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Optimize the performance of #delegate

Remove the use of #__send__ in order to boost performance. This also
means that you can no longer delegate to private methods on the
target object.
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commit 1bac04e854b42fc0e47162e251105434d356d2b4 1 parent 1db54df
@dasch dasch authored dasch committed
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22 activesupport/lib/active_support/core_ext/module/delegation.rb
@@ -124,23 +124,27 @@ def delegate(*methods)
file, line = caller.first.split(':', 2)
line = line.to_i
- if allow_nil
- methods.each do |method|
+ methods.each do |method|
+ method = method.to_s
+
+ # Attribute writer methods only accept one argument. Makes sure []=
+ # methods still accept two arguments.
+ definition = (method =~ /[^\]]=$/) ? "arg" : "*args, &block"
+
+ if allow_nil
module_eval(<<-EOS, file, line - 2)
- def #{method_prefix}#{method}(*args, &block) # def customer_name(*args, &block)
+ def #{method_prefix}#{method}(#{definition}) # def customer_name(*args, &block)
if #{to} || #{to}.respond_to?(:#{method}) # if client || client.respond_to?(:name)
- #{to}.__send__(:#{method}, *args, &block) # client.__send__(:name, *args, &block)
+ #{to}.#{method}(#{definition}) # client.name(*args, &block)
end # end
end # end
EOS
- end
- else
- methods.each do |method|
+ else
exception = %(raise "#{self}##{method_prefix}#{method} delegated to #{to}.#{method}, but #{to} is nil: \#{self.inspect}")
module_eval(<<-EOS, file, line - 1)
- def #{method_prefix}#{method}(*args, &block) # def customer_name(*args, &block)
- #{to}.__send__(:#{method}, *args, &block) # client.__send__(:name, *args, &block)
+ def #{method_prefix}#{method}(#{definition}) # def customer_name(*args, &block)
+ #{to}.#{method}(#{definition}) # client.name(*args, &block)
rescue NoMethodError # rescue NoMethodError
if #{to}.nil? # if client.nil?
#{exception} # # add helpful message to the exception
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19 activesupport/test/core_ext/module_test.rb
@@ -60,6 +60,14 @@ class Someone < Struct.new(:name, :place)
delegate :name, :to => :client, :prefix => false
end
+class ParameterSet
+ delegate :[], :[]=, :to => :@params
+
+ def initialize
+ @params = {:foo => "bar"}
+ end
+end
+
class Name
delegate :upcase, :to => :@full_name
@@ -83,6 +91,17 @@ def test_delegation_to_assignment_method
assert_equal "Fred", @david.place.name
end
+ def test_delegation_to_index_get_method
+ @params = ParameterSet.new
+ assert_equal "bar", @params[:foo]
+ end
+
+ def test_delegation_to_index_set_method
+ @params = ParameterSet.new
+ @params[:foo] = "baz"
+ assert_equal "baz", @params[:foo]
+ end
+
def test_delegation_down_hierarchy
assert_equal "CHICAGO", @david.upcase
end
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