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102 changes: 102 additions & 0 deletions
102
experimental/packages/opentelemetry-sdk-metrics-base/src/state/MeterSharedState.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| /* | ||
| * 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 * as metrics from '@opentelemetry/api-metrics-wip'; | ||
| import { InstrumentationLibrary } from '@opentelemetry/core'; | ||
| import { MetricData } from '..'; | ||
| import { createInstrumentDescriptorWithView, InstrumentDescriptor } from '../InstrumentDescriptor'; | ||
| import { isNotNullish, promiseFinally } from '../utils'; | ||
| import { AsyncMetricStorage } from './AsyncMetricStorage'; | ||
| import { MeterProviderSharedState } from './MeterProviderSharedState'; | ||
| import { MetricCollectorHandle } from './MetricCollector'; | ||
| import { MetricStorage } from './MetricStorage'; | ||
| import { MultiMetricStorage } from './MultiWritableMetricStorage'; | ||
| import { ObservableRegistry } from './ObservableRegistry'; | ||
| import { SyncMetricStorage } from './SyncMetricStorage'; | ||
|
|
||
| /** | ||
| * An internal record for shared meter provider states. | ||
| */ | ||
| export class MeterSharedState { | ||
| private _metricStorageRegistry = new Map<string, MetricStorage>(); | ||
| private _pendingCollectPromise: Promise<MetricData[]> | null = null; | ||
| private _observableRegistry = new ObservableRegistry(); | ||
|
|
||
| constructor(private _meterProviderSharedState: MeterProviderSharedState, private _instrumentationLibrary: InstrumentationLibrary) {} | ||
|
|
||
| registerMetricStorage(descriptor: InstrumentDescriptor) { | ||
| const views = this._meterProviderSharedState.viewRegistry.findViews(descriptor, this._instrumentationLibrary); | ||
| const storages = views.map(view => { | ||
| const viewDescriptor = createInstrumentDescriptorWithView(view, descriptor); | ||
| const aggregator = view.aggregation.createAggregator(viewDescriptor); | ||
| const storage = new SyncMetricStorage(viewDescriptor, aggregator, view.attributesProcessor); | ||
| // TODO: handle conflicts | ||
| this._metricStorageRegistry.set(viewDescriptor.name, storage); | ||
| return storage; | ||
| }); | ||
| if (storages.length === 1) { | ||
| return storages[0]; | ||
| } | ||
| return new MultiMetricStorage(storages); | ||
| } | ||
|
|
||
| registerAsyncMetricStorage(descriptor: InstrumentDescriptor, callback: metrics.ObservableCallback) { | ||
| const views = this._meterProviderSharedState.viewRegistry.findViews(descriptor, this._instrumentationLibrary); | ||
| views.forEach(view => { | ||
| const viewDescriptor = createInstrumentDescriptorWithView(view, descriptor); | ||
| const aggregator = view.aggregation.createAggregator(viewDescriptor); | ||
| const storage = new AsyncMetricStorage(viewDescriptor, aggregator, view.attributesProcessor, callback, this._observableRegistry); | ||
| this._observableRegistry.addCallback(callback, storage); | ||
| // TODO: handle conflicts | ||
| this._metricStorageRegistry.set(viewDescriptor.name, storage); | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * @param collector opaque handle of {@link MetricCollector} which initiated the collection. | ||
| * @param collectionTime the HrTime at which the collection was initiated. | ||
| * @returns the list of {@link MetricData} collected. | ||
| */ | ||
| collect(collector: MetricCollectorHandle, collectionTime: HrTime): Promise<MetricData[]> { | ||
| if (this._pendingCollectPromise != null) { | ||
| return this._pendingCollectPromise; | ||
| } | ||
|
|
||
| /** | ||
| * 1. Call all observable callbacks first. | ||
| * 2. Collect metric result for the collector. | ||
| */ | ||
| const promise = this._observableRegistry.observe() | ||
| .then(() => { | ||
| return Array.from(this._metricStorageRegistry.values()).map(metricStorage => { | ||
| return metricStorage.collect( | ||
| collector, | ||
| this._meterProviderSharedState.metricCollectors, | ||
| this._meterProviderSharedState.resource, | ||
| this._instrumentationLibrary, | ||
| this._meterProviderSharedState.sdkStartTime, | ||
| collectionTime); | ||
| }) | ||
| .filter(isNotNullish); | ||
| }); | ||
|
|
||
| this._pendingCollectPromise = promiseFinally(promise, () => { | ||
| this._pendingCollectPromise = null; | ||
| }); | ||
| return this._pendingCollectPromise; | ||
| } | ||
| } |
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