private void DataThread()
{
const int N_States = 10;
var blockTotal = _reader.SampleCount / _buffer.Length;
var stateSaveFactor = blockTotal / N_States;
var totalRead = 0L;
// find last state from bag
var nearestState = GetNearestState(_fileTargetPosition);
if (nearestState != null)
{
var nearestStateDistance = _fileTargetPosition - nearestState.Position;
var currentDistance = _fileTargetPosition - _reader.Position;
if (currentDistance < 0 || currentDistance > nearestStateDistance)
{
Parent.LoadState(nearestState.States);
System.Diagnostics.Debug.WriteLine("Load state from position " + nearestState.Position);
if (_seekWindow != null)
{
_seekWindow.ValueBackground = _reader.Position;
}
}
}
var newStateRefPos = _reader.Position;
if (_stateBag.Count > 0 && _stateBag.Last().Position < newStateRefPos)
{
newStateRefPos = _stateBag.Last().Position;
}
// current block in file
totalRead = _reader.Position;
while (_running)
{
if (_fileTargetPosition > _reader.Position)
{
// save state
//if (totalRead % (stateSaveFactor * _buffer.Length) == 0) {
if ((_reader.Position - newStateRefPos) > (stateSaveFactor * _buffer.Length))
{
if (!_stateBag.Exists(t => t.Item1 == _reader.Position))
{
_seekWindow?.AddStatePointMarker(_reader.Position);
var states = Parent.SaveState();
_stateBag.Add(new StateEntry(_reader.Position, states));
newStateRefPos = _reader.Position;
System.Diagnostics.Debug.WriteLine("Added to statebag: " + _reader.Position);
}
}
// push data into graph
var continueReading = true;
try {
var shouldRead = Math.Min(_buffer.Length, _fileTargetPosition - _reader.Position);
totalRead += FillBuffer(shouldRead);
} catch (IOException) {
continueReading = false;
}
DistributeBuffer();
if (!continueReading)
{
NodeSystemSettings.Instance.SystemHost.StopProcessing();
return;
}
}
else
{
break;
}
}
}
