/// <summary>
/// Analyse the result of the select() call for the specified KAS.
/// </summary>
private void UpdateStateAfterSelect(TbxAppServer k, SelectSockets selectSockets)
{
try
{
k.CheckNoMessageReceivedInvariant();
// We have nothing to do if we don't have an established TCP
// connection.
if (k.ConnStatus != TcmAppServerConStatus.Connected &&
k.ConnStatus != TcmAppServerConStatus.RoleReply)
{
return;
}
// Perform transfers only if the socket is ready.
Debug.Assert(k.Tunnel.Sock != null);
if (!selectSockets.InReadOrWrite(k.Tunnel.Sock))
{
return;
}
// Do up to 20 transfers (the limit exists for quenching purposes).
for (int i = 0; i < 20; i++)
{
// Send a message if possible.
k.SendNextQueuedMsgIfNeeded();
// Remember if we are sending a message.
bool sendingFlag = k.Tunnel.IsSendingMessage();
// Do transfers.
k.Tunnel.DoXfer();
// Stop if no message has been received and no message has been sent.
if (!k.Tunnel.HasReceivedMessage() &&
(!sendingFlag || k.Tunnel.IsSendingMessage()))
{
break;
}
// Process the message received.
if (k.Tunnel.HasReceivedMessage())
{
ProcessIncomingAppServerMessage(k, k.Tunnel.GetMsg());
}
}
k.CheckNoMessageReceivedInvariant();
}
catch (Exception ex)
{
HandleDisconnectedKas(k, ex);
}
}
/// <summary>
/// Add the socket of the KAS in the select sets as needed and manage
/// ktlstunnel.exe processes.
/// </summary>
private void PrepareStateForSelect(TbxAppServer k, SelectSockets selectSockets, bool quenchFlag,
ref bool connWatchFlag)
{
// Note: the KAS should never have received a message when this function
// is called. The function UpdateStateAfterSelect() is responsible for
// doing all the transfers and handling any message received after these
// transfers.
try
{
k.CheckNoMessageReceivedInvariant();
if (k.ConnStatus == TcmAppServerConStatus.Scheduled)
{
// Start ktlstunnel.exe.
k.ConnStatus = TcmAppServerConStatus.Connecting;
k.Tunnel.BeginConnect();
}
if (k.ConnStatus == TcmAppServerConStatus.Connecting)
{
// The TCP connection is now open.
if (k.Tunnel.CheckConnect(0))
{
// Send the select role command.
k.SendSelectRoleMsg();
// Wait for the reply to arrive.
k.ConnStatus = TcmAppServerConStatus.RoleReply;
}
// Wait for the TCP connection to be established. We busy wait
// to monitor the status of ktlstunnel.exe regularly, to detect
// the case where the connection fails.
else
{
connWatchFlag = true;
}
}
if (k.ConnStatus == TcmAppServerConStatus.RoleReply)
{
// Wait for the reply to arrive.
if (!quenchFlag)
{
k.Tunnel.UpdateSelect(selectSockets);
}
}
if (k.ConnStatus == TcmAppServerConStatus.Connected)
{
// Send the next message, if possible.
k.SendNextQueuedMsgIfNeeded();
if (!quenchFlag)
{
k.Tunnel.UpdateSelect(selectSockets);
}
}
k.CheckNoMessageReceivedInvariant();
}
catch (Exception ex)
{
HandleDisconnectedKas(k, ex);
}
}