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 write (dirty) block.
40: */
41: public class XAWriteBlock extends WriteBlock {
42: private static final Logger log = Log.open(XAWriteBlock.class);
43: private static final L10N L = new L10N(XAWriteBlock.class);
44:
45: private byte[] _buffer;
46:
47: public XAWriteBlock(Block block) throws IOException {
48: super (block);
49:
50: _buffer = _freeBuffers.allocate();
51: if (_buffer == null)
52: _buffer = new byte[Store.BLOCK_SIZE];
53:
54: block.read();
55:
56: System.arraycopy(block.getBuffer(), 0, getBuffer(), 0,
57: Store.BLOCK_SIZE);
58: }
59:
60: /**
61: * Returns the block's buffer.
62: */
63: public byte[] getBuffer() {
64: return _buffer;
65: }
66:
67: public void writeImpl(int offset, int length) throws IOException {
68: System.arraycopy(getBuffer(), offset, _block.getBuffer(),
69: offset, length);
70:
71: _block.setDirty(offset, offset + length);
72: // _block.write();
73: }
74:
75: /**
76: * Called when the block is removed from the cache.
77: */
78: protected void freeImpl() {
79: synchronized (this ) {
80: byte[] buffer = _buffer;
81: _buffer = null;
82:
83: if (buffer != null)
84: _freeBuffers.free(buffer);
85: }
86: }
87:
88: public String toString() {
89: return "XAWriteBlock[" + getStore() + "," + getBlockId()
90: / Store.BLOCK_SIZE + "]";
91: }
92: }
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