MethodCache

MethodCache lets you easily cache the results of any instance method or class method in Ruby.

Usage:

class Foo
  extend Ifttt::MethodCache

  cache_method :bar
  def bar
    # do expensive calculation
  end

  cache_class_method :baz, :clone => true, :expiry => 1.day
  def self.baz
    # do some expensive calculation that will be invalid tomorrow
  end
end

foo = Foo.new
foo.bar # does calculation
foo.bar # cached

Foo.baz # does calculation
Foo.baz # cached

Foo.invalidate_cached_method(:baz)

Foo.baz # does calculation
Foo.baz # cached

Install:

gem install method_cache

About this fork:

Forked for ifttt

About instances

*This is important, please make sure you understand it*

By default this method will qualify the key based on an instance hash.

That is, by default, every instance will cache to a different key, even given the same arguments. (This makes sense, technically all the instance variables of an object are arguments and thus the output could be different.)

If you want all instance to share a cache for a given set of arguments, first, consider making this a class method and calling that. Second, if you absolutely have to have it be an instance method, define #string_hash on your method and, if that method is consistent, all the instances will share a hash key for a given set of arguments.

License:

Copyright © 2010 Justin Balthrop, Geni.com; Published under The MIT License, see LICENSE