Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 289:086a326f181f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Provide public access to ignored files configuration to use in alternative file walkers
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 12 Sep 2011 14:11:45 +0200
parents 6dbbc53fc46d
children 650b45d290b1
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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18
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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.Pool;
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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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91
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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 content.iterate(start0, end0, true, new ManifestParser(inspector));
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105 }
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106
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107 /**
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108 * "Sparse" iteration of the manifest
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109 *
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110 * @param inspector
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111 * @param localRevisions local changeset revisions to visit
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112 */
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113 public void walk(final Inspector inspector, int... localRevisions) {
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114 if (inspector == null || localRevisions == null) {
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115 throw new IllegalArgumentException();
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116 }
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117 int[] manifestLocalRevs = new int[localRevisions.length];
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118 boolean needsSort = false;
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119 for (int i = 0; i < localRevisions.length; i++) {
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120 final int manifestLocalRev = fromChangelog(localRevisions[i]);
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121 manifestLocalRevs[i] = manifestLocalRev;
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122 if (i > 0 && manifestLocalRevs[i-1] > manifestLocalRev) {
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123 needsSort = true;
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124 }
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125 }
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126 if (needsSort) {
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127 Arrays.sort(manifestLocalRevs);
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128 }
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129 content.iterate(manifestLocalRevs, true, new ManifestParser(inspector));
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130 }
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131
232
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132 // manifest revision number that corresponds to the given changeset
218
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133 /*package-local*/ int fromChangelog(int revisionNumber) {
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134 if (HgInternals.wrongLocalRevision(revisionNumber)) {
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135 throw new IllegalArgumentException(String.valueOf(revisionNumber));
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136 }
257
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137 if (revisionNumber == HgRepository.WORKING_COPY || revisionNumber == HgRepository.BAD_REVISION) {
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138 throw new IllegalArgumentException("Can't use constants like WORKING_COPY or BAD_REVISION");
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139 }
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140 // revisionNumber == TIP is processed by RevisionMapper
218
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141 if (revisionMap == null) {
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142 revisionMap = new RevisionMapper(getRepo());
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143 content.iterate(0, TIP, false, revisionMap);
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144 }
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145 return revisionMap.at(revisionNumber);
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146 }
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147
232
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148 /**
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149 * Extracts file revision as it was known at the time of given changeset.
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150 *
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151 * @param revisionNumber local changeset index
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152 * @param file path to file in question
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153 * @return file revision or <code>null</code> if manifest at specified revision doesn't list such file
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154 */
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155 @Experimental(reason="Perhaps, HgDataFile shall own this method")
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156 public Nodeid getFileRevision(int revisionNumber, final Path file) {
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157 int rev = fromChangelog(revisionNumber);
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158 final Nodeid[] rv = new Nodeid[] { null };
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159 content.iterate(rev, rev, true, new RevlogStream.Inspector() {
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160
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161 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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162 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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163 try {
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164 byte b;
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165 while (!data.isEmpty() && (b = data.readByte()) != '\n') {
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166 if (b != 0) {
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167 bos.write(b);
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168 } else {
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169 String fname = new String(bos.toByteArray());
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170 bos.reset();
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171 if (file.toString().equals(fname)) {
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172 byte[] nid = new byte[40];
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173 data.readBytes(nid, 0, 40);
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174 rv[0] = Nodeid.fromAscii(nid, 0, 40);
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175 break;
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176 }
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177 // else skip to the end of line
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178 while (!data.isEmpty() && (b = data.readByte()) != '\n')
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179 ;
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180 }
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181 }
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182 } catch (IOException ex) {
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183 throw new HgBadStateException(ex);
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184 }
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185 }
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186 });
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187 return rv[0];
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188 }
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189
19
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190 public interface Inspector {
222
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191 boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision);
285
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192 /**
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193 * @deprecated switch to {@link Inspector2#next(Nodeid, Path, Flags)}
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194 */
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195 @Deprecated
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196 boolean next(Nodeid nid, String fname, String flags);
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197 boolean end(int manifestRevision);
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198 }
267
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199
285
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200 @Experimental(reason="Explore Path alternative for filenames and enum for flags")
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201 public interface Inspector2 extends Inspector {
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202 boolean next(Nodeid nid, Path fname, Flags flags);
267
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203 }
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204
268
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205 /**
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206 * When Pool uses Strings directly,
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207 * ManifestParser creates new String instance with new char[] value, and does byte->char conversion.
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208 * For cpython repo, walk(0..10k), there are over 16 million filenames, of them only 3020 unique.
