70 lines
1.7 KiB
JavaScript
70 lines
1.7 KiB
JavaScript
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const binarySearchBounds = require("./binarySearchBounds");
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/** @typedef {function(number): void} Callback */
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class ParallelismFactorCalculator {
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constructor() {
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/** @type {number[]} */
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this._rangePoints = [];
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/** @type {Callback[]} */
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this._rangeCallbacks = [];
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}
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/**
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* @param {number} start range start
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* @param {number} end range end
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* @param {Callback} callback callback
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* @returns {void}
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*/
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range(start, end, callback) {
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if (start === end) return callback(1);
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this._rangePoints.push(start);
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this._rangePoints.push(end);
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this._rangeCallbacks.push(callback);
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}
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calculate() {
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const segments = Array.from(new Set(this._rangePoints)).sort((a, b) =>
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a < b ? -1 : 1
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);
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const parallelism = segments.map(() => 0);
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const rangeStartIndices = [];
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for (let i = 0; i < this._rangePoints.length; i += 2) {
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const start = this._rangePoints[i];
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const end = this._rangePoints[i + 1];
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let idx = binarySearchBounds.eq(segments, start);
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rangeStartIndices.push(idx);
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do {
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parallelism[idx]++;
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idx++;
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} while (segments[idx] < end);
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}
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for (let i = 0; i < this._rangeCallbacks.length; i++) {
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const start = this._rangePoints[i * 2];
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const end = this._rangePoints[i * 2 + 1];
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let idx = rangeStartIndices[i];
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let sum = 0;
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let totalDuration = 0;
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let current = start;
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do {
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const p = parallelism[idx];
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idx++;
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const duration = segments[idx] - current;
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totalDuration += duration;
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current = segments[idx];
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sum += p * duration;
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} while (current < end);
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this._rangeCallbacks[i](sum / totalDuration);
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}
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}
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}
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module.exports = ParallelismFactorCalculator;
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