Comments (5)
I ended up doing a custom implementation with eventemitter2 because I needed wildcard support. I thought I'd share in-case it helps somebody.
You could probably improve it with decorators, like remove the need for the abstract attach
method but I didn't want to spend that much time on it and this meets my needs fine.
Here is the pub/sub classes:
import { EventEmitter2 } from "eventemitter2";
export interface IEventPublisherArgs {
subscribers: EventSubscriber[];
}
export class EventPublisher {
private emitter: EventEmitter2;
constructor(args: IEventPublisherArgs) {
this.emitter = new EventEmitter2({ wildcard: true, delimiter: "." });
const bus: IEventBus = {
subscribe: (id, cb) => {
this.emitter.on(id, cb);
}
};
for (const subscriber of args.subscribers) {
subscriber.attach(bus);
}
}
publish(event: PublishEvent) {
this.emitter.emit(event.id, event);
}
}
export class PublishEvent {
constructor(public id: string) {}
}
export type SubscribeListenerFunction = (event: PublishEvent) => void;
export type SubscribeFunction = (
id: string,
cb: SubscribeListenerFunction
) => void;
export interface IEventBus {
subscribe: SubscribeFunction;
}
export abstract class EventSubscriber {
abstract attach(bus: IEventBus): void;
}
Here is a basic example on how it is used (w/ dependency injection):
import { Container } from "typedi";
export class IntegrationConnectedEvent extends PublishEvent {
constructor(public payload: any) {
super("integration.connected");
}
}
export class IntegrationSubscriber extends EventSubscriber {
attach(bus: IEventBus) {
bus.subscribe(
"integration.connected",
this.onIntegrationConnectedEvent
);
}
async onIntegrationConnectedEvent(event: PublishEvent) {
if (event instanceof IntegrationConnectedEvent) {
console.log(event.payload);
}
}
}
Container.set("publisher", new EventPublisher({ subscribers: [new IntegrationSubscriber()] }));
const publisher = Container.get("publisher");
publisher.publish(new IntegrationConnectedEvent("Hello World!"));
// Console output: Hello World!
from bulletproof-nodejs.
You might want to check out https://github.com/KeesCBakker/Strongly-Typed-Events-for-TypeScript
I'm in the process of replacing event-dispatch with it for the project I'm currently working on.
from bulletproof-nodejs.
Oh well, that's sad I liked that package :(
I will try to find an alternative, or write a service that does the same
from bulletproof-nodejs.
I just found about that package as well, and it looks awesome. Hopefully there are some similar alternatives out there. If you decide to create a similar service, and if you accept PRs, I will be happy to collaborate :)
from bulletproof-nodejs.
I just found this package which I am going to use in my project as an alternative.
https://github.com/j/type-events
I particularly like how events are dispatched as class instances so you can depend on the arguments that are passed to the subscribers.
from bulletproof-nodejs.
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