Simple Ruby event dispatcher

dispatcher.rb

# simple event dispatcher implementation
module Evented
  class Dispatcher < Array
    def call *args; self.each do |e|; e.call *args end end
  end
  
  class Dispatchers < Hash
    def call name, *args; self[name].call(*args) if self[name] end
  end
  
  def dispatchers; @dispatchers ||= Dispatchers.new end
  def dispatcher name; dispatchers[name] ||= Dispatcher.new end
end

#class Cow
#  include Evented
#
#  attr_reader :name
#
#  def initialize name = nil; @name = name end
#  def moo; dispatcher("mooed").call self end
#end
#
#cow = Cow.new "Betsy"
#cow.dispatchers("mooed") << lambda { |c| puts "#{c.name} mooed." }
#cow.moo

I have created a little more complete version of an event dispatcher system : https://github.com/ThatAmine/event_dispatcher
I hope that it might be useful for someone.