class User_Session_Couchbase_Storage extends User_Session_Storage_Interface
{
    private $exist=true;
    private static $host,$user,$password,$bucket,$isConnected=false,$connection;

    function __construct($host,$user,$password,$bucket)
    {
        self::setConnection($host,$user,$password,$bucket);
    }

    static function setConnection($host,$user,$password,$bucket)
    {
        self::$host = $host;
        self::$user = $user;
        self::$password = $password;
        self::$bucket = $bucket;

        if(!self::$isConnected) {
            self::$connection  = new Couchbase(self::$host, self::$user, self::$password, self::$bucket);
            self::$isConnected = true;
        }
    }

    public function get($id)
    {
        if(!$this->exist) {
            $data = self::$connection->get($id);
            if(self::$connection->getResultCode() == COUCHBASE_KEY_ENOENT){
                $this->exist = false;
            } else {
                $this->exist = true;
                return $data;
            }
        }
    }

    public function set($id,$data,$time)
    {
        if(strlen($data) > 6) {
            $this->get($id);

            if(!$this->exist) {
                self::$connection->add($id,$data,1296000);
            } else {
                self::$connection->replace($id,$data,1296000);
            }
        }
    }

    public function create($id,$data,$time)
    {
        //not used
    }

    public function clean($time)
    {
        //not used
    }
    public function optimize()
    {
        //not used
    }

    public function remove($id)
    {
        self::$connection->delete($id);
    }
}