Inspecting whether an entity has changed its state

juanignaciosl · **Joined:** Mon Apr 02, 2007 8:08 am **Posts:** 24

I know Hibernate detects whether an entity has changed its state or not. How does he do it? Cglib? How can I detect it?

carlolf · **Posted:** Thu Jan 10, 2008 12:25 pm

You can get informed by Hibernate if you write an Interceptor. For example see this:

Code:

public class HistoryInterceptor extends EmptyInterceptor {

(...)
public boolean onFlushDirty(final Object pEntity,
                              final Serializable pId,
                              final Object[] pCurrentState,
                              final Object[] pPreviousState,
                              final String[] pPropertyNames,
                              final Type[] pTypes) throws CallbackException {
// do something
}

There are other methods you might override, if needed. Have a look into the docs and Hibernate's source.
And: be aware that you are restricted in what you can (not) do in the interceptor!

Carlo

juanignaciosl · **Joined:** Mon Apr 02, 2007 8:08 am **Posts:** 24

Thanks for your response. We followed your suggestion of looking inside the code (attatching source code to binary jars for debugging is priceless!). Finally we managed to do it with _post_ events. Post events are triggered only after effective database comunication.