protected function _processCache($sKey, $mContents)
    {
        // looking for cache meta
        $aCacheMeta = $this->getCacheMeta($sKey);
        $blSerialize = isset($aCacheMeta["serialize"]) ? $aCacheMeta["serialize"] : true;

        if ($blSerialize) {
            $mContents = serialize($mContents);
        } else {
            $mContents = "<?php\n//automatically generated file\n//" . date("Y-m-d H:i:s") . "\n\n\$_aCacheContents = " . var_export($mContents, true) . "\n?>";
        }

        return $mContents;
    }