comet.client.js

/**
 * @since 04.10.13 11:56
 * @author Arsen Abdusalamov
 * @param {} $ jQuery
 * @param {} window
 * @returns void
 */
(function ($, window) {
    "use strict";
    window.CometClient = function () {
        var me = this,
            requestCount = 0,
            lastData = {};

        this.longPolling = function (url, successCallback) {
            requestCount++;
            $.ajax({
                url: url + (requestCount === 1 ? '&first=1' : ''),
                success: function (data) {
                    if (JSON.stringify(lastData) !== JSON.stringify(data)) {
                        setTimeout(function () {
                            successCallback(data);
                        }, 1000);
                        lastData = data;
                        console.log('not equal');
                    } else {
                        console.log('equal');
                    }
                    setTimeout(function () {
                        me.longPolling(url, successCallback);
                    }, 1500);
                },
                error: function () {
                    setTimeout(function () {
                        me.longPolling(url, successCallback);
                    }, 5000);
                },
                global: false
            });
        };
    };

})(window.jQuery, window);