[Registry-dev] Transactional API methods for the Regisrty interface

[Chathura C. Ekanayake]

When performing resource imports to the registry, it is necessary make 
the whole import transactional.
For example we don't want to end up importing only few files and 
subdirectories in a imported directory,
if the import fails in the middle of the operation.

To overcome this, I propose following two methods for the Registry 
interface.

public void beginTransaction();

public void commit();

So the ResourceImporter can call the beginTrasaction() method before 
starting the import. Then import
all resources by calling the put(...) method for all files. Finally call 
the commit() method.

Then JDBCRegistry impl can perform all the put() and other updating 
methods in a single database transaction.

Alternative approach would be to introduce a import(...) method to the 
Registry interface, so that it internally
invokes all put(...) methods in a single transaction.

Thoughts...

Thanks,
Chathura