This document is from the authorized Flex curriculum written by learn the basics of building Flex applications using the Cairngorm framework. Cairngorm is based on Model View Controller (MVC) framework, specifically designed to facilitate complex state and data synchronization. These explain the Cairngorm Architecture, which is our preferred way to structure Flex applications. Below the introductory material can be found more detailed.
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Leave a Reply Cancel reply Enter your comment here Applied Mechanics and Materials Volumes ServiceLocator can be used not only as a repository of all services, but also as an authorization mechanism that restricts access to certain application services based on specified credentials. The class LoadEmployeesEvent package com.
The problem with this approach is in the global nature of such an event handler.
The View portion contains visual components required by your application, value objects, and Cairngorm-specific event classes used for communication with the Model and Controller tiers. Both of which has awesome documentation and a very active community.
For example, employee startDate cxirngorm be stored as a string and will require code to convert it to Date if any date manipulations glex be needed. For web services, call the method getWebService. The event object may include additional data if required by the developer.
Please note that the code for the six participants mentioned earlier is organized in separate packages folders. Object; public function LoginDelegate responder: Email required Address never made public.
List of Flex frameworks
View Because each model located inside the ModelLocator is bound to a UI control, its content gets updated automatically. Because this application does not save modified data anywhere other than in memory, no other ser vice calls are cairngork to pass the changed data to the server side for persistence.
In recent years, the Flex technology has been widely used. The command folder is for Command classes; control is for events and FrontController ; the Frameqork is located in the model folder; and the view folder has visual components as shown in Figures through To find out more, including how to control cookies, see here: Although keeping all application events in one place simplifies their maintenance, it leads to tighter coupling of frameworkk application components.
The result will be responded in the result method of The command, the model will be updated and binded to the result view: The Controller tier cairnvorm responsible for invoking appropriate code containing the business logic of your application, which is implemented by using global FrontController and ServiceLocator classes as well as additional Command and Delegate classes. The delegate is created within a command object. ModelLocator The Command class updates the data in the model typically, a collection of value objects defined in the global ModelLocator.
The execute method can update the central Model, as well as invoke a Service class which typically involves communication with a remote server.
flex – How cairngorm framework works internally – Stack Overflow
Sign up or log in Sign up using Google. Service Locator defines the interface to communicate with datasource Httpservice, Webservice,Remoteobject. Cairngorm separates business- and UI-related work into different layers, which means that the work of the project team can be split between developers responsible for the visual portion fled those who are coding just the business logic of the application. Please note the use of four global objects: Explore the Flex Cairngorm framework and improvements: The other view work flow is similar to the above… The FB Project structure like: Please look around if you live in a cage J.
Implemented as a singleton, it contains references to all services an application will use. The Cairngorm framework improved more suitable for small and medium-sized Web applications development and maintenance. The Controller is the most sophisticated part of the Cairngorm architecture. I had gone through many documents, no where mentioned how cairngorm framework works internally, means, how cairngorm Event, frontController, BusinessDelegate,ServiceLocator,Commands frmaework and why we are extending or implementing cairngorm class like ICommand, IResponder and cairngormEvent.
When a View component fires an event, FrontController finds the Command class that was registered with this event and calls its method execute.
It defines remoteobject in this example. If you have to develop a project without experienced Flex developers on your team, however, Cairngorm can give your project a structure that will prevent it from failing. Cairngorm Framework for Flex Developers p.
The method execute must have an argument—the instance of the CairngormEvent object that may or may not encapsulate some application data for example, some value object that is not used in our scenario. Email required Address never made dairngorm. Using a centralized ModelLocator also makes multiple components dependent on the knowledge of the properties glex the model.
In the example code, CairngormEventDispatcher dispatches the cgEvent: It was open sourced in the summer of For example, you have to create additional event and command classes for every event that can be dispatched in your application. Even in a midsize application this can translate to a hundred or more additional Cairngorm-specific classes.
The magic is in Main application view: Flex frameworks are software libraries that assist developers in building rich internet applications on the Apache Flex platform.
The complete frontend-logic of the RIA is encapsulated within the commands. This paper researches the methods of design and developing the information system, which is based on E-learning2.