57 lines
1.7 KiB
JavaScript
57 lines
1.7 KiB
JavaScript
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/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*
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*/
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'use strict';
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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var Deferred = require('./Deferred');
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var invariant = require('./invariant');
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/**
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* A map of asynchronous values that can be get or set in any order. Unlike a
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* normal map, setting the value for a particular key more than once throws.
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* Also unlike a normal map, a key can either be resolved or rejected.
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*/
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var PromiseMap = function () {
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function PromiseMap() {
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_classCallCheck(this, PromiseMap);
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this._deferred = {};
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}
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PromiseMap.prototype.get = function get(key) {
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return getDeferred(this._deferred, key).getPromise();
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};
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PromiseMap.prototype.resolveKey = function resolveKey(key, value) {
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var entry = getDeferred(this._deferred, key);
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!!entry.isSettled() ? process.env.NODE_ENV !== 'production' ? invariant(false, 'PromiseMap: Already settled `%s`.', key) : invariant(false) : void 0;
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entry.resolve(value);
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};
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PromiseMap.prototype.rejectKey = function rejectKey(key, reason) {
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var entry = getDeferred(this._deferred, key);
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!!entry.isSettled() ? process.env.NODE_ENV !== 'production' ? invariant(false, 'PromiseMap: Already settled `%s`.', key) : invariant(false) : void 0;
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entry.reject(reason);
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};
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return PromiseMap;
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}();
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function getDeferred(entries, key) {
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if (!entries.hasOwnProperty(key)) {
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entries[key] = new Deferred();
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}
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return entries[key];
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}
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module.exports = PromiseMap;
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