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