# File src/org/puremvc/ruby/core/view.rb, line 32
  def register_observer(notification_name, observer)
    observers = @observer_map[notification_name]
    if observers.nil?
      @observer_map[notification_name] = observer
    else
      observers = Array(@observer_map[notification_name])
      observers << observer
      @observer_map[notification_name] = observers
    end
  end