com.netsteadfast.greenstep.base.sys.HibernateExtendedJpaDialect.java Source code

Introduction

Here is the source code for com.netsteadfast.greenstep.base.sys.HibernateExtendedJpaDialect.java

Source

/* 
 * Copyright 2012-2016 bambooCORE, greenstep of copyright Chen Xin Nien
 * 
 * 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.
 * 
 * -----------------------------------------------------------------------
 * 
 * author:    Chen Xin Nien
 * contact: chen.xin.nien@gmail.com
 * 
 */
package com.netsteadfast.greenstep.base.sys;

import java.sql.Connection;
import java.sql.SQLException;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceException;

import org.apache.log4j.Logger;
import org.hibernate.Session;
import org.hibernate.jdbc.Work;
import org.springframework.jdbc.datasource.DataSourceUtils;
import org.springframework.orm.jpa.vendor.HibernateJpaDialect;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionException;

/**
 * ? exceptionStack    org.springframework.transaction.InvalidIsolationLevelException: Standard JPA does not support custom isolation levels - use a special 
 * ?
 */
public class HibernateExtendedJpaDialect extends HibernateJpaDialect {
    private static final long serialVersionUID = -5505680328318555204L;
    private Logger logger = Logger.getLogger(HibernateExtendedJpaDialect.class);

    @Override
    public Object beginTransaction(final EntityManager entityManager, final TransactionDefinition definition)
            throws PersistenceException, SQLException, TransactionException {

        Session session = (Session) entityManager.getDelegate();
        if (definition.getTimeout() != TransactionDefinition.TIMEOUT_DEFAULT) {
            getSession(entityManager).getTransaction().setTimeout(definition.getTimeout());
        }
        entityManager.getTransaction().begin();
        logger.debug("Transaction started");
        session.doWork(new Work() {
            @Override
            public void execute(Connection connection) throws SQLException {
                logger.debug("The connection instance is " + connection.toString());
                logger.debug("The isolation level of the connection is " + connection.getTransactionIsolation()
                        + " and the isolation level set on the transaction is " + definition.getIsolationLevel());
                DataSourceUtils.prepareConnectionForTransaction(connection, definition);
            }
        });
        return prepareTransaction(entityManager, definition.isReadOnly(), definition.getName());
    }

}