/**
   * Notify subscribers about outbound Client notifications.
   *
   * @param clientNotification Client notification to notify subscribers about.
   */
  public void notifyAboutOutboundClientNotification(final ClientNotification clientNotification) {

    for (final SubscriptionInternal<OutboundNotification> outboundNotificationSubscriptionInternal :
        outboundNotificationObservable.getSubscriptions()) {

      if (outboundNotificationSubscriptionInternal.getNotificationType() != null
          && outboundNotificationSubscriptionInternal
              .getNotificationType()
              .equals(clientNotification.getBaseNotificationType())) {

        final OutboundNotification outboundNotification =
            new OutboundNotification(clientNotification);

        new Handler(Looper.getMainLooper())
            .post(
                new Runnable() {
                  @Override
                  public void run() {
                    if (outboundNotificationSubscriptionInternal.getBatchListener() != null) {
                      List<OutboundNotification> outboundNotifications = new LinkedList<>();
                      outboundNotifications.add(outboundNotification);
                      outboundNotificationSubscriptionInternal
                          .getBatchListener()
                          .onNotification(outboundNotifications);
                    } else if (outboundNotificationSubscriptionInternal.getListener() != null) {
                      outboundNotificationSubscriptionInternal
                          .getListener()
                          .onNotification(outboundNotification);
                    }
                  }
                });
      }
    }
  }
  /**
   * Get all subscriptions registered for server notifications.
   *
   * @param category Category of server notification - {@link
   *     net.donky.core.network.ServerNotification#NOTIFICATION_CATEGORY_DONKY} or {@link
   *     net.donky.core.network.ServerNotification#NOTIFICATION_CATEGORY_CUSTOM}
   * @param type Type of notification that the subscriber is registered to listen for.
   * @return Subscriptions for given notification type.
   */
  public List<SubscriptionInternal<ServerNotification>> getSubscriptionsForServerNotification(
      String category, String type) {

    List<SubscriptionInternal<ServerNotification>> triggeredInboundNotificationSubscriptions =
        new LinkedList<>();

    NotificationObservable<ServerNotification> observable = null;

    if (ServerNotification.NOTIFICATION_CATEGORY_CUSTOM.equals(category)) {

      observable = inboundContentNotificationObservable;

    } else if (ServerNotification.NOTIFICATION_CATEGORY_DONKY.equals(category)) {

      observable = inboundDonkyNotificationObservable;
    }

    if (type != null && observable != null) {

      for (final SubscriptionInternal<ServerNotification> inboundNotificationSubscription :
          observable.getSubscriptions()) {

        if (inboundNotificationSubscription.getNotificationType() != null
            && inboundNotificationSubscription.getNotificationType().equals(type)) {

          triggeredInboundNotificationSubscriptions.add(inboundNotificationSubscription);
        }
      }
    }

    return triggeredInboundNotificationSubscriptions;
  }