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annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 77:c677e1593919

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Moved RevlogStream implementation into .internal
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 24 Jan 2011 05:33:47 +0100
parents src/org/tmatesoft/hg/repo/RevlogStream.java@6f1b88693d48
children 4222b04f34ee
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@svnkit.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21 import java.io.File;
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22 import java.io.IOException;
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23 import java.util.ArrayList;
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24 import java.util.Collections;
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25 import java.util.LinkedList;
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26 import java.util.List;
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27 import java.util.zip.DataFormatException;
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28 import java.util.zip.Inflater;
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30 import org.tmatesoft.hg.core.Nodeid;
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33 /**
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34 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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35 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
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36 *
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37 * @see http://mercurial.selenic.com/wiki/Revlog
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38 * @see http://mercurial.selenic.com/wiki/RevlogNG
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39 *
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public class RevlogStream {
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44
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45 private List<IndexEntry> index; // indexed access highly needed
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46 private boolean inline = false;
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47 private final File indexFile;
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48 private final DataAccessProvider dataAccess;
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50 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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51 public RevlogStream(DataAccessProvider dap, File indexFile) {
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52 this.dataAccess = dap;
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53 this.indexFile = indexFile;
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54 }
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56 /*package*/ DataAccess getIndexStream() {
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57 return dataAccess.create(indexFile);
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58 }
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60 /*package*/ DataAccess getDataStream() {
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61 final String indexName = indexFile.getName();
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62 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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63 return dataAccess.create(dataFile);
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64 }
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66 public int revisionCount() {
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67 initOutline();
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68 return index.size();
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69 }
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71 public int dataLength(int revision) {
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72 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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73 //
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74 final int indexSize = revisionCount();
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75 DataAccess daIndex = getIndexStream(); // XXX may supply a hint that I'll need really few bytes of data (although at some offset)
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76 if (revision == TIP) {
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77 revision = indexSize - 1;
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78 }
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79 try {
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80 int recordOffset = inline ? (int) index.get(revision).offset : revision * REVLOGV1_RECORD_SIZE;
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81 daIndex.seek(recordOffset + 12); // 6+2+4
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82 int actualLen = daIndex.readInt();
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83 return actualLen;
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84 } catch (IOException ex) {
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85 ex.printStackTrace(); // log error. FIXME better handling
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86 throw new IllegalStateException(ex);
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87 } finally {
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88 daIndex.done();
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89 }
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90 }
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91
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92 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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93 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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94 // map of nodeids, and once this comes true, we may get rid of this method.
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95 // Unlike its counterpart, Revlog#getLocalRevisionNumber, doesn't fail with exception if node not found,
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96 // returns a predefined constant instead
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97 public int findLocalRevisionNumber(Nodeid nodeid) {
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98 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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99 final int indexSize = revisionCount();
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100 DataAccess daIndex = getIndexStream();
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101 try {
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102 byte[] nodeidBuf = new byte[20];
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103 for (int i = 0; i < indexSize; i++) {
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104 daIndex.skip(8);
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105 int compressedLen = daIndex.readInt();
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106 daIndex.skip(20);
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107 daIndex.readBytes(nodeidBuf, 0, 20);
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108 if (nodeid.equalsTo(nodeidBuf)) {
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109 return i;
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110 }
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111 daIndex.skip(inline ? 12 + compressedLen : 12);
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112 }
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113 } catch (IOException ex) {
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114 ex.printStackTrace(); // log error. FIXME better handling
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115 throw new IllegalStateException(ex);
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116 } finally {
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117 daIndex.done();
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118 }
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119 return Integer.MIN_VALUE;
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120 }
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121
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123 private final int REVLOGV1_RECORD_SIZE = 64;
