code: public static PollTcpManagerNio create()
    {
      synchronized (_nioSelectManager) {
        if (_nioSelectManager.get() == null) {
          PollTcpManagerNio selectManager = new PollTcpManagerNio();
            
          if (selectManager.start()) {
            _nioSelectManager.set(selectManager);
          }
        }
  
        return _nioSelectManager.get();
      }
    }
docs: Returns a jni select manager.