module DRb::DRbObservable

def notify_observers(*arg)
  if defined? @observer_state and @observer_state
    if defined? @observer_peers
      @observer_peers.each do |observer, method|
        begin
          observer.__send__(method, *arg)
        rescue
          delete_observer(observer)
        end
      end
    end
    @observer_state = false
  end
end