// the other end just sent us a message
// and it told us the latest message it got
// and the ack mask
private void AckPackets(ushort receiveSequence, ulong ackMask)
{
while (sendWindow.Count > 0)
{
PacketEnvelope envelope = sendWindow.Peek();
int distance = (int)sequencer.Distance(envelope.Sequence, receiveSequence);
if (distance > 0)
{
break;
}
sendWindow.Dequeue();
// if any of these cases trigger, packet is most likely lost
if ((distance <= -ACK_MASK_BITS) || ((ackMask & (1UL << -distance)) == 0UL))
{
NotifyLost?.Invoke(this, envelope.Token);
}
else
{
NotifyDelivered?.Invoke(this, envelope.Token);
}
}
}
/// <summary>
/// Sends a message, but notify when it is delivered or lost
/// </summary>
/// <typeparam name="T">type of message to send</typeparam>
/// <param name="message">message to send</param>
/// <param name="token">a arbitrary object that the sender will receive with their notification</param>
public void SendNotify <T>(T message, object token, int channelId = Channel.Unreliable)
{
if (sendWindow.Count == WINDOW_SIZE)
{
NotifyLost?.Invoke(this, token);
return;
}
using (PooledNetworkWriter writer = NetworkWriterPool.GetWriter())
{
var notifyPacket = new NotifyPacket
{
Sequence = (ushort)sequencer.Next(),
ReceiveSequence = receiveSequence,
AckMask = receiveMask
};
sendWindow.Enqueue(new PacketEnvelope
{
Sequence = notifyPacket.Sequence,
Token = token
});
MessagePacker.Pack(notifyPacket, writer);
MessagePacker.Pack(message, writer);
NetworkDiagnostics.OnSend(message, channelId, writer.Length, 1);
Send(writer.ToArraySegment(), channelId);
lastNotifySentTime = Time.unscaledTime;
}
}
