001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022package org.granite.tide.seam.lazy;
023
024import static org.jboss.seam.annotations.Install.FRAMEWORK;
025
026import javax.persistence.EntityManager;
027
028import org.granite.tide.TidePersistenceManager;
029import org.hibernate.Session;
030import org.jboss.seam.Component;
031import org.jboss.seam.ScopeType;
032import org.jboss.seam.annotations.Install;
033import org.jboss.seam.annotations.Name;
034import org.jboss.seam.annotations.Scope;
035import org.jboss.seam.annotations.intercept.BypassInterceptors;
036
037/**
038 * Initializes a request for a passed in entity and a lazy property.
039 
040 * @author CIngram,VDanda
041 */
042@Name("org.granite.tide.seam.seamInitializer")
043@Scope(ScopeType.CONVERSATION)
044@Install(precedence=FRAMEWORK+1, classDependencies="org.hibernate.Session")
045@BypassInterceptors
046public class SeamHibernateInitializer extends SeamInitializer {
047
048    private static final long serialVersionUID = 1L;
049        
050        
051        /**
052         * Try to determine what type of persistence the application is using. 
053         * If the EntityManager is stored under entityManager or if the Hibernate session is 
054         * stored under session. Then the context will be found and used. This is only called if a 
055         * ITidePersistenceManager is not found, probably because the query was not run in a conversation.
056         * @return The appropriate manager for the persistence context being used, if it can be determined
057         * otherwise a null is returned. 
058         */  
059    @Override
060        protected TidePersistenceManager tryToDetermineInitiailzer() {
061        EntityManager em = findEntityManager();
062        if (em != null) 
063            return TideHibernatePersistenceFactory.createTidePersistence(null, em);
064
065                Session session = findHibernateSession();
066                if (session != null)
067                        return TideHibernatePersistenceFactory.createTidePersistence(null, session);
068                
069                return null;
070        }
071        
072    
073        /**
074         * Try to find the hibernateSession if possible. Assume that the session is stored under
075         * session.
076         * @return The Current Session
077         */
078        private Session findHibernateSession() {
079                return (Session) Component.getInstance("session");
080        }
081}
082