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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
import (
"context"
"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[N int64 | float64](bounds []float64) Reservoir[N] {
sort.Float64s(bounds)
return &histRes[N]{
bounds: bounds,
storage: newStorage[N](len(bounds) + 1),
}
}
type histRes[N int64 | float64] struct {
*storage[N]
// bounds are bucket bounds in ascending order.
bounds []float64
}
func (r *histRes[N]) Offer(ctx context.Context, t time.Time, n N, a []attribute.KeyValue) {
r.store[sort.SearchFloat64s(r.bounds, float64(n))] = newMeasurement(ctx, t, n, a)
}
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