/*
* Copyright 2002-2007 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.apache.openjpa.persistence.OpenJPAEntityManager;
import org.apache.openjpa.persistence.OpenJPAPersistence;
import org.springframework.jdbc.datasource.ConnectionHandle;
import org.springframework.jdbc.datasource.ConnectionHolder;
import org.springframework.jdbc.support.JdbcUtils;
import org.springframework.orm.jpa.DefaultJpaDialect;
import org.springframework.transaction.SavepointManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionException;
/**
* {@link org.springframework.orm.jpa.JpaDialect} implementation for
* Apache OpenJPA. Developed and tested against OpenJPA 0.9.7.
*
* @author Costin Leau
* @author Juergen Hoeller
* @since 2.0
*/
public class OpenJpaDialect extends DefaultJpaDialect {
@Override
public Object beginTransaction(EntityManager entityManager, TransactionDefinition definition)
throws PersistenceException, SQLException, TransactionException {
super.beginTransaction(entityManager, definition);
OpenJPAEntityManager em = getOpenJPAEntityManager(entityManager);
if (!definition.isReadOnly()) {
// Like with TopLink, make sure to start the logic transaction early so that other
// participants using the connection (such as JdbcTemplate) run in a transaction.
em.beginStore();
}
return new OpenJpaTransactionData(em);
}
@Override
public ConnectionHandle getJdbcConnection(EntityManager entityManager, boolean readOnly)
throws PersistenceException, SQLException {
return new OpenJpaConnectionHandle(getOpenJPAEntityManager(entityManager));
}
/**
* Return the OpenJPA-specific interface of <code>EntityManager</code>.
* @param em the generic <code>EntityManager</code> instance
* @return the OpenJPA-specific interface of <code>EntityManager</code>
*/
protected OpenJPAEntityManager getOpenJPAEntityManager(EntityManager em) {
return OpenJPAPersistence.cast(em);
}
/**
* Transaction data Object exposed from <code>beginTransaction</code>,
* implementing the SavepointManager interface.
*/
private static class OpenJpaTransactionData implements SavepointManager {
private final OpenJPAEntityManager entityManager;
private int savepointCounter = 0;
public OpenJpaTransactionData(OpenJPAEntityManager entityManager) {
this.entityManager = entityManager;
}
public Object createSavepoint() throws TransactionException {
this.savepointCounter++;
String savepointName = ConnectionHolder.SAVEPOINT_NAME_PREFIX + this.savepointCounter;
this.entityManager.setSavepoint(savepointName);
return savepointName;
}
public void rollbackToSavepoint(Object savepoint) throws TransactionException {
this.entityManager.rollbackToSavepoint((String) savepoint);
}
public void releaseSavepoint(Object savepoint) throws TransactionException {
this.entityManager.releaseSavepoint((String) savepoint);
}
}
/**
* ConnectionHandle implementation that fetches a new OpenJPA-provided Connection
* for every <code>getConnection</code> call and closes the Connection on
* <code>releaseConnection</code>. This is necessary because OpenJPA requires the
* fetched Connection to be closed before continuing EntityManager work.
* @see org.apache.openjpa.persistence.OpenJPAEntityManager#getConnection()
*/
private static class OpenJpaConnectionHandle implements ConnectionHandle {
private final OpenJPAEntityManager entityManager;
public OpenJpaConnectionHandle(OpenJPAEntityManager entityManager) {
this.entityManager = entityManager;
}
public Connection getConnection() {
return (Connection) this.entityManager.getConnection();
}
public void releaseConnection(Connection con) {
JdbcUtils.closeConnection(con);
}
}
}
|