protected function assembleCacheEntryName($name)
 {
     $cacheEntryName = parent::assembleCacheEntryName($name);
     // some cache storages do not support space in key name
     $adjustedCacheEntryName = str_replace(' ', '_', $cacheEntryName);
     return $adjustedCacheEntryName;
 }
    protected function assembleCacheEntryName($name) {
        $cacheEntryName = parent::assembleCacheEntryName($name);

        // a cache storage might not support space in key name
        $adjustedCacheEntryName = isset($cacheEntryName) ? str_replace(' ', '_', $cacheEntryName) : NULL;

        return $adjustedCacheEntryName;
    }