/// <summary>
/// The HandleTx method is invoked to request that an instance
/// of the VfxTcpModule send the data in the specified message
/// block out to the peer system it is connected to.
/// </summary>
/// <param name="mb">
/// The message block that contains the data that is to be sent
/// to the peer system the module is connected to.
/// </param>
public void HandleTx(VfxMsgBlock mb)
{
if (_moduleState == ModuleStates.Module_State_Active)
{
// REC: Send all of the data in the buffer:
while (mb.Length() > 0)
{
IoContext ctx = null;
lock (_synchIoContextQueue)
{
if (_ioContextQueue.Count > 0)
{
ctx = _ioContextQueue.Dequeue();
}
}
if (ctx != null)
{
if (ctx._ipcBuffer.Remaining() >= mb.Length())
{
// REC: Append the contents of the buffer
// to the IO context's buffer and push it
// onto the outgoing queue:
ctx._ipcBuffer.UnsafeAppend(mb);
mb.RdIndex = mb.WrIndex;
InitiateSend(ctx, false);
}
else
{
// REC: Copy as much data as possible into
// the context and attempt to send that:
int txLength = ctx._ipcBuffer.Remaining();
ctx._ipcBuffer.UnsafeAppend(mb, txLength);
// REC: Adjust the source buffer's index:
mb.RdIndex += txLength;
InitiateSend(ctx, false);
}
}
else
{
// REC: Wait for a buffer to become available:
_eventTxBuffer.WaitOne();
}
}
}
}
/// <summary>
/// The UnsafeAppend method is invoked to conduct an unsafe copy
/// of the contents from an external messasge block into this one.
/// </summary>
/// <param name="src"></param>
unsafe public void UnsafeAppend(VfxMsgBlock src)
{
fixed(byte *pDst = &_buffer[WrIndex])
{
fixed(byte *pSrc = &src._buffer[src.RdIndex])
{
for (int i = 0; i != src.Length(); i++)
{
pDst[i] = pSrc[i];
}
}
}
WrIndex += src.Length();
}
/// <summary>
/// The HandleRxMessage method is invoked by the owner of an
/// instance of a session to inform it that data has arrived
/// from the peer system.
/// </summary>
/// <param name="mb">
/// The message block that contains the data received from
/// the peer system the session is communicating with.
/// </param>
public void HandleRxMessage(VfxEngine.Ipc.VfxMsgBlock mb)
{
string content = Encoding.ASCII.GetString(mb.Buffer, 0, mb.Length());
VfxFixParserResult fpr = _fixParser.Parse(content, null, null, null);
while (fpr.Status == VfxFixParserStatus.MsgComplete)
{
// REC: Adjust the read index in the message block
// to compensate for the number of bytes parsed from
// the incoming data stream:
mb.RdIndex += fpr.Consumed;
// REC: Crunch the message block to remove the data
// that has already been parsed:
mb.Crunch();
// REC: Reset the timestamp that is used to determine
// when the last message was received from the peer:
this._lastRxTicks = DateTime.Now.Ticks;
// REC: Determine if the message is a session layer
// message and process it accordingly:
FixField fldMsgType = fpr.Message.Header.GetField(35);
if (fldMsgType != null)
{
string strMsgType = fldMsgType.Content;
if (!string.IsNullOrEmpty(strMsgType))
{
switch (strMsgType)
{
case "A":
// Received a FIX logon message:
HandleSession_Logon(fpr.Message);
break;
case "0":
// Received a FIX heartbeat message:
HandleSession_Heartbeat(fpr.Message);
break;
case "1":
// Received a FIX test request:
HandleSession_TestRequest(fpr.Message);
break;
case "2":
// Received a FIX resend request:
HandleSession_Resend(fpr.Message);
break;
case "5":
// Received a FIX logout message:
HandleSession_Logout(fpr.Message);
break;
default:
// Received a message that should be
// routed to the session's owner:
HandleSession_Message(fpr.Message);
break;
}
}
else
{
// REC: If the session's identity hasn't been
// established yet, just throw an exception and
// let the session's owner shut it down:
if (_currentState == SessionStates.Session_Pending)
{
throw new ArgumentException("Initial message missing required field - FIX MsgType.");
}
else
{
// REC: The session has been established, so the
// session can send a reject message:
}
}
}
else
{
}
// REC: Attempt to parse another message from
// the buffer of data that has been received:
content = Encoding.ASCII.GetString(mb.Buffer, 0, mb.Length());
fpr = _fixParser.Parse(content, null, null, null);
}
// REC: If the parser couldn't extract a complete message
// from the supplied buffer, determine what to do next:
if (fpr.Status != VfxFixParserStatus.MsgComplete)
{
}
}
/// <summary>
/// The Append method is invoked to append the content of an
/// message block to the content of the current instance.