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124
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125 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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126 // ? boolean needsNodeid
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c677e1593919 Moved RevlogStream implementation into .internal
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diff changeset
127 public void iterate(int start, int end, boolean needData, Inspector inspector) {
2
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128 initOutline();
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129 final int indexSize = index.size();
3
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130 if (indexSize == 0) {
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diff changeset
131 return;
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132 }
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fc265ddeab26 File content and non-effective, although working, patch application
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133 if (end == TIP) {
3
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diff changeset
134 end = indexSize - 1;
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135 }
5
fc265ddeab26 File content and non-effective, although working, patch application
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diff changeset
136 if (start == TIP) {
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diff changeset
137 start = indexSize - 1;
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diff changeset
138 }
2
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diff changeset
139 if (start < 0 || start >= indexSize) {
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diff changeset
140 throw new IllegalArgumentException("Bad left range boundary " + start);
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141 }
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diff changeset
142 if (end < start || end >= indexSize) {
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diff changeset
143 throw new IllegalArgumentException("Bad right range boundary " + end);
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144 }
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145 // XXX may cache [start .. end] from index with a single read (pre-read)
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parents: 0
diff changeset
146
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147 DataAccess daIndex = null, daData = null;
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148 daIndex = getIndexStream();
3
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diff changeset
149 if (needData && !inline) {
9
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150 daData = getDataStream();
2
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151 }
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152 try {
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
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153 byte[] nodeidBuf = new byte[20];
3
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154 byte[] lastData = null;
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155 int i;
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156 boolean extraReadsToBaseRev = false;
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157 if (needData && index.get(start).baseRevision < start) {
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diff changeset
158 i = index.get(start).baseRevision;
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159 extraReadsToBaseRev = true;
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parents: 4
diff changeset
160 } else {
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diff changeset
161 i = start;
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parents: 4
diff changeset
162 }
9
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diff changeset
163
22
603806cd2dc6 Status of local working dir against non-tip base revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 10
diff changeset
164 daIndex.seek(inline ? (int) index.get(i).offset : i * REVLOGV1_RECORD_SIZE);
5
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
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165 for (; i <= end; i++ ) {
9
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parents: 6
diff changeset
166 long l = daIndex.readLong();
49
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
167 @SuppressWarnings("unused")
2
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diff changeset
168 long offset = l >>> 16;
49
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
169 @SuppressWarnings("unused")
2
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parents: 0
diff changeset
170 int flags = (int) (l & 0X0FFFF);
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parents: 6
diff changeset
171 int compressedLen = daIndex.readInt();
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parents: 6
diff changeset
172 int actualLen = daIndex.readInt();
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parents: 6
diff changeset
173 int baseRevision = daIndex.readInt();
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parents: 6
diff changeset
174 int linkRevision = daIndex.readInt();
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parents: 6
diff changeset
175 int parent1Revision = daIndex.readInt();
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parents: 6
diff changeset
176 int parent2Revision = daIndex.readInt();
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
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diff changeset
177 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
d4fdd1845b3f Nodeid with array of exactly 20 bytes
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diff changeset
178 daIndex.readBytes(nodeidBuf, 0, 20);
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diff changeset
179 daIndex.skip(12);
2
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180 byte[] data = null;
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diff changeset
181 if (needData) {
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diff changeset
182 byte[] dataBuf = new byte[compressedLen];
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diff changeset
183 if (inline) {
9
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diff changeset
184 daIndex.readBytes(dataBuf, 0, compressedLen);
2
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diff changeset
185 } else {
9
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diff changeset
186 daData.seek(index.get(i).offset);
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187 daData.readBytes(dataBuf, 0, compressedLen);
2
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188 }
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diff changeset
189 if (dataBuf[0] == 0x78 /* 'x' */) {
3
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diff changeset
190 try {
33
565ce0835674 TODO added, to try stream for unzip in revlog
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diff changeset
191 Inflater zlib = new Inflater(); // XXX Consider reuse of Inflater, and/or stream alternative
3
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diff changeset
192 zlib.setInput(dataBuf, 0, compressedLen);
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193 byte[] result = new byte[actualLen*2]; // FIXME need to use zlib.finished() instead
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diff changeset
194 int resultLen = zlib.inflate(result);
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diff changeset
195 zlib.end();
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diff changeset
196 data = new byte[resultLen];
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diff changeset
197 System.arraycopy(result, 0, data, 0, resultLen);
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diff changeset
198 } catch (DataFormatException ex) {
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diff changeset
199 ex.printStackTrace();
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diff changeset
200 data = new byte[0]; // FIXME need better failure strategy
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diff changeset
201 }
2
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diff changeset
