1 //----------------------------------------------------------------------
2 //
3 // PerfectJPattern: "Design patterns are good but components are better!"
4 // ManagedDaoSessionStrategy.java Copyright (c) 2009 Giovanni Azua Garcia
5 // bravegag@hotmail.com
6 //
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License
9 // as published by the Free Software Foundation; either version 3
10 // of the License, or (at your option) any later version.
11 //
12 // This program is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
16 //
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, see <http://www.gnu.org/licenses/>.
19 //
20 //----------------------------------------------------------------------
21 package org.perfectjpattern.jee.integration.dao;
22
23 import javax.persistence.*;
24
25 import org.perfectjpattern.core.api.structural.adapter.*;
26 import org.perfectjpattern.jee.api.integration.dao.*;
27
28 /**
29 * Concrete implementation of {@link ISessionStrategy} targeting
30 * the Ejb managed environment
31 *
32 * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a>
33 * @version $Revision: 1.0 $Date: Feb 8, 2009 5:24:51 PM $
34 */
35 public final
36 class JpaManagedSessionStrategy
37 implements ISessionStrategy
38 {
39 //------------------------------------------------------------------------
40 // public
41 //------------------------------------------------------------------------
42 /**
43 * {@inheritDoc}
44 */
45 public void
46 shutdown()
47 {
48 throw new UnsupportedOperationException("Managed Session strategy " +
49 "must not be shutdown");
50 }
51
52 //------------------------------------------------------------------------
53 /**
54 * {@inheritDoc}
55 */
56 public ISession
57 getSession()
58 {
59 return theSessionAdapter.getTarget();
60 }
61
62 //------------------------------------------------------------------------
63 public void
64 setEntityManager(EntityManager anEntityManager)
65 {
66 if (theSessionAdapter == null || theSessionAdapter.
67 getAdaptee() != anEntityManager)
68 {
69 theSessionAdapter = new EntityManagerAdapter(anEntityManager);
70 }
71 }
72
73 //------------------------------------------------------------------------
74 // members
75 //------------------------------------------------------------------------
76 private IAdapter<ISession, EntityManager> theSessionAdapter;
77 }