Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 306:971baa95fb07

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Experimental code to build file history, handy access to changeset added
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Sep 2011 04:05:41 +0200
parents 85b8efde5586
children f9f3e9b67ccc
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@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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19 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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20
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21 import java.io.ByteArrayOutputStream;
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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.Arrays;
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26 import org.tmatesoft.hg.core.HgBadStateException;
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.internal.DataAccess;
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29 import org.tmatesoft.hg.internal.DigestHelper;
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30 import org.tmatesoft.hg.internal.Experimental;
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31 import org.tmatesoft.hg.internal.Lifecycle;
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32 import org.tmatesoft.hg.internal.Pool2;
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33 import org.tmatesoft.hg.internal.RevlogStream;
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34 import org.tmatesoft.hg.util.Path;
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36
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37 /**
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38 *
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 public class HgManifest extends Revlog {
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43 private RevisionMapper revisionMap;
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44
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45 public enum Flags {
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46 Exec, Link;
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47
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48 static Flags parse(String flags) {
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49 if ("x".equalsIgnoreCase(flags)) {
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50 return Exec;
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51 }
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52 if ("l".equalsIgnoreCase(flags)) {
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53 return Link;
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54 }
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55 if (flags == null) {
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56 return null;
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57 }
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58 throw new IllegalStateException(flags);
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59 }
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60
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61 static Flags parse(byte[] data, int start, int length) {
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62 if (length == 0) {
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63 return null;
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64 }
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65 if (length == 1) {
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66 if (data[start] == 'x') {
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67 return Exec;
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68 }
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69 if (data[start] == 'l') {
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70 return Link;
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71 }
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72 // FALL THROUGH
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73 }
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74 throw new IllegalStateException(new String(data, start, length));
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75 }
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76
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77 String nativeString() {
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78 if (this == Exec) {
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79 return "x";
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80 }
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81 if (this == Link) {
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82 return "l";
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83 }
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84 throw new IllegalStateException(toString());
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85 }
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86 }
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88 /*package-local*/ HgManifest(HgRepository hgRepo, RevlogStream content) {
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89 super(hgRepo, content);
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90 }
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92 /**
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93 *
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94 * @param start changelog (not manifest!) revision to begin with
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95 * @param end changelog (not manifest!) revision to stop, inclusive.
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96 * @param inspector can't be <code>null</code>
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97 */
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98 public void walk(int start, int end, final Inspector inspector) {
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99 if (inspector == null) {
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100 throw new IllegalArgumentException();
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101 }
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102 int start0 = fromChangelog(start);
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103 int end0 = fromChangelog(end);
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104 if (end0 < start0) {
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105 // there are tool-constructed repositories that got order of changeset revisions completely different from that of manifest
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106 int x = end0;
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107 end0 = start0;
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108 start0 = x;
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109 }
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110 content.iterate(start0, end0, true, new ManifestParser(inspector));
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111 }
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112
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113 /**
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114 * "Sparse" iteration of the manifest
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115 *
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116 * @param inspector
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117 * @param localRevisions local changeset revisions to visit
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118 */
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119 public void walk(final Inspector inspector, int... localRevisions) {
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120 if (inspector == null || localRevisions == null) {
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121 throw new IllegalArgumentException();
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122 }
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123 int[] manifestLocalRevs = new int[localRevisions.length];
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124 boolean needsSort = false;
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125 for (int i = 0; i < localRevisions.length; i++) {
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126 final int manifestLocalRev = fromChangelog(localRevisions[i]);
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127 manifestLocalRevs[i] = manifestLocalRev;
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128 if (i > 0 && manifestLocalRevs[i-1] > manifestLocalRev) {
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129 needsSort = true;
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130 }
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131 }
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132 if (needsSort) {
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133 Arrays.sort(manifestLocalRevs);
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134 }
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135 content.iterate(manifestLocalRevs, true, new ManifestParser(inspector));
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136 }
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137
232
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138 // manifest revision number that corresponds to the given changeset
218
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139 /*package-local*/ int fromChangelog(int revisionNumber) {
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140 if (HgInternals.wrongLocalRevision(revisionNumber)) {
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141 throw new IllegalArgumentException(String.valueOf(revisionNumber));
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142 }
257
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143 if (revisionNumber == HgRepository.WORKING_COPY || revisionNumber == HgRepository.BAD_REVISION) {
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144 throw new IllegalArgumentException("Can't use constants like WORKING_COPY or BAD_REVISION");
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145 }
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146 // revisionNumber == TIP is processed by RevisionMapper
218
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147 if (revisionMap == null) {
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148 revisionMap = new RevisionMapper(getRepo());
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149 content.iterate(0, TIP, false, revisionMap);
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150 }
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151 return revisionMap.at(revisionNumber);
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152 }
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153
232
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154 /**
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155 * Extracts file revision as it was known at the time of given changeset.
