protected function includeAnnotationCache()
    {
        $annotationInfo = include $this->annotationCacheFilename;
        $this->annotationColumns = $annotationInfo['columns'];
        $this->annotationSort = $annotationInfo['sort'];
        if ($this->annotationSort) {
            $this->validateSortInfo($this->annotationSort, $this->annotationColumns);
        }
    }