Pakiderm

Allows you to unobtrusively memoize simple methods.

Usage

class Counter
  extend Pakiderm

  memoize \
  def increment
    @sum = 1 + @sum.to_i
  end
end

Your method will only be called the first time, the result will be stored and returned on subsequent invocations.

counter = Counter.new
=> Counter

counter.increment
=> 1

counter.increment
=> 1

You can also pass a list of methods that should be memoized:

memoize :complex_calculation, :api_response, :db_query

Background

Pakiderm adds a method by using Module#prepend in order to"intercept" calls to the original method and provide memoization.

Caveat

If you override the method in a subclass, Pakiderm's method won't be able to intercept calls to the subclass' method.

License

Copyright (c) 2014 Máximo Mussini

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.