public bool Equals(RealTimeStreamInfo compare)
{
bool equal =
compare.RequestID == RequestID &&
compare.Datasource == Datasource &&
compare.Instrument.ID == Instrument.ID &&
compare.Frequency == Frequency &&
compare.RTHOnly == RTHOnly;
return equal;
}
public bool Equals(RealTimeStreamInfo compare)
{
bool equal =
compare.RequestID == RequestID &&
compare.Datasource == Datasource &&
compare.Instrument.ID == Instrument.ID &&
compare.Frequency == Frequency &&
compare.RTHOnly == RTHOnly;
return(equal);
}
/// <summary>
/// Sends a real time data request to the correct data source, logs it, and updates subscriber counts
/// </summary>
/// <param name="request"></param>
private void ForwardRTDRequest(RealTimeDataRequest request)
{
//send the request to the correct data source
int reqID;
try
{
reqID = DataSources[request.Instrument.Datasource.Name].RequestRealTimeData(request);
}
catch (Exception ex)
{
Log(LogLevel.Error, "Error requesting real time data: " + ex.Message);
return;
}
//log the request
Log(LogLevel.Info,
string.Format("RTD Request: {0} from {1} @ {2} ID:{3}",
request.Instrument.Symbol,
request.Instrument.Datasource.Name,
Enum.GetName(typeof(BarSize), request.Frequency),
reqID));
//add the request to the active streams, though it's not necessarily active yet
var streamInfo = new RealTimeStreamInfo(
request.Instrument,
reqID,
request.Instrument.Datasource.Name,
request.Frequency,
request.RTHOnly);
lock (_activeStreamsLock)
{
ActiveStreams.TryAdd(streamInfo);
}
lock (_subscriberCountLock)
{
StreamSubscribersCount.Add(streamInfo, 1);
}
}
// Accept a real time data request
private void HandleRTDataRequest(TimeSpan timeout, MemoryStream ms)
{
int receivedBytes;
byte[] buffer = _reqSocket.Receive(null, timeout, out receivedBytes);
if (receivedBytes <= 0) return;
ms.Write(buffer, 0, receivedBytes);
ms.Position = 0;
var request = Serializer.Deserialize<RealTimeDataRequest>(ms);
//with the current approach we can't handle multiple real time data streams from
//the same symbol and data source, but at different frequencies
//if there is already an active stream of this instrument
if (ActiveStreams.Collection.Any(x => x.Instrument.ID == request.Instrument.ID))
{
//Find the KeyValuePair<string, int> from the dictionary that corresponds to this instrument
//The KVP consists of key: request ID, value: data source name
var streamInfo = ActiveStreams.Collection.First(x => x.Instrument.ID == request.Instrument.ID);
//increment the subsriber count
lock (_subscriberCountLock)
{
_streamSubscribersCount[streamInfo]++;
}
//log the request
Application.Current.Dispatcher.InvokeAsync(() => Log(LogLevel.Info,
string.Format("RTD Request for existing stream: {0} from {1} @ {2} ID:{3}",
request.Instrument.Symbol,
request.Instrument.Datasource.Name,
Enum.GetName(typeof(BarSize), request.Frequency),
streamInfo.RequestID)));
//and report success back to the requesting client
_reqSocket.SendMore("SUCCESS", Encoding.UTF8);
//along with the symbol of the instrument
_reqSocket.Send(request.Instrument.Symbol, Encoding.UTF8);
}
else if (DataSources.ContainsKey(request.Instrument.Datasource.Name) && //make sure the datasource is present & connected
DataSources[request.Instrument.Datasource.Name].Connected)
{
//send the request to the correct data source
int reqID = DataSources[request.Instrument.Datasource.Name].RequestRealTimeData(request);
//log the request
Application.Current.Dispatcher.InvokeAsync(() => Log(LogLevel.Info,
string.Format("RTD Request: {0} from {1} @ {2} ID:{3}",
request.Instrument.Symbol,
request.Instrument.Datasource.Name,
Enum.GetName(typeof(BarSize), request.Frequency),
reqID)));
//add the request to the active streams, though it's not necessarily active yet
var streamInfo = new RealTimeStreamInfo(
request.Instrument,
reqID,
request.Instrument.Datasource.Name,
request.Frequency,
request.RTHOnly);
ActiveStreams.TryAdd(streamInfo);
lock (_subscriberCountLock)
{
_streamSubscribersCount.Add(streamInfo, 1);
}
//and report success back to the requesting client
_reqSocket.SendMore("SUCCESS", Encoding.UTF8);
//along with the symbol of the instrument
_reqSocket.Send(request.Instrument.Symbol, Encoding.UTF8);
}
else //no new request was made, send the client the reason why
{
_reqSocket.SendMore("ERROR", Encoding.UTF8);
if (!DataSources.ContainsKey(request.Instrument.Datasource.Name))
{
_reqSocket.Send("No such data source", Encoding.UTF8);
}
else if (!DataSources[request.Instrument.Datasource.Name].Connected)
{
_reqSocket.Send("Data source not connected", Encoding.UTF8);
}
}
}
/// <summary>
/// This method is called when the continuous futures broker returns the results of a request for the "front"
/// contract of a continuous futures instrument.
/// </summary>
private void _cfBroker_FoundFrontContract(object sender, FoundFrontContractEventArgs e)
{
RealTimeDataRequest request;
if (!e.Instrument.ID.HasValue)
{
Log(LogLevel.Error, "CF Broker returned front contract with no ID");
return;
}
Log(LogLevel.Info, string.Format("Front contract received on request ID {0}, is: {1}", e.ID, e.Instrument.Symbol));
//grab the original request
lock (_cfRequestLock)
{
request = _pendingCFRealTimeRequests[e.ID];
_pendingCFRealTimeRequests.Remove(e.ID);
}
//add the contract to the ID map
if (request.Instrument.ID.HasValue &&
!_continuousFuturesIDMap.ContainsKey(request.Instrument.ID.Value))
{
_continuousFuturesIDMap.Add(request.Instrument.ID.Value, e.Instrument.ID.Value);
}
//add the alias
lock (_aliasLock)
{
int contractID = e.Instrument.ID.Value;
if (!_aliases.ContainsKey(contractID))
{
_aliases.Add(contractID, new List <int>());
}
if (request.Instrument.ID.HasValue)
{
_aliases[contractID].Add(request.Instrument.ID.Value);
}
}
//need to check if there's already a stream of the contract....
bool streamExists;
lock (_activeStreamsLock)
{
streamExists = ActiveStreams.Collection.Any(x => x.Instrument.ID == e.Instrument.ID);
}
if (streamExists)
{
//all we need to do in this case is increment the number of subscribers to this stream
IncrementSubscriberCount(e.Instrument);
//log it
Log(LogLevel.Info,
string.Format("RTD Request for CF {0} @ {1} {2}, filled by existing stream of symbol {3}.",
request.Instrument.Symbol,
request.Instrument.Datasource.Name,
Enum.GetName(typeof(BarSize), request.Frequency),
e.Instrument.Symbol));
}
else //no current stream of this contract, add it
{
//make the request
var contractRequest = (RealTimeDataRequest)request.Clone();
contractRequest.Instrument = e.Instrument; //we take the original request, and substitute the CF for the front contract
ForwardRTDRequest(contractRequest);
//add the request to the active streams, though it's not necessarily active yet
var streamInfo = new RealTimeStreamInfo(
request.Instrument,
-1,
request.Instrument.Datasource.Name,
request.Frequency,
request.RTHOnly);
lock (_activeStreamsLock)
{
ActiveStreams.TryAdd(streamInfo);
}
lock (_subscriberCountLock)
{
StreamSubscribersCount.Add(streamInfo, 1);
}
//log it
Log(LogLevel.Info,
string.Format("RTD Request for CF: {0} from {1} @ {2}, filled by contract: {3}",
request.Instrument.Symbol,
request.Instrument.Datasource.Name,
Enum.GetName(typeof(BarSize), request.Frequency),
e.Instrument.Symbol));
}
}