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


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.Advised;
25 import org.jboss.aop.proxy.ClassProxy;
26 import org.jboss.aop.proxy.ClassProxyFactory;
27 import org.jboss.aop.util.PayloadKey;
28
29 /**
30  * This interceptor handles chooses an object to invoke
31  * on based on the transaction
32  *
33  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
34  * @version $Revision: 37406 $
35  */
36 public class Versioned
37 {
38    public static final String JavaDoc VERSIONED = "VERSIONED";
39    public static final String JavaDoc VERSIONED_OBJECT = "VERSIONED_OBJECT";
40    public static final String JavaDoc READONLY = "read-only";
41
42    public static Object JavaDoc makeVersioned(Object JavaDoc target)
43       throws Exception JavaDoc
44    {
45       if (target instanceof ClassProxy) throw new IllegalStateException JavaDoc("A ClassProxy is not allowed to be Versioned. You must have a concrete object");
46       ClassProxy proxy = ClassProxyFactory.newInstance(target.getClass());
47       VersionedObject versioned = new VersionedObject(target);
48       proxy._getInstanceAdvisor().getMetaData().addMetaData(VERSIONED, VERSIONED_OBJECT, versioned, PayloadKey.TRANSIENT);
49       proxy._getInstanceAdvisor().appendInterceptor(VersionedObjectInterceptorFactory.getInstance());
50       proxy._getInstanceAdvisor().appendInterceptor(new VersionedObjectForwardingInterceptor());
51       return proxy;
52    }
53
54    static DistributedVersionManager localManager = null;
55    public static synchronized DistributedVersionManager getLocalVersionManager() throws Exception JavaDoc
56    {
57       if (localManager == null)
58       {
59          LocalSynchronizationManager synchManager = new LocalSynchronizationManager(null);
60          localManager = new DistributedVersionManager(1000, synchManager);
61          synchManager.versionManager = localManager;
62          
63       }
64       return localManager;
65    }
66
67    public static void makePerFieldVersioned(Object JavaDoc target) throws Exception JavaDoc
68    {
69       if (!(target instanceof Advised)) throw new IllegalArgumentException JavaDoc("Cannot do per field versioning with a non-Advised object");
70       Advised advised = (Advised)target;
71       getLocalVersionManager().makeVersioned(advised);
72    }
73    
74 }
75
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