Conditional versioning

[maciejb]

Is it possible to create something like a Filter that would based on a simple boolean result of some method decide whether the version will be persisted or not?

For example:

@Entity
@Audited
public class Foo {
 
  private String bar;
 
  // getters, setters and the rest
}
 
 

public class FooAuditFilter implements AuditFilter<Foo> {
  public bolean isThisVersionStored(Foo obj) {
    return obj.getBar().equals("baz")  ? false : true;
  }
}
 

+ some magic to attach the filter.

I just quickly looked into the documentation. Sorry if I missed something and the answer is already there.

Cheers,

Maciej

[hernanbolido]

Hi!

Did you think about doing this in a custom AuditEventListener?

Here are some links about this:

http://opensource.atlassian.com/projects/hibernate/browse/HHH-3559

http://community.jboss.org/wiki/EnversFAQ

Hope it helps. Hernán.

[adamw]

Sure it's possible, just subclass AuditEventListener and overwrite some functions. More info in the FAQ: https://community.jboss.org/wiki/EnversFAQ

In the subclass there's nothing preventing you from e.g. reading a custom annotation on the class and executing the appropriate check method.

Adam

[maciejb]

Hernan, Adam -- many thanks.

Yes, that's the approach I was thinking of as well.

I wonder if it would be worth it making the AuditEventListener pluggable, but for now conditional versioning is the only use case I can see. Not worth it I guess.

[adamw]

But the event listener is pluggable

Just specify your class, which overrides AEL in the hibernate configuration.

Adam