manage surrogate keys usign Redis

redis_key.rb

require 'redis'
require 'digest/sha1'

class RedisKey
  def initialize
    @redis = Redis.new
  end
  
  def surrogate_key(dimension, data)
    nk = Digest::SHA1.hexdigest(data)
    sk = @redis.get "#{dimension}/#{nk}"
    unless sk  
      sk = @redis.incr "#{dimension}/key"
      @redis.set "#{dimension}/#{nk}", sk
    end
    sk
  end
end