forked from mirrors/gotosocial
69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
|
// 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
|
||
|
|
//
|
||
|
|
// htmp://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 global // import "go.opentelemetry.io/otel/metric/internal/global"
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"sync"
|
||
|
|
"sync/atomic"
|
||
|
|
|
||
|
|
"go.opentelemetry.io/otel/internal/global"
|
||
|
|
"go.opentelemetry.io/otel/metric"
|
||
|
|
)
|
||
|
|
|
||
|
|
var (
|
||
|
|
globalMeterProvider = defaultMeterProvider()
|
||
|
|
|
||
|
|
delegateMeterOnce sync.Once
|
||
|
|
)
|
||
|
|
|
||
|
|
type meterProviderHolder struct {
|
||
|
|
mp metric.MeterProvider
|
||
|
|
}
|
||
|
|
|
||
|
|
// MeterProvider is the internal implementation for global.MeterProvider.
|
||
|
|
func MeterProvider() metric.MeterProvider {
|
||
|
|
return globalMeterProvider.Load().(meterProviderHolder).mp
|
||
|
|
}
|
||
|
|
|
||
|
|
// SetMeterProvider is the internal implementation for global.SetMeterProvider.
|
||
|
|
func SetMeterProvider(mp metric.MeterProvider) {
|
||
|
|
current := MeterProvider()
|
||
|
|
if _, cOk := current.(*meterProvider); cOk {
|
||
|
|
if _, mpOk := mp.(*meterProvider); mpOk && current == mp {
|
||
|
|
// Do not assign the default delegating MeterProvider to delegate
|
||
|
|
// to itself.
|
||
|
|
global.Error(
|
||
|
|
errors.New("no delegate configured in meter provider"),
|
||
|
|
"Setting meter provider to it's current value. No delegate will be configured",
|
||
|
|
)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
delegateMeterOnce.Do(func() {
|
||
|
|
if def, ok := current.(*meterProvider); ok {
|
||
|
|
def.setDelegate(mp)
|
||
|
|
}
|
||
|
|
})
|
||
|
|
globalMeterProvider.Store(meterProviderHolder{mp: mp})
|
||
|
|
}
|
||
|
|
|
||
|
|
func defaultMeterProvider() *atomic.Value {
|
||
|
|
v := &atomic.Value{}
|
||
|
|
v.Store(meterProviderHolder{mp: &meterProvider{}})
|
||
|
|
return v
|
||
|
|
}
|