/
NoopMeter.ts
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/
NoopMeter.ts
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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
*
* https://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.
*/
import { Meter } from './Meter';
import {
BatchObservableCallback,
Counter,
Histogram,
MetricOptions,
ObservableCallback,
ObservableCounter,
ObservableGauge,
ObservableUpDownCounter,
UpDownCounter,
MetricAttributes,
Observable,
} from './Metric';
/**
* NoopMeter is a noop implementation of the {@link Meter} interface. It reuses
* constant NoopMetrics for all of its methods.
*/
export class NoopMeter implements Meter {
constructor() {}
/**
* @see {@link Meter.createHistogram}
*/
createHistogram(_name: string, _options?: MetricOptions): Histogram {
return NOOP_HISTOGRAM_METRIC;
}
/**
* @see {@link Meter.createCounter}
*/
createCounter(_name: string, _options?: MetricOptions): Counter {
return NOOP_COUNTER_METRIC;
}
/**
* @see {@link Meter.createUpDownCounter}
*/
createUpDownCounter(_name: string, _options?: MetricOptions): UpDownCounter {
return NOOP_UP_DOWN_COUNTER_METRIC;
}
/**
* @see {@link Meter.createObservableGauge}
*/
createObservableGauge(
_name: string,
_options?: MetricOptions
): ObservableGauge {
return NOOP_OBSERVABLE_GAUGE_METRIC;
}
/**
* @see {@link Meter.createObservableCounter}
*/
createObservableCounter(
_name: string,
_options?: MetricOptions
): ObservableCounter {
return NOOP_OBSERVABLE_COUNTER_METRIC;
}
/**
* @see {@link Meter.createObservableUpDownCounter}
*/
createObservableUpDownCounter(
_name: string,
_options?: MetricOptions
): ObservableUpDownCounter {
return NOOP_OBSERVABLE_UP_DOWN_COUNTER_METRIC;
}
/**
* @see {@link Meter.addBatchObservableCallback}
*/
addBatchObservableCallback(
_callback: BatchObservableCallback,
_observables: Observable[]
): void {}
/**
* @see {@link Meter.removeBatchObservableCallback}
*/
removeBatchObservableCallback(_callback: BatchObservableCallback): void {}
}
export class NoopMetric {}
export class NoopCounterMetric extends NoopMetric implements Counter {
add(_value: number, _attributes: MetricAttributes): void {}
}
export class NoopUpDownCounterMetric
extends NoopMetric
implements UpDownCounter
{
add(_value: number, _attributes: MetricAttributes): void {}
}
export class NoopHistogramMetric extends NoopMetric implements Histogram {
record(_value: number, _attributes: MetricAttributes): void {}
}
export class NoopObservableMetric {
addCallback(_callback: ObservableCallback) {}
removeCallback(_callback: ObservableCallback) {}
}
export class NoopObservableCounterMetric
extends NoopObservableMetric
implements ObservableCounter {}
export class NoopObservableGaugeMetric
extends NoopObservableMetric
implements ObservableGauge {}
export class NoopObservableUpDownCounterMetric
extends NoopObservableMetric
implements ObservableUpDownCounter {}
export const NOOP_METER = new NoopMeter();
// Synchronous instruments
export const NOOP_COUNTER_METRIC = new NoopCounterMetric();
export const NOOP_HISTOGRAM_METRIC = new NoopHistogramMetric();
export const NOOP_UP_DOWN_COUNTER_METRIC = new NoopUpDownCounterMetric();
// Asynchronous instruments
export const NOOP_OBSERVABLE_COUNTER_METRIC = new NoopObservableCounterMetric();
export const NOOP_OBSERVABLE_GAUGE_METRIC = new NoopObservableGaugeMetric();
export const NOOP_OBSERVABLE_UP_DOWN_COUNTER_METRIC =
new NoopObservableUpDownCounterMetric();
/**
* Create a no-op Meter
*/
export function createNoopMeter(): Meter {
return NOOP_METER;
}