202 } else if (dataBuf[0] == 0x75 /* 'u' */) {
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diff changeset
203 data = new byte[dataBuf.length - 1];
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diff changeset
204 System.arraycopy(dataBuf, 1, data, 0, data.length);
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parents: 0
diff changeset
205 } else {
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parents: 0
diff changeset
206 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
3
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diff changeset
207 // but I don't see reason not to return data as is
2
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diff changeset
208 data = dataBuf;
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diff changeset
209 }
3
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diff changeset
210 // XXX
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diff changeset
211 if (baseRevision != i) { // XXX not sure if this is the right way to detect a patch
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diff changeset
212 // this is a patch
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diff changeset
213 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
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diff changeset
214 int patchElementIndex = 0;
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diff changeset
215 do {
36
205f9b59b400 Strip parsing logic out from console frontend
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parents: 35
diff changeset
216 PatchRecord pr = PatchRecord.read(data, patchElementIndex);
205f9b59b400 Strip parsing logic out from console frontend
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parents: 35
diff changeset
217 patches.add(pr);
205f9b59b400 Strip parsing logic out from console frontend
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parents: 35
diff changeset
218 patchElementIndex += 12 + pr.len;
3
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diff changeset
219 } while (patchElementIndex < data.length);
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parents: 2
diff changeset
220 //
5
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
221 byte[] baseRevContent = lastData;
6
5abe5af181bd Ant script to build commands and run sample
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 5
diff changeset
222 data = apply(baseRevContent, actualLen, patches);
3
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diff changeset
223 }
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diff changeset
224 } else {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
diff changeset
225 if (inline) {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
diff changeset
226 daIndex.skip(compressedLen);
3
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diff changeset
227 }
2
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
228 }
5
fc265ddeab26 File content and non-effective, although working, patch application
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 4
diff changeset
229 if (!extraReadsToBaseRev || i >= start) {
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
230 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, data);
5
fc265ddeab26 File content and non-effective, although working, patch application
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parents: 4
diff changeset
231 }
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
232 lastData = data;
2
08db726a0fb7 Shaping out low-level Hg structures
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diff changeset
233 }
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parents: 0
diff changeset
234 } catch (IOException ex) {
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
235 throw new IllegalStateException(ex); // FIXME need better handling
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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diff changeset
236 } finally {
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
237 daIndex.done();
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
238 if (daData != null) {
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parents: 6
diff changeset
239 daData.done();
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diff changeset
240 }
2
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parents: 0
diff changeset
241 }
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
242 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
243
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
244 private void initOutline() {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 0
diff changeset
245 if (index != null && !index.isEmpty()) {
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parents: 0
diff changeset
246 return;
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
247 }
08db726a0fb7 Shaping out low-level Hg structures
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parents: 0
diff changeset
248 ArrayList<IndexEntry> res = new ArrayList<IndexEntry>();
9
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
diff changeset
249 DataAccess da = getIndexStream();
2
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
250 try {
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251 int versionField = da.readInt();
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252 da.readInt(); // just to skip next 2 bytes of offset + flags
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253 final int INLINEDATA = 1 << 16;
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254 inline = (versionField & INLINEDATA) != 0;
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255 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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256 while(true) {
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257 int compressedLen = da.readInt();
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258 // 8+4 = 12 bytes total read here
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259 @SuppressWarnings("unused")
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260 int actualLen = da.readInt();
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261 int baseRevision = da.readInt();
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262 // 12 + 8 = 20 bytes read here
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263 // int linkRevision = di.readInt();
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264 // int parent1Revision = di.readInt();
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265 // int parent2Revision = di.readInt();
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266 // byte[] nodeid = new byte[32];
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267 if (inline) {
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268 res.add(new IndexEntry(offset + REVLOGV1_RECORD_SIZE * res.size(), baseRevision));
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269 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
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270 } else {
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271 res.add(new IndexEntry(offset, baseRevision));
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272 da.skip(3*4 + 32);
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273 }
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274 if (da.isEmpty()) {
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275 // fine, done then
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276 res.trimToSize();
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277 index = res;
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278 break;
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279 } else {
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280 // start reading next record
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281 long l = da.readLong();
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282 offset = l >>> 16;
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283 }
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284 }
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285 } catch (IOException ex) {
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286 ex.printStackTrace(); // log error
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287 // too bad, no outline then.
