/
metrics.ts
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/
metrics.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 '../types/Meter';
import { MeterProvider } from '../types/MeterProvider';
import { NOOP_METER_PROVIDER } from '../NoopMeterProvider';
import {
API_BACKWARDS_COMPATIBILITY_VERSION,
GLOBAL_METRICS_API_KEY,
makeGetter,
_global,
} from './global-utils';
/**
* Singleton object which represents the entry point to the OpenTelemetry Metrics API
*/
export class MetricsAPI {
private static _instance?: MetricsAPI;
/** Empty private constructor prevents end users from constructing a new instance of the API */
private constructor() {}
/** Get the singleton instance of the Metrics API */
public static getInstance(): MetricsAPI {
if (!this._instance) {
this._instance = new MetricsAPI();
}
return this._instance;
}
/**
* Set the current global meter. Returns the initialized global meter provider.
*/
public setGlobalMeterProvider(provider: MeterProvider): MeterProvider {
if (_global[GLOBAL_METRICS_API_KEY]) {
// global meter provider has already been set
return this.getMeterProvider();
}
_global[GLOBAL_METRICS_API_KEY] = makeGetter(
API_BACKWARDS_COMPATIBILITY_VERSION,
provider,
NOOP_METER_PROVIDER
);
return provider;
}
/**
* Returns the global meter provider.
*/
public getMeterProvider(): MeterProvider {
return (
_global[GLOBAL_METRICS_API_KEY]?.(API_BACKWARDS_COMPATIBILITY_VERSION) ??
NOOP_METER_PROVIDER
);
}
/**
* Returns a meter from the global meter provider.
*/
public getMeter(name: string, version?: string): Meter {
return this.getMeterProvider().getMeter(name, version);
}
/** Remove the global meter provider */
public disable(): void {
delete _global[GLOBAL_METRICS_API_KEY];
}
}