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156 *
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157 * @param revisionNumber local changeset index
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158 * @param file path to file in question
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159 * @return file revision or <code>null</code> if manifest at specified revision doesn't list such file
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160 */
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161 @Experimental(reason="Perhaps, HgDataFile shall own this method")
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162 public Nodeid getFileRevision(int revisionNumber, final Path file) {
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163 int rev = fromChangelog(revisionNumber);
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164 final Nodeid[] rv = new Nodeid[] { null };
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165 content.iterate(rev, rev, true, new RevlogStream.Inspector() {
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166
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167 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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168 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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169 try {
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170 byte b;
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171 while (!data.isEmpty() && (b = data.readByte()) != '\n') {
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172 if (b != 0) {
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173 bos.write(b);
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174 } else {
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175 String fname = new String(bos.toByteArray());
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176 bos.reset();
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177 if (file.toString().equals(fname)) {
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178 byte[] nid = new byte[40];
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179 data.readBytes(nid, 0, 40);
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180 rv[0] = Nodeid.fromAscii(nid, 0, 40);
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181 break;
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182 }
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183 // else skip to the end of line
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184 while (!data.isEmpty() && (b = data.readByte()) != '\n')
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185 ;
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186 }
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187 }
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188 } catch (IOException ex) {
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189 throw new HgBadStateException(ex);
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190 }
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191 }
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192 });
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193 return rv[0];
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194 }
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195
19
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196 public interface Inspector {
222
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197 boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision);
285
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198 /**
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199 * @deprecated switch to {@link Inspector2#next(Nodeid, Path, Flags)}
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200 */
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201 @Deprecated
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202 boolean next(Nodeid nid, String fname, String flags);
222
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203 boolean end(int manifestRevision);
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204 }
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205
285
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206 @Experimental(reason="Explore Path alternative for filenames and enum for flags")
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207 public interface Inspector2 extends Inspector {
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208 boolean next(Nodeid nid, Path fname, Flags flags);
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209 }
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210
268
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211 /**
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212 * When Pool uses Strings directly,
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213 * ManifestParser creates new String instance with new char[] value, and does byte->char conversion.
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214 * For cpython repo, walk(0..10k), there are over 16 million filenames, of them only 3020 unique.
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215 * This means there are 15.9 million useless char[] instances and byte->char conversions
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216 *
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217 * When String (Path) is wrapped into {@link PathProxy}, there's extra overhead of byte[] representation
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218 * of the String, but these are only for unique Strings (Paths) (3020 in the example above). Besides, I save
268
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219 * useless char[] and byte->char conversions.
