001 /* 002 Copyright (C) 2001-2003 Lionel Seinturier <Lionel.Seinturier@lip6.fr> 003 004 This program is free software; you can redistribute it and/or modify 005 it under the terms of the GNU Lesser General Public License as 006 published by the Free Software Foundation; either version 2 of the 007 License, or (at your option) any later version. 008 009 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU Lesser General Public License for more details. 013 014 You should have received a copy of the GNU Lesser General Public License 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ 017 018 package org.objectweb.jac.aspects.hibernate; 019 020 import java.util.Iterator; 021 import java.util.List; 022 023 import net.sf.hibernate.HibernateException; 024 import net.sf.hibernate.ObjectNotFoundException; 025 import net.sf.hibernate.Session; 026 027 import org.aopalliance.intercept.ConstructorInvocation; 028 import org.aopalliance.intercept.MethodInvocation; 029 import org.objectweb.jac.core.AspectComponent; 030 import org.objectweb.jac.core.Interaction; 031 import org.objectweb.jac.core.NameRepository; 032 import org.objectweb.jac.core.Wrapper; 033 import org.objectweb.jac.util.Repository; 034 035 /** 036 * This wrapper delimits the begining of a persistent session. 037 * 038 * @author Lionel Seinturier <Lionel.Seinturier@lip6.fr> 039 * @version 1.0 040 */ 041 public class BeginPersistentSessionWrapper extends Wrapper { 042 043 /** The gateway instance to Hibernate. */ 044 private HibernateHelper hh = HibernateHelper.get(); 045 046 public BeginPersistentSessionWrapper( AspectComponent ac ) { 047 super(ac); 048 } 049 050 /** 051 * Wrapping method around pointcuts 052 * where a persistent session begins. 053 */ 054 public Object invoke( MethodInvocation invocation ) { 055 Interaction interaction = (Interaction) invocation; 056 try { 057 return _begin(interaction); 058 } catch (HibernateException e) { 059 e.printStackTrace(); 060 System.exit(1); 061 } 062 return null; 063 } 064 private Object _begin( Interaction interaction ) throws HibernateException { 065 066 hh.openSessionAndBeginTx(); 067 Session session = hh.getSession(); 068 069 /** 070 * Load all persistent objects. 071 * If they do not exist yet in the storage, 072 * create an entry for them (save). 073 */ 074 HibernateAC hac = (HibernateAC) ac; 075 List pObjects = hac.getPersistentObjects(); 076 for ( Iterator iter=pObjects.iterator() ; iter.hasNext() ; ) { 077 078 String name = (String) iter.next(); 079 Object object = names.getObject(name); 080 081 try { 082 session.load(object,name); 083 } catch (ObjectNotFoundException e) { 084 session.save(object,name); 085 } 086 } 087 088 /** 089 * Proceed the interaction. 090 */ 091 return proceed(interaction); 092 } 093 094 095 /** 096 * The reference towards the JAC name repository. 097 */ 098 private Repository names = NameRepository.get(); 099 100 public Object construct(ConstructorInvocation invocation) 101 throws Throwable { 102 throw new Exception("This wrapper does not support constructor wrapping"); 103 } 104 }