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chenyc

2025-02-12 ea42ff3ebee1eeb3fb29423aa848a249441db81c

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