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220 */
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221 private static class PathProxy {
267
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222 private byte[] data;
268
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223 private int start;
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224 private final int hash, length;
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225 private Path result;
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226
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227 public PathProxy(byte[] data, int start, int length) {
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228 this.data = data;
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229 this.start = start;
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230 this.length = length;
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231
268
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232 // copy from String.hashCode(). In fact, not necessarily match result of String(data).hashCode
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233 // just need some nice algorithm here
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234 int h = 0;
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235 byte[] d = data;
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236 for (int i = 0, off = start, len = length; i < len; i++) {
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237 h = 31 * h + d[off++];
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238 }
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239 hash = h;
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240 }
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241
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242 @Override
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243 public boolean equals(Object obj) {
285
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244 if (false == obj instanceof PathProxy) {
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245 return false;
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246 }
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247 PathProxy o = (PathProxy) obj;
267
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248 if (o.result != null && result != null) {
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249 return result.equals(o.result);
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250 }
268
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251 if (o.length != length || o.hash != hash) {
267
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252 return false;
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253 }
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254 for (int i = 0, x = o.start, y = start; i < length; i++) {
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255 if (o.data[x++] != data[y++]) {
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256 return false;
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257 }
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258 }
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259 return true;
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260 }
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261 @Override
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262 public int hashCode() {
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263 return hash;
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264 }
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265
285
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266 public Path freeze() {
267
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267 if (result == null) {
285
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268 result = Path.create(new String(data, start, length));
268
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269 // release reference to bigger data array, make a copy of relevant part only
285
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270 // use original bytes, not those from String above to avoid cache misses due to different encodings
268
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271 byte[] d = new byte[length];
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272 System.arraycopy(data, start, d, 0, length);
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273 data = d;
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274 start = 0;
267
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275 }
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276 return result;
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277 }
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278 }
196
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279
268
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280 private static class ManifestParser implements RevlogStream.Inspector {
196
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281 private boolean gtg = true; // good to go
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282 private final Inspector inspector;
285
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283 private final Inspector2 inspector2;
304
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284 private Pool2<Nodeid> nodeidPool, thisRevPool;
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285 private final Pool2<PathProxy> fnamePool;
266
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286 private byte[] nodeidLookupBuffer = new byte[20]; // get reassigned each time new Nodeid is added to pool
262
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287
196
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288 public ManifestParser(Inspector delegate) {
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289 assert delegate != null;
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290 inspector = delegate;
285
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291 inspector2 = delegate instanceof Inspector2 ? (Inspector2) delegate : null;
304
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292 nodeidPool = new Pool2<Nodeid>();
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293 fnamePool = new Pool2<PathProxy>();
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294 thisRevPool = new Pool2<Nodeid>();
196
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295 }
268
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296
196
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297 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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298 if (!gtg) {
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299 return;
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300 }
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301 try {
222
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302 gtg = gtg && inspector.begin(revisionNumber, new Nodeid(nodeid, true), linkRevision);
285
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303 Path fname = null;
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304 Flags flags = null;
196
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305 Nodeid nid = null;
267
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306 int i;
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307 byte[] data = da.byteArray();
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308 for (i = 0; gtg && i < actualLen; i++) {
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309 int x = i;
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310 for( ; data[i] != '\n' && i < actualLen; i++) {
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311 if (fname == null && data[i] == 0) {
285
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312 PathProxy px = fnamePool.unify(new PathProxy(data, x, i - x));
268
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313 // if (cached = fnamePool.unify(px))== px then cacheMiss, else cacheHit
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314 // cpython 0..10k: hits: 15 989 152, misses: 3020
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315 fname = px.freeze();
267
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316 x = i+1;
196
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317 }
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318 }
267
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319 if (i < actualLen) {
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320 assert data[i] == '\n';
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321 int nodeidLen = i - x < 40 ? i-x : 40; // if > 40, there are flags
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322 DigestHelper.ascii2bin(data, x, nodeidLen, nodeidLookupBuffer); // ignore return value as it's unlikely to have NULL in manifest
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323 nid = new Nodeid(nodeidLookupBuffer, false); // this Nodeid is for pool lookup only, mock object
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324 Nodeid cached = nodeidPool.unify(nid);
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325 if (cached == nid) {
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326 // buffer now belongs to the cached nodeid
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327 nodeidLookupBuffer = new byte[20];
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328 } else {
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329 nid = cached; // use existing version, discard the lookup object
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330 } // for cpython 0..10k, cache hits are 15 973 301, vs 18871 misses.
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331 thisRevPool.record(nid); // memorize revision for the next iteration.
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332 if (nodeidLen + x < i) {
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333 // 'x' and 'l' for executable bits and symlinks?
