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"use strict";
/**
* 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 });
const time_util_1 = require("../../common/time-util");
const validations_1 = require("../../common/validations");
const utils_1 = require("../utils");
/**
* Gauge metric
*/
class Gauge {
/**
* Constructs a new Gauge instance.
*
* @param {string} name The name of the metric.
* @param {string} description The description of the metric.
* @param {string} unit The unit of the metric.
* @param {MetricDescriptorType} type The type of metric.
* @param {LabelKey[]} labelKeys The list of the label keys.
*/
constructor(name, description, unit, type, labelKeys) {
this.labelKeys = labelKeys;
this.registeredPoints = new Map();
this.metricDescriptor = { name, description, unit, type, labelKeys };
this.labelKeysLength = labelKeys.length;
this.defaultLabelValues = utils_1.initializeDefaultLabels(this.labelKeysLength);
}
/**
* Creates a TimeSeries and returns a Point if the specified
* labelValues is not already associated with this gauge, else returns an
* existing Point.
*
* It is recommended to keep a reference to the Point instead of always
* calling this method for manual operations.
*
* @param {LabelValue[]} labelValues The list of the label values.
* @returns {types.Point} The value of single gauge.
*/
getOrCreateTimeSeries(labelValues) {
validations_1.validateArrayElementsNotNull(validations_1.validateNotNull(labelValues, Gauge.LABEL_VALUES), Gauge.LABEL_VALUE);
return this.registerTimeSeries(labelValues);
}
/**
* Returns a Point for a gauge with all labels not set, or default
* labels.
*
* @returns {types.Point} The value of single gauge.
*/
getDefaultTimeSeries() {
return this.registerTimeSeries(this.defaultLabelValues);
}
/**
* Removes the TimeSeries from the gauge metric, if it is present. i.e.
* references to previous Point objects are invalid (not part of the
* metric).
*
* @param {LabelValue[]} labelValues The list of label values.
*/
removeTimeSeries(labelValues) {
validations_1.validateNotNull(labelValues, Gauge.LABEL_VALUES);
this.registeredPoints.delete(utils_1.hashLabelValues(labelValues));
}
/**
* Removes all TimeSeries from the gauge metric. i.e. references to all
* previous Point objects are invalid (not part of the metric).
*/
clear() {
this.registeredPoints.clear();
}
/**
* Registers a TimeSeries and returns a Point if the specified
* labelValues is not already associated with this gauge, else returns an
* existing Point.
*
* @param {LabelValue[]} labelValues The list of the label values.
* @returns {types.Point} The value of single gauge.
*/
registerTimeSeries(labelValues) {
const hash = utils_1.hashLabelValues(labelValues);
// return if the specified labelValues is already associated with the point.
if (this.registeredPoints.has(hash)) {
return this.registeredPoints.get(hash);
}
if (this.labelKeysLength !== labelValues.length) {
throw new Error(Gauge.ERROR_MESSAGE_INVALID_SIZE);
}
const point = new PointEntry(labelValues);
this.registeredPoints.set(hash, point);
return point;
}
/**
* Provides a Metric with one or more TimeSeries.
*
* @returns {Metric} The Metric.
*/
getMetric() {
if (this.registeredPoints.size === 0) {
return null;
}
const timestamp = time_util_1.getTimestampWithProcessHRTime();
return {
descriptor: this.metricDescriptor,
timeseries: Array.from(this.registeredPoints, ([_, point]) => point.getTimeSeries(timestamp))
};
}
}
Gauge.LABEL_VALUE = 'labelValue';
Gauge.LABEL_VALUES = 'labelValues';
Gauge.ERROR_MESSAGE_INVALID_SIZE = 'Label Keys and Label Values don\'t have same size';
exports.Gauge = Gauge;
/**
* The value of a single point in the Gauge.TimeSeries.
*/
class PointEntry {
constructor(labelValues) {
this.value = 0;
this.labelValues = labelValues;
}
/**
* Adds the given value to the current value. The values can be negative.
*
* @param {number} amt The value to add.
*/
add(amt) {
this.value = this.value + amt;
}
/**
* Sets the given value.
*
* @param {number} val The new value.
*/
set(val) {
this.value = val;
}
/**
* Returns the TimeSeries with one or more Point.
*
* @param {Timestamp} timestamp The time at which the gauge is recorded.
* @returns {TimeSeries} The TimeSeries.
*/
getTimeSeries(timestamp) {
return {
labelValues: this.labelValues,
points: [{ value: this.value, timestamp }]
};
}
}
exports.PointEntry = PointEntry;
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