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Hibernate example source code file (EagerKeyManyToOneTest.java)

This example Hibernate source code file (EagerKeyManyToOneTest.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

acme, customer, customer, inc, order, order, overflowcondition, override, override, session, sessionfactoryimplementor, sessionfactoryserviceregistry, sessionfactoryserviceregistry, test

The Hibernate EagerKeyManyToOneTest.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 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.test.keymanytoone.bidir.component;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;
import org.hibernate.cfg.Environment;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.event.spi.EventType;
import org.hibernate.event.spi.LoadEvent;
import org.hibernate.event.spi.LoadEventListener;
import org.hibernate.event.internal.DefaultLoadEventListener;
import org.hibernate.event.service.spi.EventListenerRegistry;
import org.hibernate.integrator.spi.IntegratorService;
import org.hibernate.service.internal.BasicServiceRegistryImpl;
import org.hibernate.service.spi.SessionFactoryServiceRegistry;
import org.hibernate.integrator.spi.Integrator;
import org.hibernate.metamodel.source.MetadataImplementor;
import org.junit.Test;

import org.hibernate.testing.TestForIssue;
import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

/**
 * @author Steve Ebersole
 */
@SuppressWarnings( {"unchecked"})
public class EagerKeyManyToOneTest extends BaseCoreFunctionalTestCase {
	@Override
    public String[] getMappings() {
		return new String[] { "keymanytoone/bidir/component/EagerMapping.hbm.xml" };
	}

	@Override
    public void configure(Configuration cfg) {
		super.configure( cfg );
		cfg.setProperty( Environment.GENERATE_STATISTICS, "true" );
	}

	@Override
	protected void applyServices(BasicServiceRegistryImpl serviceRegistry) {
		super.applyServices( serviceRegistry );

		serviceRegistry.getService( IntegratorService.class ).addIntegrator(
				new Integrator() {

				    @Override
					public void integrate(
							Configuration configuration,
							SessionFactoryImplementor sessionFactory,
							SessionFactoryServiceRegistry serviceRegistry) {
                        integrate(serviceRegistry);
					}

                    @Override
				    public void integrate( MetadataImplementor metadata,
				                           SessionFactoryImplementor sessionFactory,
				                           SessionFactoryServiceRegistry serviceRegistry ) {
                        integrate(serviceRegistry);
				    }

                    private void integrate( SessionFactoryServiceRegistry serviceRegistry ) {
                        serviceRegistry.getService( EventListenerRegistry.class ).prependListeners(EventType.LOAD,
                                                                                                   new CustomLoadListener());
                    }

					@Override
					public void disintegrate(
							SessionFactoryImplementor sessionFactory, SessionFactoryServiceRegistry serviceRegistry) {
					}
				}
		);
	}

	@Test
	public void testSaveCascadedToKeyManyToOne() {
		sessionFactory().getStatistics().clear();

		// test cascading a save to an association with a key-many-to-one which refers to a
		// just saved entity
		Session s = openSession();
		s.beginTransaction();
		Customer cust = new Customer( "Acme, Inc." );
		Order order = new Order( new Order.Id( cust, 1 ) );
		cust.getOrders().add( order );
		s.save( cust );
		s.flush();
		assertEquals( 2, sessionFactory().getStatistics().getEntityInsertCount() );
		s.delete( cust );
		s.getTransaction().commit();
		s.close();
	}

	@Test
	public void testLoadingStrategies() {
		sessionFactory().getStatistics().clear();

		Session s = openSession();
		s.beginTransaction();
		Customer cust = new Customer( "Acme, Inc." );
		Order order = new Order( new Order.Id( cust, 1 ) );
		cust.getOrders().add( order );
		s.save( cust );
		s.getTransaction().commit();
		s.close();

		s = openSession();
		s.beginTransaction();

		cust = ( Customer ) s.createQuery( "from Customer" ).uniqueResult();
		assertEquals( 1, cust.getOrders().size() );
		s.clear();

		cust = ( Customer ) s.createQuery( "from Customer c join fetch c.orders" ).uniqueResult();
		assertEquals( 1, cust.getOrders().size() );
		s.clear();

		cust = ( Customer ) s.createQuery( "from Customer c join fetch c.orders as o join fetch o.id.customer" ).uniqueResult();
		assertEquals( 1, cust.getOrders().size() );
		s.clear();

		cust = ( Customer ) s.createCriteria( Customer.class ).uniqueResult();
		assertEquals( 1, cust.getOrders().size() );
		s.clear();

		s.delete( cust );
		s.getTransaction().commit();
		s.close();
	}

	@Test
	@TestForIssue( jiraKey = "HHH-2277")
	public void testLoadEntityWithEagerFetchingToKeyManyToOneReferenceBackToSelf() {
		sessionFactory().getStatistics().clear();

		// long winded method name to say that this is a test specifically for HHH-2277 ;)
		// essentially we have a bidirectional association where one side of the
		// association is actually part of a composite PK.
		//
		// The way these are mapped causes the problem because both sides
		// are defined as eager which leads to the infinite loop; if only
		// one side is marked as eager, then all is ok.  In other words the
		// problem arises when both pieces of instance data are coming from
		// the same result set.  This is because no "entry" can be placed
		// into the persistence context for the association with the
		// composite key because we are in the process of trying to build
		// the composite-id instance
		Session s = openSession();
		s.beginTransaction();
		Customer cust = new Customer( "Acme, Inc." );
		Order order = new Order( new Order.Id( cust, 1 ) );
		cust.getOrders().add( order );
		s.save( cust );
		s.getTransaction().commit();
		s.close();

		s = openSession();
		s.beginTransaction();
		try {
			cust = ( Customer ) s.get( Customer.class, cust.getId() );
		}
		catch( OverflowCondition overflow ) {
			fail( "get()/load() caused overflow condition" );
		}
		s.delete( cust );
		s.getTransaction().commit();
		s.close();
	}

	private static class OverflowCondition extends RuntimeException {
	}

	private static class CustomLoadListener extends DefaultLoadEventListener {
		private int internalLoadCount = 0;
		@Override
        public void onLoad(LoadEvent event, LoadType loadType) throws HibernateException {
			if ( LoadEventListener.INTERNAL_LOAD_EAGER.getName().equals( loadType.getName() ) ) {
				internalLoadCount++;
				if ( internalLoadCount > 10 ) {
					throw new OverflowCondition();
				}
			}
			super.onLoad( event, loadType );
			internalLoadCount--;
		}
	}
}

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