@unchainedshop/events/lib/EventDirector.js

This package contains business logic for the event emitter abstraction layer

import { createLogger } from '@unchainedshop/logger';
const logger = createLogger('unchained:events');
const RegisteredEventsSet = new Set();
const RegisteredCallbacksSet = new Set();
let Adapter; // Public (customizable)
let HistoryAdapter; // (Per default: Core-events adapter to write into DB)
export const EventDirector = {
    registerEvents: (events) => {
        if (events.length) {
            events.forEach((e) => RegisteredEventsSet.add(e));
        }
    },
    getRegisteredEvents: () => {
        return Array.from(RegisteredEventsSet);
    },
    setEmitAdapter: (adapter) => {
        Adapter = adapter;
    },
    getEmitAdapter: () => Adapter,
    setEmitHistoryAdapter: (adapter) => {
        HistoryAdapter = adapter;
    },
    getEmitHistoryAdapter: () => HistoryAdapter,
    emit: async (eventName, data) => {
        if (!RegisteredEventsSet.has(eventName))
            throw new Error(`Event with ${eventName} is not registered`);
        const payload = data || {};
        Adapter?.publish(eventName, {
            payload,
        });
        HistoryAdapter?.publish(eventName, {
            payload,
        });
        logger.debug(`EventDirector -> Emitted ${eventName} with ${JSON.stringify(data)}`);
    },
    subscribe: (eventName, callback) => {
        const currentSubscription = `${eventName}${callback?.toString()}`; // used to avaoid registering the same event handler callback
        if (!RegisteredEventsSet.has(eventName))
            throw new Error(`Event with ${eventName} is not registered`);
        if (!RegisteredCallbacksSet.has(currentSubscription)) {
            Adapter?.subscribe(eventName, callback);
            HistoryAdapter?.subscribe(eventName, callback);
            RegisteredCallbacksSet.add(currentSubscription);
        }
    },
};
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