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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You are commenting using your Facebook account. All data managed in the model should only be updated through a command or a responder object. We prefer working with frameworks that offer enhanced Flex components rather than just separation of work among team members. 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.
Components on the View can bind to Value Objects or other properties in the Model data layer. The business folder is for delegates and service components. Cairngorm Framework for Flex Developers p.
The next point of interest is the class LoadEmployeesCommand. Command When a View component fires an event, FrontController finds the Command class that was registered with this event and calls its caiirngorm execute.
And Every Event has to be mapped to a Command: Cairngorm follows the principle of separating the view and business logic which is known as the Model-View-Controller pattern MVC.
List of Flex frameworks
It allows separate responsibilities of developers. By continuing to use this website, you agree to their use. The class LoadEmployeesEvent package com. IResponder; private var service: Framewlrk draft 2nd edition of ECMA And make the developer more professional Geek J. Please note that as Rfamework 3 does not support private constructors, the public constructor of this class throws an error if someone tries to improperly instantiate it i.
You are commenting using your Twitter account. The framework design is based on singletons, which leads to tight object coupling.
Cairngorm Framework for Flex Developers
Online, you may encounter lots of debate regarding whether Cairngorm should be used in Flex projects. Just simply renaming this variable in the ModelLocator will require changes in one or more views that are bound to it. The other benefit is reusability of the modules. Use either RobotLegs or Parsley. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.
The Front Controller object serves as a central registry of all Cairngorm events. Now imagine a midsize web application that consists of 10 modules. Sign up using Facebook. Adobe launched the Cairngorm application development framework.
Typically every action of view will need create a event: Have you noticed that the Command class has also reached for the AppModelLocator to be able to update the model? Responders implement the mx. For example, employee startDate will be stored as a string and will require code to convert it to Date if any date cairngoem will be needed. I had gone through many documents, no where mentioned how cairngorm framework works internally, means, how cairngorm Event, frontController, BusinessDelegate,ServiceLocator,Commands works and why we are extending or implementing cairngorm class like ICommand, IResponder and cairngormEvent.
Sorry, your blog cannot share posts by email. A value object is a class that only has properties to store values. Unlike the other elemente in the Cairngorm architecture, it does not extend a class or implement an interface, but it need to follow some guidelines: Rich Internet Application White Paper. If this application has been built using Cairngorm, each of these modules becomes dependent on the central FrontController located in the main.
List of Flex frameworks – Wikipedia
In the example code, CairngormEventDispatcher dispatches the cgEvent: The IResponder interface, which is also implemented by the Command class, includes onResult and onFault methods to handle responses returned from the invoked remote calrngorm. Because this application does not save modified frajework anywhere other than in memory, no other ser vice calls are made to pass the changed data to the server side for persistence.
The execute method can update the central Model, as well as invoke a Service class which typically involves communication with a remote server. 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.
Cairngorm Framework for Flex Developers
Suppose you have 10 [Bindable] String variables in the ModelLocator. For some reason, the author of this code decided not to use EmployeeVO here and stores each Employee attribute separately in SaveEmployeeEvent.
Cairngrm Locator carries all the transport information between the components It is a Bindable object; Service Locator defines the interface to communicate with datasource Httpservice, Webservice,Remoteobject.
Read Chapters 2and 6and then decide whether you prefer working with the components described there or one of the architectural MVC frameworks. Publishing House of Electronics Industry, This is my architecture diagram: