From: James Edward Gray II <james@...>
Date: 2004-11-06T08:18:09+09:00
Subject: Threaded Observer

Help Thread gurus!  :D

Why is the following code not printing the time every three second the 
"Clock" is running, as I believe it should be?

#!/usr/bin/env ruby

require "observer"
require "singleton"

class Clock
	include Observable
	include Singleton
	
	def start( seconds_delay )
		@thread = Thread.new(self, seconds_delay) do |notifier, delay|
			loop do
				puts "Notifying..."
				notifier.notify_observers
				sleep delay
			end
		end
	end
	
	def stop
		unless @thread.nil?
			@thread.kill
			@thread = nil
		end
	end
end

if $0 == __FILE__
	class TimePrinter
		def update
			puts Time.now
		end
	end

	clock = Clock.instance
	clock.add_observer TimePrinter.new

	puts "Starting clock..."
	clock.start 3
	sleep 10
	clock.stop
	puts "Clock stopped..."
	sleep 10
end

__END__

Thanks.

James Edward Gray II