EntityManagerAccess00Interceptor


1   /**
2    * EasyBeans
3    * Copyright (C) 2006 Bull S.A.S.
4    * Contact: easybeans@objectweb.org
5    *
6    * This library is free software; you can redistribute it and/or
7    * modify it under the terms of the GNU Lesser General Public
8    * License as published by the Free Software Foundation; either
9    * version 2.1 of the License, or any later version.
10   *
11   * This library is distributed in the hope that it will be useful,
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   * Lesser General Public License for more details.
15   *
16   * You should have received a copy of the GNU Lesser General Public
17   * License along with this library; if not, write to the Free Software
18   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
19   * USA
20   *
21   * --------------------------------------------------------------------------
22   * $Id: EntityManagerAccess00Interceptor.java 821 2006-07-04 13:28:52Z studzine $
23   * --------------------------------------------------------------------------
24   */
25  package org.objectweb.easybeans.tests.common.interceptors.business.access;
26  
27  import javax.annotation.Resource;
28  import javax.ejb.SessionContext  ;
29  import javax.interceptor.AroundInvoke;
30  import javax.interceptor.InvocationContext;
31  import javax.transaction.UserTransaction  ;
32  
33  import org.objectweb.easybeans.tests.common.resources.EntityManagerTester;
34  
35  /**
36   * Interceptor used to access an EntityManager.
37   * @author Eduardo Studzinski Estima de Castro
38   * @author Gisele Pinheiro Souza
39   */
40  public class EntityManagerAccess00Interceptor extends EntityManagerTester {
41  
42      /**
43       * Session Context.
44       */
45      @Resource
46      private SessionContext   ctx;
47  
48      /**
49       * Intercepts the method and tries to access an entity bean using the entity
50       * manager.
51       * @param ic contains attributes of invocation
52       * @return method's invocation result
53       * @throws Exception if invocation fails
54       */
55      @AroundInvoke
56      protected Object   intercept(final InvocationContext ic) throws Exception   {
57          this.access();
58          return ic.proceed();
59      }
60  
61      /**
62       * Verifies the EntityManager reference.
63       * @throws Exception if a problem occurs.
64       */
65      private void access() throws Exception   {
66          UserTransaction   utx;
67  
68          try {
69              utx = ctx.getUserTransaction();
70              utx.begin();
71          } catch (Exception   e) {
72              utx = null;
73          }
74  
75          super.access00();
76  
77          if (utx != null) {
78              utx.commit();
79          }
80      }
81  }
82
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