code: public static String getSessionDirection(IoSessionEx session) {
          IoServiceEx service = session.getService();
          String connectionDirection;
  
          if (service instanceof IoAcceptorEx || service instanceof AbstractBridgeAcceptor) {
              connectionDirection = ACCEPT_DIRECTION;
          } else if (service instanceof IoConnectorEx || service instanceof AbstractBridgeConnector) {
              connectionDirection = CONNECT_DIRECTION;
          } else {
              connectionDirection = UNKNOWN_DIRECTION;
          }
  
          return connectionDirection;
      }
docs: Determine the session 'direction' (accept/connect/???). We need this to be determined just once, so that it hangs around
  after the session is closed.