The Specification Pattern

I recently stumbled across an older article from Greg Young about something called the Specification Pattern. I haven’t heard about it before but the problem sounds familiar to me as I already implemented something similar.

Digging deeper I found an interesting paper from Eric Evans and Martin Fowler explaining the idea in depth: Specifications.

There is also a small Java implementation of the pattern available at Google Code that unforunately seems to be inactive since 2008.

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