/// <summary>
/// The HandleIpcDispatch_EventOpened event handler is invoked in
/// response to a new session being established between a peer
/// system and the endpoint associated with the service.
/// </summary>
/// <param name="sender">
/// The IPC endpoint that dispatched the event.
/// </param>
/// <param name="args">
/// The details of the event being dispatched.
/// </param>
private void HandleIpcDispatch_EventOpened(object sender, VfxIpcEventArgs args)
{
// REC: Create a new instance of a FIX session to handle
// the communication between the server and the peer:
IVfxFixSession fixSession = null;
// REC: Retrieve the version definition from the version
// definition registry and determine what kind of session
// needs to be created in order to handle the connection:
IVfxFixVxRegistry vxRegistry = this._localServices.GetService(typeof(IVfxFixVxRegistry)) as IVfxFixVxRegistry;
// REC: Check the version definition in order to tell if
// this is a FIX 4.x or FIX 5.x service:
VfxFixVxRecord vxRecord = vxRegistry.Get(this._sxVersion);
if (vxRecord.Layer.ToLower().CompareTo("combined") == 0)
{
fixSession = new VfxFix4xServerSession();
}
else
{
fixSession = new VfxFix5xServerSession();
}
// REC: Initialize the session:
fixSession.Init(_localServices, this);
// REC: Create an entry for the session in the
// local session map:
_mapFixSessions.Add(fixSession.InstanceId, fixSession);
// REC: Bind the FIX session to the IPC session:
_mapFixToIpc.Add(fixSession.InstanceId, args.Token);
// REC: Bind the IPC session to the FIX session:
_mapIpcToFix.Add(args.Token, fixSession.InstanceId);
// REC: Create the application session container
// that will be passed to the app implementation
// when events are generated on the session:
VfxFixServerSession appSession = new VfxFixServerSession(fixSession);
// REC: Create a binding between the FIX session
// and the application session so that events from
// the FIX session can be correlated to the correct
// application session when events are dispatched to
// the user's FIX application instance:
_mapAppSessions.Add(fixSession.InstanceId, appSession);
// REC: Inform the session that a peer system
// has been connected to it:
fixSession.HandleConnect();
}
/// <summary>
/// The HandleDispatch event handler is invoked in response
/// to an IPC event being dispatched to the session by the
/// session's associated IPC module. The session assigns its
/// unique identifier to the event and then forwards the event
/// up to the server endpoint that owns the session.
/// </summary>
/// <param name="sender">
/// The IPC module that is dispatching the event.
/// </param>
/// <param name="args">
/// The details of the event being dispatched.
/// </param>
private void HandleDispatch(object sender, VfxIpcEventArgs args)
{
args.Token = _instanceGuid.ToString();
EventHandler<VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
tmp(this, args);
}
}
/// <summary>
/// The HandleIpcDispatch_EventClosed event handler is invoked
/// when an IPC session disconnects from a peer system.
/// </summary>
/// <param name="sender">
/// The IPC session that dispatched the event.
/// </param>
/// <param name="args">
/// The details of the event being dispatched.
/// </param>
private void HandleIpcDispatch_EventClosed(object sender, VfxIpcEventArgs args)
{
// REC: Determine if there is currently an instance of
// a FIX session associated with the IPC session:
if (_mapIpcToFix.ContainsKey(args.Token))
{
// REC: Remove the binding between the FIX session
// and the IPC session, since the IPC session has been
// disconnected and can not be used by the FIX session
// for any other operations:
if (_mapFixToIpc.ContainsKey(_mapIpcToFix[args.Token]))
{
_mapFixToIpc.Remove(_mapIpcToFix[args.Token]);
}
// REC: Notify the associated FIX session that the
// connection has been broken:
_mapFixSessions[_mapIpcToFix[args.Token]].HandleDisconnect();
}
}
private void HandleIpcDispatch_EventMessage(object sender, VfxIpcEventArgs args)
{
if (_mapIpcToFix.ContainsKey(args.Token))
{
_mapFixSessions[_mapIpcToFix[args.Token]].HandleRxMessage(args.EventData);
}
}
/// <summary>
/// The HandleTcpConnector_Success event handler is invoked
/// in response to the tcp connector establishing a connection
/// to the peer system.
