001// Copyright 2011 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007// http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.internal.jpa;
016
017import java.util.Collections;
018import java.util.Map;
019import java.util.Map.Entry;
020
021import javax.persistence.EntityManager;
022import javax.persistence.spi.PersistenceUnitInfo;
023
024import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
025import org.apache.tapestry5.ioc.services.ThreadCleanupListener;
026import org.apache.tapestry5.jpa.EntityManagerManager;
027import org.apache.tapestry5.jpa.EntityManagerSource;
028import org.slf4j.Logger;
029
030public class EntityManagerManagerImpl implements EntityManagerManager, ThreadCleanupListener
031{
032    private final EntityManagerSource entityManagerSource;
033
034    private final Logger logger;
035
036    private final Map<String, EntityManager> entityManagers = CollectionFactory.newMap();
037
038    public EntityManagerManagerImpl(final EntityManagerSource entityManagerSource,
039            final Logger logger)
040    {
041        super();
042        this.entityManagerSource = entityManagerSource;
043        this.logger = logger;
044    }
045
046    /**
047     * {@inheritDoc}
048     */
049    public EntityManager getEntityManager(final String persistenceUnitName)
050    {
051        return getOrCreateEntityManager(persistenceUnitName);
052    }
053
054    /**
055     * {@inheritDoc}
056     */
057    public Map<String, EntityManager> getEntityManagers()
058    {
059        createAllEntityManagers();
060        
061        return Collections.unmodifiableMap(entityManagers);
062    }
063
064    private void createAllEntityManagers()
065    {
066        for (final PersistenceUnitInfo info : entityManagerSource.getPersistenceUnitInfos())
067        {
068            getOrCreateEntityManager(info.getPersistenceUnitName());
069        }
070    }
071
072    private EntityManager getOrCreateEntityManager(final String persistenceUnitName)
073    {
074        EntityManager em = entityManagers.get(persistenceUnitName);
075
076        if (em == null)
077        {
078            em = entityManagerSource.create(persistenceUnitName);
079
080            entityManagers.put(persistenceUnitName, em);
081        }
082
083        return em;
084    }
085
086    public void threadDidCleanup()
087    {
088        for (final Entry<String, EntityManager> next : entityManagers.entrySet())
089        {
090            try
091            {
092                final EntityManager em = next.getValue();
093
094                if (em.isOpen())
095                {
096                    em.close();
097                }
098            }
099            catch (final Exception e)
100            {
101                logger.info(String.format(
102                        "Failed to close EntityManager for persistence unit '%s'", next.getKey()));
103            }
104        }
105
106        entityManagers.clear();
107
108    }
109
110}