/// <summary>
/// /// Creates a new ExponentiallyDecayingReservoir
/// </summary>
/// <param name="size">The number of samples to keep in the sampling reservoir</param>
/// <param name="alpha">The exponential decay factor; the higher this is, the more biased the sample will be towards newer values</param>
/// <param name="clock">the clock used to timestamp samples and track rescaling</param>
public ExponentiallyDecayingReservoir(int size, double alpha, Clock clock)
{
_values = new ConcurrentDictionary<double, WeightedSample>();
_lock = new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion);
_alpha = alpha;
_size = size;
this.clock = clock;
this._count = new AtomicLong(0);
this._startTime = CurrentTimeInSeconds();
this._nextScaleTime = new AtomicLong(clock.getTick() + RESCALE_THRESHOLD);
}
/// <summary>
/// Creates a new <see cref="Meter"/>
/// </summary>
/// <param name="clock">the clock to use for the meter ticks</param>
public Meter(Clock clock)
{
this.clock = clock;
this._startTime = this.clock.getTick();
this._lastTick = new AtomicLong(_startTime);
}
public Counter()
{
_count = new AtomicLong(0);
}
/// <summary>
/// Creates a new <see cref="Histogram" /> with the given sample type
/// </summary>
/// <param name="reservoir">the reservoir to create a histogram from</param>
public Histogram(Reservoir reservoir)
{
this.reservoir = reservoir;
this.count = new AtomicLong(0);
}