/// <summary>
/// Adds a new recorded value to the sample
/// </summary>
public void Update(long value)
{
var count = _count.IncrementAndGet();
if (count <= _values.Length)
{
var index = (int)count - 1;
Interlocked.Exchange(ref _values[index], value);
}
else
{
var random = Math.Abs(Random.NextLong()) % count;
if (random < _values.Length)
{
var index = (int)random;
Interlocked.Exchange(ref _values[index], value);
}
}
}
private void Update(long value, long timestamp)
{
_lock.EnterReadLock();
try
{
var priority = Weight(timestamp - _startTime) / Random.NextLong();
var newCount = _count.IncrementAndGet();
if (newCount <= _reservoirSize)
{
_values.AddOrUpdate(priority, value, (p, v) => v);
}
else
{
var first = _values.Keys.First();
if (first < priority)
{
_values.AddOrUpdate(priority, value, (p, v) => v);
long removed;
while (!_values.TryRemove(first, out removed))
{
first = _values.Keys.First();
}
}
}
}
finally
{
_lock.ExitReadLock();
}
var now = DateTime.Now.Ticks;
var next = _nextScaleTime.Get();
if (now >= next)
{
Rescale(now, next);
}
}