Sunday, September 27, 2009


DCI's extremely flexible runtime structure opens up several possibilities for RESTful routing. Since DCI uses a role-based runtime structure, we can use URLs to query the application as a dynamic source of data instead of a series of static links that provide access to the underlying system. This method allows for nearly transparent controllers, as explained below:

MVC REST Routing -- Standard Convention

Most MVC based frameworks, including Rails and Symfony, use a controller-centered routing model. For example, the default routes in rails translate to:

This routing method works for most web based applications but with DCI, there is no static routing to a controller, but rather a 'request for a dynamic context execution'.

DCI REST Routing -- Proposed Method

With DCI routing, there is a special consideration to take into account when designing a system. Since the runtime network is dynamically created, the same base actions can take place from completely different places with different actions.

For example, if we were creating a message board application, we could create a post from either a logged in context or an anonymous (application) context. The access URL would be different, but the same base action would be taking place with different 'arguments':{context}/{data model}/{action}/{args}

In this situation, there are 2 distinctly different contexts executing the same action (create) on the same model (post). The app context is the public application context that is used to anonymously perform system actions. These actions could be reading an about page, submitting a form on the contact page, or they could be posting anonymously on a message board. The user/username context is used to perform system actions as a specific individual. This allows for models and views to be created, then simply deciding which contexts can perform which actions. In this way, we can mostly replace the job of the controller (providing model data to the views) with simple REST routing.

The source code is currently being reworked to reflect these capabilities.

No comments:

Post a Comment