/// </summary>
/// <param name="sender">
/// The connector that is dispatching the event.
/// </param>
/// <param name="args">
/// The event details that are associated with the event.
/// </param>
private void HandleTcpConnector_Success(object sender, VfxTcpConnectorEventArgs args)
{
// REC: Translate the connector's success notification
// into the corresponding IPC event and dispatch it:
EventHandler<VfxIpcEventArgs> tmpDispatch = EventDispatch;
if (tmpDispatch != null)
{
VfxIpcEventArgs tmpArgs = new VfxIpcEventArgs(VfxIpcEventTypes.Event_Connect_Success);
tmpDispatch(this, tmpArgs);
}
}
/// <summary>
/// The HandleIpcDispatch event handler is invoked in response to
/// an IPC session raising an event. The server service examines
/// the token/sessionId that is contained in the event arguments
/// and uses that information to demultiplex the details of the
/// event to the corresponding FIX session.
/// </summary>
/// <param name="sender">
/// The endpoint session that generated the event.
/// </param>
/// <param name="args">
/// The details of the event that was generated.
/// </param>
private void HandleIpcDispatch(object sender, VfxIpcEventArgs args)
{
switch (args.EventType)
{
case VfxIpcEventTypes.Event_Session_Opened:
HandleIpcDispatch_EventOpened(sender, args);
break;
case VfxIpcEventTypes.Event_Session_Closed:
HandleIpcDispatch_EventClosed(sender, args);
break;
case VfxIpcEventTypes.Event_Session_Message:
HandleIpcDispatch_EventMessage(sender, args);
break;
default:
break;
}
}
/// <summary>
/// The HandleDispatch event handler is invoked in response to
/// one of the IPC sessions dispatching an event to the endpoint.
/// </summary>
/// <param name="sender">
/// The IPC session that is dispatching the event.
/// </param>
/// <param name="args">
/// The details of the event being dispatched. The Token property
/// of the event args instance will be set to the session id of the
/// session that generated the event so that subscribers know which
/// of the endpoint's sessions the event originated from.
/// </param>
private void HandleDispatch(object sender, VfxIpcEventArgs args)
{
EventHandler<VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
tmp(this, args);
}
}
/// <summary>
/// The HandleIpc_Dispatch method is invoked in response
/// to the IPC session handler dispatching an IPC event to
/// the endpoint. The event is simply forwarded to the owner
/// of the endpoint instance for processing.
/// </summary>
/// <param name="sender">
/// The IPC session that is dispatching the event.
/// </param>
/// <param name="args">
/// The details of the IPC event being dispatched.
/// </param>
private void HandleIpc_Dispatch(object sender, VfxIpcEventArgs args)
{
// REC: The incoming event from the underlying IPC session
// is simply forwarded to the endpoint's owner:
EventHandler<VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
tmp(this, args);
}
}
/// <summary>
/// The CompleteRecv method is invoked in response to
/// an asynchronous receive operation completing.
/// </summary>
/// <param name="ar"></param>
private void CompleteRecv(IAsyncResult ar)
{
// REC: Retrieve the IO context that is associated with the
// original asynchronous receive operation.
