Codigo para reemplzar el send... No funciona bien todavia

method_observer.rb

class MethodObserver

  attr_reader :aspects

  def self.get_instance
    @instance == nil ? @instance = new : @instance
  end

  private
  def initialize
    @aspects = Array.new
    puts 'Empieza la magia negra'
    Object.class_eval do
      alias :old_send :send

      def send(method,*args)
        #MethodObserver.get_instance.call_before_method(method, self)
        puts 'Estoy escribiendo antes'
        if args.length == 0
          self.old_send method
        else
          self.old_send method, args
        end
        puts 'Estoy escribiendo despues'
        #MethodObserver.get_instance.call_after_method(method, self)
      end
    end
  end

  public
  def add_aspect(aspect)
    @aspects << aspect
  end

  def remove_aspect aspect
    @aspects.delete(aspect)
  end

  def remove_all
    @aspects.clear
  end

  def call_before_method(a_method,a_class)
    @aspects.each do |aspect|
      aspect.before_method a_method, a_class
    end
  end

  def call_after_method(a_method,a_class)
    @aspects.each do |aspect|
      aspect.after_method a_method, a_class
    end
  end

  def collect_aspects(a_method,a_class)

  end

end