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209 * This means there are 15.9 million useless char[] instances and byte->char conversions
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210 *
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211 * When String (Path) is wrapped into {@link PathProxy}, there's extra overhead of byte[] representation
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212 * of the String, but these are only for unique Strings (Paths) (3020 in the example above). Besides, I save
268
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213 * useless char[] and byte->char conversions.
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214 */
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215 private static class PathProxy {
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216 private byte[] data;
268
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217 private int start;
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218 private final int hash, length;
285
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219 private Path result;
267
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220
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221 public PathProxy(byte[] data, int start, int length) {
267
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222 this.data = data;
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223 this.start = start;
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224 this.length = length;
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225
268
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226 // copy from String.hashCode(). In fact, not necessarily match result of String(data).hashCode
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227 // just need some nice algorithm here
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228 int h = 0;
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229 byte[] d = data;
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230 for (int i = 0, off = start, len = length; i < len; i++) {
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231 h = 31 * h + d[off++];
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232 }
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233 hash = h;
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234 }
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235
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236 @Override
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237 public boolean equals(Object obj) {
285
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238 if (false == obj instanceof PathProxy) {
267
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239 return false;
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240 }
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241 PathProxy o = (PathProxy) obj;
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242 if (o.result != null && result != null) {
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243 return result.equals(o.result);
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244 }
268
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245 if (o.length != length || o.hash != hash) {
267
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246 return false;
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247 }
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248 for (int i = 0, x = o.start, y = start; i < length; i++) {
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249 if (o.data[x++] != data[y++]) {
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250 return false;
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251 }
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252 }
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253 return true;
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254 }
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255 @Override
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256 public int hashCode() {
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257 return hash;
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258 }
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259
285
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260 public Path freeze() {
267
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261 if (result == null) {
285
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262 result = Path.create(new String(data, start, length));
268
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263 // release reference to bigger data array, make a copy of relevant part only
285
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264 // use original bytes, not those from String above to avoid cache misses due to different encodings
268
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265 byte[] d = new byte[length];
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266 System.arraycopy(data, start, d, 0, length);
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267 data = d;
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268 start = 0;
267
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269 }
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270 return result;
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271 }
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272 }
196
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273
268
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274 private static class ManifestParser implements RevlogStream.Inspector {
196
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275 private boolean gtg = true; // good to go
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276 private final Inspector inspector;
285
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277 private final Inspector2 inspector2;
267
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278 private Pool<Nodeid> nodeidPool, thisRevPool;
285
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279 private final Pool<PathProxy> fnamePool;
266
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280 private byte[] nodeidLookupBuffer = new byte[20]; // get reassigned each time new Nodeid is added to pool
262
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281
196
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282 public ManifestParser(Inspector delegate) {
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283 assert delegate != null;
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284 inspector = delegate;
285
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285 inspector2 = delegate instanceof Inspector2 ? (Inspector2) delegate : null;
267
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286 nodeidPool = new Pool<Nodeid>();
285
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287 fnamePool = new Pool<PathProxy>();
267
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288 thisRevPool = new Pool<Nodeid>();
196
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289 }
268
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290
196
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291 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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292 if (!gtg) {
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293 return;
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294 }
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295 try {
222
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296 gtg = gtg && inspector.begin(revisionNumber, new Nodeid(nodeid, true), linkRevision);
285
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297 Path fname = null;
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298 Flags flags = null;
196
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299 Nodeid nid = null;
267
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300 int i;
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301 byte[] data = da.byteArray();
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302 for (i = 0; gtg && i < actualLen; i++) {
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303 int x = i;
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304 for( ; data[i] != '\n' && i < actualLen; i++) {
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305 if (fname == null && data[i] == 0) {
285
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306 PathProxy px = fnamePool.unify(new PathProxy(data, x, i - x));
268
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307 // if (cached = fnamePool.unify(px))== px then cacheMiss, else cacheHit
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308 // cpython 0..10k: hits: 15 989 152, misses: 3020
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309 fname = px.freeze();
267
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310 x = i+1;
196
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311 }
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312 }
267
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313 if (i < actualLen) {
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314 assert data[i] == '\n';
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315 int nodeidLen = i - x < 40 ? i-x : 40; // if > 40, there are flags
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316 DigestHelper.ascii2bin(data, x, nodeidLen, nodeidLookupBuffer); // ignore return value as it's unlikely to have NULL in manifest
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317 nid = new Nodeid(nodeidLookupBuffer, false); // this Nodeid is for pool lookup only, mock object
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318 Nodeid cached = nodeidPool.unify(nid);
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319 if (cached == nid) {
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320 // buffer now belongs to the cached nodeid
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321 nodeidLookupBuffer = new byte[20];
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322 } else {
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323 nid = cached; // use existing version, discard the lookup object
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324 } // for cpython 0..10k, cache hits are 15 973 301, vs 18871 misses.
