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A micro inference engine
Ruby
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lib
perf_test
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README.rdoc
micro_inferer.gemspec

README.rdoc

Micro Inferer

by Aish Fenton

Description

A micro inference engine.

Declare your rules:

inferer = Micro::Inferer.new
inferer.when(:wet).it_is(:raining)
inferer.when(:raining).and(:cold).it_is(:winter)

State the facts:

inferer.it_is(:wet)
inferer.it_is(:cold)

Infer stuff with it:

inferer.infer
> :winter

Why use an inference engine?

You may want to consider using a rules engine when:

  • Your rules have dependancies between them. In other words rule a is true only if b is true also

  • You have a large number of rules

  • The data your rules use changes infrequently

  • You need to run your rules frequently to see if they've fired

  • You want declarative (and pretty) syntax for expressing your rules

Performance

Performance is O© where c is the number facts that have changed. This is the main difference between a rules engine and a collection of IF-THEN-ELSE statements. IF-THEN-ELSE statements have performance O(rc) where r is the number of rules.

Micro::Inferer's performance is independant of the number of rules in the system

Install

sudo gem install visfleet-micro_inferer

Licence

(The MIT License)

Copyright © 2008 FIX

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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