@opentelemetry/sdk-metrics
Version:
93 lines • 3.6 kB
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.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.LastValueAggregator = exports.LastValueAccumulation = void 0;
const types_1 = require("./types");
const core_1 = require("@opentelemetry/core");
const MetricData_1 = require("../export/MetricData");
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 = (0, core_1.millisToHrTime)(Date.now());
}
setStartTime(startTime) {
this.startTime = startTime;
}
toPointValue() {
return this._current;
}
}
exports.LastValueAccumulation = LastValueAccumulation;
/** Basic aggregator which calculates a LastValue from individual measurements. */
class LastValueAggregator {
kind = types_1.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 = (0, core_1.hrTimeToMicroseconds)(delta.sampleTime) >=
(0, core_1.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 = (0, core_1.hrTimeToMicroseconds)(current.sampleTime) >=
(0, core_1.hrTimeToMicroseconds)(previous.sampleTime)
? current
: previous;
return new LastValueAccumulation(current.startTime, latestAccumulation.toPointValue(), latestAccumulation.sampleTime);
}
toMetricData(descriptor, aggregationTemporality, accumulationByAttributes, endTime) {
return {
descriptor,
aggregationTemporality,
dataPointType: MetricData_1.DataPointType.GAUGE,
dataPoints: accumulationByAttributes.map(([attributes, accumulation]) => {
return {
attributes,
startTime: accumulation.startTime,
endTime,
value: accumulation.toPointValue(),
};
}),
};
}
}
exports.LastValueAggregator = LastValueAggregator;
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