protected function _has($name, $group)
{
if (!$this->enabled) {
return false;
}
return isset($this->cache_index[$group][$name]) && ($this->cache_index[$group][$name]['keep'] || $this->cache_index[$group][$name]['expires'] > time()) && $this->memcache->get($this->cache_index[$group][$name]['file']) !== false;
}