cb7fb85842
Changed index.js to add WebSockets to the server Changed index.html to add WebSockets to the client Install ws (web sockets) module
56 lines
1.0 KiB
JavaScript
56 lines
1.0 KiB
JavaScript
'use strict';
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const kDone = Symbol('kDone');
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const kRun = Symbol('kRun');
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/**
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* A very simple job queue with adjustable concurrency. Adapted from
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* https://github.com/STRML/async-limiter
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*/
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class Limiter {
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/**
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* Creates a new `Limiter`.
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*
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* @param {Number} [concurrency=Infinity] The maximum number of jobs allowed
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* to run concurrently
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*/
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constructor(concurrency) {
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this[kDone] = () => {
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this.pending--;
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this[kRun]();
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};
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this.concurrency = concurrency || Infinity;
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this.jobs = [];
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this.pending = 0;
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}
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/**
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* Adds a job to the queue.
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*
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* @param {Function} job The job to run
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* @public
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*/
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add(job) {
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this.jobs.push(job);
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this[kRun]();
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}
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/**
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* Removes a job from the queue and runs it if possible.
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*
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* @private
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*/
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[kRun]() {
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if (this.pending === this.concurrency) return;
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if (this.jobs.length) {
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const job = this.jobs.shift();
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this.pending++;
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job(this[kDone]);
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}
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}
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}
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module.exports = Limiter;
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