public function getKeys(array $keys)
 {
     $results = parent::getKeys($this->prefixKeys($keys));
     if (!$results) {
         return array();
     }
     return array_combine($this->unprefixKeys(array_keys($results)), $results);
 }
 public function getKeys(array $keys)
 {
     $call_id = null;
     if ($this->getProfiler()) {
         $call_id = $this->getProfiler()->beginServiceCall(array('type' => 'kvcache-get', 'name' => $this->getName(), 'keys' => $keys));
     }
     $results = parent::getKeys($keys);
     if ($call_id !== null) {
         $this->getProfiler()->endServiceCall($call_id, array('hits' => array_keys($results)));
     }
     return $results;
 }