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Java > Open Source Codes > com > hp > hpl > jena > graph > TransactionHandler


1 /*
2   (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
3   [See end of file]
4   $Id: TransactionHandler.java,v 1.4 2005/02/21 11:51:56 andy_seaborne Exp $
5 */
6
7 package com.hp.hpl.jena.graph;
8
9 import com.hp.hpl.jena.shared.*;
10
11 /**
12     Preliminary interface for graphs supporting transactions.
13     
14     @author kers
15 */
16 public interface TransactionHandler
17     {
18     /**
19         Does this handler support transactions at all?
20         
21         @return true iff begin/abort/commit are implemented and make sense.
22     */
23     boolean transactionsSupported();
24     
25     /**
26         If transactions are supported, begin a new transaction. If tranactions are
27         not supported, or they are but this tranaction is nested and nested transactions
28         are not supported, throw an UnsupportedOperationException.
29     */
30     void begin();
31     
32     /**
33         If transactions are supported and there is a tranaction in progress, abort
34         it. If transactions are not supported, or there is no transaction in progress,
35         throw an UnsupportedOperationException.
36     */
37     void abort();
38     
39     /**
40         If transactions are supported and there is a tranaction in progress, commit
41         it. If transactions are not supported, , or there is no transaction in progress,
42         throw an UnsupportedOperationException.
43    */
44     void commit();
45     
46     /**
47         If transactions are supported, execute the command c within a transaction
48         and return its result. If not, throw an UnsupportedOperationException.
49     */
50     Object JavaDoc executeInTransaction( Command c );
51     }
52
53
54 /*
55     (c) Copyright 2002, 2003, 2004, 2005 Hewlett-Packard Development Company, LP
56     All rights reserved.
57
58     Redistribution and use in source and binary forms, with or without
59     modification, are permitted provided that the following conditions
60     are met:
61
62     1. Redistributions of source code must retain the above copyright
63        notice, this list of conditions and the following disclaimer.
64
65     2. Redistributions in binary form must reproduce the above copyright
66        notice, this list of conditions and the following disclaimer in the
67        documentation and/or other materials provided with the distribution.
68
69     3. The name of the author may not be used to endorse or promote products
70        derived from this software without specific prior written permission.
71
72     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
73     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
74     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
75     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
76     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
77     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
78     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
79     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
80     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
81     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
82 */
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