50 lines
952 B
JavaScript
50 lines
952 B
JavaScript
"use strict";
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/**
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* This is apparently a bit like a Jquery deferred, hence the name
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*/
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class Deferred {
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constructor(Promise) {
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this._state = Deferred.PENDING;
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this._resolve = undefined;
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this._reject = undefined;
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this._promise = new Promise((resolve, reject) => {
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this._resolve = resolve;
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this._reject = reject;
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});
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}
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get state() {
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return this._state;
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}
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get promise() {
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return this._promise;
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}
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reject(reason) {
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if (this._state !== Deferred.PENDING) {
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return;
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}
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this._state = Deferred.REJECTED;
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this._reject(reason);
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}
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resolve(value) {
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if (this._state !== Deferred.PENDING) {
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return;
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}
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this._state = Deferred.FULFILLED;
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this._resolve(value);
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}
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}
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// TODO: should these really live here? or be a seperate 'state' enum
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Deferred.PENDING = "PENDING";
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Deferred.FULFILLED = "FULFILLED";
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Deferred.REJECTED = "REJECTED";
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module.exports = Deferred;
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