On Jun 25, 2008, at 1:00 AM, Artem Melentyev wrote:

> Hi, Vincent.
> Sorry for late reply.
>
> Vincent Massol wrote:
>> It seems like you're transforming current storage code into
>> components. I'm not sure what important advantages this brings. What
>> I'd like to see is to have new code and new apis use components but
>> I'm not sure about old code. Maybe you could explain what's your  
>> plan?
>
> The plan is in proposal "Componentize XWiki Stores"
> http://xwiki.markmail.org/message/vs7wbfjv7ipyz2t3 and XWIKI-2443
> I don't see anything wrong in components in old code.

No you're right there's nothing wrong with that. I initially thought  
it was just an effort that wouldn't be worth it since it would need to  
be done again when we move to the new interfaces. However I see you're  
using that to solve an issue with sharing some Hibernate factories so  
that's fine to me.

>> Do you plan to create clean interfaces for storage?
>
> not yet.
> I just want to refactor old storage system for easy support of many
> storage implementation. Current store system contains too many code
> duplication (business code, manipulate with model) for different  
> storage
> implementations. And I want to separate simple DAO components (which  
> can
> be used as prototype for new storage components) from old stores to
> resolve it.

ok so this is an intermediary step between what we have and the  
"clean" components I guess.

>> If so this really
>> needs to be discussed and proposed on the devs list with a design  
>> page
>> on xwiki.org.
>>
>> However this probably requires a prerequisite of having the new model
>> in place before it can be started? wdyt?
>
> Yes for new storage component.
>
> So the question I have is: should I completely rewrite storage  
> system (+
> new model) from scratch just for add a good jcr storage :) or can I  
> just
> refactor old one?

This is a good and valid question. I think you're doing right and  
since this  JCR implementation is needed sooner rather than later and  
since we're missing the prerequisites (new model) I think it's best to  
overhaul the current JCR implementation using the old API but  
providing an easy migration path for later on (which is what you're  
doing I think).

> New storage is better of course. But it requires so much work,
> especially on new model.
> When new data model is planed?

I think we should restart the discussion this summer so that we all  
agree on the model. Then the implementation shouldn't be too hard  
since I think we can have the 2 models cohabit. I need to finish the  
new rendering foundations (then I'll need other committers help to  
rewrite the macros - I wish we could find a macro framework in Java  
with lots of existing macros but I doubt it).

Thanks Artem
-Vincent

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