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47 lines
1 KiB
Go
47 lines
1 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
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import (
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"context"
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"slices"
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"sort"
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"time"
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"go.opentelemetry.io/otel/attribute"
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)
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// Histogram returns a [Reservoir] that samples the last measurement that falls
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// within a histogram bucket. The histogram bucket upper-boundaries are define
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// by bounds.
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//
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// The passed bounds will be sorted by this function.
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func Histogram(bounds []float64) Reservoir {
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slices.Sort(bounds)
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return &histRes{
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bounds: bounds,
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storage: newStorage(len(bounds) + 1),
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}
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}
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type histRes struct {
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*storage
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// bounds are bucket bounds in ascending order.
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bounds []float64
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}
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func (r *histRes) Offer(ctx context.Context, t time.Time, v Value, a []attribute.KeyValue) {
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var x float64
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switch v.Type() {
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case Int64ValueType:
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x = float64(v.Int64())
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case Float64ValueType:
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x = v.Float64()
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default:
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panic("unknown value type")
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}
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r.store[sort.SearchFloat64s(r.bounds, x)] = newMeasurement(ctx, t, v, a)
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}
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