KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > objectweb > easybeans > transaction > interceptors > CMTNotSupportedTransactionInterceptor


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: CMTNotSupportedTransactionInterceptor.java 942 2006-07-26 09:17:13Z benoitf $
23  * --------------------------------------------------------------------------
24  */
25
26 package org.objectweb.easybeans.transaction.interceptors;
27
28 import javax.ejb.EJBException JavaDoc;
29 import javax.transaction.InvalidTransactionException JavaDoc;
30 import javax.transaction.SystemException JavaDoc;
31 import javax.transaction.Transaction JavaDoc;
32
33 import org.objectweb.easybeans.api.EasyBeansInvocationContext;
34 import org.objectweb.easybeans.log.JLog;
35 import org.objectweb.easybeans.log.JLogFactory;
36
37 /**
38  * Defines an interceptor for method using the NOT_SUPPORTED attribute.
39  * @author Florent Benoit
40  */
41 public class CMTNotSupportedTransactionInterceptor extends AbsTransactionInterceptor {
42
43     /**
44      * Logger.
45      */
46     private JLog logger = JLogFactory.getLog(CMTNotSupportedTransactionInterceptor.class);
47
48     /**
49      * Constructor.<br>
50      * Acquire the transaction manager.
51      */
52     public CMTNotSupportedTransactionInterceptor() {
53         super();
54     }
55
56     /**
57      * Execute transaction as specified with the NOT_SUPPORTED attribute.
58      * @param invocationContext context with useful attributes on the current
59      * invocation
60      * @return result of the next invocation (to chain interceptors)
61      * @throws Exception if interceptor fails
62      * @see <a HREF="http://www.jcp.org/en/jsr/detail?id=220">EJB 3.0
63      * specification ?12.6.2.1</a>
64      */
65     @Override JavaDoc
66     public Object JavaDoc intercept(final EasyBeansInvocationContext invocationContext) throws Exception JavaDoc {
67         logger.debug("Calling Not Supported TX interceptor");
68
69         // Get current transaction
70 Transaction JavaDoc transaction;
71         try {
72             transaction = getTransactionManager().getTransaction();
73         } catch (SystemException JavaDoc se) {
74             throw new EJBException JavaDoc("Cannot get the current transaction on transaction manager.", se);
75         }
76
77         logger.debug("Transaction found = {0}", transaction);
78
79         /*
80          * If a client calls with a transaction context, the container suspends
81          * the association of the transaction context with the current thread
82          * before invoking the enterprise bean?s business method.
83          */
84
85         Transaction JavaDoc suspendedTransaction = null;
86         if (transaction != null) {
87             try {
88                 logger.debug("Suspending transaction {0}", transaction);
89                 suspendedTransaction = getTransactionManager().suspend();
90             } catch (SystemException JavaDoc se) {
91                 throw new EJBException JavaDoc("Cannot call suspend() on the transaction manager.", se);
92             }
93         }
94
95         /*
96          * The suspended transaction context of the client is not passed to the
97          * resource managers or other enterprise bean objects that are invoked
98          * from the business method.
99          */
100         try {
101             return invocationContext.proceed();
102         } catch (Exception JavaDoc e) {
103             handleUnspecifiedTransactionContext(invocationContext, e);
104             // Shouldn't come here
105 return null;
106         } finally {
107
108             /*
109              * The container resumes the suspended association when the business
110              * method has completed.
111              */
112             if (suspendedTransaction != null) {
113
114                 logger.debug("Resuming transaction {0}", transaction);
115
116                 try {
117                     getTransactionManager().resume(suspendedTransaction);
118                 } catch (InvalidTransactionException JavaDoc ite) {
119                     throw new EJBException JavaDoc(
120                             "Cannot call resume() on the given transaction. There is an invalid transaction", ite);
121                 } catch (IllegalStateException JavaDoc ise) {
122                     throw new EJBException JavaDoc(
123                             "Cannot call resume() on the given transaction. There is another associated transaction",
124                             ise);
125                 } catch (SystemException JavaDoc se) {
126                     throw new EJBException JavaDoc("Cannot call resume() on the given transaction. Unexpected error condition",
127                             se);
128                 }
129             }
130         }
131     }
132
133 }
134
Popular Tags