material-motion-runtime/dist/TokenGenerator.js

The core architecture for Material Motion.

/** @license
 *  Copyright 2016 - present The Material Motion Authors. 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.
 */
"use strict";
class TokenGenerator {
    constructor({ onTokenCountChange }) {
        this._tokenCount = 0;
        if (!onTokenCountChange) {
            throw new Error(`TokenGenerator requires an onTokenCountChange listener to be passed in`);
        }
        this._onTokenCountChange = onTokenCountChange;
    }
    /**
     *  Generates a token, representing a task waiting to be completed.
     *
     *  Call the returned terminate function when the task is complete.
     */
    generateToken() {
        let terminated = false;
        this._updateTokenCount(+1);
        return {
            terminate: () => {
                if (terminated) {
                    throw new Error(`This token has already been terminated`);
                }
                else {
                    terminated = true;
                    this._updateTokenCount(-1);
                }
            }
        };
    }
    _updateTokenCount(delta) {
        this._tokenCount += delta;
        this._onTokenCountChange({ count: this._tokenCount });
    }
}
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = TokenGenerator;
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