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Allan MacGregor:
Design Patterns in PHP Singletons
January 29, 2014 @ 09:25:55

Allan MacGregor has posted his latest in his look at design patterns in PHP with this most recent post about the Singleton pattern.

The singleton pattern is used to restrict the instantiation of a class to a single object, which can be useful when only one object is required across the system. Singletons are designed to ensure there is a single (hence the name singleton) class instance and that is global point of access for it, along with this single instance we have global access and lazy initialization.

He provides a basic Singleton implementation in PHP, a "User" class that always returns the same instance of itself no matter how many times the "singleton" method is called. He continues on and touches on one of the pain points around singleton use - many developers consider them an anti-pattern because their results can make it difficult to correctly test. He talks about how they break the Single Responsibility Principle (part of SOLID) and how they can hide dependency injection.

Singletons, Anti-patterns, and patterns in general are not good or bad; what makes a Singleton an Anti-pattern is not the pattern itself but how often is poorly implemented and how easy it is to do so.
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design pattern singleton introduction antipattern testing


Lars Strojny's Blog:
Antipattern the verbose constructor
July 31, 2008 @ 10:29:14

In this new post from Lars Strojny, there's a discussion of an "antipattern" - using the constructor for more than it was intended, the "verbose constructor".

Constructors are often used to shortcut dependency injection and parameter passing on instantiation. This is a valid practice and often leads to shorter code. [...] Instead of creating a new instance of "Money" and calling three setter, everything can be done compactly in the constructor. [...] So for the money object this works pretty well. The code is easy to read, but wait, the first argument can be grasped easily, the second too, but the third? It is not too obvious that it is a divisor is passed.

He compares three different ways to get the data into the class - the already-mentioned parameters in the constructor, passing an array into the constructor and using full getters/setters to push the data into the right places (with fluent interfaces even!).

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antipattern verbose constructor array getter setter

Michael Kimsal's Blog:
New antipattern? "Multi Master Data"
June 29, 2006 @ 07:00:35

If you've been programming for any length of time, you know the "joy" of working with someone else's code. When taking over a project, the first inclination I've seen with most programmers is to go in and format everything to what they'd like (or duplicate functionality). This is where the problem comes in, the trend that Michael Kimsal talks about in his new blog post - something he wonders about being an "antipattern".

I was discussing things with my brother the other day and I came up with a problem which he helped name. I'm currently maintaining some code, and it's quite a jumble. One of the things I can tell is that one of my predecessors began adding new sections of code to clean up the logic in other areas of the code. However, what never happened was the clean up of the old code, so now there's two places where the same set of data is retrieved in different ways.

He proposes the name "Multi Master Data" for the situation - two different sources, living in the same code, doing the same thing. Of course, he also mentions a situation where this type of problem can cause real issues, especially when trying to track down a bug (a bang your head on the desk moment).

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multi master datr antipattern clean multi master datr antipattern clean

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