46 lines
1.0 KiB
JavaScript
46 lines
1.0 KiB
JavaScript
class Subscribable {
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constructor() {
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this.events = {
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addSelf: [],
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editSelf: [],
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removeSelf: [],
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changeSelf: [],
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};
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this.eventDeps = {
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addSelf: ["changeSelf"],
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editSelf: ["changeSelf"],
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removeSelf: ["changeSelf"],
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changeSelf: [],
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};
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}
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subscribe(event, callback) {
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if (this.events[event]) {
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this.events[event].push(callback);
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} else {
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throw new Error(
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`Cannot subscribe to non-existent event ${event}, available events are: ${Object.keys(
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this.events
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).join(", ")}`
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);
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}
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}
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unsubscribe(event, callback) {
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const index = this.events[event].indexOf(callback);
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if (index === -1)
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throw new Error(
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`Tried to remove a nonexisting subscription from event ${event}`
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);
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this.events[event].splice(index, 1);
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}
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broadcast(event, data) {
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this.eventDeps[event].concat(event).forEach((eventName) => {
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this.events[eventName].forEach((f) => f(event, data));
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});
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}
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}
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export { Subscribable };
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