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