public virtual void StartProcess()
{
ReqMessage requestMsg = WaitForRequest();
ReqMessage responseMsg;
try
{
if (requestMsg.MessageType != MSG_DEF.INVALID_MSG)
{
responseMsg = ProcessIncomingRequest(requestMsg);
if (!SendResponse(responseMsg))
{
LOG.Info("{Message}", $"Error sending response message");
}
}
}
catch (Exception ex)
{
LOG.Fatal(ex, "{Message}", "Exception caught.");
}
finally
{
mSocket.Close();
LOG.Trace("EXIT");
}
}
protected bool SendResponse(ReqMessage msg_)
{
bool retVal = false;
Int32 bytesToSend = msg_.HeaderSize + msg_.BodySize;
Int32 sentBytes = 0;
Int32 totalSentBytes = 0;
Byte[] buffer_ = msg_.ToPByte();
try
{
while (totalSentBytes < bytesToSend && sentBytes >= 0)
{
sentBytes = mSocket.Send(buffer_, totalSentBytes, bytesToSend - totalSentBytes, SocketFlags.None);
totalSentBytes += sentBytes;
}
retVal = (totalSentBytes == bytesToSend);
}
catch (SocketException se)
{
LOG.Fatal(se, "{Message}", "SocketException caught.");
}
catch (ObjectDisposedException ode)
{
LOG.Fatal(ode, "{Message}", "ObjectDisposedException caught.");
}
catch (Exception ex)
{
LOG.Fatal(ex, "{Message}", "Exception caught.");
}
return(retVal);
}
ReqMessage WaitForRequest()
{
ReqMessage retVal = new ReqMessage(null);
const Int32 bufferSize = 8192;
Int32 totalBytesRecv;
Int32 bytesRecv;
Byte[] buffer = new Byte[bufferSize];
bool stopReceiving;
Int32 elapsedTime;
totalBytesRecv = 0;
elapsedTime = 0;
stopReceiving = false;
totalBytesRecv = 0;
while (!stopReceiving)
{
try
{
bytesRecv = 0;
while (!stopReceiving && bytesRecv >= 0)
{
bytesRecv = mSocket.Receive(buffer, totalBytesRecv, bufferSize - totalBytesRecv, SocketFlags.None);
if (bytesRecv > -1)
{
totalBytesRecv += bytesRecv;
}
}
}
catch (SocketException se)
{
LOG.Fatal(se, "{Message}", "SocketException caught.");
}
catch (ObjectDisposedException ode)
{
LOG.Fatal(ode, "{Message}", "ObjectDisposedException caught.");
break;
}
if (totalBytesRecv > 0)
{
retVal = ReqMessage.ReqMessageFromByteStream(buffer, ref totalBytesRecv);
stopReceiving = (retVal.MessageType != MSG_DEF.INVALID_MSG);
}
stopReceiving = stopReceiving || (elapsedTime > 5000);
Thread.Sleep(10);
elapsedTime += 10;
}//end while
return(retVal);
}
public static ReqMessage ReqMessageFromByteStream(Byte[] buffer_, ref Int32 bytesRead_)
{
ReqMessage retVal = new ReqMessage(null);
int offset = 0;
if (bytesRead_ >= retVal.HeaderSize)
{
//Message Type
retVal.MessageType = BitConverter.ToInt32(buffer_, offset);
offset += Marshal.SizeOf(retVal.MessageType);
//Body Size
retVal.BodySize = BitConverter.ToInt32(buffer_, offset);
offset += Marshal.SizeOf(retVal.BodySize);
//Checksum
retVal.Checksum = buffer_[offset];
offset += Marshal.SizeOf(retVal.Checksum);
//buffer didn't reach body
if (retVal.BodySize <= bytesRead_ - retVal.HeaderSize)
{
retVal.Body = new Byte[retVal.BodySize];
//get message body
Array.Copy(buffer_, retVal.HeaderSize, retVal.Body, 0, retVal.BodySize);
offset += retVal.BodySize;
//retVal.Checksum = buffer_[offset];
//test if trash was received
Byte recvChksum = retVal.Checksum;
if (recvChksum != retVal.GenerateChecksum())
{
retVal.Clear();
bytesRead_ = 0;
}
else
{
//adjust remaining bytes
Array.Copy(buffer_, retVal.HeaderSize + retVal.BodySize, buffer_, 0, bytesRead_ - retVal.HeaderSize - retVal.BodySize);
bytesRead_ -= (retVal.HeaderSize + retVal.BodySize);
}
}
else
{
retVal.Clear();
}
}
return(retVal);
}
protected virtual ReqMessage ProcessIncomingRequest(ReqMessage msg_)
{
ReqMessage retVal = new ReqMessage(null);
//this method is only executed if no ReqInstance derived class method is executed
//due to no existance of such derived class
LOG.Info("{Message}", $"Message type->{retVal.MessageType} received");
retVal.MessageType = 0;
retVal.Body = Marshaling.ByteStream.ToPByte("Derived ReqInstance not implemented\0");
retVal.BodySize = retVal.Body.Length;
return(retVal);
}
public static ReqMessage ReqMessageFromByteStream(ref List <Byte> byteStream_, ref Int32 bytesRead_)
{
Byte[] msgBytes = new byte[byteStream_.Count];
byteStream_.CopyTo(msgBytes);
ReqMessage retVal = ReqMessageFromByteStream(msgBytes, ref bytesRead_);
byteStream_.Clear();
for (int index = 0; index < bytesRead_; index++)
{
byteStream_.Add(msgBytes[index]);
}
return(retVal);
}
