01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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;
36: import java.util.logging.Logger;
37:
38: /**
39: * Represents a single transaction.
40: */
41: abstract public class StoreTransaction {
42: private static final Logger log = Log.open(StoreTransaction.class);
43: private static final L10N L = new L10N(StoreTransaction.class);
44:
45: /**
46: * Returns a read block.
47: */
48: abstract public Block readBlock(Store store, long blockAddress)
49: throws IOException;
50:
51: /**
52: * Returns a modified block.
53: */
54: abstract public Block createWriteBlock(Block block)
55: throws IOException;
56:
57: /**
58: * Adds an updated block.
59: */
60: abstract public void addUpdateBlock(Block block) throws IOException;
61:
62: /**
63: * Add an update fragment block.
64: */
65: public void addUpdateFragmentBlock(Block block) throws IOException {
66: addUpdateBlock(block);
67: }
68:
69: /**
70: * Returns a modified block.
71: */
72: public Block createAutoCommitWriteBlock(Block block)
73: throws IOException {
74: return block;
75: }
76: }
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