@Override
protected int peek(InetAddress sender) throws IOException {
// We don't actually want the data: we just want the DatagramPacket's filled-in address.
DatagramPacket packet = new DatagramPacket(EmptyArray.BYTE, 0);
int result = peekData(packet);
// Note: evil side-effect on InetAddress! This method should have returned InetSocketAddress!
sender.ipaddress = packet.getAddress().getAddress();
return result;
}
private void doRecv(DatagramPacket pack, int flags) throws IOException {
IoBridge.recvfrom(
false,
fd,
pack.getData(),
pack.getOffset(),
pack.getLength(),
flags,
pack,
isNativeConnected);
if (isNativeConnected) {
updatePacketRecvAddress(pack);
}
}
/**
* Set the received address and port in the packet. We do this when the Datagram socket is
* connected at the native level and the recvConnnectedDatagramImpl does not update the packet
* with address from which the packet was received
*
* @param packet the packet to be updated
*/
private void updatePacketRecvAddress(DatagramPacket packet) {
packet.setAddress(connectedAddress);
packet.setPort(connectedPort);
}
@Override
public void send(DatagramPacket packet) throws IOException {
int port = isNativeConnected ? 0 : packet.getPort();
InetAddress address = isNativeConnected ? null : packet.getAddress();
IoBridge.sendto(fd, packet.getData(), packet.getOffset(), packet.getLength(), 0, address, port);
}
@Override
public int peekData(DatagramPacket pack) throws IOException {
doRecv(pack, MSG_PEEK);
return pack.getPort();
}