code: public static String getCommClass(boolean asyncIOEnabled) {
          // Check to see if the TCP class has been changed from its default value.
          // If it hasn't and the native z/OS AIO support is ready and able then update the
          // class to use the native z/OS support.
          if ((commClass != null) && commClass.equals(commClassNio) && asyncIOEnabled) {
              commClass = commClassAio;
          }
  
          return commClass;
      }
docs: Access the TCP communication class to use (NIO, AIO, etc)
  
  @return String