@opencensus/core
Version:
OpenCensus is a toolkit for collecting application performance and behavior data.
92 lines • 3.79 kB
JavaScript
;
/**
* Copyright 2018, OpenCensus 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
*
* http://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.Recorder = void 0;
const types_1 = require("./types");
const UNKNOWN_TAG_VALUE = null;
class Recorder {
static addMeasurement(aggregationData, measurement, attachments) {
aggregationData.timestamp = Date.now();
const value = measurement.measure.type === types_1.MeasureType.DOUBLE
? measurement.value
: Math.trunc(measurement.value);
switch (aggregationData.type) {
case types_1.AggregationType.DISTRIBUTION:
return this.addToDistribution(aggregationData, value, attachments);
case types_1.AggregationType.SUM:
return this.addToSum(aggregationData, value);
case types_1.AggregationType.COUNT:
return this.addToCount(aggregationData, value);
default:
return this.addToLastValue(aggregationData, value);
}
}
/** Gets the tag values from tags and columns */
static getTagValues(tags, columns) {
return columns.map(tagKey => tags.get(tagKey) ||
/** replace not found key values by null. */ UNKNOWN_TAG_VALUE);
}
static addToDistribution(distributionData, value, attachments) {
distributionData.count += 1;
let bucketIndex = distributionData.buckets.findIndex(bucket => bucket > value);
if (bucketIndex < 0) {
bucketIndex = distributionData.buckets.length;
}
if (distributionData.bucketCounts &&
distributionData.bucketCounts.length > bucketIndex) {
distributionData.bucketCounts[bucketIndex] += 1;
}
if (distributionData.count === 1) {
distributionData.mean = value;
}
distributionData.sum += value;
const oldMean = distributionData.mean;
distributionData.mean =
distributionData.mean +
(value - distributionData.mean) / distributionData.count;
distributionData.sumOfSquaredDeviation =
distributionData.sumOfSquaredDeviation +
(value - oldMean) * (value - distributionData.mean);
distributionData.stdDeviation = Math.sqrt(distributionData.sumOfSquaredDeviation / distributionData.count);
// No implicit recording for exemplars - if there are no attachments
// (contextual information), don't record exemplars.
if (attachments &&
distributionData.exemplars &&
distributionData.exemplars.length > bucketIndex) {
distributionData.exemplars[bucketIndex] = {
value,
timestamp: distributionData.timestamp,
attachments,
};
}
return distributionData;
}
static addToSum(sumData, value) {
sumData.value += value;
return sumData;
}
static addToCount(countData, value) {
countData.value += 1;
return countData;
}
static addToLastValue(lastValueData, value) {
lastValueData.value = value;
return lastValueData;
}
}
exports.Recorder = Recorder;
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