sample/observ.rb

   1 #! /usr/local/bin/ruby
   2
   3 require "thread"
   4 require "observer"
   5
   6 class Tick
   7   include Observable
   8   def initialize
   9     Thread.start do
  10       loop do
  11         sleep 0.999
  12         now = Time.now
  13         changed
  14         notify_observers(now.hour, now.min, now.sec)
  15       end
  16     end
  17   end
  18 end
  19
  20 class Clock
  21   def initialize(tick)
  22     @tick = tick
  23     @tick.add_observer(self)
  24   end
  25   def update(h, m, s)
  26     printf "\e[8D%02d:%02d:%02d", h, m, s
  27     STDOUT.flush
  28   end
  29 end
  30
  31 clock = Clock.new(Tick.new)
  32 sleep