Last change
on this file since ceaed42 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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Property mode
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100644
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File size:
1.2 KB
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[6a3a178] | 1 | 'use strict';
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| 2 |
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| 3 | function Queue(options) {
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| 4 | if (!(this instanceof Queue)) {
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| 5 | return new Queue(options);
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| 6 | }
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| 7 |
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| 8 | options = options || {};
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| 9 | this.concurrency = options.concurrency || Infinity;
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| 10 | this.pending = 0;
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| 11 | this.jobs = [];
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| 12 | this.cbs = [];
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| 13 | this._done = done.bind(this);
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| 14 | }
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| 15 |
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| 16 | var arrayAddMethods = [
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| 17 | 'push',
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| 18 | 'unshift',
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| 19 | 'splice'
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| 20 | ];
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| 21 |
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| 22 | arrayAddMethods.forEach(function(method) {
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| 23 | Queue.prototype[method] = function() {
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| 24 | var methodResult = Array.prototype[method].apply(this.jobs, arguments);
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| 25 | this._run();
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| 26 | return methodResult;
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| 27 | };
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| 28 | });
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| 29 |
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| 30 | Object.defineProperty(Queue.prototype, 'length', {
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| 31 | get: function() {
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| 32 | return this.pending + this.jobs.length;
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| 33 | }
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| 34 | });
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| 35 |
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| 36 | Queue.prototype._run = function() {
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| 37 | if (this.pending === this.concurrency) {
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| 38 | return;
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| 39 | }
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| 40 | if (this.jobs.length) {
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| 41 | var job = this.jobs.shift();
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| 42 | this.pending++;
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| 43 | job(this._done);
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| 44 | this._run();
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| 45 | }
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| 46 |
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| 47 | if (this.pending === 0) {
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| 48 | while (this.cbs.length !== 0) {
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| 49 | var cb = this.cbs.pop();
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| 50 | process.nextTick(cb);
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| 51 | }
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| 52 | }
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| 53 | };
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| 54 |
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| 55 | Queue.prototype.onDone = function(cb) {
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| 56 | if (typeof cb === 'function') {
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| 57 | this.cbs.push(cb);
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| 58 | this._run();
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| 59 | }
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| 60 | };
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| 61 |
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| 62 | function done() {
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| 63 | this.pending--;
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| 64 | this._run();
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| 65 | }
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| 66 |
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| 67 | module.exports = Queue;
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