private void PreloadStreams()
{
IDictionary <ChannelIdentifier, short[]> output = new Dictionary <ChannelIdentifier, short[]>();
foreach (var s in ActiveOutputStreams.Cast <HekaDAQOutputStream>())
{
s.Reset();
var outputSamples = new List <short>();
while (TimeSpanExtensions.FromSamples((uint)outputSamples.Count(), s.SampleRate).TotalSeconds < PRELOAD_DURATION_SECONDS) // && s.HasMoreData
{
var nextOutputDataForStream = NextOutputDataForStream(s);
var nextSamples = nextOutputDataForStream.DataWithUnits(HekaDAQOutputStream.DAQCountUnits).Data.
Select(
(m) => (short)m.QuantityInBaseUnit);
outputSamples = outputSamples.Concat(nextSamples).ToList();
}
if (!outputSamples.Any())
{
throw new HekaDAQException("Unable to pull data to preload stream " + s.Name);
}
output[new ChannelIdentifier {
ChannelNumber = s.ChannelNumber, ChannelType = (ushort)s.ChannelType
}] =
outputSamples.ToArray();
}
Device.Preload(output);
}
protected override IDictionary <IDAQInputStream, IInputData> ProcessLoopIteration(IDictionary <IDAQOutputStream, IOutputData> outData, TimeSpan deficit)
{
IDictionary <ChannelIdentifier, short[]> output = new Dictionary <ChannelIdentifier, short[]>();
IDictionary <ChannelIdentifier, short[]> deficitOutput = new Dictionary <ChannelIdentifier, short[]>();
foreach (var s in ActiveOutputStreams.Cast <HekaDAQOutputStream>())
{
var outputData = outData[s];
var cons = outputData.DataWithUnits(HekaDAQOutputStream.DAQCountUnits).SplitData(deficit);
short[] outputSamples = cons.Rest.Data.Select((m) => (short)m.QuantityInBaseUnit).ToArray();
short[] deficitOutputSamples = cons.Head.Data.Select((m) => (short)m.QuantityInBaseUnit).ToArray();
output[new ChannelIdentifier {
ChannelNumber = s.ChannelNumber, ChannelType = (ushort)s.ChannelType
}] =
outputSamples;
deficitOutput[new ChannelIdentifier {
ChannelNumber = s.ChannelNumber, ChannelType = (ushort)s.ChannelType
}] =
deficitOutputSamples;
}
if (deficitOutput.Any())
{
Device.Write(deficitOutput);
}
var inputChannels =
ActiveInputStreams.
Cast <HekaDAQInputStream>().
Select((s) => new ChannelIdentifier {
ChannelNumber = s.ChannelNumber, ChannelType = (ushort)s.ChannelType
}).
ToList();
int nsamples;
if (output.Values.Any())
{
if (output.Values.Select(a => a.Length).Distinct().Count() > 1)
{
throw new HekaDAQException("Output buffers are not equal length.");
}
nsamples = output.Values.Select((a) => a.Length).Distinct().First();
}
else
{
nsamples = (int)TimeSpan.FromSeconds(DEFAULT_TRANSFER_BLOCK_SECONDS).Samples(SampleRate);
}
IEnumerable <KeyValuePair <ChannelIdentifier, short[]> > input = Device.ReadWrite(output, inputChannels, nsamples);
var result = new ConcurrentDictionary <IDAQInputStream, IInputData>();
Parallel.ForEach(input, (kvp) =>
{
var s = StreamWithIdentifier(kvp.Key) as IDAQInputStream;
if (s == null)
{
throw new DAQException(
"ChannelIdentifier does not specify an input stream.");
}
//Create the raw input data
IInputData rawData = new InputData(
kvp.Value.Select(
v => new Measurement(v, HekaDAQInputStream.DAQCountUnits)).
ToList(),
StreamWithIdentifier(kvp.Key).SampleRate,
Clock.Now
).DataWithNodeConfiguration("Heka.HekaDAQController", Configuration);
//Convert to input units and store
result[s] = rawData;
});
return(result);
}