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334 // hg --debug manifest shows 644 for each regular file in my repo
285
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335 // for cpython 0..10k, there are 4361062 flag checks, and there's only 1 unique flag
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336 flags = Flags.parse(data, x + nodeidLen, i-x-nodeidLen);
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337 } else {
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338 flags = null;
267
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339 }
285
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340 if (inspector2 == null) {
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341 String flagString = flags == null ? null : flags.nativeString();
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342 gtg = inspector.next(nid, fname.toString(), flagString);
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343 } else {
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344 gtg = inspector2.next(nid, fname, flags);
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345 }
267
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346 }
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347 nid = null;
285
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348 fname = null;
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349 flags = null;
196
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350 }
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351 gtg = gtg && inspector.end(revisionNumber);
262
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352 //
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353 // keep only actual file revisions, found at this version
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354 // (next manifest is likely to refer to most of them, although in specific cases
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355 // like commit in another branch a lot may be useless)
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356 nodeidPool.clear();
304
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357 Pool2<Nodeid> t = nodeidPool;
262
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358 nodeidPool = thisRevPool;
264
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359 thisRevPool = t;
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360 } catch (IOException ex) {
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361 throw new HgBadStateException(ex);
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362 }
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363 }
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364 }
218
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365
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366 private static class RevisionMapper implements RevlogStream.Inspector, Lifecycle {
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367
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368 private final int changelogRevisions;
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369 private int[] changelog2manifest;
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370 private final HgRepository repo;
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371
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372 public RevisionMapper(HgRepository hgRepo) {
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373 repo = hgRepo;
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374 changelogRevisions = repo.getChangelog().getRevisionCount();
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375 }
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376
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377 // respects TIP
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378 public int at(int revisionNumber) {
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379 if (revisionNumber == TIP) {
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380 revisionNumber = changelogRevisions - 1;
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381 }
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382 if (changelog2manifest != null) {
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383 return changelog2manifest[revisionNumber];
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384 }
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385 return revisionNumber;
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386 }
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387
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388 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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389 if (changelog2manifest != null) {
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390 // next assertion is not an error, rather assumption check, which is too development-related to be explicit exception -
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391 // I just wonder if there are manifests that have two entries pointing to single changeset. It seems unrealistic, though -
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392 // changeset records one and only one manifest nodeid
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393 assert changelog2manifest[linkRevision] == -1 : String.format("revision:%d, link:%d, already linked to revision:%d", revisionNumber, linkRevision, changelog2manifest[linkRevision]);
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394 changelog2manifest[linkRevision] = revisionNumber;
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395 } else {
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396 if (revisionNumber != linkRevision) {
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397 changelog2manifest = new int[changelogRevisions];
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398 Arrays.fill(changelog2manifest, -1);
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399 for (int i = 0; i < revisionNumber; changelog2manifest[i] = i, i++)
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400 ;
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401 changelog2manifest[linkRevision] = revisionNumber;
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402 }
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403 }
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404 }
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405
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406 public void start(int count, Callback callback, Object token) {
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407 if (count != changelogRevisions) {
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408 assert count < changelogRevisions; // no idea what to do if manifest has more revisions than changelog
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409 // the way how manifest may contain more revisions than changelog, as I can imagine, is a result of
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410 // some kind of an import tool (e.g. from SVN or CVS), that creates manifest and changelog independently.
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411 // Note, it's pure guess, I didn't see such repository yet (although the way manifest revisions
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412 // in cpython repo are numbered makes me think aforementioned way)
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413 changelog2manifest = new int[changelogRevisions];
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414 Arrays.fill(changelog2manifest, -1);
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415 }
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416 }
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417
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418 public void finish(Object token) {
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419 if (changelog2manifest == null) {
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420 return;
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421 }
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422 // I assume there'd be not too many revisions we don't know manifest of
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423 ArrayList<Integer> undefinedChangelogRevision = new ArrayList<Integer>();
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424 for (int i = 0; i < changelog2manifest.length; i++) {
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425 if (changelog2manifest[i] == -1) {
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426 undefinedChangelogRevision.add(i);
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427 }
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428 }
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429 for (int u : undefinedChangelogRevision) {
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430 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest();
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431 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup
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432 // right away in the #next (may refactor ParentWalker's sequential and sorted into dedicated helper and reuse here)
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433 changelog2manifest[u] = repo.getManifest().getLocalRevision(manifest);
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434 }
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435 }
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436 }
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437 }