gistfile1.rb

    def retrying(attempts, options = {})
      exception_class = options[:when] || Exception
      sleep_time = options[:sleep] || 0.seconds
      last_exception = nil
      attempts.each do
        begin
          return yield
        rescue exception_class => last_exception
          Kernel.sleep sleep_time.to_f
        end
      end
      raise last_exception
    end