private void PerformIntervalSample()
{
inactiveHistogram.reset();
try
{
recordingPhaser.ReaderLock();
// Swap active and inactive histograms:
var tempHistogram = inactiveHistogram;
inactiveHistogram = activeHistogram;
activeHistogram = tempHistogram;
// Mark end time of previous interval and start time of new one:
var now = CurentTimeInMilis();
activeHistogram.setStartTimeStamp(now);
inactiveHistogram.setEndTimeStamp(now);
// Make sure we are not in the middle of recording a value on the previously active histogram:
// Flip phase to make sure no recordings that were in flight pre-flip are still active:
recordingPhaser.FlipPhase(500000L /* yield in 0.5 msec units if needed */);
}
finally
{
recordingPhaser.ReaderUnlock();
}
}
/// <summary>
/// Construct an auto-resizing Recorder with a lowest discernible value of
/// 1 and an auto-adjusting highestTrackableValue. Can auto-resize up to track values up to (long.MaxValue / 2).
/// </summary>
/// <param name="numberOfSignificantValueDigits">
/// Specifies the precision to use. This is the number of significant decimal
/// digits to which the histogram will maintain value resolution and separation. Must be a non-negative integer between
/// 0 and 5.
/// </param>
public Recorder(int numberOfSignificantValueDigits)
{
activeHistogram = new InternalConcurrentHistogram(instanceId, numberOfSignificantValueDigits);
inactiveHistogram = new InternalConcurrentHistogram(instanceId, numberOfSignificantValueDigits);
activeHistogram.setStartTimeStamp(CurentTimeInMilis());
}
