require 'active_support/core_ext/object/metaclass' module ActiveSupport module SafelyMemoizable def safely_memoize(*symbols) symbols.each do |symbol| class_eval <<-RUBY, __FILE__, __LINE__ + 1 def #{symbol}(*args) memoized = @_memoized_#{symbol} || ::ActiveSupport::ConcurrentHash.new memoized[args] ||= memoized_#{symbol}(*args) end RUBY end end end module Memoizable def self.memoized_ivar_for(symbol) "@_memoized_#{symbol.to_s.sub(/\?\Z/, '_query').sub(/!\Z/, '_bang')}".to_sym end module InstanceMethods 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 memoize_all unless frozen? freeze_without_memoizable end def memoize_all prime_cache ".*" end def unmemoize_all flush_cache ".*" end def prime_cache(*syms) syms.each do |sym| methods.each do |m| if m.to_s =~ /^_unmemoized_(#{sym})/ if method(m).arity == 0 __send__($1) else ivar = ActiveSupport::Memoizable.memoized_ivar_for($1) instance_variable_set(ivar, {}) end end end end end def flush_cache(*syms, &block) syms.each do |sym| methods.each do |m| if m.to_s =~ /^_unmemoized_(#{sym})/ ivar = ActiveSupport::Memoizable.memoized_ivar_for($1) instance_variable_get(ivar).clear if instance_variable_defined?(ivar) end end end end end def memoize(*symbols) symbols.each do |symbol| original_method = :"_unmemoized_#{symbol}" memoized_ivar = ActiveSupport::Memoizable.memoized_ivar_for(symbol) class_eval <<-EOS, __FILE__, __LINE__ + 1 include InstanceMethods # include InstanceMethods # if method_defined?(:#{original_method}) # if method_defined?(:_unmemoized_mime_type) raise "Already memoized #{symbol}" # raise "Already memoized mime_type" end # end alias #{original_method} #{symbol} # alias _unmemoized_mime_type mime_type # if instance_method(:#{symbol}).arity == 0 # if instance_method(:mime_type).arity == 0 def #{symbol}(reload = false) # def mime_type(reload = false) if reload || !defined?(#{memoized_ivar}) || #{memoized_ivar}.empty? # if reload || !defined?(@_memoized_mime_type) || @_memoized_mime_type.empty? #{memoized_ivar} = [#{original_method}] # @_memoized_mime_type = [_unmemoized_mime_type] end # end #{memoized_ivar}[0] # @_memoized_mime_type[0] end # end else # else def #{symbol}(*args) # def mime_type(*args) #{memoized_ivar} ||= {} unless frozen? # @_memoized_mime_type ||= {} unless frozen? reload = args.pop if args.last == true || args.last == :reload # reload = args.pop if args.last == true || args.last == :reload # if defined?(#{memoized_ivar}) && #{memoized_ivar} # if defined?(@_memoized_mime_type) && @_memoized_mime_type if !reload && #{memoized_ivar}.has_key?(args) # if !reload && @_memoized_mime_type.has_key?(args) #{memoized_ivar}[args] # @_memoized_mime_type[args] elsif #{memoized_ivar} # elsif @_memoized_mime_type #{memoized_ivar}[args] = #{original_method}(*args) # @_memoized_mime_type[args] = _unmemoized_mime_type(*args) end # end else # else #{original_method}(*args) # _unmemoized_mime_type(*args) end # end end # end end # end # if private_method_defined?(#{original_method.inspect}) # if private_method_defined?(:_unmemoized_mime_type) private #{symbol.inspect} # private :mime_type end # end EOS end end end end