/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008-2011, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.envers;
import javax.persistence.EntityManager;
import org.hibernate.Session;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.envers.event.EnversListener;
import org.hibernate.envers.exception.AuditException;
import org.hibernate.envers.reader.AuditReaderImpl;
import org.hibernate.event.EventType;
import org.hibernate.event.PostInsertEventListener;
import org.hibernate.service.event.spi.EventListenerRegistry;
/**
* @author Adam Warski (adam at warski dot org)
*/
public class AuditReaderFactory {
private AuditReaderFactory() { }
/**
* Create an audit reader associated with an open session.
* @param session An open session.
* @return An audit reader associated with the given sesison. It shouldn't be used
* after the session is closed.
* @throws AuditException When the given required listeners aren't installed.
*/
public static AuditReader get(Session session) throws AuditException {
SessionImplementor sessionImpl;
if (!(session instanceof SessionImplementor)) {
sessionImpl = (SessionImplementor) session.getSessionFactory().getCurrentSession();
} else {
sessionImpl = (SessionImplementor) session;
}
// todo : I wonder if there is a better means to do this via "named lookup" based on the session factory name/uuid
final EventListenerRegistry listenerRegistry = sessionImpl
.getFactory()
.getServiceRegistry()
.getService( EventListenerRegistry.class );
for ( PostInsertEventListener listener : listenerRegistry.getEventListenerGroup( EventType.POST_INSERT ).listeners() ) {
if ( listener instanceof EnversListener ) {
// todo : slightly different from original code in that I am not checking the other listener groups...
return new AuditReaderImpl(
( (EnversListener) listener ).getAuditConfiguration(),
session,
sessionImpl
);
}
}
throw new AuditException( "Envers listeners were not properly registered" );
}
/**
* Create an audit reader associated with an open entity manager.
* @param entityManager An open entity manager.
* @return An audit reader associated with the given entity manager. It shouldn't be used
* after the entity manager is closed.
* @throws AuditException When the given entity manager is not based on Hibernate, or if the required
* listeners aren't installed.
*/
public static AuditReader get(EntityManager entityManager) throws AuditException {
if (entityManager.getDelegate() instanceof Session) {
return get((Session) entityManager.getDelegate());
}
if (entityManager.getDelegate() instanceof EntityManager) {
return get((EntityManager) entityManager.getDelegate());
}
throw new AuditException("Hibernate EntityManager not present!");
}
}