@opentelemetry/sdk-metrics
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JavaScript
/*
* 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 { AggregatorKind, } from './types';
import { millisToHrTime, hrTimeToMicroseconds } from '@opentelemetry/core';
import { DataPointType } from '../export/MetricData';
export class LastValueAccumulation {
startTime;
_current;
sampleTime;
constructor(startTime, current = 0, sampleTime = [0, 0]) {
this.startTime = startTime;
this._current = current;
this.sampleTime = sampleTime;
}
record(value) {
this._current = value;
this.sampleTime = millisToHrTime(Date.now());
}
setStartTime(startTime) {
this.startTime = startTime;
}
toPointValue() {
return this._current;
}
}
/** Basic aggregator which calculates a LastValue from individual measurements. */
export class LastValueAggregator {
kind = AggregatorKind.LAST_VALUE;
createAccumulation(startTime) {
return new LastValueAccumulation(startTime);
}
/**
* Returns the result of the merge of the given accumulations.
*
* Return the newly captured (delta) accumulation for LastValueAggregator.
*/
merge(previous, delta) {
// nanoseconds may lose precisions.
const latestAccumulation = hrTimeToMicroseconds(delta.sampleTime) >=
hrTimeToMicroseconds(previous.sampleTime)
? delta
: previous;
return new LastValueAccumulation(previous.startTime, latestAccumulation.toPointValue(), latestAccumulation.sampleTime);
}
/**
* Returns a new DELTA aggregation by comparing two cumulative measurements.
*
* A delta aggregation is not meaningful to LastValueAggregator, just return
* the newly captured (delta) accumulation for LastValueAggregator.
*/
diff(previous, current) {
// nanoseconds may lose precisions.
const latestAccumulation = hrTimeToMicroseconds(current.sampleTime) >=
hrTimeToMicroseconds(previous.sampleTime)
? current
: previous;
return new LastValueAccumulation(current.startTime, latestAccumulation.toPointValue(), latestAccumulation.sampleTime);
}
toMetricData(descriptor, aggregationTemporality, accumulationByAttributes, endTime) {
return {
descriptor,
aggregationTemporality,
dataPointType: DataPointType.GAUGE,
dataPoints: accumulationByAttributes.map(([attributes, accumulation]) => {
return {
attributes,
startTime: accumulation.startTime,
endTime,
value: accumulation.toPointValue(),
};
}),
};
}
}
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