callback.rb

require 'rubygems'
require 'httparty'

def async(arg,wait,callback)
	Thread.new {
		sleep wait
		resp = HTTParty.get(arg)
		(wait == 10) ? callback.error("Failed to get resource") : callback.success(resp)
	}
	
end

host = "http://www.google.com"

threads = []
threads <<  async(host,10,obj)
puts "getting #{host}"
threads <<  async(host,1,obj)
puts "getting again.."
threads.each {|thr| thr.join }