EventEmitter.js

module.exports = Class('Lente.System.EventEmitter', {

    'private string name'       : '',
    'private object listeners'  : {},
    'private object last_event' : {},

    /**
     * @constructor
     * @param {String} name
     */
    construct: function (name)
    {
        this.name      = name || 'Untitled Event Emitter';
        this.listeners = [];
    },

    subscribe: function (callback, priority, run_last)
    {
        priority = parseInt(priority || 100);
        callback = callback || function () {};

        this.listeners.push({
            func: callback,
            prio: priority
        });

        this.listeners.sort((a, b) => {
            return a.prio > b.prio ? 1 : (a.prio < b.prio ? -1 : 0);
        });

        if (run_last === true) {
            callback(this.last_event);
        }
    },

    /**
     * Executes subscribed listeners. Any arguments passed to this function are placed in
     *
     * @param {Object} e_args
     */
    emit: function (e_args)
    {
        let e = new Lente.System.Event(this.name, e_args),
            c = [];

        this.last_event = e;
        this.listeners.forEach((listener) => {
            listener.func(e);
        });
    }
});