// Copyright 2011 The Apache Software Foundation
//
// 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.apache.tapestry5.internal.jpa;
import java.io.InputStream;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.spi.PersistenceProvider;
import javax.persistence.spi.PersistenceProviderResolver;
import javax.persistence.spi.PersistenceProviderResolverHolder;
import javax.persistence.spi.PersistenceUnitInfo;
import org.apache.tapestry5.ioc.Resource;
import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
import org.apache.tapestry5.ioc.internal.util.InternalUtils;
import org.apache.tapestry5.ioc.services.RegistryShutdownListener;
import org.apache.tapestry5.jpa.EntityManagerSource;
import org.apache.tapestry5.jpa.JpaConstants;
import org.apache.tapestry5.jpa.PersistenceUnitConfigurer;
import org.apache.tapestry5.jpa.TapestryPersistenceUnitInfo;
import org.slf4j.Logger;
public class EntityManagerSourceImpl implements EntityManagerSource, RegistryShutdownListener
{
private final Map<String, EntityManagerFactory> entityManagerFactories = CollectionFactory
.newMap();
private final Logger logger;
private final List<TapestryPersistenceUnitInfo> persistenceUnitInfos;
public EntityManagerSourceImpl(final Logger logger, final Resource persistenceDescriptor, PersistenceUnitConfigurer packageNamePersistenceUnitConfigurer,
final Map<String, PersistenceUnitConfigurer> configuration)
{
super();
this.logger = logger;
List<TapestryPersistenceUnitInfo> persistenceUnitInfos = parsePersistenceUnitInfos(persistenceDescriptor);
final Map<String, PersistenceUnitConfigurer> remainingConfigurations = configure(configuration, persistenceUnitInfos);
configureRemaining(persistenceUnitInfos, remainingConfigurations);
if(persistenceUnitInfos.size() == 1)
packageNamePersistenceUnitConfigurer.configure(persistenceUnitInfos.get(0));
this.persistenceUnitInfos = persistenceUnitInfos;
}
private List<TapestryPersistenceUnitInfo> parsePersistenceUnitInfos(Resource persistenceDescriptor)
{
List<TapestryPersistenceUnitInfo> persistenceUnitInfos = CollectionFactory.newList();
if(persistenceDescriptor.exists())
{
final PersistenceParser parser = new PersistenceParser();
InputStream inputStream = null;
try
{
inputStream = persistenceDescriptor.openStream();
persistenceUnitInfos = parser.parse(inputStream);
}
catch(Exception e)
{
throw new RuntimeException(e);
}
finally
{
InternalUtils.close(inputStream);
}
}
return persistenceUnitInfos;
}
private Map<String, PersistenceUnitConfigurer> configure(Map<String, PersistenceUnitConfigurer> configuration, List<TapestryPersistenceUnitInfo> persistenceUnitInfos)
{
final Map<String, PersistenceUnitConfigurer> remainingConfigurations = CollectionFactory.newMap(configuration);
for (final TapestryPersistenceUnitInfo info : persistenceUnitInfos)
{
final String unitName = info.getPersistenceUnitName();
final PersistenceUnitConfigurer configurer = configuration.get(unitName);
if (configurer != null)
{
configurer.configure(info);
remainingConfigurations.remove(unitName) ;
}
}
return remainingConfigurations;
}
private void configureRemaining(List<TapestryPersistenceUnitInfo> persistenceUnitInfos, Map<String, PersistenceUnitConfigurer> remainingConfigurations)
{
for(Entry<String, PersistenceUnitConfigurer> entry: remainingConfigurations.entrySet())
{
final PersistenceUnitInfoImpl info = new PersistenceUnitInfoImpl(entry.getKey());
final PersistenceUnitConfigurer configurer = entry.getValue();
configurer.configure(info);
persistenceUnitInfos.add(info);
}
}
/**
* {@inheritDoc}
*/
public EntityManagerFactory getEntityManagerFactory(final String persistenceUnitName)
{
EntityManagerFactory emf = entityManagerFactories.get(persistenceUnitName);
if (emf == null)
{
emf = createEntityManagerFactory(persistenceUnitName);
entityManagerFactories.put(persistenceUnitName, emf);
}
return emf;
}
private EntityManagerFactory createEntityManagerFactory(final String persistenceUnitName)
{
final PersistenceProvider persistenceProvider = getPersistenceProvider();
for (final TapestryPersistenceUnitInfo info : persistenceUnitInfos)
{
if (info.getPersistenceUnitName().equals(persistenceUnitName))
{
final Map<String, String> properties = CollectionFactory.newCaseInsensitiveMap();
properties.put(JpaConstants.PERSISTENCE_UNIT_NAME, persistenceUnitName);
return persistenceProvider.createContainerEntityManagerFactory(info, properties);
}
}
throw new IllegalStateException(String.format(
"Failed to create EntityManagerFactory for persistence unit '%s'",
persistenceUnitName));
}
private PersistenceProvider getPersistenceProvider()
{
final PersistenceProviderResolver resolver = PersistenceProviderResolverHolder
.getPersistenceProviderResolver();
final List<PersistenceProvider> providers = resolver.getPersistenceProviders();
if (providers.isEmpty())
throw new IllegalStateException(
"No PersistenceProvider implementation available in the runtime environment.");
return providers.get(0);
}
public EntityManager create(final String persistenceUnitName)
{
return getEntityManagerFactory(persistenceUnitName).createEntityManager();
}
public void registryDidShutdown()
{
final Set<Entry<String, EntityManagerFactory>> entrySet = entityManagerFactories.entrySet();
for (final Entry<String, EntityManagerFactory> entry : entrySet)
{
final EntityManagerFactory emf = entry.getValue();
try
{
emf.close();
}
catch (final Exception e)
{
logger.error(String.format(
"Failed to close EntityManagerFactory for persistence unit '%s'",
entry.getKey()), e);
}
}
entityManagerFactories.clear();
}
public List<PersistenceUnitInfo> getPersistenceUnitInfos()
{
return Collections.<PersistenceUnitInfo> unmodifiableList(persistenceUnitInfos);
}
}