Observerパターンで複数種類の通知を使い分けたい時どうするのかなって考えた

observer.rb

class Subject

  attr_reader :subject1, :subject2

  def initialize
    @subject1 = Object.new.extend(Observable)
    @subject2 = Object.new.extend(Observable)
  end

  def notify1
    @subject1.changed
    @subject1.notify_observers
  end

  def notify2
    @subject2.changed
    @subject2.notify_observers
  end

end

class Observer

  def initialize(subject)
    subject.subject1.add_observer(self, :update1)
    subject.subject2.add_observer(self, :update2)
  end

  def update1
    puts "updated 1"
  end

  def update2
    puts "updated 2"
  end

end

subject = Subject.new
observer = Observer.new(subject)
subject.notify1
subject.notify2