Ruby interface

interface.rb

module Interface
  def ===(obj)
    self.instance_methods.all?{|m| obj.respond_to?(m)}
  end
end


module IService
  extend Interface

  def start
  end

  def stop
  end
end

class Object
  def interface(*params)
  end
end


class Nginx
  interface IService

  def start
    puts "starting nginx"
  end

  def stop
    puts "starting nginx"
  end
end

puts IService === Nginx.new