public void sendNotifcationToTags(
      String apiKey, String tag, String title, String message, String uri, boolean save) {

    Set<String> usernameSet = sessionManager.getUsernameSet(tag);
    if (usernameSet == null) {
      return;
    }
    Iterator<String> iterator = usernameSet.iterator();
    while (iterator.hasNext()) {
      String username = (String) iterator.next();
      System.out.println("sendNotifcationToTags--username:" + username);
      sendNotifcationToUser(apiKey, username, title, message, uri, save);
    }
  }