    /**
     * @class Ext.app.Application
     * @extend Ext.app.Controller
     *
     * Represents an Ext JS 4 application, which is typically a single page app using a {@link Ext.container.Viewport Viewport}.
     * A typical Ext.app.Application might look like this:
     *
     *     Ext.application({
     *         name: 'MyApp',
     *         launch: function() {
     *             Ext.create('Ext.container.Viewport', {
     *                 items: {
     *                     html: 'My App'
     *                 }
     *             });
     *         }
     *     });
     *
     * This does several things. First it creates a global variable called 'MyApp' - all of your Application's classes (such
     * as its Models, Views and Controllers) will reside under this single namespace, which drastically lowers the chances
     * of colliding global variables.
     *
     * When the page is ready and all of your JavaScript has loaded, your Application's {@link #launch} function is called,
     * at which time you can run the code that starts your app. Usually this consists of creating a Viewport, as we do in
     * the example above.
     *
     * <u>Telling Application about the rest of the app</u>
     *
     * Because an Ext.app.Application represents an entire app, we should tell it about the other parts of the app - namely
     * the Models, Views and Controllers that are bundled with the application. Let's say we have a blog management app; we
     * might have Models and Controllers for Posts and Comments, and Views for listing, adding and editing Posts and Comments.
     * Here's how we'd tell our Application about all these things:
     *
     *     Ext.application({
     *         name: 'Blog',
     *         models: ['Post', 'Comment'],
     *         controllers: ['Posts', 'Comments'],
     *
     *         launch: function() {
     *             ...
     *         }
     *     });
     *
     * Note that we didn't actually list the Views directly in the Application itself. This is because Views are managed by
     * Controllers, so it makes sense to keep those dependencies there. The Application will load each of the specified
     * Controllers using the pathing conventions laid out in the <a href="../guide/application_architecture">application
     * architecture guide</a> - in this case expecting the controllers to reside in app/controller/Posts.js and
     * app/controller/Comments.js. In turn, each Controller simply needs to list the Views it uses and they will be
     * automatically loaded. Here's how our Posts controller like be defined:
     *
     *     Ext.define('MyApp.controller.Posts', {
     *         extend: 'Ext.app.Controller',
     *         views: ['posts.List', 'posts.Edit'],
     *
     *         //the rest of the Controller here
     *     });
     *
     * Because we told our Application about our Models and Controllers, and our Controllers about their Views, Ext JS will
     * automatically load all of our app files for us. This means we don't have to manually add script tags into our html
     * files whenever we add a new class, but more importantly it enables us to create a minimized build of our entire
     * application using the Ext JS 4 SDK Tools.
     *
     * For more information about writing Ext JS 4 applications, please see the
     * [application architecture guide](#/guide/application_architecture).
     *
     * @docauthor Ed Spencer
     */
    Ext.define('Ext.app.Application', {
        extend: 'Ext.app.Controller',

        requires: [
            'Ext.ModelManager',
            'Ext.data.Model',
            'Ext.data.StoreManager',
            'Ext.tip.QuickTipManager',
            'Ext.ComponentManager',
            'Ext.app.EventBus'
        ],

        /**
         * @cfg {String} name The name of your application. This will also be the namespace for your views, controllers
         * models and stores. Don't use spaces or special characters in the name.
         */

        /**
         * @cfg {Object} scope The scope to execute the {@link #launch} function in. Defaults to the Application
         * instance.
         */
        scope: undefined,

        /**
         * @cfg {Boolean} enableQuickTips True to automatically set up Ext.tip.QuickTip support (defaults to true)
         */
        enableQuickTips: true,

        /**
         * @cfg {String} defaultUrl When the app is first loaded, this url will be redirected to. Defaults to undefined
         */

        /**
         * @cfg {String} appFolder The path to the directory which contains all application's classes.
         * This path will be registered via {@link Ext.Loader#setPath} for the namespace specified in the {@link #name name} config.
         * Defaults to 'app'
         */
        appFolder: 'app',

        /**
         * @cfg {Boolean} autoCreateViewport True to automatically load and instantiate AppName.view.Viewport
         * before firing the launch function (defaults to false).
         */
        autoCreateViewport: false,

        /**
         * Creates new Application.
         * @param {Object} config (optional) Config object.
         */
        constructor: function(config) {
            config = config || {};
            Ext.apply(this, config);

            var requires = config.requires || [];

            Ext.Loader.setPath(this.name, this.appFolder);

            if (this.paths) {
                Ext.Object.each(this.paths, function(key, value) {
                    Ext.Loader.setPath(key, value);
                });
            }

            this.callParent(arguments);

            this.eventbus = Ext.create('Ext.app.EventBus');

            var controllers = Ext.Array.from(this.controllers),
                ln = controllers && controllers.length,
                i, controller;

            this.controllers = Ext.create('Ext.util.MixedCollection');

            if (this.autoCreateViewport) {
                requires.push(this.getModuleClassName('Viewport', 'view'));
            }

            for (i = 0; i < ln; i++) {
                requires.push(this.getModuleClassName(controllers[i], 'controller'));
            }

            Ext.require(requires);

            Ext.onReady(function() {
                for (i = 0; i < ln; i++) {
                    controller = this.getController(controllers[i]);
                    controller.init(this);
                }

                this.onBeforeLaunch.call(this);
            }, this);
        },

        control: function(selectors, listeners, controller) {
            this.eventbus.control(selectors, listeners, controller);
        },

        /**
         * Called automatically when the page has completely loaded. This is an empty function that should be
         * overridden by each application that needs to take action on page load
         * @property launch
         * @type Function
         * @param {String} profile The detected {@link #profiles application profile}
         * @return {Boolean} By default, the Application will dispatch to the configured startup controller and
         * action immediately after running the launch function. Return false to prevent this behavior.
         */
        launch: Ext.emptyFn,

        /**
         * @private
         */
        onBeforeLaunch: function() {
            if (this.enableQuickTips) {
                Ext.tip.QuickTipManager.init();
            }

            if (this.autoCreateViewport) {
                this.getView('Viewport').create();
            }

            this.launch.call(this.scope || this);
            this.launched = true;
            this.fireEvent('launch', this);

            this.controllers.each(function(controller) {
                controller.onLaunch(this);
            }, this);
        },

        getModuleClassName: function(name, type) {
            var namespace = Ext.Loader.getPrefix(name);

            if (namespace.length > 0 && namespace !== name) {
                return name;
            }

            return this.name + '.' + type + '.' + name;
        },

        getController: function(name) {
            var controller = this.controllers.get(name);

            if (!controller) {
                controller = Ext.create(this.getModuleClassName(name, 'controller'), {
                    application: this,
                    id: name
                });

                this.controllers.add(controller);
            }

            return controller;
        },

        getStore: function(name) {
            var store = Ext.StoreManager.get(name);

            if (!store) {
                store = Ext.create(this.getModuleClassName(name, 'store'), {
                    storeId: name
                });
            }

            return store;
        },

        getModel: function(model) {
            model = this.getModuleClassName(model, 'model');

            return Ext.ModelManager.getModel(model);
        },

        getView: function(view) {
            view = this.getModuleClassName(view, 'view');

            return Ext.ClassManager.get(view);
        }
    });