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export default class EventEmitter {
constructor() {
this._listeners = {};
this._once = {};
}
/**
* @param {String|String[]} event
* @param {Object} data
*
* @return {Promise<void>}
*/
async emit(event, data) {
if(Array.isArray(event)) {
event.forEach((event) => {this.emit(event, data);});
return;
}
await this._notifyListeners(event, data);
await this._notifyOnce(event, data);
}
/**
* @param {String|String[]} event
* @param {Function} callback
*
* @return EventEmitter
*/
on(event, callback) {
if(Array.isArray(event)) {
event.forEach((event) => {this.on(event, callback);});
return this;
}
if(!this._listeners.hasOwnProperty(event)) {
this._listeners[event] = [];
}
this._listeners[event].push(callback);
return this;
}
/**
* @param {String|String[]} event
* @param {Function} callback
*
* @return EventEmitter
*/
off(event, callback) {
if(Array.isArray(event)) {
event.forEach((event) => {this.off(event, callback);});
return this;
}
if(!this._listeners.hasOwnProperty(event)) {
return this;
}
for(let i = 0; i < this._listeners[event].length; i++) {
if(this._listeners[event][i] === callback) {
this._listeners[event].splice(i, 1);
i--;
}
}
return this;
}
/**
* @param {String} event
* @param {Function} callback
*
* @return EventEmitter
*/
once(event, callback) {
if(!this._once.hasOwnProperty(event)) {
this._once[event] = [];
}
this._once[event].push(callback);
return this;
}
/**
* @param {String} event
* @param {Object} data
* @return {Promise<void>}
* @private
*/
async _notifyListeners(event, data) {
if(!this._listeners.hasOwnProperty(event)) {
return;
}
for(let callback of this._listeners[event]) {
try {
await callback(data);
} catch(e) {
console.error(e);
}
}
}
/**
* @param {String} event
* @param {Object} data
* @return {Promise<void>}
* @private
*/
async _notifyOnce(event, data) {
if(!this._once.hasOwnProperty(event)) {
return;
}
let callback;
while(callback = this._once[event].pop()) {
try {
await callback(data);
} catch(e) {
console.error(e);
}
}
}
}
|
