public Receive SendHandlers(ChannelRegistration registration)
{
return message =>
{
var send = message as Udp.Send;
if (send != null && HasWritePending)
{
if (Udp.Setting.TraceLogging) _log.Debug("Dropping write because queue is full");
Sender.Tell(new Udp.CommandFailed(send));
return true;
}
if (send != null && send.Payload.IsEmpty)
{
if (send.WantsAck)
Sender.Tell(send.Ack);
return true;
}
if (send != null)
{
_pendingSend = send;
_pendingCommander = Sender;
var dns = send.Target as DnsEndPoint;
if (dns != null)
{
var resolved = Dns.ResolveName(dns.Host, Context.System, Self);
if (resolved != null)
{
try
{
_pendingSend = new Udp.Send(_pendingSend.Payload, new IPEndPoint(resolved.Addr, dns.Port), _pendingSend.Ack);
DoSend(registration);
}
catch (Exception ex)
{
Sender.Tell(new Udp.CommandFailed(send));
_log.Debug("Failure while sending UDP datagram to remote address [{0}]: {1}", send.Target, ex);
_retriedSend = false;
_pendingSend = null;
_pendingCommander = null;
}
}
}
else
{
DoSend(registration);
}
return true;
}
if (message is SelectionHandler.ChannelWritable && HasWritePending)
{
DoSend(registration);
return true;
}
return false;
};
}
private void DoSend(ChannelRegistration registration)
{
var buffer = Udp.BufferPool.Acquire();
try
{
buffer.Clear();
_pendingSend.Payload.CopyToBuffer(buffer);
buffer.Flip();
var writtenBytes = Channel.Send(buffer, _pendingSend.Target);
if (Udp.Setting.TraceLogging) _log.Debug("Wrote [{0}] bytes to channel", writtenBytes);
// Datagram channel either sends the whole message, or nothing
if (writtenBytes == 0)
{
if (_retriedSend)
{
_pendingCommander.Tell(new Udp.CommandFailed(_pendingSend));
_retriedSend = false;
_pendingSend = null;
_pendingCommander = null;
}
else
{
registration.EnableInterest(SocketAsyncOperation.Send);
_retriedSend = true;
}
}
else
{
if (_pendingSend.WantsAck) _pendingCommander.Tell(_pendingSend.Ack);
_retriedSend = false;
_pendingSend = null;
_pendingCommander = null;
}
}
finally
{
Udp.BufferPool.Release(buffer);
}
}