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288 index = Collections.emptyList();
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289 } finally {
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290 da.done();
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291 }
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292
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293 }
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294
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295
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296 // perhaps, package-local or protected, if anyone else from low-level needs them
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297 // XXX think over if we should keep offset in case of separate data file - we read the field anyway. Perhaps, distinct entry classes for Inline and non-inline indexes?
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298 private static class IndexEntry {
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299 public final long offset; // for separate .i and .d - copy of index record entry, for inline index - actual offset of the record in the .i file (record entry + revision * record size))
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300 //public final int length; // data past fixed record (need to decide whether including header size or not), and whether length is of compressed data or not
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301 public final int baseRevision;
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302
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303 public IndexEntry(long o, int baseRev) {
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304 offset = o;
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305 baseRevision = baseRev;
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306 }
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307 }
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308
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309 // mpatch.c : apply()
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310 // FIXME need to implement patch merge (fold, combine, gather and discard from aforementioned mpatch.[c|py]), also see Revlog and Mercurial PDF
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311 public/*for HgBundle; until moved to better place*/static byte[] apply(byte[] baseRevisionContent, int outcomeLen, List<PatchRecord> patch) {
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312 int last = 0, destIndex = 0;
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313 if (outcomeLen == -1) {
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314 outcomeLen = baseRevisionContent.length;
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315 for (PatchRecord pr : patch) {
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316 outcomeLen += pr.start - last + pr.len;
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317 last = pr.end;
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318 }
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319 outcomeLen -= last;
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320 last = 0;
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321 }
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322 byte[] rv = new byte[outcomeLen];
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323 for (PatchRecord pr : patch) {
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324 System.arraycopy(baseRevisionContent, last, rv, destIndex, pr.start-last);
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325 destIndex += pr.start - last;
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326 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
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327 destIndex += pr.data.length;
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328 last = pr.end;
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329 }
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330 System.arraycopy(baseRevisionContent, last, rv, destIndex, baseRevisionContent.length - last);
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331 return rv;
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332 }
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333
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334 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
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335 public static class PatchRecord {
52
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336 /*
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337 Given there are pr1 and pr2:
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338 pr1.start to pr1.end will be replaced with pr's data (of pr1.len)
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339 pr1.end to pr2.start gets copied from base
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340 */
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341 public int start, end, len;
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342 public byte[] data;
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343
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344 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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345 private PatchRecord(int p1, int p2, int length, byte[] src) {
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346 start = p1;
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347 end = p2;
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348 len = length;
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349 data = src;
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350 }
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351
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352 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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353 final int x = offset; // shorthand
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354 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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355 int p2 = ((data[x+4] & 0xFF) << 24) | ((data[x+5] & 0xFF) << 16) | ((data[x+6] & 0xFF) << 8) | (data[x+7] & 0xFF);
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356 int len = ((data[x+8] & 0xFF) << 24) | ((data[x+9] & 0xFF) << 16) | ((data[x+10] & 0xFF) << 8) | (data[x+11] & 0xFF);
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357 byte[] dataCopy = new byte[len];
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358 System.arraycopy(data, x+12, dataCopy, 0, len);
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359 return new PatchRecord(p1, p2, len, dataCopy);
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360 }
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361
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362 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
36
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363 int p1 = da.readInt();
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364 int p2 = da.readInt();
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365 int len = da.readInt();
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366 byte[] src = new byte[len];
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367 da.readBytes(src, 0, len);
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368 return new PatchRecord(p1, p2, len, src);
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369 }
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370 }
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371
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372 // FIXME byte[] data might be too expensive, for few usecases it may be better to have intermediate Access object (when we don't need full data
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
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373 // instantly - e.g. calculate hash, or comparing two revisions
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
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374 public interface Inspector {
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
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375 // XXX boolean retVal to indicate whether to continue?
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
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376 // TODO specify nodeid and data length, and reuse policy (i.e. if revlog stream doesn't reuse nodeid[] for each call)
c677e1593919 Moved RevlogStream implementation into .internal
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
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377 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, byte[] data);
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24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
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378 }
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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379 }