@amxchange/grid-view-web-client/src/services/EventService.js

amxchange grid view framework web client in react ( a module extracted from existing jax )

var topics = {};
var hOP = topics.hasOwnProperty;

const EventService = {
    subscribe: function (topic, listener) {
        // Create the topic's object if not yet created
        if (!hOP.call(topics, topic)) topics[topic] = [];

        // Add the listener to queue
        var index = topics[topic].push(listener) - 1;

        // Provide handle back for removal of topic
        return {
            remove: function () {
                delete topics[topic][index];
            }
        };
    },
    publish: function (topic, info) {
        // If the topic doesn't exist, or there's no listeners in queue, just leave
        if (!hOP.call(topics, topic)) return;

        // Cycle through topics queue, fire!
        topics[topic].forEach(function (item) {
            item(info != undefined ? info : {});
        });
    }
};

export default EventService;