26 lines
2.1 KiB
JavaScript
26 lines
2.1 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const units_1 = require("./units");
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class ExponentiallyWeightedMovingAverage {
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constructor(timePeriod, tickInterval) {
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this._count = 0;
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this._rate = 0;
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this.TICK_INTERVAL = 5 * units_1.default.SECONDS;
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this._timePeriod = timePeriod || 1 * units_1.default.MINUTES;
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this._tickInterval = tickInterval || this.TICK_INTERVAL;
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this._alpha = 1 - Math.exp(-this._tickInterval / this._timePeriod);
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}
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update(n) {
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this._count += n;
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}
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tick() {
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const instantRate = this._count / this._tickInterval;
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this._count = 0;
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this._rate += (this._alpha * (instantRate - this._rate));
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}
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rate(timeUnit) {
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return (this._rate || 0) * timeUnit;
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}
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}
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exports.default = ExponentiallyWeightedMovingAverage;
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