@Override
  public String getPortletId() {
    AssetRendererFactory<MBCategory> assetRendererFactory =
        AssetRendererFactoryRegistryUtil.getAssetRendererFactoryByClass(MBCategory.class);

    return assetRendererFactory.getPortletId();
  }
  protected void sendNotificationEvent(
      final MicroblogsEntry microblogsEntry, ServiceContext serviceContext) throws PortalException {

    final JSONObject notificationEventJSONObject = JSONFactoryUtil.createJSONObject();

    notificationEventJSONObject.put("className", MicroblogsEntry.class.getName());
    notificationEventJSONObject.put("classPK", microblogsEntry.getMicroblogsEntryId());
    notificationEventJSONObject.put(
        "entryTitle",
        MicroblogsUtil.getProcessedContent(
            StringUtil.shorten(microblogsEntry.getContent(), 50), serviceContext));

    AssetRendererFactory<MicroblogsEntry> assetRendererFactory =
        AssetRendererFactoryRegistryUtil.getAssetRendererFactoryByClass(MicroblogsEntry.class);

    AssetRenderer<MicroblogsEntry> assetRenderer =
        assetRendererFactory.getAssetRenderer(microblogsEntry.getMicroblogsEntryId());

    String entryURL = StringPool.BLANK;

    try {
      entryURL =
          assetRenderer.getURLViewInContext(
              serviceContext.getLiferayPortletRequest(),
              serviceContext.getLiferayPortletResponse(),
              null);
    } catch (Exception e) {
      if (_log.isDebugEnabled()) {
        _log.debug(e, e);
      }
    }

    notificationEventJSONObject.put("entryURL", entryURL);
    notificationEventJSONObject.put("userId", microblogsEntry.getUserId());

    final List<Long> receiverUserIds = MicroblogsUtil.getSubscriberUserIds(microblogsEntry);

    Callable<Void> callable =
        new Callable<Void>() {

          @Override
          public Void call() throws Exception {
            MessageBusUtil.sendMessage(
                DestinationNames.ASYNC_SERVICE,
                new NotificationProcessCallable(
                    receiverUserIds, microblogsEntry, notificationEventJSONObject));

            return null;
          }
        };

    TransactionCommitCallbackUtil.registerCallback(callable);
  }