/**
  * {@inheritdoc}
  */
 protected function doSave($id, $data, $lifeTime = 0)
 {
     if ($lifeTime > 30 * 24 * 3600) {
         $lifeTime = time() + $lifeTime;
     }
     return $this->memcached->set($id, $data, (int) $lifeTime);
 }