Is there a way to pass information to hibernate layer in a generic way, like adding object to current session/transaction.

I have a hibernate interceptor which logs some information to db, I would like to pass user name/ transaction id information from application layer to hibernate layer without adding this information to exiting persisting objects.

Thanks!

I'm not sure I understand your question; maybe if you wrote some pseudo-code it would be a little clearer.

But the Session interface has a lot of methods that might serve your needs, like get, find, merge, etc.

-larry

Here is what I am trying to do.

Lets say application code does following

/*** application code begins ***/
session.beginTransaction();
myDAO.saveSomething(myPesistentObj);
yourDAO.saveSomethingElse(yourPesistentObj);

// I would like to have some object in run time, where I can store information
// like USER NAME, TRANSACTION ID, SOME OTHER INFO
/ This information later should be accessible by hibernate interceptor
session.endTransaction();

/*** application code ends **/



I have written a interceptor modeled after Audit Log example on hibernate site. Hibernate Interceptor code has following method


public void postFlush(Iterator iterator) {
// Here BEFORE INSERTING THE LOG RECORD I WOULD LIKE
// to access the information I had stored in some object while
// executing above application code.

for (Iterator itr = inserts.iterator(); itr.hasNext();) {
LogRecord logRecord = (LogRecord) itr.next();
session.save(logRecord);
}

}

If you're using Spring, this can be achieved with a custom-scoped or session-scoped spring bean (of source, you'll have to get access to the Spring app context from the listener, but htat's your deal).

If you're rolling your own infrastructure, most people achieve this with a static ThreadLocal.

I'm not sure if Hibernate has any actual support for this build in.

I don't know if you know this but you could set the interceptor at Session level. So everytime you create a new Session you pass a new Interceptor which has the User Name and Transacction ID.

Interceptor interceptor = new MyInterceptor (username, transactionId);
session = sessionFactory.openSession (interceptor);

Néstor

stolley, nestorjb,

Thanks for the help. Both the approaches will work. I am using spring so do can not instantiate Interceptor .

I am using a request scoped bean to pass the information, and Interceptor has to implement ApplicationContextAware to read request scoped stuff from the context.

When I was doing what you're doing (from a JPA listener) - I just jammed the ApplicationContext into a static variable on the listener at application boot-up time (from a Servlet Lifecycle listener).

well you can also extend the session class and can provied you specific implementation there also