Source: view4js/events/EventBroadcaster.js

/** 
 * @license
 * Copyright (c) 2019 Gaurang Lade
 * 
 * MIT License
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */


import EventChannel from './EventChannel';

/**
 *
 * 
 * EventBroadCaster
 */
class EventBroadCaster {


    /**
     * @description Singleton Static Class use to Broadcast Events in Application on Publish / Subscribe to Application Channel and Navigation Channel
     * @memberof EventBroadCaster
     */
    constructor() {
        if (!EventBroadCaster.instance) {
            EventBroadCaster.instance = this;
            this.appEvtChannel = new EventChannel("APPLICATIONEVENT");
            this.navEvtChannel = new EventChannel("NAVIGATIONEVENT");
        }
        return EventBroadCaster.instance;

    }


    /**
     * @description Returns Application Event Channel Instance
     * @returns {Object}
     * @readonly
     * @memberof EventBroadCaster
     */
    get appEventChannel() {
        return this.appEvtChannel;
    }


    /**
     * @description Returns Navigation Event Channel Instance
     * @returns {Object} 
     * @readonly
     * @memberof EventBroadCaster
     */
    get navEventChannel() {
        return this.navEvtChannel;
    }



}

const MessageBus = new EventBroadCaster();
// prevents new properties from being added to the object
Object.freeze(MessageBus);

export default MessageBus;