CacheEngine::fetchValue PHP Метод

    public abstract function fetchValue($p_key);

 /**
  * Fetch an object from cache.
  *
  * @param string
  *    The cache key of the object
  *
  * @return mixed
  *               The unserialized data.
  */
 public function fetch($p_key)
 {
     if (!self::$m_enabled) {
         return false;
     }
     self::$m_fetchRequests++;
     $serial = $this->m_cacheEngine->fetchValue($this->genKey($p_key));
     if ($serial !== false) {
         self::$m_hits++;
     } else {
         if (!isset(self::$m_missKeys[$p_key])) {
             self::$m_missKeys[$p_key] = 1;
         } else {
             self::$m_missKeys[$p_key]++;
         }
         return false;
     }
     return $this->unserialize($serial);
 }