@genexus/web-standard-functions/dist/lib-esm/pubSub/pubSub.js

GeneXus JavaScript standard functions library for web generators

import EventSubscription from "./pubSubscription";
import * as PubSubJs from "pubsub-js";
/**
 * Asynchronously publishes the message, passing the data to it's subscribers
 * @param topicName The topic name to publish the data
 * @param data  The data to pass to subscribers
 * @return Returns true if there are subscribers to the topic
 */
export const publish = (topicName, ...data) => {
    return PubSubJs.publish(normalizeTopicName(topicName), data);
};
/**
 * Subscribe to topic name. Automatically gets notified when someone publish to the topic name.
 * @param topicName The topic name to be subscribed.
 * @param handler The function to be called when someone publish to the topic name.
 * @param options Subscribe advanced options: such as subscribe only once to the topic.
 * @return Returns Subscription object
 */
export const subscribe = (topicName, handler, options) => {
    const subscribeWrapper = (handler) => {
        return function (topic, data) {
            handler.apply(this, data);
        };
    };
    topicName = normalizeTopicName(topicName);
    let token;
    if (options && options.once) {
        // @ts-ignore
        token = PubSubJs.subscribeOnce(topicName, subscribeWrapper(handler));
    }
    else {
        token = PubSubJs.subscribe(topicName, subscribeWrapper(handler));
    }
    return new EventSubscription(token);
};
/**
 * Cancel a specific subscription.
 * @param suscription The suscription object
 */
export const cancelTopic = (topicName) => {
    PubSubJs.unsubscribe(normalizeTopicName(topicName));
};
/**
 * Cancel a specific subscription.
 * @param suscription The suscription object
 */
export const cancelSubscription = (subscription) => {
    subscription.unsubscribe();
};
/**
 * Clears all subscribed events.
 */
export const cancelAllSubscriptions = () => {
    PubSubJs.clearAllSubscriptions();
};
const normalizeTopicName = (name) => {
    return name.toLocaleLowerCase();
};
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