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Allow SampleRescaleThreshold to be configured from userspace #142

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Allow SampleRescaleThreshold to be configured from userspace #142

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8 changes: 4 additions & 4 deletions sample.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ import (
"time"
)

const rescaleThreshold = time.Hour
var SampleRescaleThreshold = time.Hour

// Samples maintain a statistically-significant selection of values from
// a stream.
Expand Down Expand Up @@ -55,7 +55,7 @@ func NewExpDecaySample(reservoirSize int, alpha float64) Sample {
t0: time.Now(),
values: newExpDecaySampleHeap(reservoirSize),
}
s.t1 = s.t0.Add(rescaleThreshold)
s.t1 = s.t0.Add(SampleRescaleThreshold)
return s
}

Expand All @@ -65,7 +65,7 @@ func (s *ExpDecaySample) Clear() {
defer s.mutex.Unlock()
s.count = 0
s.t0 = time.Now()
s.t1 = s.t0.Add(rescaleThreshold)
s.t1 = s.t0.Add(SampleRescaleThreshold)
s.values.Clear()
}

Expand Down Expand Up @@ -177,7 +177,7 @@ func (s *ExpDecaySample) update(t time.Time, v int64) {
t0 := s.t0
s.values.Clear()
s.t0 = t
s.t1 = s.t0.Add(rescaleThreshold)
s.t1 = s.t0.Add(SampleRescaleThreshold)
for _, v := range values {
v.k = v.k * math.Exp(-s.alpha*s.t0.Sub(t0).Seconds())
s.values.Push(v)
Expand Down