/**
* @param \callable $callback
* @param array $args
* @param mixed $cacheKeySuffix
* @return string
*/
protected function getCallbackCacheKey($callback, $args = array(), $cacheKeySuffix = null)
{
$key = parent::getCallbackCacheKey($callback, $args, $cacheKeySuffix);
if (strpos($key, ' ') !== false) {
$key = md5($key);
}
return $key;
}
