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Java > Open Source Codes > com > hp > hpl > jena > graph > impl > TransactionHandlerBase


1 /*
2   (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
3   [See end of file]
4   $Id: TransactionHandlerBase.java,v 1.3 2005/02/21 11:52:11 andy_seaborne Exp $
5 */
6
7 package com.hp.hpl.jena.graph.impl;
8
9 import com.hp.hpl.jena.graph.*;
10 import com.hp.hpl.jena.shared.*;
11
12 /**
13     @author kers
14     
15     A base for transaction handlers - all it does is provide the canonical
16     implementation of executeInTransaction.
17 */
18 public abstract class TransactionHandlerBase implements TransactionHandler
19     {
20     public TransactionHandlerBase()
21         { super(); }
22
23     /**
24         Execute the command <code>c</code> within a transaction. If it
25         completes normally, commit the transaction and return the result.
26         Otherwise abort the transaction and throw a wrapped exception.
27     */
28     public Object JavaDoc executeInTransaction( Command c )
29         {
30         begin();
31         try { Object JavaDoc result = c.execute(); commit(); return result; }
32         catch (Exception JavaDoc e) { abort(); throw new JenaException( e ); }
33         }
34     }
35
36 /*
37     (c) Copyright 2002, 2003, 2004, 2005 Hewlett-Packard Development Company, LP
38     All rights reserved.
39
40     Redistribution and use in source and binary forms, with or without
41     modification, are permitted provided that the following conditions
42     are met:
43
44     1. Redistributions of source code must retain the above copyright
45        notice, this list of conditions and the following disclaimer.
46
47     2. Redistributions in binary form must reproduce the above copyright
48        notice, this list of conditions and the following disclaimer in the
49        documentation and/or other materials provided with the distribution.
50
51     3. The name of the author may not be used to endorse or promote products
52        derived from this software without specific prior written permission.
53
54     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
55     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
56     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
57     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
58     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
59     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
60     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
61     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
62     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
63     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
64 */
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