public function notifyObjects($method, array $args = []) {
        if ($this->_classes) {
            foreach ($this->_classes as $options) {
                if (!$options['callback'] || in_array($options['alias'], $this->_restricted)) {
                    continue;
                }

                $object = $this->getObject($options['alias']);

                if ($object && method_exists($object, $method)) {
                    call_user_func_array([$object, $method], $args);
                }
            }
        }

        return $this;
    }