nodejs-event-driven/lib/main/infra/event-bus/memory/memory-event-bus.service.js

NodeJS agnostic event driven with EventEmitter support

import { EventEmitter } from 'node:events';
import { BaseEventBusService } from '../../../base-event-bus.service.js';
export default class MemoryEventBusService extends BaseEventBusService {
    #logger;
    #emitDelay;
    #eventEmitter;
    constructor(config) {
        super();
        this.#logger = config.logger;
        this.#emitDelay = config.eventBusMemoryEmitDelay;
        this.#eventEmitter = new EventEmitter();
    }
    on(eventName, listener) {
        this.#logger?.debug(`register listener for event: ${eventName}`);
        this.#eventEmitter.on(eventName, listener);
    }
    once(eventName, listener) {
        this.#logger?.debug(`register once listener for event: ${eventName}`);
        this.#eventEmitter.once(eventName, listener);
    }
    off(eventName, listener) {
        this.#logger?.debug(`unregister listener for event: ${eventName}`);
        this.#eventEmitter.off(eventName, listener);
    }
    send(eventName, data) {
        if (this.#emitDelay) {
            this.#logger?.debug(`will send event later (${this.#emitDelay}ms): ${eventName} with ${String(data)}`);
            setTimeout(() => {
                this.#eventEmitter.emit(eventName, data);
            }, this.#emitDelay);
            return;
        }
        this.#logger?.debug(`sending event: ${eventName} with ${String(data)}`);
        process.nextTick(() => {
            this.#eventEmitter.emit(eventName, data);
        });
    }
    sendAndWait(sendEventName, successEventName, errorEventName, data) {
        this.#logger?.debug(`sending event ${sendEventName} and waiting for event ${successEventName}…`);
        return super.sendAndWait(sendEventName, successEventName, errorEventName, data);
    }
    start() {
        return Promise.resolve();
    }
    stop() {
        this.#eventEmitter.removeAllListeners();
        return Promise.resolve();
    }
}
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