private function _get_cache_extension()
{
$key_generator = new \Timber\Cache\KeyGenerator();
$cache_provider = new \Timber\Cache\WPObjectCacheAdapter($this);
$cache_strategy = new \Asm89\Twig\CacheExtension\CacheStrategy\GenerationalCacheStrategy($cache_provider, $key_generator);
$cache_extension = new \Asm89\Twig\CacheExtension\Extension($cache_strategy);
return $cache_extension;
}