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Hibernate's entity version (audit/history) support
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.envers.event.spi;
import org.hibernate.envers.boot.internal.EnversService;
import org.hibernate.envers.internal.synchronization.AuditProcess;
import org.hibernate.envers.internal.synchronization.work.AuditWorkUnit;
import org.hibernate.envers.internal.synchronization.work.ModWorkUnit;
import org.hibernate.event.spi.PostUpdateEvent;
import org.hibernate.event.spi.PostUpdateEventListener;
import org.hibernate.persister.entity.EntityPersister;
/**
* Envers-specific entity (post) update event listener
*
* @author Adam Warski (adam at warski dot org)
* @author HernпїЅn Chanfreau
* @author Steve Ebersole
* @author Chris Cranford
*/
public class EnversPostUpdateEventListenerImpl extends BaseEnversUpdateEventListener implements PostUpdateEventListener {
public EnversPostUpdateEventListenerImpl(EnversService enversService) {
super( enversService );
}
@Override
public void onPostUpdate(PostUpdateEvent event) {
final String entityName = event.getPersister().getEntityName();
if ( getEnversService().getEntitiesConfigurations().isVersioned( entityName ) ) {
checkIfTransactionInProgress( event.getSession() );
final AuditProcess auditProcess = getEnversService().getAuditProcessManager().get( event.getSession() );
Object[] oldState = getOldDBState( auditProcess, entityName, event );
final Object[] newDbState = postUpdateDBState( event );
final AuditWorkUnit workUnit = new ModWorkUnit(
event.getSession(),
event.getPersister().getEntityName(),
getEnversService(),
event.getId(),
event.getPersister(),
newDbState,
oldState
);
auditProcess.addWorkUnit( workUnit );
if ( workUnit.containsWork() ) {
generateBidirectionalCollectionChangeWorkUnits(
auditProcess,
event.getPersister(),
entityName,
newDbState,
oldState,
event.getSession()
);
}
}
}
private Object[] getOldDBState(AuditProcess auditProcess, String entityName, PostUpdateEvent event) {
if ( isDetachedEntityUpdate( entityName, event.getOldState() ) ) {
return auditProcess.getCachedEntityState( event.getId(), entityName );
}
return event.getOldState();
}
private Object[] postUpdateDBState(PostUpdateEvent event) {
final Object[] newDbState = event.getState().clone();
if ( event.getOldState() != null ) {
final EntityPersister entityPersister = event.getPersister();
for ( int i = 0; i < entityPersister.getPropertyNames().length; ++i ) {
if ( !entityPersister.getPropertyUpdateability()[i] ) {
// Assuming that PostUpdateEvent#getOldState() returns database state of the record before modification.
// Otherwise, we would have to execute SQL query to be sure of @Column(updatable = false) column value.
newDbState[i] = event.getOldState()[i];
}
}
}
return newDbState;
}
@Override
public boolean requiresPostCommitHanding(EntityPersister persister) {
return getEnversService().getEntitiesConfigurations().isVersioned( persister.getEntityName() );
}
}