@probe.gl/stats/dist/lib/stat.js

Stats object for reporting performance statistics

import getHiResTimestamp from "../utils/hi-res-timestamp.js";
export default class Stat {
    constructor(name, type) {
        this.sampleSize = 1;
        this.time = 0;
        this.count = 0;
        this.samples = 0;
        this.lastTiming = 0;
        this.lastSampleTime = 0;
        this.lastSampleCount = 0;
        this._count = 0;
        this._time = 0;
        this._samples = 0;
        this._startTime = 0;
        this._timerPending = false;
        this.name = name;
        this.type = type;
        this.reset();
    }
    reset() {
        this.time = 0;
        this.count = 0;
        this.samples = 0;
        this.lastTiming = 0;
        this.lastSampleTime = 0;
        this.lastSampleCount = 0;
        this._count = 0;
        this._time = 0;
        this._samples = 0;
        this._startTime = 0;
        this._timerPending = false;
        return this;
    }
    setSampleSize(samples) {
        this.sampleSize = samples;
        return this;
    }
    /** Call to increment count (+1) */
    incrementCount() {
        this.addCount(1);
        return this;
    }
    /** Call to decrement count (-1) */
    decrementCount() {
        this.subtractCount(1);
        return this;
    }
    /** Increase count */
    addCount(value) {
        this._count += value;
        this._samples++;
        this._checkSampling();
        return this;
    }
    /** Decrease count */
    subtractCount(value) {
        this._count -= value;
        this._samples++;
        this._checkSampling();
        return this;
    }
    /** Add an arbitrary timing and bump the count */
    addTime(time) {
        this._time += time;
        this.lastTiming = time;
        this._samples++;
        this._checkSampling();
        return this;
    }
    /** Start a timer */
    timeStart() {
        this._startTime = getHiResTimestamp();
        this._timerPending = true;
        return this;
    }
    /** End a timer. Adds to time and bumps the timing count. */
    timeEnd() {
        if (!this._timerPending) {
            return this;
        }
        this.addTime(getHiResTimestamp() - this._startTime);
        this._timerPending = false;
        this._checkSampling();
        return this;
    }
    getSampleAverageCount() {
        return this.sampleSize > 0 ? this.lastSampleCount / this.sampleSize : 0;
    }
    /** Calculate average time / count for the previous window */
    getSampleAverageTime() {
        return this.sampleSize > 0 ? this.lastSampleTime / this.sampleSize : 0;
    }
    /** Calculate counts per second for the previous window */
    getSampleHz() {
        return this.lastSampleTime > 0 ? this.sampleSize / (this.lastSampleTime / 1000) : 0;
    }
    getAverageCount() {
        return this.samples > 0 ? this.count / this.samples : 0;
    }
    /** Calculate average time / count */
    getAverageTime() {
        return this.samples > 0 ? this.time / this.samples : 0;
    }
    /** Calculate counts per second */
    getHz() {
        return this.time > 0 ? this.samples / (this.time / 1000) : 0;
    }
    _checkSampling() {
        if (this._samples === this.sampleSize) {
            this.lastSampleTime = this._time;
            this.lastSampleCount = this._count;
            this.count += this._count;
            this.time += this._time;
            this.samples += this._samples;
            this._time = 0;
            this._count = 0;
            this._samples = 0;
        }
    }
}
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