If this object’s changed state is true, invoke the update method in each currently associated observer in turn, passing it the given arguments. The changed state is then set to false.

Source Code

# File observer.rb, line 181
def notify_observers(*arg)
  if defined? @observer_state and @observer_state
    if defined? @observer_peers
      for i in @observer_peers.dup
        i.update(*arg)
      end
    end
    @observer_state = false
  end
end