ruby.observer.rb

ruby.observer.rb

require "observer"

class Tick
	include Observable
	
	def tick
		loop do
			now = Time.now
			changed
			
			notify_observers(now.hour, now.min, now.sec)
			
			sleep 1.0 - Time.now.usec / 1000000.0
		end
	end
end

class TextClock
	def update(h,m,s)
		printf "%02d:%02d:%02d \n", h, m, s
		STDOUT.flush
	end
end


tick = Tick.new
tick.add_observer(TextClock.new)
tick.tick