You are right about the problem though. While callbacks invocations
are polymorphic (i.e. a concrete subclass' implementation will be
invoked in runtime), callbacks "compilation" requires a method to be
defined on a class that declares a callback. I guess this is (a) a bug
and (b) a victim of us closely following the JPA spec that does not
have a concept of a generation gap pattern.
Andrus
On Mar 30, 2010, at 9:57 PM, Andrus Adamchik wrote:
Not sure about the callback part, but using enum as a discriminator
is not yet supported:
http://issues.apache.org/jira/browse/CAY-1213
Andrus
On Mar 30, 2010, at 6:52 PM, Michael Gentry wrote:
OK, this is kind of a followup on the generated abstract class...
I'm attempting to test using inheritance with an enum as the
discriminator column and a callback. For my classes:
Product (Abstract) with Book and Game inheriting from Product.
Product contains an enum (ProductType) to discriminate between the
two.
Product's post-add callback I set to "initializeProductType" and
Cayenne generated this in _Product.java:
protected abstract void initializeProductType();
I had to go into Product.java and change that class to be abstract (I
don't want any instances of it created). I implemented
initializeProductType() in Book.java and Game.java (my only
subclasses
thus far). At runtime, I get this exception:
Exception in thread "main" java.lang.IllegalArgumentException: Class
mrg.model.Product has no valid callback method
'initializeProductType'
Of course, this exception message is entirely true: Product does not
contain initializeProductType() because it is in the subclasses.
Thoughts on if this is legitimate?
Thanks,
mrg
PS. The callback method implementation is: @Override protected void
initializeProductType() { setProductType(ProductType.BOOK); } (for
Book, of course).
