Re: Repository descriptors, PBKey and OJB 0.9.9

[Ilkka Priha]

Thanks Armin,

This works great! Now we can change our configuration during run-time in a feasible manner without restrictions :-)

-- Ilkka


Armin Waibel wrote:

Hi Ilkka,

I checked in new version of the MetadataManager
with some new service methods among other things
your proposed read methods.

HTH
regards,
Armin

----- Original Message -----
From: "Ilkka Priha" <[EMAIL PROTECTED]>
To: "OJB Users List" <[EMAIL PROTECTED]>
Sent: Tuesday, February 11, 2003 2:42 PM
Subject: Re: Repository descriptors, PBKey and OJB 0.9.9

Hi Armin,

-- cut --

Currently there are only methods to add
ClassDescriptors, .... add runtime.
I think to realize that functionality we need merge methods for
DescriptorRepository and ConnectionRepository:

MetadataManager.mergeDescriptorRepository(DescriptorRepository
newRepository)

Is this what you have intended?

regards,
Armin

In principle, yes, but starting from the descriptor file. So should
something like this work and will it be supported in future releases:

RepositoryPersistor rp = new RepositoryPersistor();
ConnectionRepository cr = rp.readConnectionRepository("mysql.xml");
DescriptorRepository dr = rp.readDescriptorRepository("mysql.xml");

List list = cr.getAllDescriptor();
ConnectionRepository metacr =
    MetadataManager.getInstance().connectionRepository();
for (Iterator i = list.iterator(); i.hasNext();)
{
    metacr.addDescriptor((JdbcConnectionDescriptor) i.next());
}

Map.Entry entry;
Map map = dr.getDescriptorTable();
DescriptorRepository metadr =
    MetadataManager.getInstance().getRepository();
for (Iterator i = map.entrySet().iterator(); i.hasNext();)
{
    entry = (Map.Entry) i.next();
    metadr.put(
        (String) entry.getKey(),
        (ClassDescriptor) entry.getValue());
}

It just doesn't seem to be flexible enough for us to define all
descriptors in a property file during startup of a web service system
supporting dynamically configurable applications, which are loaded and
unloaded without shutdown. I think that OJB has all the capability
needed for dynamic configuration, it's just difficult to figure out
correct classes and methods to apply to use this potential.

Of course the merge methods would make things easier, but even the

above

code would be fine if we just dare to use it in our application :-)

Thanks,
  Ilkka




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