/*
* Hibernate OGM, Domain model persistence for NoSQL datastores
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.ogm.datastore.map.impl;
import java.io.Serializable;
import org.hibernate.JDBCException;
import org.hibernate.LockMode;
import org.hibernate.StaleObjectStateException;
import org.hibernate.dialect.lock.LockingStrategy;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.ogm.datastore.spi.DatastoreProvider;
import org.hibernate.ogm.grid.EntityKey;
import org.hibernate.ogm.persister.EntityKeyBuilder;
import org.hibernate.ogm.persister.OgmEntityPersister;
import org.hibernate.ogm.type.GridType;
import org.hibernate.ogm.type.TypeTranslator;
import org.hibernate.ogm.util.impl.Log;
import org.hibernate.ogm.util.impl.LoggerFactory;
import org.hibernate.persister.entity.Lockable;
/**
* @author Sanne Grinovero <sanne@hibernate.org> (C) 2011 Red Hat Inc.
* @author Emmanuel Bernard <emmanuel@hibernate.org>
*/
public class MapPessimisticWriteLockingStrategy implements LockingStrategy {
private static final Log log = LoggerFactory.make();
protected final Lockable lockable;
protected final LockMode lockMode;
protected final GridType identifierGridType;
private volatile MapDatastoreProvider provider;
public MapPessimisticWriteLockingStrategy(Lockable lockable, LockMode lockMode) {
this.lockable = lockable;
this.lockMode = lockMode;
TypeTranslator typeTranslator = lockable.getFactory().getServiceRegistry().getService( TypeTranslator.class );
this.identifierGridType = typeTranslator.getType( lockable.getIdentifierType() );
}
@Override
public void lock(Serializable id, Object version, Object object, int timeout, SessionImplementor session) throws StaleObjectStateException, JDBCException {
MapDatastoreProvider dataStore = getProvider( session );
EntityKey key = EntityKeyBuilder.fromData(
( (OgmEntityPersister) lockable).getRootEntityKeyMetadata(),
identifierGridType,
id,
session );
dataStore.writeLock( key, timeout );
// FIXME check the version number as well and raise an optimistic lock exception if there is an issue JPA 2 spec: 3.4.4.2
// (Comment by Emmanuel)
}
protected final MapDatastoreProvider getProvider(SessionImplementor session) {
if ( provider == null ) {
DatastoreProvider service = session.getFactory().getServiceRegistry().getService( DatastoreProvider.class );
if ( service instanceof MapDatastoreProvider ) {
provider = (MapDatastoreProvider) service;
}
else {
log.unexpectedDatastoreProvider( service.getClass(), MapDatastoreProvider.class );
}
}
return provider;
}
}