Hibernate example source code file (TransactionImpl.java)

This example Hibernate source code file (TransactionImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

exception, exception, hibernateentitymanagerimplementor, hibernateexception, hibernateexception, illegalstateexception, illegalstateexception, persistenceexception, rollbackexception, session, throwable, transaction, transaction, transactionimpl

The Hibernate TransactionImpl.java source code

/*
 * Copyright (c) 2009, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */

//$Id$
package org.hibernate.ejb;
import javax.persistence.EntityTransaction;
import javax.persistence.PersistenceException;
import javax.persistence.RollbackException;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;

/**
 * @author Gavin King
 * @author Emmanuel Bernard
 */
public class TransactionImpl implements EntityTransaction {

	private HibernateEntityManagerImplementor entityManager;
	private Transaction tx;
	private boolean rollbackOnly;

	public TransactionImpl(AbstractEntityManagerImpl entityManager) {
		this.entityManager = entityManager;
	}

	private Session getSession() {
		return entityManager.getSession();
	}

	public void begin() {
		try {
			rollbackOnly = false;
			if ( tx != null && tx.isActive() ) {
				throw new IllegalStateException( "Transaction already active" );
			}
			//entityManager.adjustFlushMode();
			tx = getSession().beginTransaction();
		}
		catch (HibernateException he) {
			entityManager.throwPersistenceException( he );
		}
	}

	public void commit() {
		if ( tx == null || !tx.isActive() ) {
			throw new IllegalStateException( "Transaction not active" );
		}
		if ( rollbackOnly ) {
			tx.rollback();
			throw new RollbackException( "Transaction marked as rollbackOnly" );
		}
		try {
			tx.commit();
		}
		catch (Exception e) {
			Exception wrappedException;
			if (e instanceof HibernateException) {
				wrappedException = entityManager.convert( (HibernateException)e );
			}
			else {
				wrappedException = e;
			}
			try {
				//as per the spec we should rollback if commit fails
				tx.rollback();
			}
			catch (Exception re) {
				//swallow
			}
			throw new RollbackException( "Error while committing the transaction", wrappedException );
		}
		finally {
			rollbackOnly = false;
		}
		//if closed and we commit, the mode should have been adjusted already
		//if ( entityManager.isOpen() ) entityManager.adjustFlushMode();
	}

	public void rollback() {
		if ( tx == null || !tx.isActive() ) {
			throw new IllegalStateException( "Transaction not active" );
		}
		try {
			tx.rollback();
		}
		catch (Exception e) {
			throw new PersistenceException( "unexpected error when rollbacking", e );
		}
		finally {
			try {
				if (entityManager !=  null) {
					Session session = getSession();
					if ( session != null && session.isOpen() ) session.clear();
				}
			}
			catch (Throwable t) {
				//we don't really care here since it's only for safety purpose
			}
			rollbackOnly = false;
		}
	}

	public void setRollbackOnly() {
		if ( ! isActive() ) throw new IllegalStateException( "Transaction not active" );
		this.rollbackOnly = true;
	}

	public boolean getRollbackOnly() {
		if ( ! isActive() ) throw new IllegalStateException( "Transaction not active" );
		return rollbackOnly;
	}

	public boolean isActive() {
		try {
			return tx != null && tx.isActive();
		}
		catch (RuntimeException e) {
			throw new PersistenceException( "unexpected error when checking transaction status", e );
		}
	}

}