protected function relayNotification($message)
    {
        $message = json_encode($message);

        foreach ($this->listenClients as $client) {
            if ($client->getState() < Net_Notifier_WebSocket_Connection::STATE_CLOSING) {

                $this->log(
                    sprintf(
                        ' ... relaying message "%s" to %s ... ',
                        $message,
                        $client->getIPAddress()
                    ),
                    Net_Notifier_Logger::VERBOSITY_CLIENT
                );

                $client->writeText($message);

                $this->log(
                    'done' . PHP_EOL,
                    Net_Notifier_Logger::VERBOSITY_CLIENT,
                    false
                );
            }
        }
    }