mirror of https://bitbucket.org/ausocean/av.git
106 lines
2.9 KiB
JavaScript
106 lines
2.9 KiB
JavaScript
/*
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AUTHOR
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Trek Hopton <trek@ausocean.org>
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LICENSE
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This file is Copyright (C) 2020 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License in gpl.txt.
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If not, see http://www.gnu.org/licenses.
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For hls.js Copyright notice and license, see LICENSE file.
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*/
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/*
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*
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* All objects in the event handling chain should inherit from this class
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*
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*/
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import Event from './events.js';
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const FORBIDDEN_EVENT_NAMES = {
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'hlsEventGeneric': true,
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'hlsHandlerDestroying': true,
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'hlsHandlerDestroyed': true
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};
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class EventHandler {
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constructor(hls, ...events) {
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this.hls = hls;
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this.onEvent = this.onEvent.bind(this);
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this.handledEvents = events;
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this.useGenericHandler = true;
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this.registerListeners();
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}
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destroy() {
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this.onHandlerDestroying();
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this.unregisterListeners();
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this.onHandlerDestroyed();
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}
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onHandlerDestroying() { }
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onHandlerDestroyed() { }
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isEventHandler() {
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return typeof this.handledEvents === 'object' && this.handledEvents.length && typeof this.onEvent === 'function';
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}
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registerListeners() {
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if (this.isEventHandler()) {
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this.handledEvents.forEach(function (event) {
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if (FORBIDDEN_EVENT_NAMES[event]) {
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throw new Error('Forbidden event-name: ' + event);
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}
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this.hls.on(event, this.onEvent);
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}, this);
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}
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}
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unregisterListeners() {
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if (this.isEventHandler()) {
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this.handledEvents.forEach(function (event) {
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this.hls.off(event, this.onEvent);
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}, this);
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}
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}
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/**
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* arguments: event (string), data (any)
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*/
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onEvent(event, data) {
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this.onEventGeneric(event, data);
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}
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onEventGeneric(event, data) {
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let eventToFunction = function (event, data) {
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let funcName = 'on' + event.replace('hls', '');
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if (typeof this[funcName] !== 'function') {
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throw new Error(`Event ${event} has no generic handler in this ${this.constructor.name} class (tried ${funcName})`);
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}
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return this[funcName].bind(this, data);
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};
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try {
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eventToFunction.call(this, event, data).call();
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} catch (err) {
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console.error(`An internal error happened while handling event ${event}. Error message: "${err.message}". Here is a stacktrace:`, err);
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this.hls.trigger(Event.ERROR, { type: ErrorTypes.OTHER_ERROR, details: ErrorDetails.INTERNAL_EXCEPTION, fatal: false, event: event, err: err });
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}
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}
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}
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export default EventHandler;
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