A very very simple timer

timer.rb

require 'rubygems'
require 'eventmachine'

class Timer
  def initialize
    @run = false
    @timeout_proc = nil
  end
  
  # Run <tt>blk</tt> every <tt>every</tt> seconds during <tt>during</tt> seconds 
  def self.start( every = 1, during = 5, &blk )
    t = Timer.new()
    t.start( every, during, &blk )
  end
  
  # Run <tt>blk</tt> every <tt>every</tt> seconds during <tt>during</tt> seconds 
  def start( every = 1, during = 5, &blk )
    @run = true
    Thread.new do
      time = Time.now
      EventMachine.run do 
        reschedule = proc { |inc, block| 
          if Time.now - time > during
            self.stop
            @timeout_proc.call unless @timeout_proc.nil?
          else
            @timer = EM.add_timer(inc) { reschedule.call(inc, block) }
            block.call 
          end
        }
        @timer = EM.add_timer(every) { reschedule.call(every, blk) }
        blk.call
      end
    end
    return self
  end
  
  # Timeout !
  def timeout( &blk )
    @timeout_proc = blk
    return self
  end
  
  # Stop the timer
  def stop
    EM.stop_event_loop if @run
    @run = false
    return self
  end
end

## Example
if $0 == __FILE__
  t = Timer.start(5, 20) { 
    puts "Please, give me your name..."
  }.timeout {
    puts "Too late rabbit !!!"
    exit 0
  }

  r = $stdin.readline
  puts "Hello #{r}"
  
  t.stop
end