"use strict";
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/**
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* @license
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* Copyright 2019 Google Inc. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* =============================================================================
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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var util_1 = require("../util");
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/**
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* Monitor Promise.all progress, fire onProgress callback function.
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*
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* @param promises Promise list going to be monitored
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* @param onProgress Callback function. Fired when a promise resolved.
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* @param startFraction Optional fraction start. Default to 0.
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* @param endFraction Optional fraction end. Default to 1.
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*/
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function monitorPromisesProgress(promises, onProgress, startFraction, endFraction) {
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checkPromises(promises);
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startFraction = startFraction == null ? 0 : startFraction;
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endFraction = endFraction == null ? 1 : endFraction;
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checkFraction(startFraction, endFraction);
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var resolvedPromise = 0;
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var registerMonitor = function (promise) {
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promise.then(function (value) {
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var fraction = startFraction +
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++resolvedPromise / promises.length * (endFraction - startFraction);
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// pass fraction as parameter to callback function.
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onProgress(fraction);
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return value;
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});
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return promise;
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};
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function checkPromises(promises) {
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util_1.assert(promises != null && Array.isArray(promises) && promises.length > 0, function () { return 'promises must be a none empty array'; });
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}
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function checkFraction(startFraction, endFraction) {
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util_1.assert(startFraction >= 0 && startFraction <= 1, function () { return "Progress fraction must be in range [0, 1], but " +
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("got startFraction " + startFraction); });
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util_1.assert(endFraction >= 0 && endFraction <= 1, function () { return "Progress fraction must be in range [0, 1], but " +
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("got endFraction " + endFraction); });
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util_1.assert(endFraction >= startFraction, function () { return "startFraction must be no more than endFraction, but " +
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("got startFraction " + startFraction + " and endFraction ") +
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("" + endFraction); });
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}
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return Promise.all(promises.map(registerMonitor));
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}
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exports.monitorPromisesProgress = monitorPromisesProgress;
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//# sourceMappingURL=progress.js.map
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