Utilizing the Queue Library from Async.js for downloading multiple assets with Appcelerator Titanium

app_snippet_1.js

//
// https://github.com/caolan/async
//
var async = require('async');

// this function will be called for each array element
function process(_url, _processCallback) {

    // download the file
    get_file(_url, function(_resp) {
        if (!_resp.error) {
            Ti.API.debug('file successfully downloaded ' + _url);
        } else {
            Ti.API.error('Error Downloading file ' + _url);
            Ti.API.error('Error Message ' + _resp.error);
        }
        _processCallback(_resp.error);
    }, null);
};

// create the queue
var myQueue = async.queue(process, 3);

// called when the process is completed
myQueue.drain = function() {
    Ti.API.info('all items have been processed');
};

// START THE PROCESS
// processes all of the models in the collection
myQueue.push(files_arr, function(_err) {
    _err && Ti.API.error("error processing queued model " + JSON.stringify(_err));

});