News Feed
Sections




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

Mike Lively's Blog:
Why I Hate Singletons
December 29, 2008 @ 12:05:45

Mike Lively has posted a few choice words about one of the most popular and most used design patterns out there - the Singleton.

One of the most derided, yet most loved and used patterns is the singleton pattern. Its supporters continually praise its ability to limit instantiation of objects and its opponents continually chastise its tendency to be little more than a glorified global. While programming in many ways boils down to a matter of preference (you can always find someone that agrees with you,) I thought I might as well document my opinion so that those who don't care can have one more thing to ignore.

He starts by (correctly) defining a Singleton and why, because of that definition, they are evil - they become a "global point of access". Why is that such a bad thing, you ask? Mike By their design they mask dependencies, making it harder to do future development and/or maintenance.

I personally do not see very many viable uses for singletons and I know there are many people that agree with me (google evil singletons). It's simplicity seems appealing, but they are incredibly easy to use in a damaging way. This is the danger you risk with any concept that is easy to understand and easy to abuse.
0 comments voice your opinion now!
singleton evil dependency opinion global access point


blog comments powered by Disqus

Similar Posts

Ralph Schindler's Blog: PHP Component and Library API Design Overview

Community News: Comments on Commenting

Jacob Santos' Blog: Global Functions and How to Not Use Them

Zend Developer Zone: DrupalCon '11 Thoughts (Parts 1 & 2)

Elizabeth Smith's Blog: I guess I'm just ahead of the times...


Community Events





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


install developer community library bugfix code laravel interview configure threedevsandamaybe unittest list release language application series introduction api podcast wordpress

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