I'm trying to both wrap my head around Cornerstone and fill a need by creating an Open Source voting application and a portlet to go with it. I've set up my database and a simple test app based on DemoPersistence.java. The db has no users and I tried to createInstance(new Integer(101)), thinking it would create a new record in the db. Apparently retrieveAndPopulate, which createInstance calls, just returns null if the query returns and empty recordset. After doing walkabout in the code I discovered the following inheritance tree:
BasePersistentObjectFactory
which extends BasePersistenceFactory (implements IPersistenceFactory),
which extends InversionOfControlFactory,
which extends BaseFactory
Seeing that store(Object) in BasePersistentObjectFactory first calls createInstance(), I tracked createInstance() to the IoC factory.
To make a long story short, and sum up the behavior:
a. createInstance(param) - retreives the instance data from the database
b. createInstance() - creates a fresh new instance
c. inst = createInstance(), set properties, store(inst) create a fresh new instance and stores it in the db
This may be old hat for many folks, but for anyone trying to get a handle on creating their own persistent object this may be useful.
Bill Barnhill
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