IoContext rxContext = ar.AsyncState as IoContext;
if (rxContext != null)
{
try
{
// REC: Get the total number of bytes that were read
// from the peer system by this operation:
int rxBytes = rxContext._ipcSocket.EndReceive(ar);
if (rxBytes > 0)
{
// REC: Adjust the write index in the message block:
rxContext._ipcBuffer.WrIndex = rxContext._ipcBuffer.WrIndex + rxBytes;
// REC: Offload the received data onto a separate thread:
if (this._rxBuffering == true)
{
Socket rxSocket = rxContext._ipcSocket;
lock (this._synchRxPendingQueue)
{
// REC: Push the received data onto the queue so that
// it can be picked up by the secondary receive thread
// for further processing:
this._rxPendingQueue.Enqueue(rxContext);
// REC: If the queue was empty prior to this context
// being added to it, we need to signal the secondary
// receive thread so that it can start processing the
// data again:
if (this._rxPendingQueue.Count == 1)
{
this._eventRxBuffer.Set();
}
}
// REC: Attempt to pull another context from the context
// queue so that we can receive more data:
IoContext rxNext;
if (this._rxContextQueue.Count > 0)
{
rxNext = this._rxContextQueue.Dequeue();
}
else
{
// REC: Note that this is BAD and will result in the
// exhaustion of all the system's memory if there is a
// continuous problem with the speed at which messages
// are being consumed on the receive thread...
rxNext = new IoContext(rxSocket, new VfxMsgBlock(8192));
}
// REC: Initiate a new receive operation, using the next
// available receive context:
InitiateRecv(rxNext);
}
else
{
// REC: If receive buffering has not been enabled then the
// data is dispatched directly to the module's owner:
EventHandler <VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
tmp(this, new VfxIpcEventArgs(rxContext._ipcBuffer));
// REC: Adjust the buffer to take into consideration
// any data that was read by the module's owner:
rxContext._ipcBuffer.Crunch();
// REC: Initiate another receive operation using the
// same receive buffer that was just processed:
InitiateRecv(rxContext);
}
}
}
else
{
_moduleState = ModuleStates.Module_State_Shutdown;
// REC: This might happen as the result of the
// user closing the session down.
EventHandler <VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
VfxIpcEventArgs dxArgs = new VfxIpcEventArgs(VfxIpcEventTypes.Event_Session_Closed);
tmp(this, dxArgs);
}
}
}
catch (SocketException)
{
_moduleState = ModuleStates.Module_State_Shutdown;
// REC: This might happen as the result of the
// user closing the session down.
EventHandler <VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
VfxIpcEventArgs dxArgs = new VfxIpcEventArgs(VfxIpcEventTypes.Event_Session_Closed);
tmp(this, dxArgs);
}
}
catch (ObjectDisposedException)
{
_moduleState = ModuleStates.Module_State_Shutdown;
// REC: This happens if the socket gets closed
// locally rather than being closed by the peer.
EventHandler <VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
VfxIpcEventArgs dxArgs = new VfxIpcEventArgs(VfxIpcEventTypes.Event_Session_Closed);
tmp(this, dxArgs);
}
}
}
}
/// <summary>
/// The HandleIpc_EventOpened method is invoked in response
/// to the IPC endpoint establishing a connection to the peer
/// system that the service is interacting with.
/// </summary>
/// <param name="sender">
/// The VfxIpcEndpoint that dispatched the event.
/// </param>
/// <param name="args">
/// The details associated with the event.
/// </param>
private void HandleIpc_EventOpened(object sender, VfxIpcEventArgs args)
{
lock (_synch)
{
// REC: The IPC session is now established.
