protected function getPlaceholders(GenericEvent $event)
    {
        return array(
            '%eventname%' => $event['eventname'],
            '%source%'    => $event['source'],
            '%filename%'  => $event->hasArgument('file') ? $event['file'] : '',
            '%error%'     => $event->hasArgument('error') ? $event['error'] : '',
            '%profile%'   => $event->hasArgument('profile') ? $event['profile'] : '',
            '%message%'   => $event->hasArgument('message') ? $event['message'] : '',
        );
    }