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105 lines
5.8 KiB
Ruby
105 lines
5.8 KiB
Ruby
require 'active_support/core_ext/kernel/singleton_class'
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require 'active_support/core_ext/module/aliasing'
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module ActiveSupport
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module Memoizable
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def self.memoized_ivar_for(symbol)
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"@_memoized_#{symbol.to_s.sub(/\?\Z/, '_query').sub(/!\Z/, '_bang')}".to_sym
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end
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module InstanceMethods
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def self.included(base)
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base.class_eval do
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unless base.method_defined?(:freeze_without_memoizable)
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alias_method_chain :freeze, :memoizable
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end
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end
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end
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def freeze_with_memoizable
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memoize_all unless frozen?
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freeze_without_memoizable
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end
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def memoize_all
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prime_cache ".*"
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end
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def unmemoize_all
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flush_cache ".*"
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end
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def prime_cache(*syms)
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syms.each do |sym|
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methods.each do |m|
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if m.to_s =~ /^_unmemoized_(#{sym})/
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if method(m).arity == 0
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__send__($1)
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else
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ivar = ActiveSupport::Memoizable.memoized_ivar_for($1)
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instance_variable_set(ivar, {})
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end
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end
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end
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end
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end
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def flush_cache(*syms)
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syms.each do |sym|
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(methods + private_methods + protected_methods).each do |m|
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if m.to_s =~ /^_unmemoized_(#{sym.to_s.gsub(/\?\Z/, '\?')})/
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ivar = ActiveSupport::Memoizable.memoized_ivar_for($1)
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instance_variable_get(ivar).clear if instance_variable_defined?(ivar)
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end
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end
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end
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end
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end
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def memoize(*symbols)
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symbols.each do |symbol|
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original_method = :"_unmemoized_#{symbol}"
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memoized_ivar = ActiveSupport::Memoizable.memoized_ivar_for(symbol)
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class_eval <<-EOS, __FILE__, __LINE__ + 1
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include InstanceMethods # include InstanceMethods
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#
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if method_defined?(:#{original_method}) # if method_defined?(:_unmemoized_mime_type)
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raise "Already memoized #{symbol}" # raise "Already memoized mime_type"
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end # end
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alias #{original_method} #{symbol} # alias _unmemoized_mime_type mime_type
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#
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if instance_method(:#{symbol}).arity == 0 # if instance_method(:mime_type).arity == 0
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def #{symbol}(reload = false) # def mime_type(reload = false)
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if reload || !defined?(#{memoized_ivar}) || #{memoized_ivar}.empty? # if reload || !defined?(@_memoized_mime_type) || @_memoized_mime_type.empty?
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#{memoized_ivar} = [#{original_method}] # @_memoized_mime_type = [_unmemoized_mime_type]
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end # end
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#{memoized_ivar}[0] # @_memoized_mime_type[0]
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end # end
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else # else
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def #{symbol}(*args) # def mime_type(*args)
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#{memoized_ivar} ||= {} unless frozen? # @_memoized_mime_type ||= {} unless frozen?
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reload = args.pop if args.last == true || args.last == :reload # reload = args.pop if args.last == true || args.last == :reload
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#
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if defined?(#{memoized_ivar}) && #{memoized_ivar} # if defined?(@_memoized_mime_type) && @_memoized_mime_type
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if !reload && #{memoized_ivar}.has_key?(args) # if !reload && @_memoized_mime_type.has_key?(args)
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#{memoized_ivar}[args] # @_memoized_mime_type[args]
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elsif #{memoized_ivar} # elsif @_memoized_mime_type
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#{memoized_ivar}[args] = #{original_method}(*args) # @_memoized_mime_type[args] = _unmemoized_mime_type(*args)
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end # end
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else # else
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#{original_method}(*args) # _unmemoized_mime_type(*args)
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end # end
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end # end
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end # end
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#
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if private_method_defined?(#{original_method.inspect}) # if private_method_defined?(:_unmemoized_mime_type)
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private #{symbol.inspect} # private :mime_type
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elsif protected_method_defined?(#{original_method.inspect}) # elsif protected_method_defined?(:_unmemoized_mime_type)
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protected #{symbol.inspect} # protected :mime_type
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end # end
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EOS
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end
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end
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end
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end
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