org.springframework.orm.jpa.vendor.HibernateJpaDialect Maven / Gradle / Ivy
/*
* Copyright 2002-2006 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.orm.jpa.vendor;
import java.sql.Connection;
import java.sql.SQLException;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceException;
import org.hibernate.FlushMode;
import org.hibernate.Session;
import org.hibernate.ejb.HibernateEntityManager;
import org.springframework.jdbc.datasource.ConnectionHandle;
import org.springframework.jdbc.datasource.SimpleConnectionHandle;
import org.springframework.orm.jpa.DefaultJpaDialect;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionException;
/**
* {@link org.springframework.orm.jpa.JpaDialect} implementation for
* Hibernate EntityManager. Developed and tested against Hibernate 3.2.
*
* @author Costin Leau
* @author Juergen Hoeller
* @since 2.0
*/
public class HibernateJpaDialect extends DefaultJpaDialect {
public Object beginTransaction(EntityManager entityManager, TransactionDefinition definition)
throws PersistenceException, SQLException, TransactionException {
super.beginTransaction(entityManager, definition);
Session session = getSession(entityManager);
FlushMode flushMode = session.getFlushMode();
FlushMode previousFlushMode = null;
if (definition.isReadOnly()) {
// We should suppress flushing for a read-only transaction.
session.setFlushMode(FlushMode.MANUAL);
previousFlushMode = flushMode;
}
else {
// We need AUTO or COMMIT for a non-read-only transaction.
if (flushMode.lessThan(FlushMode.COMMIT)) {
session.setFlushMode(FlushMode.AUTO);
previousFlushMode = flushMode;
}
}
return new SessionTransactionData(session, previousFlushMode);
}
public void cleanupTransaction(Object transactionData) {
((SessionTransactionData) transactionData).resetFlushMode();
}
@Override
public ConnectionHandle getJdbcConnection(EntityManager entityManager, boolean readOnly)
throws PersistenceException, SQLException {
Session session = getSession(entityManager);
Connection con = session.connection();
return (con != null ? new SimpleConnectionHandle(con) : null);
}
protected Session getSession(EntityManager em) {
return ((HibernateEntityManager) em).getSession();
}
private static class SessionTransactionData {
private final Session session;
private final FlushMode previousFlushMode;
public SessionTransactionData(Session session, FlushMode previousFlushMode) {
this.session = session;
this.previousFlushMode = previousFlushMode;
}
public void resetFlushMode() {
if (this.previousFlushMode != null) {
this.session.setFlushMode(this.previousFlushMode);
}
}
}
}