如何仅在一种协议上运行 Kryonet 服务器？

Question

I'm currently planning to use the Java networking library, Kryonet, for my game. I'm going to use the UDP protocol, as it is faster than TCP. I like the Kryonet API, its very clean code, however it appears to only allow running of servers, on both TCP and UDP, when I only want a server running on UDP.

Answer 1

I don't think you should make the assumption that UDP is "faster" than TCP. TCP SACK and NACK packets allow for faster retransmission requests than the older TCP sliding-window-only system, and the Explicit Congestion Notification enhancement makes it far easier for peers to communicate at a speed approaching the maximum the network can handle. (UDP would continue sending data oblivious to the congestion that leads to dropped packets.)

Test the bandwidth, latency, and packetloss between several intended peers and see which one performs better. I'll bet it comes out nearly the same.

Answer 2

Kryonet in fact does support connections with only one protocol, but this one protocol must be TCP. There are no UDP-only connections possible. TCP is mandatory.

Reason is, that kryonet uses TCP for all internal requests like server discovery, ping or the connection handshake. Doing this in UDP would require logic to deal with dropped or wrongly-ordered packages which kryonet just doesn't have implemented yet.