def redis
      redis_master_source = @config.redis_server =~ /^\S+\:\d+$/ ? "server_string" : "master_file"
      _eigenclass_.class_eval <<-EVALS, __FILE__, __LINE__
        def redis
          redis_master_from_#{redis_master_source}
        end
      EVALS
      redis
    end
def redis
      redis_master_source = @config.redis_server =~ /^\S+\:\d+$/ ? "server_string" : "master_file"
      _eigenclass_.class_eval <<-EVALS, __FILE__, __LINE__
        def redis
          redis_master_from_#{redis_master_source}
        end
      EVALS
      redis
    end
get the Redis instance