/
AsyncMetricStorage.ts
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/
AsyncMetricStorage.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 { HrTime } from '@opentelemetry/api';
import { Accumulation, Aggregator } from '../aggregator/types';
import { InstrumentDescriptor } from '../InstrumentDescriptor';
import { AttributesProcessor } from '../view/AttributesProcessor';
import { MetricStorage } from './MetricStorage';
import { MetricData } from '../export/MetricData';
import { DeltaMetricProcessor } from './DeltaMetricProcessor';
import { TemporalMetricProcessor } from './TemporalMetricProcessor';
import { Maybe } from '../utils';
import { MetricCollectorHandle } from './MetricCollector';
import { AttributeHashMap } from './HashMap';
import { AsyncWritableMetricStorage } from './WritableMetricStorage';
/**
* Internal interface.
*
* Stores and aggregates {@link MetricData} for asynchronous instruments.
*/
export class AsyncMetricStorage<T extends Maybe<Accumulation>>
extends MetricStorage
implements AsyncWritableMetricStorage
{
private _deltaMetricStorage: DeltaMetricProcessor<T>;
private _temporalMetricStorage: TemporalMetricProcessor<T>;
constructor(
_instrumentDescriptor: InstrumentDescriptor,
aggregator: Aggregator<T>,
private _attributesProcessor: AttributesProcessor,
collectorHandles: MetricCollectorHandle[]
) {
super(_instrumentDescriptor);
this._deltaMetricStorage = new DeltaMetricProcessor(aggregator);
this._temporalMetricStorage = new TemporalMetricProcessor(
aggregator,
collectorHandles
);
}
record(measurements: AttributeHashMap<number>, observationTime: HrTime) {
const processed = new AttributeHashMap<number>();
Array.from(measurements.entries()).forEach(([attributes, value]) => {
processed.set(this._attributesProcessor.process(attributes), value);
});
this._deltaMetricStorage.batchCumulate(processed, observationTime);
}
/**
* Collects the metrics from this storage. The ObservableCallback is invoked
* during the collection.
*
* Note: This is a stateful operation and may reset any interval-related
* state for the MetricCollector.
*/
collect(
collector: MetricCollectorHandle,
collectionTime: HrTime
): Maybe<MetricData> {
const accumulations = this._deltaMetricStorage.collect();
return this._temporalMetricStorage.buildMetrics(
collector,
this._instrumentDescriptor,
accumulations,
collectionTime
);
}
}