@opentelemetry/sdk-metrics
Version:
37 lines • 1.26 kB
JavaScript
/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
import { FixedSizeExemplarReservoirBase } from './ExemplarReservoir';
/**
* Fixed size reservoir that uses equivalent of naive reservoir sampling
* algorithm to accept measurements.
*
*/
export class SimpleFixedSizeExemplarReservoir extends FixedSizeExemplarReservoirBase {
_numMeasurementsSeen;
constructor(size) {
super(size);
this._numMeasurementsSeen = 0;
}
getRandomInt(min, max) {
//[min, max)
return Math.floor(Math.random() * (max - min) + min);
}
_findBucketIndex(_value, _timestamp, _attributes, _ctx) {
if (this._numMeasurementsSeen < this._size)
return this._numMeasurementsSeen++;
const index = this.getRandomInt(0, ++this._numMeasurementsSeen);
return index < this._size ? index : -1;
}
offer(value, timestamp, attributes, ctx) {
const index = this._findBucketIndex(value, timestamp, attributes, ctx);
if (index !== -1) {
this._reservoirStorage[index].offer(value, timestamp, attributes, ctx);
}
}
reset() {
this._numMeasurementsSeen = 0;
}
}
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