rails 3.1 reloader - holds reloading in dev mode untill some file is modified

reloader.rb

module Reloader
  def run_callbacks(*args)
    case args.first.to_sym
    when :prepare
      # allow call to ActionDispatch.prepare!
      # or when source was updated
      # cleanup before every preload
      if @app.nil? or changed?
        reset!
        super(:cleanup)
        super
      end
    when :cleanup
      unless @app.nil? # skip call to ActionDispatch.cleanup!
        # this is called after catching exception
        # we need to force preloading in next request
        force! 
        super
      end
    else
      super
    end
  end

  private

  def changed?
    force? or ActiveSupport::Dependencies.autoload_paths.map do |p|
        Dir["#{p}/**/*.rb"].map{|f| File.mtime(f) }
    end.flatten.max > timestamp
  end

  def timestamp
    @timestamp or reset!
  end

  def reset!
    @force = false
    @timestamp = Time.now
  end

  def force!
    @force = true
  end

  def force?
    !!@force
  end

end

ActiveSupport.on_load(:before_initialize) do
  ActionDispatch::Reloader.send(:include, Reloader)
end