/// </summary>
/// <param name="src">
/// The message block that contains the data which is to be
/// copied into the message block's buffer.
/// </param>
public void Append(VfxMsgBlock src)
{
System.Array.Copy(src.Buffer, src.RdIndex, _buffer, WrIndex, src.Length());
WrIndex += src.Length();
}
/// <summary>
/// The HandleReceive_Entrypoint method is the entrypoint for
/// the buffering thread that is started by the module if the
/// module's owner has enabled incoming IO buffering.
/// </summary>
/// <param name="context"></param>
private void HandleReceive_Entrypoint(object context)
{
// REC: The fragment buffer is used when there is residual
// data remaining from a previously processed buffer. This
// is allocated at 2x the receive block size, in order for
// reducing the need to "expand" the fragment buffer when
// data is left over from a receive operation:
VfxMsgBlock rxFragment = new VfxMsgBlock(16384);
while (true)
{
// REC: Lock the pending receive queue and check whether or not
// there are any receive blocks waiting to be processed:
IoContext rxPending = null;
lock (this._synchRxPendingQueue)
{
if (this._rxPendingQueue.Count > 0)
{
rxPending = this._rxPendingQueue.Dequeue();
}
}
if (rxPending != null)
{
// REC: If there is data in the fragment buffer
// then we need to append the data from the incoming
// receive context to it:
if (rxFragment.Length() > 0)
{
rxFragment.Append(rxPending._ipcBuffer);
// REC: Dispatch from the fragment buffer instead
// of from the receive context:
EventHandler <VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
tmp(this, new VfxIpcEventArgs(rxFragment));
rxFragment.Crunch();
}
// REC: Reset the pointers in the receive context
// since its data has been copied to the fragment
// buffer for subsequent processing:
rxPending._ipcBuffer.RdIndex = rxPending._ipcBuffer.WrIndex = 0;
}
else
{
// REC: There is no fragment remaining from the previous
// receive operation, so we can just dispatch directly from
// the received context:
EventHandler <VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
tmp(this, new VfxIpcEventArgs(rxPending._ipcBuffer));
rxPending._ipcBuffer.Crunch();
}
// REC: Determine if there is a fragment in the buffer
// so that we can chain it to subsequent blocks:
if (rxPending._ipcBuffer.Length() > 0)
{
// REC: There is a fragment of a message remaining
// in the current buffer, so it has to be copied into
// the fragment buffer for further processing:
rxFragment.Append(rxPending._ipcBuffer);
// REC: Reset the points in the pending receive context
// since it has been copied into the fragment buffer:
rxPending._ipcBuffer.RdIndex = 0;
rxPending._ipcBuffer.WrIndex = 0;
}
}
// REC: Put the receive context back into the queue so
// that it can be used by subsequent receive operations:
lock (this._rxContextQueue)
{
this._rxContextQueue.Enqueue(rxPending);
}
}
else
{
// REC: A message block wasn't available for us on this
// iteration, so just wait until one is added to the queue:
this._eventRxBuffer.WaitOne();
}
}
}