journaly/dist/source/journaly/publisherSubscriberWithMemory.js

A simple pub-sub library project

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.PublisherSubscriberWithMemory = void 0;
const publisherSubscriber_1 = require("./publisherSubscriber");
class PublisherSubscriberWithMemory extends publisherSubscriber_1.PublisherSubscriber {
    constructor() {
        super();
        this.oldData = {};
    }
    getTopics() {
        const topics = [];
        let newProps = Object.getOwnPropertyNames(this.oldData);
        for (const prop of newProps) {
            if (!topics.includes(prop))
                topics.push(prop);
        }
        newProps = Object.getOwnPropertyNames(this.subscribers);
        for (const prop of newProps) {
            if (!topics.includes(prop))
                topics.push(prop);
        }
        return topics;
    }
    async subscribe(subscriber, topic) {
        try {
            await super.subscribe(subscriber, topic);
            return Promise.all(this.oldData[topic].map((params) => subscriber(...params)));
        }
        catch (error) {
            return new Promise((resolve) => {
                resolve([]);
            });
        }
    }
    async publish(topic, ...params) {
        this.checkTopic(topic);
        const promises = Promise.all(this.subscribers[topic].map((subscriber) => {
            return subscriber(...params);
        }));
        this.oldData[topic].push(params);
        return promises;
    }
    checkTopic(topic) {
        if (!this.subscribers[topic]) {
            this.subscribers[topic] = [];
            this.oldData[topic] = [];
        }
    }
}
exports.PublisherSubscriberWithMemory = PublisherSubscriberWithMemory;
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