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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Online, you may encounter lots of debate regarding whether Cairngorm should be used in Flex projects. If one of them will get updated, not only will its listener get notified to update the view, but the other 9 will get this event, too.
Please note that the code for the six participants mentioned earlier is caiengorm in separate packages folders. Create a common ancestor to all your commands and define the fault method there to avoid repeating the same code in each command class.
Apache Flex – A Practical Guide: Introduction to MVC Architecture of Cairngorm
The revcieved event is a generic CairngormEvent and must be casted to the appropriate custom event first. Fill in your details below or click an icon to log in: It should only pass strongly typed value objects to a responder.
The Controller tier is 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.
How to glue this junk together? The Cairngorm framework improved more suitable for small and medium-sized Web applications development and maintenance. In Cairngorm everything should be mapped to an event. Just move the business logic from the delegate right into the execute method of the command class itself. This class creates an event with an ID AppController. Using a centralized ModelLocator also makes multiple components dependent on the knowledge of the properties of the model.
Is there any way simplify it? The problem with this approach is in the global nature of such an event handler. Adobe Flex Master Lu. Use either RobotLegs or Parsley. Although keeping all application events in one place simplifies their maintenance, it leads to tighter coupling of the application components. The Command implementation package com. AppModelLocator; [Bindable] private var model: The command folder is for Command classes; control is for events and FrontController ; the ModelLocator is located in the model folder; and the view folder has visual components as shown in Figures through This is my architecture diagram: Cairngorm is based on the MVC model.
Flex – Cairngorm Architecture Overview
Cairngorm has been around longer than any other Flex framework. It is part of the Adobe Engagement Platform. Please note the use of four global objects: Publishing House of Electronics Industry, The result will be responded in the result method of The command, the model will be updated and binded to the result view: Email Required, but never shown. So, is Cairngorm right for your project?
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The author, after a careful study of the entire framework, has made some improvements on the Cairngorm framework of service call mechanism, which proposed the Cairngorm framework of improved. The delegate is created within a command object. Adobe Flex application framework designed to start introduction of the Cairngorm framework.
Even though data binding can help in writing less code, because Cairngorm enforces data binding as the only mechanism of updating the views, it makes them nonreusable. When a View component fires an event, FrontController finds the Command class that was registered with this event and calls its method execute. Development managers who have to work with distributed teams of beginner or mid-level Flex developers and need a safety net to split the project work into smaller controllable tasks e.
Sign up using Email cairntorm Password. The class LoadEmployeesEvent package com. It requires developers to write lots of additional classes, which adds to project timeline.
Cairngorm follows the principle of separating the view and business logic which is known as the Model-View-Controller pattern MVC. You are commenting using your Twitter account. The Front Controller object serves as a central registry of all Cairngorm events. Start Free Trial No credit card required.
Flex – Cairngorm Architecture Overview | Kumar’s Blog
Cut It Off-Cairngorm without front controller. The other view work flow is similar to the above… The FB Project structure like: On the application startup, the code dispatches LoadEmployeesEvent and, as if by magic, the EmployeeList gets populated from Employees.
All data managed in the model should only be updated through a command or a responder object. But it is complicate and hard to study and maintain.
Agile Enterprise Application Development with Flex by Tony Hillerson
This model locator stores the data and the state of this application—in particular, the variable employeeListDPwhich is the place where the list of employees is being stored.
The first step of using Cairngorm should be creating the backbone of frame work. It aims at greatly simplifying the development of RIA applications through client-side data management, real-time messaging, transparent lazy-loading, paged queries, code generation and other features. The Model tier is represented by the class ModelLocatorwhich stores the application-specific data these are often collections of value objectsa.
To eliminate the need to import CairngormEventDispatcher in every view, starting from Cairngorm 2. Flez page was last edited on 25 Decemberat