_ipcEstablished = true;
// REC: Adjust the service's current status:
_serviceStatus = VfxFixServiceStatus.Service_Status_Opened;
// REC: Dispatch the update to the service's subscribers:
EventHandler<VfxFixServiceEventArgs> tmpDispatch_Update = EventDispatch;
if (tmpDispatch_Update != null)
{
VfxFixServiceEventArgs tmpArgs = new VfxFixServiceEventArgs(VfxFixServiceEventTypes.Event_Service_Updated, _serviceStatus);
tmpDispatch_Update(this, tmpArgs);
}
// REC: Retrieve the version definition from the version
// definition registry and determine what kind of session
// needs to be created in order to handle the connection:
IVfxFixVxRegistry vxRegistry = this._localServices.GetService(typeof(IVfxFixVxRegistry)) as IVfxFixVxRegistry;
// REC: Create a new instance of a FIX session to handle
// the communication between the server and the peer:
IVfxFixSession fixSession = null;
// REC: Check the version definition in order to tell if
// this is a FIX 4.x or FIX 5.x service:
VfxFixVxRecord vxRecord = vxRegistry.Get(this._sxVersion);
if (vxRecord.Layer.ToLower().CompareTo("combined") == 0)
{
fixSession = new VfxFix4xClientSession();
}
else
{
fixSession = new VfxFix5xClientSession();
}
_fixSession = fixSession;
// REC: Initialize the session:
_fixSession.Init(this._localServices, this);
// REC: Construct an instance of the session wrapper
// for the FIX application and bind it to the session
// implementation that has been created:
_appSession = new VfxFixClientSession(_fixSession);
// REC: Notify the FIX session implementation that it
// has been connected to a peer system:
_fixSession.HandleConnect();
}
}
/// <summary>
/// The HandleIpc_EventMessage event handler is invoked in
/// response to the service being notified that the IPC session
/// has received some data from the peer system.
/// </summary>
/// <param name="sender">
/// The IPC session that is dispatching the event.
/// </param>
/// <param name="args">
/// The details of the IPC event being dispatched.
/// </param>
private void HandleIpc_EventMessage(object sender, VfxIpcEventArgs args)
{
lock (_synch)
{
_fixSession.HandleRxMessage(args.EventData);
}
}
/// <summary>
/// The HandleIpc_EventClosed event handler is invoked in
/// response to the service being notified that the session
/// has been disconnected from the peer system.
/// </summary>
/// <param name="sender">
/// The IPC session that is dispatching the event.
/// </param>
/// <param name="args">
/// The details of the IPC event being dispatched.
/// </param>
private void HandleIpc_EventClosed(object sender, VfxIpcEventArgs args)
{
lock (_synch)
{
// REC: The IPC session is no longer established:
_ipcEstablished = false;
// REC: Notify the FIX session that the peer system
// is no longer connected:
_fixSession.HandleDisconnect();
// REC: Adjust the service's current status:
_serviceStatus = VfxFixServiceStatus.Service_Status_Disconnected;
EventHandler<VfxFixServiceEventArgs> tmpDispatch_Update = EventDispatch;
if (tmpDispatch_Update != null)
{
VfxFixServiceEventArgs tmpArgs = new VfxFixServiceEventArgs(VfxFixServiceEventTypes.Event_Service_Updated, _serviceStatus);
tmpDispatch_Update(this, tmpArgs);
}
// REC: If the service is closing, then the disconnection
// of the IPC endpoint is the last thing that needs to be
// completed before dispatching the stopped event back up
// to the service's owner/subscribers:
if (_serviceState == VfxFixServiceStates.Service_State_Closing)
{
// REC: Adjust the service's current state:
_serviceState = VfxFixServiceStates.Service_State_Closed;
// REC: Adjust the service's current status:
_serviceStatus = VfxFixServiceStatus.Service_Status_Closed;
EventHandler<VfxFixServiceEventArgs> tmpDispatch_Stopped = EventDispatch;
if (tmpDispatch_Stopped != null)
{
VfxFixServiceEventArgs tmpArgs = new VfxFixServiceEventArgs(VfxFixServiceEventTypes.Event_Service_Stopped, _serviceStatus);
tmpDispatch_Stopped(this, tmpArgs);
}
}
else
{
// REC: If the service is not configured to reconnect
// to the peer system, then it is now stopped:
// NOTE: Add reconnect logic here!
