public function __call($method, $parameters)
{
switch ($method) {
case 'hasPingChangeFlag':
case 'addConfirmedKey':
case 'updateCollection':
case 'collectionExists':
case 'updateWindowSize':
return call_user_func_array(array($this->_cache, $method), $parameters);
}
throw new BadMethodCallException('Unknown method: ' . $method);
}