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explicit.go
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explicit.go
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package explicit
import (
"sync"
export "go.opentelemetry.io/otel/sdk/export/metric"
"go.opentelemetry.io/otel/sdk/metric/sdkapi"
"go.opentelemetry.io/otel/sdk/metric/aggregator/histogram"
"go.opentelemetry.io/otel/sdk/metric/aggregator/lastvalue"
"go.opentelemetry.io/otel/sdk/metric/aggregator/sum"
)
type (
OptionCache interface {
Store(name string, opts ...histogram.Option)
Fetch(name string) []histogram.Option
}
selectorCache struct {
lock sync.RWMutex
opts map[string][]histogram.Option
}
selectorHistogram struct {
cache OptionCache
}
)
func NewExplicitHistogramDistribution() (export.AggregatorSelector, OptionCache) {
cache := &selectorCache{
opts: make(map[string][]histogram.Option),
}
return selectorHistogram{
cache: cache,
}, cache
}
func (c *selectorCache) Store(name string, opts ...histogram.Option) {
c.lock.Lock()
defer c.lock.Unlock()
c.opts[name] = opts
}
func (c *selectorCache) Fetch(name string) []histogram.Option {
c.lock.RLock()
defer c.lock.RUnlock()
return c.opts[name]
}
func (s selectorHistogram) AggregatorFor(desc *sdkapi.Descriptor, aggPtrs ...*export.Aggregator) {
switch desc.InstrumentKind() {
case sdkapi.GaugeObserverInstrumentKind:
lastValueAggs(aggPtrs)
case sdkapi.HistogramInstrumentKind:
opts := s.cache.Fetch(desc.Name())
aggs := histogram.New(len(aggPtrs), desc, opts...)
for i := range aggPtrs {
*aggPtrs[i] = &aggs[i]
}
default:
sumAggs(aggPtrs)
}
}
func sumAggs(aggPtrs []*export.Aggregator) {
aggs := sum.New(len(aggPtrs))
for i := range aggPtrs {
*aggPtrs[i] = &aggs[i]
}
}
func lastValueAggs(aggPtrs []*export.Aggregator) {
aggs := lastvalue.New(len(aggPtrs))
for i := range aggPtrs {
*aggPtrs[i] = &aggs[i]
}
}