01: /*
02: * JBoss, Home of Professional Open Source.
03: * Copyright 2006, Red Hat Middleware LLC, and individual contributors
04: * as indicated by the @author tags. See the copyright.txt file in the
05: * distribution for a full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * 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.tm.usertx.client;
23:
24: import org.jboss.tm.TransactionPropagationContextUtil;
25:
26: import java.util.Hashtable;
27:
28: import javax.naming.Context;
29: import javax.naming.InitialContext;
30: import javax.naming.Reference;
31: import javax.naming.Name;
32: import javax.naming.NamingException;
33: import javax.naming.spi.ObjectFactory;
34:
35: import javax.transaction.UserTransaction;
36:
37: /**
38: * This is an object factory for producing client
39: * UserTransactions.
40: * usage for standalone clients.
41: *
42: * @author <a href="mailto:osh@sparre.dk">Ole Husgaard</a>
43: * @version $Revision: 57209 $
44: */
45: public class ClientUserTransactionObjectFactory implements
46: ObjectFactory {
47: /**
48: * The <code>UserTransaction</code> this factory will return.
49: * This is evaluated lazily in {@link #getUserTransaction()}.
50: */
51: static private UserTransaction userTransaction = null;
52:
53: /**
54: * Get the <code>UserTransaction</code> this factory will return.
55: * This may return a cached value from a previous call.
56: */
57: static private UserTransaction getUserTransaction() {
58: if (userTransaction == null) {
59: // See if we have a local TM
60: try {
61: new InitialContext().lookup("java:/TransactionManager");
62:
63: // We execute in the server.
64: userTransaction = ServerVMClientUserTransaction
65: .getSingleton();
66: } catch (NamingException ex) {
67: // We execute in a stand-alone client.
68: ClientUserTransaction cut = ClientUserTransaction
69: .getSingleton();
70:
71: // Tell the proxy that this is the factory for
72: // transaction propagation contexts.
73: TransactionPropagationContextUtil.setTPCFactory(cut);
74: userTransaction = cut;
75: }
76: }
77: return userTransaction;
78: }
79:
80: public Object getObjectInstance(Object obj, Name name,
81: Context nameCtx, Hashtable environment) throws Exception {
82: Reference ref = (Reference) obj;
83:
84: if (!ref.getClassName().equals(
85: ClientUserTransaction.class.getName()))
86: return null;
87:
88: return getUserTransaction();
89: }
90: }
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