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Contents
# = once.rb
#
# == Copyright (c) 2004 Thomas Sawyer
#
# Ruby License
#
# This module is free software. You may use, modify, and/or redistribute this
# software under the same terms as Ruby.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.
#
# == Author(s)
#
# * Thomas Sawyer
# Author:: Erik Veenstra, Thomas Sawyer
# Copyright:: Copyright (c) 2006 Erik Veenstra, Thomas Sawyer
# License:: Ruby License
# = Cache
#
# Cache objects are a kind of "delegator-with-cache".
#
# == Usage
#
# class X
# def initialize ; @tick = 0 ; end
# def tick; @tick + 1; end
# def cached; @cache ||= Cache.new( self ) ; end
# end
#
# x = X.new
# x.tick #=> 1
# x.cached.tick #=> 2
# x.tick #=> 3
# x.cached.tick #=> 2
# x.tick #=> 4
# x.cached.tick #=> 2
#
# You can also use to cache a collections of objects to gain code
# speed ups.
#
# points = points.collect{|point| Cache.cache(point)}
#
# After our algorithm has finished using points, we want to get rid of
# these Cache objects. That's easy:
#
# points = points.collect{|point| point.self }
#
# Or if you prefer (it is ever so slightly safer):
#
# points = points.collect{|point| Cache.uncache(point)}
#
class Cache
private :class, :clone, :display, :type, :method, :to_a, :to_s
def initialize(object)
@self = object
@cache = {}
end
def method_missing(method_name, *args, &block)
# Not thread-safe! Speed is important in caches... ;]
@cache[[method_name, args, block]] ||= @self.__send__(method_name, *args, &block)
end
def self; @self; end
def self.cache(object)
Cache.new(object)
end
def self.uncache(cached_object)
cached_object.self
end
end
Version data entries
9 entries across 9 versions & 1 rubygems