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In a RIA application you are supposed to put as much business logic as possible outside of the RIA layers (flash/silverlight etc). What is the reason behind this? Any logic that goes into the presentation tier gets the benefit of executing faster…
Is this because the RIA technology will most likely need a face lift down the road and you will have to rewrite all the business logic?
I’m not sure I agree with your premise, that you’re “supposed” to put business logic outside the client. You are supposed to move the business logic outside the UI layer, but there are typically still a couple client-side layers left before you hit the back-end web service. A typical Silverlight application, for instance, is based on the MVVM model, which prescribes a View that has no business logic, a ViewModel which has a pretty good chunk of validation and business logic, and a model, which has the rest. And all of that is on the client side.
On the other hand, you really need a business logic layer on the server as well. You can’t rely on a client-side application to filter out all the bad data: someone might be running an old version of the client, or a different client entirely, or might be trying to hack your system.
In other words, ideally, you should have your business logic and validations executing on both the client and on the server: on the client, because you need responsiveness, and on the server, because you need security. The question is how to get this, and there aren’t any perfect answers.
One approach commonly taken in Silverlight applications (I’m less familiar with Flash) is to use WCF RIA services, which allows you to create validations in one place that are executed on both the client and server. Even if you’re not using the WCF RIA Services framework, you can still get much of the same effect by linking to the source code of your validation/business logic classes on both the client and on the web service — it’s more work, but still probably less work than writing your validations twice and keeping them in sync manually.