/
exporter.go
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/
exporter.go
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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 stdoutmetric // import "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
import (
"context"
"sync"
"sync/atomic"
"go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/metric/aggregation"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
)
// exporter is an OpenTelemetry metric exporter.
type exporter struct {
encVal atomic.Value // encoderHolder
shutdownOnce sync.Once
temporalitySelector metric.TemporalitySelector
aggregationSelector metric.AggregationSelector
}
// New returns a configured metric exporter.
//
// If no options are passed, the default exporter returned will use a JSON
// encoder with tab indentations that output to STDOUT.
func New(options ...Option) (metric.Exporter, error) {
cfg := newConfig(options...)
exp := &exporter{
temporalitySelector: cfg.temporalitySelector,
aggregationSelector: cfg.aggregationSelector,
}
exp.encVal.Store(*cfg.encoder)
return exp, nil
}
func (e *exporter) Temporality(k metric.InstrumentKind) metricdata.Temporality {
return e.temporalitySelector(k)
}
func (e *exporter) Aggregation(k metric.InstrumentKind) aggregation.Aggregation {
return e.aggregationSelector(k)
}
func (e *exporter) Export(ctx context.Context, data metricdata.ResourceMetrics) error {
select {
case <-ctx.Done():
// Don't do anything if the context has already timed out.
return ctx.Err()
default:
// Context is still valid, continue.
}
return e.encVal.Load().(encoderHolder).Encode(data)
}
func (e *exporter) ForceFlush(ctx context.Context) error {
// exporter holds no state, nothing to flush.
return ctx.Err()
}
func (e *exporter) Shutdown(ctx context.Context) error {
e.shutdownOnce.Do(func() {
e.encVal.Store(encoderHolder{
encoder: shutdownEncoder{},
})
})
return ctx.Err()
}