public TimeWindowQuantiles(IClock clock, ImmutableArray <Quantile> quantiles, Duration maxAge, int ageBuckets)
{
_clock = clock;
_quantiles = quantiles;
_ringBuffer = new CKMSQuantiles[ageBuckets];
for (int i = 0; i < ageBuckets; i++)
{
_ringBuffer[i] = new CKMSQuantiles(quantiles);
}
_currentBucket = 0;
_lastRotateTimestamp = clock.GetCurrentInstant();
_durationBetweenRotates = maxAge / ageBuckets;
}
CKMSQuantiles Rotate()
{
var currentTime = _clock.GetCurrentInstant();
lock (_lock)
{
var timeSinceLastRotate = currentTime - _lastRotateTimestamp;
while (timeSinceLastRotate > _durationBetweenRotates)
{
_ringBuffer[_currentBucket] = new CKMSQuantiles(_quantiles);
if (++_currentBucket >= _ringBuffer.Length)
{
_currentBucket = 0;
}
timeSinceLastRotate -= _durationBetweenRotates;
_lastRotateTimestamp += _durationBetweenRotates;
}
return(_ringBuffer[_currentBucket]);
}
}