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


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: CMTNeverTransactionInterceptor.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.SystemException JavaDoc;
30 import javax.transaction.Transaction JavaDoc;
31
32 import org.objectweb.easybeans.api.EasyBeansInvocationContext;
33 import org.objectweb.easybeans.log.JLog;
34 import org.objectweb.easybeans.log.JLogFactory;
35
36 /**
37  * Defines an interceptor for method using the NEVER attribute.
38  * @author Florent Benoit
39  */
40 public class CMTNeverTransactionInterceptor extends AbsTransactionInterceptor {
41
42     /**
43      * Logger.
44      */
45     private JLog logger = JLogFactory.getLog(CMTNeverTransactionInterceptor.class);
46
47     /**
48      * Constructor.<br>
49      * Acquire the transaction manager.
50      */
51     public CMTNeverTransactionInterceptor() {
52         super();
53     }
54
55     /**
56      * Execute transaction as specified with the NEVER attribute.
57      * @param invocationContext context with useful attributes on the current
58      * invocation
59      * @return result of the next invocation (to chain interceptors)
60      * @throws Exception if interceptor fails
61      * @see <a HREF="http://www.jcp.org/en/jsr/detail?id=220">EJB 3.0
62      * specification ?12.6.2.6</a>
63      */
64     @Override JavaDoc
65     public Object JavaDoc intercept(final EasyBeansInvocationContext invocationContext) throws Exception JavaDoc {
66         logger.debug("Calling Never TX interceptor");
67
68         // Get current transaction
69 Transaction JavaDoc transaction;
70         try {
71             transaction = getTransactionManager().getTransaction();
72         } catch (SystemException JavaDoc se) {
73             throw new EJBException JavaDoc("Cannot get the current transaction on transaction manager.", se);
74         }
75
76         logger.debug("Transaction found = {0}", transaction);
77
78         /*
79          * If the client calls with a transaction context, the container throws
80          * the javax.ejb.EJBException[ 55]. If the EJB 2.1 client view is used,
81          * the container throws the java.rmi.RemoteException exception if the
82          * client is a remote client, or the javax.ejb.EJBException if the
83          * client is a local client.
84          */
85         if (transaction != null) {
86             logger.warn("Mandatory as transaction attribute but within a transaction.");
87             throw new EJBException JavaDoc("Client should not call within a transaction context by using NEVER mode.");
88         }
89         // else
90 /*
91          * If the client calls without a transaction context, the container
92          * performs the same steps as described in the NOT_SUPPORTED case.
93          */
94         try {
95             return invocationContext.proceed();
96         } catch (Exception JavaDoc e) {
97             handleUnspecifiedTransactionContext(invocationContext, e);
98             // Shouldn't come here
99 return null;
100         }
101     }
102
103 }
104
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