For the love of GOD, don’t use Cairngorm (2) as a framework. Use either RobotLegs or Parsley. Both of which has awesome documentation. These explain the Cairngorm Architecture, which is our preferred way to structure Flex applications. Below the introductory material can be found more detailed. In recent years, the Flex technology has been widely used. Adobe Flex application framework designed to start introduction of the Cairngorm framework.
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The Front Controller object serves as a central registry of all Cairngorm events. The Delegate implementation package com. It is specifically designed to facilitate complex state and data synchronization between the client and the server, while keeping the programming of the View layer detached from the data implementation.
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 flx is not used in our scenario. This model locator stores the data and the state of cairngofm application—in particular, the variable employeeListDPwhich is the place where the list of employees is being stored.
The execute method of SaveEmployeeEditsCommand does not use any delegates, as it just needs to add a newly inserted Employee to the im.
With Safari, you learn the way you learn best. Cairngorm was designed to ensure that UI components do not need to know where data is located. Cairngorm 3 is based on Parsley. Whenever the user interacts with the view or an action occurs an event must be dispatched. In the example code, CairngormEventDispatcher dispatches the cgEvent: By doing so, Flex automatically converts an server-side object returned through remoting or data service interaction to its corresponding ActionScript object.
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. Meanwhile, keep these observations about Cairngorm in mind:.
The free, open source framework was originally implemented in the ActionScript 3 language for use with Adobe FlexFlash and AIRand it has since been ported to nearly all the major web development platforms.
It extends the Cairngorm FrontController class and maps the dispatched events to its corresponding commands.
Apache Flex – A Practical Guide: Introduction to MVC Architecture of Cairngorm
The other benefit is reusability of the modules. Each command must implement the Cairngorm ICommand interface and its execute function.
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cwirngorm Get unlimited access to videos, live online training, learning paths, books, tutorials, and more. Explore the Flex Cairngorm framework and improvements: Please note that as ActionScript 3 does not support felx constructors, the public constructor of this class throws an error if someone tries to improperly instantiate it i. 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.
Flex – Cairngorm Architecture Overview | Kumar’s Blog
frameworl It must be implemented as a singleton which implements the Cairngorm IModelLocator. Just simply renaming this variable in the ModelLocator will require changes in one or more views that are bound to it.
A value object is a class that only has properties to store values. To load the employees, the Command class creates an instance of the proper delegate passing the reference to itself this is how the delegate knows where to return the data and calls the method loadEmployeesService:.
The Command class updates the data in the model typically, a collection of value objects defined in the global ModelLocator. FrontController allows you to map only one command per event, yet your application may need to have several event listeners per command. A responder recieves the result of a service call and implements frontend-logic like a command.
A collaboration of recognized design patterns, Cairngorm exemplifies and encourages best-practices for RIA development advocated by Adobe Consulting, encourages best-practice leverage of the underlying Flex framework, while making it easier for medium to large teams of software engineers deliver medium to large scale, mission-critical Rich Internet Applications.
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