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Java > Open Source Codes > com > caucho > db > store > RawTransaction


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  *
23  * Free Software Foundation, Inc.
24  * 59 Temple Place, Suite 330
25  * Boston, MA 02111-1307 USA
26  *
27  * @author Scott Ferguson
28  */
29
30 package com.caucho.db.store;
31
32 import java.io.IOException JavaDoc;
33
34 /**
35  * Represents a raw-single transaction.
36  */
37 public class RawTransaction extends StoreTransaction {
38   private static final RawTransaction XA = new RawTransaction();
39
40   private RawTransaction()
41   {
42   }
43
44   public static RawTransaction create()
45   {
46     return XA;
47   }
48
49   /**
50    * Returns a read block.
51    */
52   public Block readBlock(Store store, long blockAddress)
53     throws IOException JavaDoc
54   {
55     return store.readBlock(blockAddress);
56   }
57
58   /**
59    * Returns a modified block.
60    */
61   public Block createWriteBlock(Block block)
62     throws IOException JavaDoc
63   {
64     return block;
65   }
66
67   /**
68    * Adds an update block
69    */
70   public void addUpdateBlock(Block block)
71     throws IOException JavaDoc
72   {
73   }
74
75   /**
76    * Returns a modified block.
77    */
78   public Block createAutoCommitWriteBlock(Block block)
79     throws IOException JavaDoc
80   {
81     return block;
82   }
83 }
84
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