/// <summary>
/// The thread that handles sending all messages.
/// </summary>
public void SendMessageThread()
{
while (mSendMessageThreadActive)
{
if (Connected == true)
{
try
{
//Get the next message if there is not a current one
if (mCurrentMsgToSend == null && SendMsgQueue.Count > 0)
{
lock (MsgSeqLock)
{
mCurrentMsgToSend = SendMsgQueue.Peek();
}
}
else if (mCurrentMsgToSend == null)
{
//Is it time to send a keep alive?
TimeSpan TimeSinceResponse = DateTime.Now.Subtract(mLastResponse);
TimeSpan TimeSinceLastMsgSent = DateTime.Now.Subtract(mLastMsgSent);
if ((TimeSinceResponse.TotalMilliseconds > (double)(iSleep * 1000)) && (TimeSinceLastMsgSent.TotalMilliseconds > (double)(iSleep * 1000)))
{
PFCSSendKeepAlive();
}
}
if (mCurrentMsgToSend != null)
{
bool blnSendItOut = false;
//Send it out if it hasn't been sent out before
if (mCurrentMsgToSend.SendInfo.LastSendTime == null) blnSendItOut = true;
else
{
//Send it out again if a response has been received, but it was an error
if (mCurrentMsgToSend.SendInfo.Response_Received == true &&
mCurrentMsgToSend.SendInfo.Response_Error != MessageErrors.ERR_NAK_A)
{
if (mCurrentMsgToSend.SendInfo.SendCount > miRetries)
{
lock (MsgSeqLock)
{
//Give up completely.
//We receive 3 bad responses. Must be something wrong with the message.
SendMsgQueue.Dequeue();
mCurrentMsgToSend = null;
}
}
else blnSendItOut = true;
}
else if (mCurrentMsgToSend.SendInfo.Response_Received == true &&
mCurrentMsgToSend.SendInfo.Response_Error == MessageErrors.ERR_NAK_A &&
mCurrentMsgToSend.SendInfo.LastSendTime.Value.AddSeconds(miInterval) < DateTime.Now)
{
//For some reason, for a NAK-A response we treat it as if we send it again 5 seconds later, instead of immediately.
//So don't set the Response Received for a NAK-A. Let the send message thread take care of automatic resend
if (mCurrentMsgToSend.SendInfo.SendCount > miRetries)
{
lock (MsgSeqLock)
{
//Give up completely.
//We receive 3 bad responses. Must be something wrong with the message.
SendMsgQueue.Dequeue();
mCurrentMsgToSend = null;
}
}
else blnSendItOut = true;
}
else if (mCurrentMsgToSend.SendInfo.LastSendTime.Value.AddSeconds(miInterval) < DateTime.Now)
{
//Send it out again if we haven't received a response yet.
if (mCurrentMsgToSend.SendInfo.SendCount > miRetries)
{
lock (MsgSeqLock)
{
//Leave it on the queue, bur reset the send dates and counts
mCurrentMsgToSend.SendInfo.SendCount = 0;
mCurrentMsgToSend.SendInfo.FirstSendTime = null;
mCurrentMsgToSend.SendInfo.LastSendTime = null;
mCurrentMsgToSend.SendInfo.Response_Received = false;
mCurrentMsgToSend.SendInfo.Response_Error = MessageErrors.ERR_NONE;
mCurrentMsgToSend = null;
}
blnSendItOut = false;
TCP_ErrorRecovery();
//Force a keep alive to send next
lock (MsgSeqLock)
{
SendMsg myMsg = new SendMsg();
myMsg.Initialize(new MsgSendInfo(), KeepAliveMessage());
mCurrentMsgToSend = myMsg;
}
blnSendItOut = true;
}
else
{
blnSendItOut = true;
}
}
}
//Send the message
if (blnSendItOut == true && mCurrentMsgToSend != null)
{
//Set the sequence number if its the first time sending the message
// But don't set the sequence number for an ACK/NAK
if (mCurrentMsgToSend.SendInfo.SendCount == 0)
{
if (mCurrentMsgToSend.MsgToSend.ResponseType == MessageResponseType.DataMessage)
{
if (mCurrentMsgToSend.MsgToSend.MsgType != MessageType.KeepAlive)
{
GetNextSeqNum();
}
lock (MsgSeqLock)
{
mCurrentMsgToSend.MsgToSend.SequenceNum = LastMsgSeqNum;
}
}
}
//Update the send information, such as date/time,send count and set response received to false
DateTime TimeSent = DateTime.Now;
lock (MsgSeqLock)
{
mCurrentMsgToSend.SendInfo.LastSendTime = TimeSent;
if (mCurrentMsgToSend.SendInfo.FirstSendTime == null) mCurrentMsgToSend.SendInfo.FirstSendTime = TimeSent;
mCurrentMsgToSend.SendInfo.SendCount++;
mCurrentMsgToSend.SendInfo.Response_Received = false;
mCurrentMsgToSend.SendInfo.Response_Error = MessageErrors.ERR_NONE;
}
mLastMsgSent = DateTime.Now;
Send(mCurrentMsgToSend.MsgToSend.ToByteArray());
if (MessageSent != null) MessageSent(this, new MessageReceivedEventArgs(mCurrentMsgToSend.MsgToSend));
if (mCurrentMsgToSend != null)
{
if (mCurrentMsgToSend.MsgToSend.ResponseType == MessageResponseType.ACK ||
mCurrentMsgToSend.MsgToSend.ResponseType == MessageResponseType.NAK)
lock (MsgSeqLock)
{
if (SendMsgQueue.Count > 0 && mCurrentMsgToSend == SendMsgQueue.Peek()) RemoveFromQueue();
mCurrentMsgToSend = null; //don't wait for a response or resend an ACK or NAK. just remove it from the queue
}
}
}
}
}
catch (Exception ex)
{
if (StateChanged != null) StateChanged(this, new StateChangeEventArgs(StateChange.ErrorHappened, ex.ToString()));
TCP_ErrorRecovery();
}
}
else //not connected
{
if (!Connected && PortType == PORT_TYPE.Soliciated && mBuffering == false)
{
SendMsgQueue.Clear();
if (mCurrentMsgToSend != null)
{
if (mCurrentMsgToSend.MsgToSend.MsgType == MessageType.SendingTestResults) mCurrentMsgToSend = null;
}
}
}
Thread.Sleep(100);
}
}
private void CheckConnectionThread()
{
bool lastConnectState = false;
DateTime lastConnectionTry;
DateTime.TryParse("1/1/2000", out lastConnectionTry);
while (mConnectionThreadActive)
{
try
{
//Raise connected event if connected state changed. Need to check before and after the connection section to make sure event gets raised.
