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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package aggregate // import "go.opentelemetry.io/otel/sdk/metric/internal/aggregate"
import (
"sync"
"go.opentelemetry.io/otel/sdk/metric/exemplar"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
)
var exemplarPool = sync.Pool{
New: func() any { return new([]exemplar.Exemplar) },
}
func collectExemplars[N int64 | float64](out *[]metricdata.Exemplar[N], f func(*[]exemplar.Exemplar)) {
dest := exemplarPool.Get().(*[]exemplar.Exemplar)
defer func() {
clear(*dest) // Erase elements to let GC collect objects.
*dest = (*dest)[:0]
exemplarPool.Put(dest)
}()
*dest = reset(*dest, len(*out), cap(*out))
f(dest)
*out = reset(*out, len(*dest), cap(*dest))
for i, e := range *dest {
(*out)[i].FilteredAttributes = e.FilteredAttributes
(*out)[i].Time = e.Time
(*out)[i].SpanID = e.SpanID
(*out)[i].TraceID = e.TraceID
switch e.Value.Type() {
case exemplar.Int64ValueType:
(*out)[i].Value = N(e.Value.Int64())
case exemplar.Float64ValueType:
(*out)[i].Value = N(e.Value.Float64())
}
}
}
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