Alan Bateman wrote:
setTrafficClass on a server socket, so that a certain TOS value will be
present in the ACK packet when TCP accepts a connection. This would
occur
automatically because all socket flags are inherited during
construction of
the native socket on the backlog queue, then Java turns off the timeout
setting when it constructs a Socket around it during accept() (which is
another historical curiousity AFAICS).
I can't find my link to the NIO2 documentation but is there way to do
that
in NIO2? Generally speaking it should be possible to (pre)-set every
socket
option on a server socket.
1. I've just come across a situation where a user needs to call
There is an RFE tracking this for java.net.ServerSocket:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6727157
To my knowledge it hasn't been a priority (pun not intended), or are
least it is very rare to find anyone that needs it. Someone from the
networking group is best to respond to this but I suspect it needs a
broader re-examination of the QoS topic to see what, if anything,
should be done.
QoS isn't in the scope of NIO2/JSR-203 which is why we didn't do
anything on this topic. However, we did define NetworkChannel and
retrofitted the existing network channels to implement it. That gives
us the flexibility to add implementation-specific socket options where
required (ie: don't need a setter/getter per option as we do with
classic networking).
We did something similar before in ServerSocket with the
setReceiveBufferSize() method.
But if this is required for NIO, then adding it to ServerSocket, is
probably not what you want.
- Michael
