const socket = new SockJS(GajiIdSettings.API_ADDRESS + NotificationConstants.MAIN_NOTIF_URI);
      const stompClient = Stomp.over(socket);
      stompClient.debug = null; // disable Stomp log, comment this line to see the log
      stompClient.connect({}, (frame) => {
        stompClient.subscribe(NotificationConstants.TOPIC_NOTIF_ALL, (msg) => {
          this.onNotificationData(msg);
        });
        stompClient.subscribe(NotificationConstants.TOPIC_NOTIF + '/' + this.userLogin.id, (msg) => {
          this.onNotificationData(msg);
        });
      });