CSC/ECE 517 Fall 2009/wiki3 1 co

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Software Design Anti-Patterns

  Not all patterns are good. Anti-patterns are patterns that initially seem effective, but over time you learn that they lead you into traps. 
      - Scott Klement, Anti-Patterns: Avoid the Programming Dark Side

In this article, we will describe several software design patterns which have been categorized as "anti patterns": Programming approaches which are not uncommon and which can lead to poor program design and performance.

What are Anti-Patterns?

Different texts define the term anti-patterns in different ways:

In each definition, the implementer of the anti-pattern is trying to solve a problem in a common way, however the common way is a bad design that can lead to unintended consequences. Some of the reasons cited in the AntiPatterns book as to why these anti-patterns have been used include: Haste, sloth (or laziness), ignorance, apathy, and pride. Studying anti-patterns can at least help assist the potential anti-pattern implementer in the ignorance category.

Considerations When Writing Anti-Patterns

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Anti-Pattern Examples

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The Blob or God Class

Anti-Pattern Problem

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Refactored Solution

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Example

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Lava Flow

Anti-Pattern Problem

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Refactored Solution

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Example

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Poltergeists

Anti-Pattern Problem

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Refactored Solution

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Example

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Golden Hammer

Anti-Pattern Problem

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Refactored Solution

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Example

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Spaghetti Code

Anti-Pattern Problem

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Refactored Solution

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Example

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Cut-and-Paste Programming

Anti-Pattern Problem

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Refactored Solution

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Example

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Conclusion

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References