code: function(callback){
  			var self = this;
  			if(!this.id){
  				return process.nextTick(function(){
  					callback(new Error("Invalid session ID"));
  				});
  			}
  
  			options.client.get(options.keyspace + self.id, function(error, resp){
  				if(error)
  					return callback(error);
  				try{
  					resp = JSON.parse(resp);
  				}catch(e){
  					return callback(e);
  				}
  				extendSession(self, resp);
  				callback();
  			});
  		}
docs: reload a session data from redis