Hibernate example source code file (EntityManagerImpl.java)

This example Hibernate source code file (EntityManagerImpl.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

class, class, entitymanager, entitymanagerimpl, illegalstateexception, interceptor, override, persistenceexception, persistenceexception, session, session, string, transaction, unable, unable, util

The Hibernate EntityManagerImpl.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2009-2011, Red Hat Inc. 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 Inc.
 *
 * 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
 */
package org.hibernate.ejb;

import javax.persistence.PersistenceContextType;
import javax.persistence.PersistenceException;
import javax.persistence.spi.PersistenceUnitTransactionType;
import javax.transaction.Synchronization;
import java.util.Map;

import org.jboss.logging.Logger;

import org.hibernate.HibernateException;
import org.hibernate.Interceptor;
import org.hibernate.Session;
import org.hibernate.SessionBuilder;
import org.hibernate.annotations.common.util.ReflectHelper;
import org.hibernate.cfg.Environment;
import org.hibernate.ejb.internal.EntityManagerMessageLogger;
import org.hibernate.engine.spi.SessionImplementor;

/**
 * Hibernate implementation of {@link javax.persistence.EntityManager}.
 *
 * @author Gavin King
 */
public class EntityManagerImpl extends AbstractEntityManagerImpl {

    public static final EntityManagerMessageLogger LOG = Logger.getMessageLogger(EntityManagerMessageLogger.class,
                                                                          EntityManagerImpl.class.getName());

	protected Session session;
	protected boolean open;
	protected boolean discardOnClose;
	private Class sessionInterceptorClass;

	public EntityManagerImpl(
			EntityManagerFactoryImpl entityManagerFactory,
			PersistenceContextType pcType,
			PersistenceUnitTransactionType transactionType,
			boolean discardOnClose,
			Class sessionInterceptorClass,
			Map properties) {
		super( entityManagerFactory, pcType, transactionType, properties );
		this.open = true;
		this.discardOnClose = discardOnClose;
		Object localSessionInterceptor = null;
		if (properties != null) {
			localSessionInterceptor = properties.get( AvailableSettings.SESSION_INTERCEPTOR );
		}
		if ( localSessionInterceptor != null ) {
			if (localSessionInterceptor instanceof Class) {
				sessionInterceptorClass = (Class) localSessionInterceptor;
			}
			else if (localSessionInterceptor instanceof String) {
				try {
					sessionInterceptorClass =
							ReflectHelper.classForName( (String) localSessionInterceptor, EntityManagerImpl.class );
				}
				catch (ClassNotFoundException e) {
					throw new PersistenceException("Unable to instanciate interceptor: " + localSessionInterceptor, e);
				}
			}
			else {
				throw new PersistenceException("Unable to instanciate interceptor: " + localSessionInterceptor);
			}
		}
		this.sessionInterceptorClass = sessionInterceptorClass;
		postInit();
	}

	@Override
    public Session getSession() {
		if ( !open ) {
			throw new IllegalStateException( "EntityManager is closed" );
		}
		return getRawSession();
	}

	@Override
    protected Session getRawSession() {
		if ( session == null ) {
			SessionBuilder sessionBuilder = getEntityManagerFactory().getSessionFactory().withOptions();
			if (sessionInterceptorClass != null) {
				try {
					Interceptor interceptor = (Interceptor) sessionInterceptorClass.newInstance();
					sessionBuilder.interceptor( interceptor );
				}
				catch (InstantiationException e) {
					throw new PersistenceException("Unable to instanciate session interceptor: " + sessionInterceptorClass, e);
				}
				catch (IllegalAccessException e) {
					throw new PersistenceException("Unable to instanciate session interceptor: " + sessionInterceptorClass, e);
				}
				catch (ClassCastException e) {
					throw new PersistenceException("Session interceptor does not implement Interceptor: " + sessionInterceptorClass, e);
				}
			}
			sessionBuilder.autoJoinTransactions( getTransactionType() != PersistenceUnitTransactionType.JTA );
			session = sessionBuilder.openSession();
			if ( persistenceContextType == PersistenceContextType.TRANSACTION ) {
				( (SessionImplementor) session ).setAutoClear( true );
			}
		}
		return session;
	}

	public void close() {
		if ( !open ) {
			throw new IllegalStateException( "EntityManager is closed" );
		}
		if ( !discardOnClose && isTransactionInProgress() ) {
			//delay the closing till the end of the enlisted transaction
            getSession().getTransaction().registerSynchronization(new Synchronization() {
                public void beforeCompletion() {
                    // nothing to do
                }

				public void afterCompletion( int i ) {
                    if (session != null) if (session.isOpen()) {
                        LOG.debugf("Closing entity manager after transaction completion");
                        session.close();
                    } else LOG.entityManagerClosedBySomeoneElse(Environment.AUTO_CLOSE_SESSION);
                    // TODO session == null should not happen
                }
            });
		}
		else {
			//close right now
			if ( session != null ) {
				session.close();
			}
		}
		open = false;
	}

	public boolean isOpen() {
		//adjustFlushMode(); //don't adjust, can't be done on closed EM
		try {
			if ( open ) {
				getSession().isOpen(); //to force enlistment in tx
			}
			return open;
		}
		catch (HibernateException he) {
			throwPersistenceException( he );
			return false;
		}
	}

}