private void ComputePlotAverage(out List <DateTime> timePoints, out List <double> retrieveMbPerSecond)
{
timePoints = new List <DateTime>();
retrieveMbPerSecond = new List <double>();
for (int i = 0; i < _component.PerformanceInfo.Count; ++i)
{
DateTime minStartTime = DateTime.MaxValue;
DateTime maxEndTime = DateTime.MinValue;
long totalBytes = 0;
for (int j = 0; j < (int)_plotAverage.Value && i < _component.PerformanceInfo.Count; ++j, ++i)
{
StreamingPerformanceInfo performanceInfo = _component.PerformanceInfo[i];
totalBytes += performanceInfo.TotalBytesTransferred;
if (performanceInfo.StartTime < minStartTime)
{
minStartTime = performanceInfo.StartTime;
}
if (performanceInfo.EndTime > maxEndTime)
{
maxEndTime = performanceInfo.EndTime;
}
}
long averageTicks = minStartTime.Ticks + (maxEndTime.Ticks - minStartTime.Ticks) / 2;
double timeSpanSeconds = maxEndTime.Subtract(minStartTime).TotalSeconds;
double averageMbPerSecond = totalBytes / timeSpanSeconds / 1024 / 1024 * 8;
timePoints.Add(new DateTime(averageTicks));
retrieveMbPerSecond.Add(averageMbPerSecond);
}
}
public void Retrieve()
{
if (!_alreadyRetrieved)
{
//construct this object before the lock so there's no chance of deadlocking
//with the parent data source (because we are accessing it's tags at the
//same time as it's trying to get the pixel data).
FramePixelDataRetriever retriever = new FramePixelDataRetriever(this, Parent.binaryStream, Parent.useBulkLoading);
lock (_syncLock)
{
if (!_alreadyRetrieved)
{
DateTime start = DateTime.Now;
_retrieveResult = retriever.Retrieve();
DateTime end = DateTime.Now;
_lastRetrievePerformanceInfo =
new StreamingPerformanceInfo(start, end, _retrieveResult.MetaData.ContentLength);
_alreadyRetrieved = true;
}
}
}
}
private void OnRetrievedFrame(object frameDataTransferInfo)
{
StreamingPerformanceInfo transferInfo = frameDataTransferInfo as StreamingPerformanceInfo;
if (transferInfo != null)
{
_performanceInfo.Add(transferInfo);
}
NotifyPropertyChanged("NumberOfRetrieveItems");
NotifyPropertyChanged("NumberOfDecompressItems");
}
public void Retrieve()
{
if (!_alreadyRetrieved)
{
//construct this object before the lock so there's no chance of deadlocking
//with the parent data source (because we are accessing it's tags at the
//same time as it's trying to get the pixel data).
FramePixelDataRetriever retriever = new FramePixelDataRetriever(this);
lock (_syncLock)
{
if (!_alreadyRetrieved)
{
AbortAttemptIfNecessary();
try
{
ResetAttemptData();
_retrievesAttempted++;
var start = DateTime.Now;
_retrieveResult = retriever.Retrieve();
var end = DateTime.Now;
_lastRetrievePerformanceInfo =
new StreamingPerformanceInfo(start, end, _retrieveResult.MetaData.ContentLength);
_alreadyRetrieved = true;
}
catch (Exception ex)
{
_lastError = ex;
throw;
}
}
}
}
}
