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


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 com.caucho.log.Log;
33 import com.caucho.util.L10N;
34
35 import java.io.IOException JavaDoc;
36 import java.util.logging.Logger JavaDoc;
37 /**
38  * Represents a single transaction.
39  */
40 abstract public class StoreTransaction {
41   private static final Logger JavaDoc log = Log.open(StoreTransaction.class);
42   private static final L10N L = new L10N(StoreTransaction.class);
43
44   /**
45    * Returns a read block.
46    */
47   abstract public Block readBlock(Store store, long blockAddress)
48     throws IOException JavaDoc;
49
50   /**
51    * Returns a modified block.
52    */
53   abstract public Block createWriteBlock(Block block)
54     throws IOException JavaDoc;
55
56   /**
57    * Adds an updated block.
58    */
59   abstract public void addUpdateBlock(Block block)
60     throws IOException JavaDoc;
61
62   /**
63    * Add an update fragment block.
64    */
65   public void addUpdateFragmentBlock(Block block)
66     throws IOException JavaDoc
67   {
68     addUpdateBlock(block);
69   }
70
71   /**
72    * Returns a modified block.
73    */
74   public Block createAutoCommitWriteBlock(Block block)
75     throws IOException JavaDoc
76   {
77     return block;
78   }
79 }
80
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