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43 lines
1.1 KiB
JavaScript
43 lines
1.1 KiB
JavaScript
module.exports = class Observable {
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on(event, listener) {
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this._addListener('_listeners', event, listener);
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}
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once(event, listener) {
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this._addListener('_onceListeners', event, listener);
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}
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async trigger(event, params) {
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await this._triggerEvent('_listeners', event, params);
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await this._triggerEvent('_onceListeners', event, params);
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// clear once-listeners
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if (this._onceListeners && this._onceListeners[event]) {
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delete this._onceListeners[event];
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}
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}
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_addListener(name, event, listener) {
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if (!this[name]) {
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this[name] = {};
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}
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if (!this[name][event]) {
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this[name][event] = [];
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}
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this[name][event].push(listener);
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}
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async _triggerEvent(name, event, params) {
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if (this[name] && this[name][event]) {
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for (let listener of this[name][event]) {
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await listener(params);
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}
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}
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}
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clearListeners() {
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this._listeners = {};
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this._onceListeners = {};
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}
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}
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