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* The copyright in this software is being made available under the BSD License,
* included below. This software may be subject to other third party and contributor
* rights, including patent rights, and no such rights are granted under this license.
*
* Copyright (c) 2013, Dash Industry Forum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * Neither the name of Dash Industry Forum nor the names of its
* contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
import FactoryMaker from './FactoryMaker.js';
import MediaPlayerEvents from '../streaming/MediaPlayerEvents.js';
const EVENT_PRIORITY_LOW = 0;
const EVENT_PRIORITY_HIGH = 5000;
function EventBus() {
let handlers = {};
function _commonOn(type, listener, scope, options = {}, executeOnlyOnce = false) {
if (!type) {
throw new Error('event type cannot be null or undefined');
}
if (!listener || typeof (listener) !== 'function') {
throw new Error('listener must be a function: ' + listener);
}
let priority = options.priority || EVENT_PRIORITY_LOW;
if (getHandlerIdx(type, listener, scope) >= 0) {
return;
}
handlers[type] = handlers[type] || [];
const handler = {
callback: listener,
scope,
priority,
executeOnlyOnce
};
if (scope && scope.getStreamId) {
handler.streamId = scope.getStreamId();
}
if (scope && scope.getType) {
handler.mediaType = scope.getType();
}
if (options && options.mode) {
handler.mode = options.mode;
}
const inserted = handlers[type].some((item, idx) => {
if (item && priority > item.priority) {
handlers[type].splice(idx, 0, handler);
return true;
}
});
if (!inserted) {
handlers[type].push(handler);
}
}
function on(type, listener, scope, options = {}) {
_commonOn(type, listener, scope, options);
}
function once(type, listener, scope, options = {}) {
_commonOn(type, listener, scope, options, true)
}
function off(type, listener, scope) {
if (!type || !listener || !handlers[type]) {
return;
}
const idx = getHandlerIdx(type, listener, scope);
if (idx < 0) {
return;
}
handlers[type][idx] = null;
}
function trigger(type, payload = {}, filters = {}) {
if (!type || !handlers[type]) {
return;
}
payload = payload || {};
if (payload.hasOwnProperty('type')) {
throw new Error('\'type\' is a reserved word for event dispatching');
}
payload.type = type;
if (filters.streamId) {
payload.streamId = filters.streamId;
}
if (filters.mediaType) {
payload.mediaType = filters.mediaType;
}
const handlersToRemove = [];
handlers[type]
.filter((handler) => {
if (!handler) {
return false;
}
Iif (filters.streamId && handler.streamId && handler.streamId !== filters.streamId) {
return false;
}
Iif (filters.mediaType && handler.mediaType && handler.mediaType !== filters.mediaType) {
return false;
}
// This is used for dispatching DASH events. By default we use the onStart mode. Consequently we filter everything that has a non matching mode and the onReceive events for handlers that did not specify a mode.
if ((filters.mode && handler.mode && handler.mode !== filters.mode) || (!handler.mode && filters.mode && filters.mode === MediaPlayerEvents.EVENT_MODE_ON_RECEIVE)) {
return false;
}
return true;
})
.forEach((handler) => {
handler && handler.callback.call(handler.scope, payload);
Iif (handler.executeOnlyOnce) {
handlersToRemove.push(handler);
}
});
handlersToRemove.forEach((handler) => {
off(type, handler.callback, handler.scope);
})
}
function getHandlerIdx(type, listener, scope) {
let idx = -1;
if (!handlers[type]) {
return idx;
}
handlers[type].some((item, index) => {
if (item && item.callback === listener && (!scope || scope === item.scope)) {
idx = index;
return true;
}
});
return idx;
}
function reset() {
handlers = {};
}
const instance = {
on,
once,
off,
trigger,
reset
};
return instance;
}
EventBus.__dashjs_factory_name = 'EventBus';
const factory = FactoryMaker.getSingletonFactory(EventBus);
factory.EVENT_PRIORITY_LOW = EVENT_PRIORITY_LOW;
factory.EVENT_PRIORITY_HIGH = EVENT_PRIORITY_HIGH;
FactoryMaker.updateSingletonFactory(EventBus.__dashjs_factory_name, factory);
export default factory;
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