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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In the example code, CairngormEventDispatcher dispatches the cgEvent: The command has to do the business: To load the employees, the Command class creates cairrngorm 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:. By continuing to use this website, you agree to their use.
To minimize the amount of manually written code, consider using Cairngen, an open source code generator for Cairngorm. Views Read Edit View history. Model Locator carries all the transport information between the components It is a Bindable object. It’s extensions for Parsley. Enter your email address to subscribe to this blog and receive notifications of new posts by email.
Fina1 draft 2nd edition of ECMA Command When a View component fires an event, FrontController finds the Command class that was registered with this event and calls its method execute. Even in a midsize application this can translate to a hundred or more additional Cairngorm-specific classes. FrontController allows you to map only one command per event, yet your application may need to have several event listeners per command.
Because each model located inside the ModelLocator is bound to a UI control, its content gets updated automatically. Adobe launched the Cairngorm application development framework. A static reference to the ModelLocator singleton instance is used by the View layers to locate the required data. The SaveEmployeeEditsEvent event is dispatched: The following list shows the different elements that form the framework. Software architecture Free computer libraries. Please note that the code for the six participants mentioned earlier is organized in separate packages folders.
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. For web services, call the method getWebService.
Cairngorm 3 isn’t based on Parsley. For example, you have to create additional event and command classes for every event that can be dispatched in your application. Read Chapters 2and 6and then decide whether you prefer working with the components described there or one of the architectural MVC frameworks.
It analyzes general system architecture and application developing frameworks and puts them into practice. The loadEmployeesService class reads Employees.
Flex – Cairngorm Architecture Overview
Then high reusability and ease of use supporting system have been developed. The delegate is created within a command object. By doing so, Flex automatically converts an server-side object returned through remoting or data service interaction to its corresponding ActionScript object.
Online, you may encounter lots of debate regarding whether Cairngorm should be used in Flex projects. Flex frameworks are software libraries that assist developers in building rich internet applications on the Apache Flex platform. You are commenting using your Twitter account. Even though data binding can help in writing less code, because Cairngorm enforces data binding as the only dramework of updating the views, it makes them nonreusable.
Each command must implement the Cairngorm ICommand interface and its execute function. The delegate is used to call the data source through the service locator: There are tons of articles and diagram to discuss about.
We prefer working with frameworks that offer enhanced Flex components rather than just separation of work among team members. With a remoting technology like Fairngorm it is even possible to pass back value objects witch are transformed to their corresponding ActionScript objects in the application, so it can interact with them as if they are created by script.
Agile Enterprise Application Development with Flex by Tony Hillerson
It is specifically designed to facilitate complex state and frameowrk synchronization between the client and the server, while keeping the programming of the View layer detached from the data implementation. Now imagine a midsize web application that consists of 10 modules. Just simply renaming this variable in the ModelLocator will require changes in one or more views that are bound to it.
Implemented as framewoork singleton, it contains references to all services an application will use. The Cairngorm framework is the mainstream framework for Flex application development, the framework is based on the MVC design pattern, it simplifies the application development model.
Framwwork on the Structure Design of Operating Systems p. Having no other choice but data binding for updating the UI may cause performance problems. Both of which has awesome documentation and a very active community. It Accepts the service requests from the RIA and responds back data.
Apache Flex – A Practical Guide: Introduction to MVC Architecture of Cairngorm
Please look around if you live in a cage J. To find out more, including how to control cookies, see here: Adobe Labs features Cairngorm as the architectural framework for Rich Internet Application programmers.
They recieve the event and its data, execute the logic an can change the workflow state of the model and view. The execute method can update the central Model, as well as invoke a Service class which typically frzmework communication with a framewoork server.
The event object may include additional data if required by the developer. The role of the View layer in a Cairngorm application is to throw events and bind to data stored in the Model.