Clara Rules

• http://www.clara-rules.org/
• Rules-Engine
• written_in: clojure
• related: Pathom

Features

• Easily used from Java
  • "In Java, our facts would typically be JavaBeans."
• Simple but expressive
• combine the best ideas from expert systems, functional programming, and the best known develpment practices.

Approach

• http://www.clara-rules.org/docs/approach/
  • expressiveness: We didn’t want to fall into the trap of most rule engines, which used a limited host language that blocked easy expression or invocation of rich logic. Limited languages are great for limited problems, but they can become an obstacle as problems evolve.
  • Lisp-style macros are what makes Clara possible. At its core, Clara is a collection of macros that takes a set of independent rules, identifies and merges commonality, and compiles those rules into an efficient executable structure.

Clojure for games

• "There are also experiments with trying to make rule systems like Clara fast enough to use in games."
• "Alex Kehayias gave a talk about designing a functional game engine in ClojureScript, using components, here: https://www.youtube.com/watch?v=TW1ie0pIO_E I thought it was a superb talk. "
• Ittyon

References

• Entity–component–system and Clojure

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Backlinks

• Fulcro