source: trip-planner-front/node_modules/p-limit/index.js@ 8d391a1

Last change on this file since 8d391a1 was e29cc2e, checked in by Ema <ema_spirova@…>, 3 years ago

primeNG components

  • Property mode set to 100644
File size: 1.1 KB
Line 
1'use strict';
2const pTry = require('p-try');
3
4const pLimit = concurrency => {
5 if (!((Number.isInteger(concurrency) || concurrency === Infinity) && concurrency > 0)) {
6 return Promise.reject(new TypeError('Expected `concurrency` to be a number from 1 and up'));
7 }
8
9 const queue = [];
10 let activeCount = 0;
11
12 const next = () => {
13 activeCount--;
14
15 if (queue.length > 0) {
16 queue.shift()();
17 }
18 };
19
20 const run = (fn, resolve, ...args) => {
21 activeCount++;
22
23 const result = pTry(fn, ...args);
24
25 resolve(result);
26
27 result.then(next, next);
28 };
29
30 const enqueue = (fn, resolve, ...args) => {
31 if (activeCount < concurrency) {
32 run(fn, resolve, ...args);
33 } else {
34 queue.push(run.bind(null, fn, resolve, ...args));
35 }
36 };
37
38 const generator = (fn, ...args) => new Promise(resolve => enqueue(fn, resolve, ...args));
39 Object.defineProperties(generator, {
40 activeCount: {
41 get: () => activeCount
42 },
43 pendingCount: {
44 get: () => queue.length
45 },
46 clearQueue: {
47 value: () => {
48 queue.length = 0;
49 }
50 }
51 });
52
53 return generator;
54};
55
56module.exports = pLimit;
57module.exports.default = pLimit;
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