if (lastConnectState != Connected)
{
lastConnectState = Connected;
DateTime.TryParse("1/1/2000", out mLastResponse);
DateTime.TryParse("1/1/2000", out mLastMsgSent);
if (lastConnectState == true)
{
mLastResponse = DateTime.Now;
lastConnectionTry = DateTime.Now;
if (mCurrentMsgToSend == null)
{
//Force a keep alive to send next
lock (MsgSeqLock)
{
SendMsg myMsg = new SendMsg();
myMsg.Initialize(new MsgSendInfo(), KeepAliveMessage());
mCurrentMsgToSend = myMsg;
}
}
if (StateChanged != null) StateChanged(this, new StateChangeEventArgs(StateChange.Connected, "Connected"));
}
else
{
if (StateChanged != null) StateChanged(this, new StateChangeEventArgs(StateChange.Disconnected, "Disconnected"));
//Clear the send dates and counts for the current message
lock (CurrMsgLock)
{
if (mCurrentMsgToSend != null)
{
mCurrentMsgToSend.SendInfo.SendCount = 0;
mCurrentMsgToSend.SendInfo.FirstSendTime = null;
mCurrentMsgToSend.SendInfo.LastSendTime = null;
mCurrentMsgToSend.SendInfo.Response_Received = false;
mCurrentMsgToSend.SendInfo.Response_Error = MessageErrors.ERR_NONE;
}
}
}
}
TimeSpan ts_LastConnectionTry = DateTime.Now - lastConnectionTry;
TimeSpan ts_LastResponse = DateTime.Now - mLastResponse;
if (!Connected && mblnOKToConnect)
{
if (ts_LastConnectionTry.TotalMilliseconds > miConnect * 1000)
{
if (StateChanged != null) StateChanged(this, new StateChangeEventArgs(StateChange.TryingToConnect, "Trying to connect..."));
base.Connect();
lastConnectionTry = DateTime.Now;
}
}
else if (ts_LastResponse.TotalMilliseconds > miSleep * 1000 * 2)
{
if (StateChanged != null) StateChanged(this, new StateChangeEventArgs(StateChange.Disconnecting, "Disconnecting..."));
base.Disconnect();
ClearBuffers();
}
else if (mblnOKToConnect == false)
{
if (StateChanged != null) StateChanged(this, new StateChangeEventArgs(StateChange.Disconnecting, "Disconnecting..."));
base.Disconnect();
ClearBuffers();
}
//Raise connected event if connected state changed. Need to check before and after the connection section to make sure event gets raised.
if (lastConnectState != Connected)
{
lastConnectState = Connected;
DateTime.TryParse("1/1/2000", out mLastMsgSent);
DateTime.TryParse("1/1/2000", out mLastResponse);
if (lastConnectState == true)
{
mLastResponse = DateTime.Now;
lastConnectionTry = DateTime.Now;
if (mCurrentMsgToSend == null)
{
//Force a keep alive to send next
lock (MsgSeqLock)
{
SendMsg myMsg = new SendMsg();
myMsg.Initialize(new MsgSendInfo(), KeepAliveMessage());
mCurrentMsgToSend = myMsg;
}
}
if (StateChanged != null) StateChanged(this, new StateChangeEventArgs(StateChange.Connected, "Connected"));
}
else
{
if (StateChanged != null) StateChanged(this, new StateChangeEventArgs(StateChange.Disconnected, "Disconnected"));
//Clear the send dates and counts for the current message
lock (CurrMsgLock)
{
if (mCurrentMsgToSend != null)
{
mCurrentMsgToSend.SendInfo.SendCount = 0;
mCurrentMsgToSend.SendInfo.FirstSendTime = null;
mCurrentMsgToSend.SendInfo.LastSendTime = null;
mCurrentMsgToSend.SendInfo.Response_Received = false;
mCurrentMsgToSend.SendInfo.Response_Error = MessageErrors.ERR_NONE;
}
}
}
}
Thread.Sleep(1000);
}
catch(Exception ex)
{
if (mConnectionThreadActive == true) if (StateChanged != null) StateChanged(this, new StateChangeEventArgs(StateChange.ErrorHappened, ex.ToString()));
}
}
}
public void Send(Message_Upload msg)
{
//add it to the queue to send and let the send message thread take care of it.
lock (MsgSeqLock)
{
//Get rid of any data on the queue that is older than one hour
while (SendMsgQueue.Count > 0 && SendMsgQueue.Peek().MsgToSend.Age > 60000 * 60)
{
RemoveFromQueue();
}
//queue it up.
SendMsg myMsg = new SendMsg();
myMsg.Initialize(new MsgSendInfo(), msg);
SendMsgQueue.Enqueue(myMsg);
//Save it to a file, in case of power loss or program shuts down.
SerializeQueueToXML();
}
}