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module ActiveSupport
module Memoizable
module Freezable
def self.included(base)
base.class_eval do
unless base.method_defined?(:freeze_without_memoizable)
alias_method_chain :freeze, :memoizable
end
end
end
def freeze_with_memoizable
methods.each do |method|
__send__($1) if method.to_s =~ /^_unmemoized_(.*)/
end unless frozen?
freeze_without_memoizable
end
end
def memoize(*symbols)
symbols.each do |symbol|
original_method = "_unmemoized_#{symbol}"
memoized_ivar = "@_memoized_#{symbol}"
class_eval <<-EOS, __FILE__, __LINE__
include Freezable
raise "Already memoized #{symbol}" if method_defined?(:#{original_method})
alias #{original_method} #{symbol}
if instance_method(:#{symbol}).arity == 0
def #{symbol}(reload = false)
if !reload && defined? #{memoized_ivar}
#{memoized_ivar}
else
#{memoized_ivar} = #{original_method}.freeze
end
end
else
def #{symbol}(*args)
#{memoized_ivar} ||= {}
reload = args.pop if args.last == true || args.last == :reload
if !reload && #{memoized_ivar} && #{memoized_ivar}.has_key?(args)
#{memoized_ivar}[args]
else
#{memoized_ivar}[args] = #{original_method}(*args).freeze
end
end
end
EOS
end
end
end
end
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