CAIRNGORM FRAMEWORK TUTORIAL PDF
Visitor – You prefer to use another framework, but maybe Cairngorm 3 has For example, the Command pattern is still recommended for encapsulating the. Cairngorm is based on Model View Controller (MVC) framework, specifically designed to facilitate complex state and data synchronization. The Current State of Flex Frameworks In this tutorial you will learn a few “best- practices” for Cairngorm projects as well as an extension to the.
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Now imagine a midsize web application that consists of 10 modules. For example, you have to create additional event and command classes for every event that can be dispatched in your application. This site is no tutoiral being maintained and commenting is disabled. All articles with dead external links Articles with dead external links from December Articles with permanently dead external links Pages using Infobox software with unknown parameters. It requires developers to write lots of additional classes, which adds to project timeline.
Please note that the code for the six participants mentioned earlier is organized in separate packages folders. It allows separate responsibilities of developers. Suppose you have 10 [Bindable] String variables in the ModelLocator. Alistair McLeod announced the release of Cairngorm 2.
Read about it here and download it here. So, is Cairngorm right for your project?
Agile Enterprise Application Development with Flex by Tony Hillerson
The Controller is the most sophisticated part of the Cairngorm architecture. In Part 1I discussed the basic implementation and use of the ModelLocator czirngorm.
Ccairngorm 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. To learn the expanded Cairngorm Flow, you will need to learn frajework few new Cairngorm elements. The IResponder interface, which is also implemented by the Command class, includes onResult and onFault methods to handle responses returned from the invoked remote service.
It also implements the interface IResponderwhich requires you to add the result and fault methods. Many people have asked that I make the Cairngorm Series downloadable the video portions. However, before you can properly implement this design pattern you need to learn about the organization of a Cairngorm project. Until they do — you can use the following:. 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 cairngorrm that is not used in our scenario.
The role of the View layer in a Cairngorm application is to throw events and bind to data stored in the Model. It was developed by caringorm You will caairngorm an FLV player to view them. Up to now the tutorials have covered only one design pattern, the ModelLocator, but now you will be introduced to the most crucial element of Cairngorm, the Service to Worker design pattern.
Using Cairngorm with Adobe Flex – Part1 |
When a View component fires an event, FrontController finds the Command class that was registered with this event and calls its method execute. It offers a number of classes implementing Model, View, and Controller tiers, and interaction between them.
By using these callbacks the delegate will return to the command class the result or error information of the execution of the command in question. Many of them have learned from my tutorials.
This pattern is one of many design patterns contained within the Cairngorm micro-architechture. Just simply renaming this variable in the ModelLocator will require changes in one or more views that are bound to it. Object; public function LoadEmployeesDelegate command: Many people were interested in Cairngorm, but I only had about 10 minutes to explain the basics of Cairngorm. This leads to the need for additional coding to convert the data to appropriate types.
Cairngorm separates business- and UI-related work into different layers, which means that the work of the project team can be split between developers cirngorm for the visual portion and those who are coding just the business logic of the application. From Wikipedia, the free encyclopedia. A static reference to the ModelLocator singleton instance is used by the View uttorial to locate the required data.
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. The execute method can update the central Model, as well as invoke a Service class framwork typically involves communication with a fra,ework server.
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 basic Cairngorm Event Flow that is handled in Part tuutorial is essential to any Cairngorm application, but most applications interact with a server. Please note that as ActionScript 3 does not support private constructors, the public constructor of this class throws an error if someone tries to improperly instantiate it i. I am certainly open to corrections if you see that I have made an error on this project.
The Command class updates the data in the model typically, a collection of value objects defined in the global ModelLocator. Retrieved from ” https: The other benefit is reusability of the modules. For some reason, the author of this code decided not to use EmployeeVO here and stores each Employee attribute separately in SaveEmployeeEvent. The fact that Cairngorm is built around a Command cairngor with a centrally located command repository can be very convenient for some projects that require audit or undo functionality.
The Command class updates the model. Having no other choice but data binding for updating the UI may cause performance problems. Regardless of what framework you are going to use, separating various application components in project subfolders helps make the project more organized. If one of them tutoiral get updated, not only will its listener get notified to update the view, but the other 9 will get this event, too. It was open sourced in the summer of Adobe Flash Media Server.
The problem with this approach is in the global nature of such an event handler. In the example code, CairngormEventDispatcher dispatches the cgEvent: