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Java > Open Source Codes > org > jboss > aspects > txlock > TxLockInterceptorFactory


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.txlock;
23
24 import org.jboss.aop.Advisor;
25 import org.jboss.aop.InstanceAdvisor;
26 import org.jboss.aop.joinpoint.Joinpoint;
27 import org.jboss.aop.metadata.SimpleMetaData;
28 import org.jboss.aop.util.PayloadKey;
29
30 import javax.naming.InitialContext JavaDoc;
31 import javax.naming.NamingException JavaDoc;
32 import javax.transaction.TransactionManager JavaDoc;
33
34 /**
35  *
36  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
37  * @version $Revision: 37406 $
38  */
39 public class TxLockInterceptorFactory implements org.jboss.aop.advice.AspectFactory
40 {
41
42    private static TransactionManager JavaDoc getTransactionManager()
43    {
44       try
45       {
46          InitialContext JavaDoc ctx = new InitialContext JavaDoc();
47          TransactionManager JavaDoc tm = (TransactionManager JavaDoc) ctx.lookup("java:/TransactionManager");
48          return tm;
49       }
50       catch (NamingException JavaDoc e)
51       {
52          throw new RuntimeException JavaDoc(e);
53       }
54    }
55
56    public Object JavaDoc createPerVM()
57    {
58       throw new RuntimeException JavaDoc("this interceptor only supports PER_CLASS and PER_INSTANCE");
59    }
60
61    public Object JavaDoc createPerClass(Advisor advisor)
62    {
63       QueuedTxLock lock = new QueuedTxLock();
64       advisor.getClassMetaData().addMetaData(QueuedTxLock.TXLOCK, QueuedTxLock.TXLOCK, lock, PayloadKey.TRANSIENT);
65       return new TxLockInterceptor(getTransactionManager(), lock);
66
67    }
68
69    public Object JavaDoc createPerInstance(Advisor advisor, InstanceAdvisor instanceAdvisor)
70    {
71       SimpleMetaData instanceData = instanceAdvisor.getMetaData();
72       QueuedTxLock lock = null;
73       synchronized(instanceData)
74       {
75          lock = (QueuedTxLock)instanceData.getMetaData(QueuedTxLock.TXLOCK, QueuedTxLock.TXLOCK);
76          if (lock == null)
77          {
78             lock = new QueuedTxLock();
79             instanceData.addMetaData(QueuedTxLock.TXLOCK, QueuedTxLock.TXLOCK, lock, PayloadKey.TRANSIENT);
80          }
81       }
82       return new TxLockInterceptor(getTransactionManager(), lock);
83    }
84
85    public Object JavaDoc createPerJoinpoint(Advisor advisor, Joinpoint jp)
86    {
87       throw new RuntimeException JavaDoc("this interceptor only supports PER_CLASS and PER_INSTANCE");
88    }
89
90    public Object JavaDoc createPerJoinpoint(Advisor advisor, InstanceAdvisor instanceAdvisor, Joinpoint jp)
91    {
92       throw new RuntimeException JavaDoc("this interceptor only supports PER_CLASS and PER_INSTANCE");
93    }
94
95    public String JavaDoc getName()
96    {
97       return getClass().getName();
98    }
99 }
100
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