protected function readFromCache()
 {
     if ($this->global_cache->isActive()) {
         $data = $this->global_cache->get($this->getTableName() . '_raw_data');
         $cached_results = $this->global_cache->get($this->getTableName() . '_cached_results');
         if (is_array($data)) {
             $this->setRawData($data);
             $this->setCachedResults($cached_results);
             $this->setLoaded(true);
         }
     }
 }