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91 lines
4.2 KiB
91 lines
4.2 KiB
2 months ago
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/*
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This is a simple promise queue that allows you to limit the number of concurrent promises
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that are running at any given time. It's used to limit the number of concurrent
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prefetch requests that are being made to the server but could be used for other
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things as well.
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*/ "use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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Object.defineProperty(exports, "PromiseQueue", {
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enumerable: true,
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get: function() {
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return PromiseQueue;
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}
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});
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const _class_private_field_loose_base = require("@swc/helpers/_/_class_private_field_loose_base");
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const _class_private_field_loose_key = require("@swc/helpers/_/_class_private_field_loose_key");
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var _maxConcurrency = /*#__PURE__*/ _class_private_field_loose_key._("_maxConcurrency"), _runningCount = /*#__PURE__*/ _class_private_field_loose_key._("_runningCount"), _queue = /*#__PURE__*/ _class_private_field_loose_key._("_queue"), _processNext = /*#__PURE__*/ _class_private_field_loose_key._("_processNext");
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class PromiseQueue {
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enqueue(promiseFn) {
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let taskResolve;
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let taskReject;
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const taskPromise = new Promise((resolve, reject)=>{
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taskResolve = resolve;
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taskReject = reject;
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});
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const task = async ()=>{
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try {
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_class_private_field_loose_base._(this, _runningCount)[_runningCount]++;
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const result = await promiseFn();
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taskResolve(result);
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} catch (error) {
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taskReject(error);
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} finally{
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_class_private_field_loose_base._(this, _runningCount)[_runningCount]--;
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_class_private_field_loose_base._(this, _processNext)[_processNext]();
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}
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};
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const enqueueResult = {
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promiseFn: taskPromise,
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task
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};
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// wonder if we should take a LIFO approach here
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_class_private_field_loose_base._(this, _queue)[_queue].push(enqueueResult);
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_class_private_field_loose_base._(this, _processNext)[_processNext]();
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return taskPromise;
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}
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bump(promiseFn) {
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const index = _class_private_field_loose_base._(this, _queue)[_queue].findIndex((item)=>item.promiseFn === promiseFn);
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if (index > -1) {
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const bumpedItem = _class_private_field_loose_base._(this, _queue)[_queue].splice(index, 1)[0];
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_class_private_field_loose_base._(this, _queue)[_queue].unshift(bumpedItem);
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_class_private_field_loose_base._(this, _processNext)[_processNext](true);
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}
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}
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constructor(maxConcurrency = 5){
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Object.defineProperty(this, _processNext, {
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value: processNext
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});
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Object.defineProperty(this, _maxConcurrency, {
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writable: true,
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value: void 0
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});
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Object.defineProperty(this, _runningCount, {
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writable: true,
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value: void 0
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});
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Object.defineProperty(this, _queue, {
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writable: true,
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value: void 0
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});
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_class_private_field_loose_base._(this, _maxConcurrency)[_maxConcurrency] = maxConcurrency;
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_class_private_field_loose_base._(this, _runningCount)[_runningCount] = 0;
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_class_private_field_loose_base._(this, _queue)[_queue] = [];
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}
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}
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function processNext(forced) {
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if (forced === void 0) forced = false;
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if ((_class_private_field_loose_base._(this, _runningCount)[_runningCount] < _class_private_field_loose_base._(this, _maxConcurrency)[_maxConcurrency] || forced) && _class_private_field_loose_base._(this, _queue)[_queue].length > 0) {
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var _class_private_field_loose_base__queue_shift;
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(_class_private_field_loose_base__queue_shift = _class_private_field_loose_base._(this, _queue)[_queue].shift()) == null ? void 0 : _class_private_field_loose_base__queue_shift.task();
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}
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}
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if ((typeof exports.default === 'function' || (typeof exports.default === 'object' && exports.default !== null)) && typeof exports.default.__esModule === 'undefined') {
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Object.defineProperty(exports.default, '__esModule', { value: true });
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Object.assign(exports.default, exports);
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module.exports = exports.default;
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}
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//# sourceMappingURL=promise-queue.js.map
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