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From "Jukka Zitting" <jukka.zitt...@gmail.com>
Subject Re: Web app design pattern questions
Date Wed, 20 Jun 2007 08:16:38 GMT

On 6/19/07, bilobag <bilobag@hotmail.com> wrote:
> I am in the beginning stages of a web based CMS tool using JSF, Spring and
> Jackrabbit.  Please give any design advice you may have for the following
> questions:

Chiming in a bit late...

> 1) I have 3 node types. Content, book, magazine.  Book and magazine extend
> the content type.  They all have some common properties and some different
> properties.  Now I first thought about creating wrapper classes that just
> wrap the Node object and provide getters/setters for any properties I have
> for each nodeType.  However, I am unsure if this is a good idea possibly
> because of locking and concurrency issues.  I don't know if its a better
> idea to have data transfer objects instead to move data to/from the front
> end.  However, its more work to have to copy the propertys to/from the DTO
> objects back into the node, but it could be the safer design.

When possible I typically try to avoid extra layers on top of JCR.
Unlike relational databases, JCR is actually quite "OO-friendly" so
the need for an DAO/DTO layer is not that big. Typically such a layer
just ends up limiting the available functionality.

I'm not against the OCM tool as is, I think it is very useful when you
already have an existing object model to be persisted, but if you get
to start from scratch then I would rather recommend directly using

My favourite way of working with JCR is to treat nodes as stateful
resources, and my code as a set of stateless operations to be applied
on those resources. Such an approach is very "web-friendly".


Jukka Zitting

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