40 lines
785 B
JavaScript
40 lines
785 B
JavaScript
class Event {
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constructor(name) {
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this.name = name
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this.firings = []
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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 handlers must be functions.')
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}
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this.subscriptions.push(handler)
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}
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async fire(...args) {
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this.firings.push({ 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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class EventBusService {
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constructor() {
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this._events = {}
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}
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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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const event_bus = new EventBusService()
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export { event_bus, Event }
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