// REC: Adjust the service's current state:
_serviceState = VfxFixServiceStates.Service_State_Closed;
// REC: Adjust the service's current status:
_serviceStatus = VfxFixServiceStatus.Service_Status_Closed;
EventHandler<VfxFixServiceEventArgs> tmpDispatch_Stopped = EventDispatch;
if (tmpDispatch_Stopped != null)
{
VfxFixServiceEventArgs tmpArgs = new VfxFixServiceEventArgs(VfxFixServiceEventTypes.Event_Service_Stopped, _serviceStatus);
tmpDispatch_Stopped(this, tmpArgs);
}
}
}
}
/// <summary>
/// The CompleteRecv method is invoked in response to
/// an asynchronous receive operation completing.
/// </summary>
/// <param name="ar"></param>
private void CompleteRecv(IAsyncResult ar)
{
// REC: Retrieve the IO context that is associated with the
// original asynchronous receive operation.
IoContext rxContext = ar.AsyncState as IoContext;
if (rxContext != null)
{
try
{
// REC: Get the total number of bytes that were read
// from the peer system by this operation:
int rxBytes = rxContext._ipcSocket.EndReceive(ar);
if (rxBytes > 0)
{
// REC: Adjust the write index in the message block:
rxContext._ipcBuffer.WrIndex = rxContext._ipcBuffer.WrIndex + rxBytes;
// REC: Offload the received data onto a separate thread:
if (this._rxBuffering == true)
{
Socket rxSocket = rxContext._ipcSocket;
lock (this._synchRxPendingQueue)
{
// REC: Push the received data onto the queue so that
// it can be picked up by the secondary receive thread
// for further processing:
this._rxPendingQueue.Enqueue(rxContext);
// REC: If the queue was empty prior to this context
// being added to it, we need to signal the secondary
// receive thread so that it can start processing the
// data again:
if (this._rxPendingQueue.Count == 1)
{
this._eventRxBuffer.Set();
}
}
// REC: Attempt to pull another context from the context
// queue so that we can receive more data:
IoContext rxNext;
if (this._rxContextQueue.Count > 0)
{
rxNext = this._rxContextQueue.Dequeue();
}
else
{
// REC: Note that this is BAD and will result in the
// exhaustion of all the system's memory if there is a
// continuous problem with the speed at which messages
// are being consumed on the receive thread...
rxNext = new IoContext(rxSocket, new VfxMsgBlock(8192));
}
// REC: Initiate a new receive operation, using the next
// available receive context:
InitiateRecv(rxNext);
}
else
{
// REC: If receive buffering has not been enabled then the
// data is dispatched directly to the module's owner:
EventHandler<VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
tmp(this, new VfxIpcEventArgs(rxContext._ipcBuffer));
// REC: Adjust the buffer to take into consideration
// any data that was read by the module's owner:
rxContext._ipcBuffer.Crunch();
// REC: Initiate another receive operation using the
// same receive buffer that was just processed:
InitiateRecv(rxContext);
}
}
}
else
{
_moduleState = ModuleStates.Module_State_Shutdown;
// REC: This might happen as the result of the
// user closing the session down.
EventHandler<VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
VfxIpcEventArgs dxArgs = new VfxIpcEventArgs(VfxIpcEventTypes.Event_Session_Closed);
tmp(this, dxArgs);
}
}
}
catch (SocketException)
{
_moduleState = ModuleStates.Module_State_Shutdown;
// REC: This might happen as the result of the
// user closing the session down.
EventHandler<VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
VfxIpcEventArgs dxArgs = new VfxIpcEventArgs(VfxIpcEventTypes.Event_Session_Closed);
tmp(this, dxArgs);
}
}
catch (ObjectDisposedException)
{
_moduleState = ModuleStates.Module_State_Shutdown;
// REC: This happens if the socket gets closed
// locally rather than being closed by the peer.
EventHandler<VfxIpcEventArgs> tmp = EventDispatch;
if (tmp != null)
{
VfxIpcEventArgs dxArgs = new VfxIpcEventArgs(VfxIpcEventTypes.Event_Session_Closed);
tmp(this, dxArgs);
}
}
}
}
