AW: [Objectbridge-jdo-dev] creating and configuring PersistenceBr oker

[Mahler T. <tho...@it...>]

Hi Travis,

> 
> 
> What would be the best way to configure the 
> persistencebrokers without having them read from the repository file?
> 

Brokers actually don't rely on a repository.xml file but on a
ojb.broker.metadata.DescriptorRepository!

So the real question is: "How to build up a Descriptor repository from a
.jdo file?"

1. step: in OJ.properties set
repositoryFile=repository.jdo

2. step: change the method
ojb.broker.metadata.RepositoryPersistor.readFromFile as follows
    public DescriptorRepository readFromFile(String filename)
        throws MalformedURLException, ParserConfigurationException,
SAXException, IOException
    {
		if (filename.endsWith(".xml"))
		{
  	     	return buildRepository(filename);
		}
   		else if (filename.endsWith(".jdo"))
   		{
   			return buildRepositoryFromJdo(filename);
   		}
   		else
   		{
   			throw new PersistenceBrokerException("can't parse "
+ filename);
   		}
    }

3. step: implement the new method 
private DescriptorRepository buildRepositoryFromJdo(String
repositoryFileName)

in this method you will parse the jdo file and generate a
DecsriptorRepository from it.
As far as I can see there is no need to have a extra classes like
ojb.jdo.metadata.MetaClass as all this is already there in
ojb.broker.metadata.ClassDescriptor.

4. change your JDOManagerFactory to use
PersistenceBrokerFactory.createrBroker("repositoty.jdo") instead of
"repository.xml".

HTH,

Thomas

> Example: for jdo impl, the metadata gets read in, then when 
> calling PersistenceManagerFactory.getPersistenceManager() the 
> broker associated with the Manager should be filled 
> configured with the jdo metadata.
> 
> Travis 
> 
> 
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