Question

is there any possibility to call method just before making object persistent?
Something like “onMakeObjectPersistent()”

I want to calculate geohash basing on lon and lat and store it in datastore.

Regars,
M

Solution:

as @Duy Do post:
in JDO we can do that using jdoPreStore() method:

@PersistenceCapable
public class Foo implements StoreCallback{
    public void jdoPreStore()
        //do something
    }
}

Answer 1

I have not use GAE but I think if you use JPA you can use PrePesist annotation along with method you want to call before the object is persisted. With JDO you can use method jdoPreStore().