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43 lines
908 B
43 lines
908 B
export class Event {
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constructor(name) {
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this.name = name
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this.subscriptions = []
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}
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subscribe(handler) {
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if ( typeof handler !== 'function' ) {
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throw new TypeError('Event subscription handler must be a function')
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}
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this.subscriptions.push(handler)
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return () => this.subscriptions = this.subscriptions.filter(x => x !== handler)
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}
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async fire(...args) {
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return Promise.all(this.subscriptions.map(x => x(...args)))
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}
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}
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export class EventBus {
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static get() {
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if ( !this.instance ) {
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this.instance = new EventBus()
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}
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return this.instance
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}
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constructor() {
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this.events = []
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}
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/** @return Event */
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event(name) {
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if ( !this.events[name] ) {
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this.events[name] = new Event(name)
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}
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return this.events[name]
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}
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}
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