/// <summary>
/// Fills the index & byte buffers with new data from the database.
/// </summary>
public void Populate(long newStartingTicks)
{
populating = true;
// Use a lock to prevent overwriting startingTick during an override operation
lock ( populatingLockObj )
{
#if TIMING
long startTimer = DateTime.Now.Ticks;
#endif
// Try to avoid expensive database operatons (both of them)
if (populateOverride) // RETURN and leave populate as true
{
return;
}
// load the indexes from the database
streamOutOfData = DBHelper.LoadIndices(indices, newStartingTicks, streamID, buffer.Buffer.Length, out indexCount);
currentIndex = 0;
// if there are indicies, load the raw byte data for them
if (indexCount > 0)
{
// Try to avoid expensive database operatons
if (populateOverride) // RETURN and leave populate as true
{
return;
}
this.startingTick = indices[0].timestamp;
this.endingTick = indices[indexCount - 1].timestamp;
DBHelper.LoadBuffer(streamID, indices[0].start, indices[indexCount - 1].end, ref buffer);
Trace.WriteLine(String.Format(CultureInfo.InvariantCulture,
"Loaded buffer (ID: {0}) with: {1} sec, {2} bytes, {3} frames",
streamID, ((double)(endingTick - startingTick) / 10000000.0),
(indices[indexCount - 1].end - indices[0].start + 1), indexCount));
}
else
{
// Populate these two variables with some meaningful data
this.startingTick = newStartingTicks;
this.endingTick = newStartingTicks;
}
#if TIMING
long takenTime = DateTime.Now.Ticks - startTimer;
Trace.WriteLine(string.Format(CultureInfo.InvariantCulture, "TIMING: Load buffer took {0} ms",
(takenTime / Constants.TicksPerMs)));
#endif
populating = false;
}
}