mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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4047c0877a
* Update api for Must constructors, with SDK helpers * Update for Must constructors, leaving TODOs about global errors * Add tests * Move Must methods into metric.Must * Apply the feedback * Remove interfaces * Remove more interfaces * Again... * Remove a sentence about a dead inteface
91 lines
2.5 KiB
Go
91 lines
2.5 KiB
Go
// Copyright 2019, 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 metric
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import (
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"context"
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"errors"
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"go.opentelemetry.io/otel/api/core"
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)
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type commonMetric struct {
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instrument InstrumentImpl
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}
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type commonBoundInstrument struct {
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boundInstrument BoundInstrumentImpl
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}
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var ErrSDKReturnedNilImpl = errors.New("SDK returned a nil implementation")
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func (m commonMetric) bind(labels LabelSet) commonBoundInstrument {
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return newCommonBoundInstrument(m.instrument.Bind(labels))
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}
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func (m commonMetric) float64Measurement(value float64) Measurement {
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return newMeasurement(m.instrument, core.NewFloat64Number(value))
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}
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func (m commonMetric) int64Measurement(value int64) Measurement {
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return newMeasurement(m.instrument, core.NewInt64Number(value))
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}
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func (m commonMetric) directRecord(ctx context.Context, number core.Number, labels LabelSet) {
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m.instrument.RecordOne(ctx, number, labels)
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}
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func (m commonMetric) Impl() InstrumentImpl {
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return m.instrument
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}
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func (h commonBoundInstrument) directRecord(ctx context.Context, number core.Number) {
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h.boundInstrument.RecordOne(ctx, number)
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}
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func (h commonBoundInstrument) Unbind() {
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h.boundInstrument.Unbind()
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}
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func newCommonMetric(instrument InstrumentImpl, err error) (commonMetric, error) {
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if instrument == nil {
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if err == nil {
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err = ErrSDKReturnedNilImpl
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}
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// Note: an alternate behavior would be to synthesize a new name
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// or group all duplicately-named instruments of a certain type
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// together and use a tag for the original name, e.g.,
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// name = 'invalid.counter.int64'
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// label = 'original-name=duplicate-counter-name'
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instrument = noopInstrument{}
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}
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return commonMetric{
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instrument: instrument,
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}, err
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}
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func newCommonBoundInstrument(boundInstrument BoundInstrumentImpl) commonBoundInstrument {
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return commonBoundInstrument{
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boundInstrument: boundInstrument,
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}
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}
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func newMeasurement(instrument InstrumentImpl, number core.Number) Measurement {
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return Measurement{
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instrument: instrument,
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number: number,
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}
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}
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