/// <summary>
/// Initializes a new instance of the <see cref="DefaultForwardDecayingReservoir" /> class.
/// </summary>
/// <param name="sampleSize">The number of samples to keep in the sampling reservoir</param>
/// <param name="alpha">
/// The alpha value, e.g 0.015 will heavily biases the reservoir to the past 5 mins of measurements. The higher the
/// value the more biased the reservoir will be towards newer values.
/// </param>
/// <param name="clock">The <see cref="IClock">clock</see> type to use for calculating processing time.</param>
// ReSharper disable MemberCanBePrivate.Global
public DefaultForwardDecayingReservoir(int sampleSize, double alpha, IClock clock)
// ReSharper restore MemberCanBePrivate.Global
{
_sampleSize = sampleSize;
_alpha = alpha;
_clock = clock;
_values = new SortedList <double, WeightedSample>(sampleSize, ReverseOrderDoubleComparer.Instance);
_startTime = new AtomicLong(clock.Seconds);
_rescaleScheduler = DefaultReservoirRescaleScheduler.Instance;
_rescaleScheduler.ScheduleReScaling(this);
}
public ForwardDecayingLowWeightThresholdReservoir(
int sampleSize,
double alpha,
double sampleWeightThreshold,
IClock clock,
IReservoirRescaleScheduler rescaleScheduler)
{
sampleSize_ = sampleSize;
alpha_ = alpha;
sampleWeightThreshold_ = sampleWeightThreshold;
clock_ = clock;
rescaleScheduler_ = rescaleScheduler;
values_ = new SortedList <double, WeightedSample>(sampleSize, ReverseOrderDoubleComparer.Instance);
startTime_ = clock.Seconds;
rescaleScheduler_.ScheduleReScaling(this);
}
/// <inheritdoc />
public IMetricsBuilder ForwardDecaying(int sampleSize, double alpha, double minimumSampleWeight, IClock clock, IReservoirRescaleScheduler rescaleScheduler)
{
Reservoir(() => new DefaultForwardDecayingReservoir(sampleSize, alpha, minimumSampleWeight, clock, rescaleScheduler));
return(Builder);
}
public ExponentiallyDecayingReservoirTests()
{
_clock = new TestClock();
_scheduler = new TestReservoirRescaleScheduler(_clock);
}
