@ribajs/shopify
Version:
Shopify extension for Riba.js
203 lines • 15.2 kB
JavaScript
import { PriorityQueue } from "./priority-queue.service.js";
export class PQueue {
queue = new PriorityQueue();
_carryoverConcurrencyCount;
_isIntervalIgnored;
_intervalCount = 0;
_intervalCap;
_interval;
_intervalId;
_intervalEnd = 0;
_timeoutId;
_pendingCount = 0;
_concurrency;
_isPaused;
_resolveEmpty;
_resolveIdle;
constructor(options) {
options = Object.assign({
carryoverConcurrencyCount: false,
intervalCap: Infinity,
interval: 0,
concurrency: Infinity,
autoStart: true,
queueClass: PriorityQueue,
}, options);
if (!(typeof options.concurrency === "number" && options.concurrency >= 1)) {
throw new TypeError(`Expected \`concurrency\` to be a number from 1 and up, got \`${options.concurrency}\` (${typeof options.concurrency})`);
}
if (!(typeof options.intervalCap === "number" && options.intervalCap >= 1)) {
throw new TypeError(`Expected \`intervalCap\` to be a number from 1 and up, got \`${options.intervalCap}\` (${typeof options.intervalCap})`);
}
if (!(typeof options.interval === "number" &&
Number.isFinite(options.interval) &&
options.interval >= 0)) {
throw new TypeError(`Expected \`interval\` to be a finite number >= 0, got \`${options.interval}\` (${typeof options.interval})`);
}
this._carryoverConcurrencyCount = options.carryoverConcurrencyCount;
this._isIntervalIgnored =
options.intervalCap === Infinity || options.interval === 0;
this._intervalCount = 0;
this._intervalCap = options.intervalCap;
this._interval = options.interval;
this._intervalId = undefined;
this._intervalEnd = 0;
this._timeoutId = null;
this.queue = new options.queueClass();
this._pendingCount = 0;
this._concurrency = options.concurrency;
this._isPaused = options.autoStart === false;
this._resolveEmpty = () => { };
this._resolveIdle = () => { };
}
add(fn, options) {
return new Promise((resolve, reject) => {
const run = () => {
this._pendingCount++;
this._intervalCount++;
try {
Promise.resolve(fn()).then((val) => {
resolve(val);
this._next();
}, (err) => {
reject(err);
this._next();
});
}
catch (err) {
reject(err);
this._next();
}
};
this.queue.enqueue(run, options);
this._tryToStartAnother();
});
}
addAll(fns, options) {
return Promise.all(fns.map((fn) => this.add(fn, options)));
}
start() {
if (!this._isPaused) {
return;
}
this._isPaused = false;
while (this._tryToStartAnother()) { }
}
pause() {
this._isPaused = true;
}
clear() {
this.queue = new PriorityQueue();
}
onEmpty() {
if (this.queue.size === 0) {
return Promise.resolve();
}
return new Promise((resolve) => {
const existingResolve = this._resolveEmpty;
this._resolveEmpty = () => {
existingResolve();
resolve();
};
});
}
onIdle() {
if (this._pendingCount === 0 && this.queue.size === 0) {
return Promise.resolve();
}
return new Promise((resolve) => {
const existingResolve = this._resolveIdle;
this._resolveIdle = () => {
existingResolve();
resolve();
};
});
}
get _doesIntervalAllowAnother() {
return this._isIntervalIgnored || this._intervalCount < this._intervalCap;
}
get _doesConcurrentAllowAnother() {
return this._pendingCount < this._concurrency;
}
_next() {
this._pendingCount--;
this._tryToStartAnother();
}
_resolvePromises() {
this._resolveEmpty();
this._resolveEmpty = () => { };
if (this._pendingCount === 0) {
this._resolveIdle();
this._resolveIdle = () => { };
}
}
_onResumeInterval() {
this._onInterval();
this._initializeIntervalIfNeeded();
this._timeoutId = null;
}
_intervalPaused() {
const now = Date.now();
if (typeof this._intervalId === undefined) {
const delay = this._intervalEnd - now;
if (delay < 0) {
this._intervalCount = this._carryoverConcurrencyCount
? this._pendingCount
: 0;
}
else {
if (this._timeoutId === null) {
this._timeoutId = setTimeout(() => this._onResumeInterval(), delay);
}
return true;
}
}
return false;
}
_tryToStartAnother() {
if (this.queue.size === 0) {
clearInterval(this._intervalId);
this._intervalId = undefined;
this._resolvePromises();
return false;
}
if (!this._isPaused) {
const canInitializeInterval = !this._intervalPaused();
if (this._doesIntervalAllowAnother && this._doesConcurrentAllowAnother) {
this.queue.dequeue()();
if (canInitializeInterval) {
this._initializeIntervalIfNeeded();
}
return true;
}
}
return false;
}
_initializeIntervalIfNeeded() {
if (this._isIntervalIgnored || this._intervalId !== null) {
return;
}
this._intervalId = setInterval(() => this._onInterval(), this._interval);
this._intervalEnd = Date.now() + this._interval;
}
_onInterval() {
if (this._intervalCount === 0 && this._pendingCount === 0) {
clearInterval(this._intervalId);
this._intervalId = undefined;
}
this._intervalCount = this._carryoverConcurrencyCount
? this._pendingCount
: 0;
while (this._tryToStartAnother()) { }
}
get size() {
return this.queue.size;
}
get pending() {
return this._pendingCount;
}
get isPaused() {
return this._isPaused;
}
}
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