From: Aa Aa <banditgsf600n@...>
Date: 2008-05-08T14:42:09+09:00
Subject: Re: Event handling

Oke, I've implemented the following observer/listener program:

class Cow
  def initialize
    @listeners = Array.new
  end

  def add_listener(listener)
    raise ArgumentError if !listener.respond_to?(:sound_event) && 
!listeners.include?(listener)
    @listeners << listener
  end

  def remove_listener(listener)
    @listeners.delete(listener)
  end

  def notify_listeners
    for i in 0...@listeners.length
      @listeners[i].sound_event('MHOEEEE')
    end
  end

  def be_happy
    notify_listeners
  end
end

class Program
  def sound_event(value)
    puts value
  end

  def start
    cow = Cow.new
    cow.add_listener(self)
    cow.be_happy
  end
end

Program.new.start

Is this an appropriate way of doing event handling in ruby?
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