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