opentelemetry-go/api/metric/common.go

// Copyright 2019, 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 metric

import (
	"context"
	"sync/atomic"
)

var (
	descriptorID uint64
)

type commonMetric struct {
	d *Descriptor
}

var _ ExplicitReportingMetric = commonMetric{}

func (m commonMetric) Descriptor() *Descriptor {
	return m.d
}

func (m commonMetric) SupportHandle() hiddenType {
	return hiddenType{}
}

func (m commonMetric) getHandle(labels LabelSet) Handle {
	return labels.Meter().NewHandle(m, labels)
}

func (m commonMetric) float64Measurement(value float64) Measurement {
	return Measurement{
		Descriptor: m.d,
		Value:      NewFloat64MeasurementValue(value),
	}
}

func (m commonMetric) int64Measurement(value int64) Measurement {
	return Measurement{
		Descriptor: m.d,
		Value:      NewInt64MeasurementValue(value),
	}
}

func (m commonMetric) recordOne(ctx context.Context, value MeasurementValue, labels LabelSet) {
	labels.Meter().RecordBatch(ctx, labels, Measurement{
		Descriptor: m.d,
		Value:      value,
	})
}

func registerCommonMetric(name string, kind Kind, valueKind ValueKind) commonMetric {
	return commonMetric{
		d: registerDescriptor(name, kind, valueKind),
	}
}

func registerDescriptor(name string, kind Kind, valueKind ValueKind) *Descriptor {
	return &Descriptor{
		name:      name,
		kind:      kind,
		valueKind: valueKind,
		id:        DescriptorID(atomic.AddUint64(&descriptorID, 1)),
	}
}