gistfile1.rb

require 'celluloid'

module Simulation
  module Asynchronous

    def self.extended(base)
      define_method(:method_added) do |*args|
        if args[0].to_s == "run" and not base.included_modules.member? Celluloid
          include Celluloid
          define_asynchronous_method(base, :run)
        end
      end
    end
  
    def define_asynchronous_method(base, method)
      base.__send__(:alias_method, "#{method}_synchronous".to_sym, method)
      base.class_eval <<-METHOD, __FILE__, __LINE__ + 1
        def #{method}(*args)
          future.#{method}_synchronous
        end
      METHOD
    end
  end
end

# class A
#   extend Simulation::Asynchronous

#   def run
#     sleep 2
#     return 15
#   end
# end