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Java > Open Source Codes > org > jboss > aspects > versioned > VersionedObjectInterceptorFactory


1 /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
11   *
12   * This software 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 GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */
22 package org.jboss.aspects.versioned;
23
24 import org.jboss.aop.Advisor;
25 import org.jboss.aop.InstanceAdvisor;
26 import org.jboss.aop.joinpoint.Joinpoint;
27 import org.jboss.util.NestedRuntimeException;
28
29 import javax.naming.InitialContext JavaDoc;
30 import javax.transaction.TransactionManager JavaDoc;
31
32 /**
33  *
34  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
35  * @version $Revision: 37406 $
36  */
37 public class VersionedObjectInterceptorFactory implements org.jboss.aop.advice.AspectFactory
38 {
39    private static VersionedObjectInterceptor instance = null;
40
41
42    public static synchronized VersionedObjectInterceptor getInstance()
43    {
44       try
45       {
46          if (instance == null)
47          {
48             InitialContext JavaDoc ctx = new InitialContext JavaDoc();
49             TransactionManager JavaDoc tm = (TransactionManager JavaDoc)ctx.lookup("java:/TransactionManager");
50             instance = new VersionedObjectInterceptor(tm);
51          }
52          return instance;
53       }
54       catch (Exception JavaDoc ex)
55       {
56          throw new NestedRuntimeException(ex);
57       }
58    }
59
60    public Object JavaDoc createPerVM()
61    {
62       return getInstance();
63    }
64
65    public Object JavaDoc createPerClass(Advisor advisor)
66    {
67       return getInstance();
68    }
69
70    public Object JavaDoc createPerInstance(Advisor advisor, InstanceAdvisor instanceAdvisor)
71    {
72       return getInstance();
73    }
74
75    public Object JavaDoc createPerJoinpoint(Advisor advisor, Joinpoint jp)
76    {
77       return getInstance();
78    }
79
80    public Object JavaDoc createPerJoinpoint(Advisor advisor, InstanceAdvisor instanceAdvisor, Joinpoint jp)
81    {
82       return getInstance();
83    }
84
85    public String JavaDoc getName()
86    {
87       return getClass().getName();
88    }
89
90 }
91
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