ 11:39:10

PHPMaster.com has a new tutorial looking at another popular design pattern, the Observer pattern, and sharing some example code putting it to use. (Their other design pattern articles include ones on command and factory patterns).

In this article I'll show you how to implement the Observer Pattern. You'll learn how various classes in the pattern relate to one another as subject and observers, how the subject notifies observers of a change in its state, and how to identify scenarios where it would be suitable to use the Observer Pattern in your own code.

The introduce the pattern by using an abstract "Observer" and "Subject" (that defines "attach", "detach", "getState", "setState", "notify" and "getObservers" methods) observer classes to coordinate the attached classes. They extend these classes with "Auth" and "Auth_ForumHook" show how to attach the "Auth_ForumHook" classes to the main "Auth" observer manager and change the state of the observer to notify it of an update.

You can find a more detailed explanation of the Observer pattern on Wikipedia.

0 comments voice your opinion now!
observer design pattern tutorial authorization


blog comments powered by Disqus

Similar Posts

Maarten Balliauw's Blog: Reuse Excel business logic with PHPExcel

The Bakery: 13 New Tutorials and Articles Posted

Pim Elshoff's Blog: Setting up a kickass development environment on Windows

Arnold Daniels' Blog: How I PHP: The Output Handler

DevShed: Factoring Content Boxes with the Factory Pattern in PHP 5


Community Events











Don't see your event here?
Let us know!


symfony2 code install framework introduction unittest application overview component security podcast composer release package hhvm example opinion language hack facebook

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework