/// <summary>
/// Cancel a real time data stream and clean up after it.
/// </summary>
/// <returns>True if the stream was canceled, False if subscribers remain.</returns>
public bool CancelRtdStream(int instrumentID)
{
lock (activeStreamsLock)
{
//make sure there is a data stream for this instrument
if (ActiveStreams.Collection.Any(x => x.Instrument.ID == instrumentID))
{
var streamInfo = ActiveStreams.Collection.First(x => x.Instrument.ID == instrumentID);
var instrument = streamInfo.Instrument;
//log the request
Log(LogLevel.Info,
$"RTD Cancelation request: {instrument.Symbol} from {instrument.Datasource.Name}");
lock (subscriberCountLock)
{
StreamSubscribersCount[streamInfo]--;
if (StreamSubscribersCount[streamInfo] == 0)
{
//there are no clients subscribed to this stream anymore
//cancel it and remove it from all the places
StreamSubscribersCount.Remove(streamInfo);
ActiveStreams.TryRemove(streamInfo);
DataSources[streamInfo.Datasource].CancelRealTimeData(streamInfo.RequestID);
return(true);
}
}
}
return(false);
}
}
/// <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,
$"RTD Request: {request.Instrument.Symbol} from {request.Instrument.Datasource.Name} @ {Enum.GetName(typeof(BarSize), request.Frequency)} ID:{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);
}
}
