/**
* Fetch requires a site_id and page_id
*
* @return string
*/
public function fetch($key)
{
if ($this->get_site_id() && $this->get_page_id()) {
return parent::fetch($key);
} else {
trigger_error('ReasonPageCache needs to be given a site id and page id in order to fetch a cached page .');
}
return '';
}