By Shashank Tiwari, Elad Elrom
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Create a command to call the service and invoke the command on a user or system event. Create a mechanism for the model and the view to send notifications to each other. , with minimal rigid dependencies) event bus to propagate and consume events as they get generated during the application interaction life cycle. This would be an extension of the existing event system in Flex. Create a model registry and have a mechanism to store and retrieve models using the registry. Allow for generation of entire applications on the basis of model definition, especially for CRUD applications.
This brings forth the challenge of mapping objects to their relational counterparts. This is popularly called Object Relational Mapping (ORM). It becomes necessary if your services that fetch external data bring in result sets in relational form. A Flex application could get data in one of the following ways: Fetch data from a remote server, which can serialize objects through to the Flash Player. Fetch data from some remote source in terms of record sets (this could be returned via an HTTPService, WebService, or some other form of remote service).
All the ideas support loose coupling and event-driven architecture. I also suggest you actively shun a few ideas, which are listed here as antipatterns: Rampant use of data binding for model change propagation is discouraged. Binding is based on the event model, but excessive usage of binding essentially leads to creation and propagation of many events that are never handled or utilized. Often you are only trying to capture the changed property value of a specific model element at certain points of interaction.