RE: [OJB-developers] Kill the mapping files

[<ll...@li...>]

I maybe the XML PersistenceBrooker isn't too hard to write. Perhaps it
would be possible to hook-up the "Long-term-bean-persistence" framework
in jdk 1.4 with the OJB metadata interface. If not, maybe some other
existing XML persistence framework might fit in.

I would really like to give it a shot. I am currently under some
pressure on a project deadline, so I cannot promise you anything in a
near future. But I will look into it. At least with some research work.

/Lasse

-----Original Message-----
From: obj...@li...
[mailto:obj...@li...] On Behalf
Of Thomas Mahler
Sent: 28. februar 2002 16:37
To: Lasse Lindg=E5rd
Cc: 'ojb'
Subject: Re: [OJB-developers] Kill the mapping files


Hi again,

Lasse Lindg=E5rd wrote:

> Thomas,
>=20
> I think your "cost-benefit" argument is a very valid one.
>=20
> The idea I have might be a good one on a longer term. But the
> up-front-cost for refactoring might turn out to be too heavy.

 >

> Still refactoring the mapping files out would eliminate the task of
> changing the mapping-file format.


This is a good argument.
Lasse, why not give it a try and provide a little prototype showing how=20
to persist the MetaData.
For the time being we can keep things simple and ignore the bootstrap=20
issues. Simply write and read a complete DescriptorRepository to/from=20
the database.
A DescriptorRepository should have a uinque Name like=20
"repository-Myapp-1.2-production"


>=20
> Maybe the right approach is to hope and wait for a XML
> PersistenceBrooker to come along and the refactor the metadata to use
> that.


That would make things much easier, indeed! (Any volunteers ? ;-) )


>=20
> How about using the mapping api directly instead of using XML files.
Is
> that possible as OJB is constructed now ?
>=20


Yes, definitely. That's what I'm always talking about. You can assemble=20
the DescriptorRepository programmatically. There is even a Method in the

PersistenceBroker interface to add new (or change existing)=20
ClassDescriptors to the repository.

The ojb.broker.metadata.RepositoryXmlHandler (A sax document handler)=20
shows how to use the metadata API to assemble a repository.

cu,

Thomas





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