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require "benchmark"
class Module
def delegate_new(*methods)
options = methods.pop
unless options.is_a?(Hash) && to = options[:to]
raise ArgumentError, "Delegation needs a target. Supply an options hash with a :to key as the last argument (e.g. delegate :hello, :to => :greeter)."
end
if options[:prefix] == true && to.to_s =~ /^[^a-z_]/
raise ArgumentError, "Can only automatically set the delegation prefix when delegating to a method."
end
prefix = options[:prefix] ? "#{options[:prefix] == true ? to : options[:prefix]}_" : ''
file, line = caller.first.split(':', 2)
line = line.to_i
methods.each do |method|
method_name = prefix + method.to_s
module_eval(<<-EOS, file, line - 1)
def #{method_name}(*args, &block)
ActiveSupport::Delegation.perform(self, #{to}, #{method.inspect}, #{method_name.inspect}, #{options[:allow_nil].inspect}, #{options[:to].inspect}, args, block)
end
EOS
end
end
def delegate_old(*methods)
options = methods.pop
unless options.is_a?(Hash) && to = options[:to]
raise ArgumentError, "Delegation needs a target. Supply an options hash with a :to key as the last argument (e.g. delegate :hello, :to => :greeter)."
end
if options[:prefix] == true && options[:to].to_s =~ /^[^a-z_]/
raise ArgumentError, "Can only automatically set the delegation prefix when delegating to a method."
end
prefix = options[:prefix] ? "#{options[:prefix] == true ? to : options[:prefix]}_" : ''
file, line = caller.first.split(':', 2)
line = line.to_i
methods.each do |method|
on_nil =
if options[:allow_nil]
'return'
else
%(raise "#{self}##{prefix}#{method} delegated to #{to}.#{method}, but #{to} is nil: \#{self.inspect}")
end
module_eval(<<-EOS, file, line - 5)
def #{prefix}#{method}(*args, &block) # def customer_name(*args, &block)
#{to}.__send__(#{method.inspect}, *args, &block) # client.__send__(:name, *args, &block)
rescue NoMethodError # rescue NoMethodError
if #{to}.nil? # if client.nil?
#{on_nil} # return # depends on :allow_nil
else # else
raise # raise
end # end
end # end
EOS
end
end
end
module ActiveSupport
module Delegation #:nodoc:
def self.perform(object, target, method, method_name, allow_nil, to, args, block)
target.__send__(method, *args, &block)
rescue NoMethodError
if target.nil?
return nil if allow_nil
raise "#{object.class}##{method_name} delegated to #{to}.#{method}, but #{to} is nil: #{object.inspect}"
else
raise
end
end
end
end
AMOUNT = 1000
class A
AMOUNT.times do |i|
define_method("hello#{i}") do
nil
end
end
end
class Old
def initialize
@a = A.new
end
end
class New
def initialize
@a = A.new
end
end
Benchmark.bmbm do |x|
x.report do
AMOUNT.times do |i|
Old.delegate_old "hello#{i}", :to => "@a"
end
end
x.report do
AMOUNT.times do |i|
New.delegate_new "hello#{i}", :to => "@a"
end
end
end
o = Old.new
n = New.new
Benchmark.bmbm do |x|
x.report do
AMOUNT.times do |i|
o.send("hello#{i}")
end
end
x.report do
AMOUNT.times do |i|
n.send("hello#{i}")
end
end
end
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