mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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94 lines
2.9 KiB
Go
94 lines
2.9 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 simple // import "go.opentelemetry.io/otel/sdk/metric/selector/simple"
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import (
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"go.opentelemetry.io/otel/metric/sdkapi"
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"go.opentelemetry.io/otel/sdk/metric/aggregator/histogram"
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"go.opentelemetry.io/otel/sdk/metric/aggregator/lastvalue"
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"go.opentelemetry.io/otel/sdk/metric/aggregator/sum"
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"go.opentelemetry.io/otel/sdk/metric/export"
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)
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type (
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selectorInexpensive struct{}
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selectorHistogram struct {
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options []histogram.Option
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}
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)
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var (
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_ export.AggregatorSelector = selectorInexpensive{}
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_ export.AggregatorSelector = selectorHistogram{}
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)
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// NewWithInexpensiveDistribution returns a simple aggregator selector
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// that uses minmaxsumcount aggregators for `Histogram`
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// instruments. This selector is faster and uses less memory than the
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// others in this package because minmaxsumcount aggregators maintain
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// the least information about the distribution among these choices.
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func NewWithInexpensiveDistribution() export.AggregatorSelector {
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return selectorInexpensive{}
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}
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// NewWithHistogramDistribution returns a simple aggregator selector
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// that uses histogram aggregators for `Histogram` instruments.
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// This selector is a good default choice for most metric exporters.
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func NewWithHistogramDistribution(options ...histogram.Option) export.AggregatorSelector {
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return selectorHistogram{options: options}
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}
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func sumAggs(aggPtrs []*export.Aggregator) {
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aggs := sum.New(len(aggPtrs))
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for i := range aggPtrs {
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*aggPtrs[i] = &aggs[i]
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}
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}
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func lastValueAggs(aggPtrs []*export.Aggregator) {
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aggs := lastvalue.New(len(aggPtrs))
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for i := range aggPtrs {
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*aggPtrs[i] = &aggs[i]
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}
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}
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func (selectorInexpensive) AggregatorFor(descriptor *sdkapi.Descriptor, aggPtrs ...*export.Aggregator) {
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switch descriptor.InstrumentKind() {
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case sdkapi.GaugeObserverInstrumentKind:
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lastValueAggs(aggPtrs)
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case sdkapi.HistogramInstrumentKind:
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aggs := sum.New(len(aggPtrs))
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for i := range aggPtrs {
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*aggPtrs[i] = &aggs[i]
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}
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default:
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sumAggs(aggPtrs)
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}
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}
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func (s selectorHistogram) AggregatorFor(descriptor *sdkapi.Descriptor, aggPtrs ...*export.Aggregator) {
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switch descriptor.InstrumentKind() {
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case sdkapi.GaugeObserverInstrumentKind:
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lastValueAggs(aggPtrs)
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case sdkapi.HistogramInstrumentKind:
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aggs := histogram.New(len(aggPtrs), descriptor, s.options...)
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for i := range aggPtrs {
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*aggPtrs[i] = &aggs[i]
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}
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default:
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sumAggs(aggPtrs)
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}
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}
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