code: public static void registerActivity(final EFapsSession _session)
      {
          if (_session.isLogedIn() && RegistryManager.getCache().containsKey(_session.getId())) {
              final UserSession userSession = RegistryManager.getCache().get(_session.getId());
              if (userSession.isInvalidated()) {
                  _session.invalidate();
              } else {
                  userSession.registerActivity();
              }
          }
      }
docs: Register activity.
  
  @param _session the session