/**
  * Constructs the cache
  *
  * @param string A identifier which describes this cache
  * @param t3lib_cache_backend_Backend Backend to be used for this cache
  * @author Robert Lemke <*****@*****.**>
  * @throws InvalidArgumentException if the identifier doesn't match PATTERN_ENTRYIDENTIFIER
  * @internal
  */
 public function __construct($identifier, t3lib_cache_backend_Backend $backend)
 {
     parent::__construct($identifier, $backend);
     $this->initializeObject();
 }