@Override
    public void setApplicationContext(ApplicationContext applicationContext) {
        super.setApplicationContext(applicationContext);
        if (notificationService == null) {
            notificationService = getBean(RpcNotificationService.class);
        }
    }
@param notificationBuffer should be a direct byte buffer of TurmsNotification
turms-server-common/src/main/java/im/turms/server/common/domain/notification/rpc/dto/SendNotificationRequest.java