retryable.rb

class Integer
  def tries(options={}, &block)
    attempts          = self
    exception_classes = options[:on] || Exception
    exception_classes = exception_classes.is_a?(Array) ? exception_classes : [exception_classes]
    
    begin
      return yield
    rescue *exception_classes
      retry if (attempts -= 1) > 0
    end

    yield
  end
  
end

i = 0

3.tries :on => NoMethodError do

  puts i += 1
  Object.hello

end