A simple class for retrying a block on an exception.

retryable.rb

class Retryable
  def self.retry_on(exception, times=2, handler=nil)
    retry_times = times || 2
    begin
      yield
    rescue exception => e
      handler.call if handler
      retry if (retry_times -= 1) > 0
    end 
  end
end

Example for using it here: https://gist.github.com/750065