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325 thisRevPool.record(nid); // memorize revision for the next iteration.
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326 if (nodeidLen + x < i) {
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327 // 'x' and 'l' for executable bits and symlinks?
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328 // hg --debug manifest shows 644 for each regular file in my repo
285
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329 // for cpython 0..10k, there are 4361062 flag checks, and there's only 1 unique flag
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330 flags = Flags.parse(data, x + nodeidLen, i-x-nodeidLen);
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331 } else {
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332 flags = null;
267
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333 }
285
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334 if (inspector2 == null) {
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335 String flagString = flags == null ? null : flags.nativeString();
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336 gtg = inspector.next(nid, fname.toString(), flagString);
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337 } else {
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338 gtg = inspector2.next(nid, fname, flags);
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339 }
267
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340 }
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341 nid = null;
285
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342 fname = null;
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343 flags = null;
196
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344 }
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345 gtg = gtg && inspector.end(revisionNumber);
262
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346 //
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347 // keep only actual file revisions, found at this version
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348 // (next manifest is likely to refer to most of them, although in specific cases
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349 // like commit in another branch a lot may be useless)
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350 nodeidPool.clear();
267
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351 Pool<Nodeid> t = nodeidPool;
262
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352 nodeidPool = thisRevPool;
264
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353 thisRevPool = t;
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354 } catch (IOException ex) {
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355 throw new HgBadStateException(ex);
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356 }
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357 }
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358 }
218
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359
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360 private static class RevisionMapper implements RevlogStream.Inspector, Lifecycle {
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361
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362 private final int changelogRevisions;
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363 private int[] changelog2manifest;
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364 private final HgRepository repo;
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365
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366 public RevisionMapper(HgRepository hgRepo) {
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367 repo = hgRepo;
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368 changelogRevisions = repo.getChangelog().getRevisionCount();
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369 }
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370
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371 // respects TIP
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372 public int at(int revisionNumber) {
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373 if (revisionNumber == TIP) {
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374 revisionNumber = changelogRevisions - 1;
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375 }
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376 if (changelog2manifest != null) {
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377 return changelog2manifest[revisionNumber];
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378 }
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379 return revisionNumber;
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380 }
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381
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382 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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383 if (changelog2manifest != null) {
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384 // next assertion is not an error, rather assumption check, which is too development-related to be explicit exception -
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385 // I just wonder if there are manifests that have two entries pointing to single changeset. It seems unrealistic, though -
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386 // changeset records one and only one manifest nodeid
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387 assert changelog2manifest[linkRevision] == -1 : String.format("revision:%d, link:%d, already linked to revision:%d", revisionNumber, linkRevision, changelog2manifest[linkRevision]);
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388 changelog2manifest[linkRevision] = revisionNumber;
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389 } else {
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390 if (revisionNumber != linkRevision) {
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391 changelog2manifest = new int[changelogRevisions];
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392 Arrays.fill(changelog2manifest, -1);
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393 for (int i = 0; i < revisionNumber; changelog2manifest[i] = i, i++)
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394 ;
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395 changelog2manifest[linkRevision] = revisionNumber;
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396 }
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397 }
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398 }
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399
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400 public void start(int count, Callback callback, Object token) {
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401 if (count != changelogRevisions) {
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402 assert count < changelogRevisions; // no idea what to do if manifest has more revisions than changelog
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403 // the way how manifest may contain more revisions than changelog, as I can imagine, is a result of
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404 // some kind of an import tool (e.g. from SVN or CVS), that creates manifest and changelog independently.
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405 // Note, it's pure guess, I didn't see such repository yet (although the way manifest revisions
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406 // in cpython repo are numbered makes me think aforementioned way)
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407 changelog2manifest = new int[changelogRevisions];
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408 Arrays.fill(changelog2manifest, -1);
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409 }
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410 }
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411
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412 public void finish(Object token) {
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413 if (changelog2manifest == null) {
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414 return;
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415 }
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416 // I assume there'd be not too many revisions we don't know manifest of
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417 ArrayList<Integer> undefinedChangelogRevision = new ArrayList<Integer>();
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418 for (int i = 0; i < changelog2manifest.length; i++) {
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419 if (changelog2manifest[i] == -1) {
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420 undefinedChangelogRevision.add(i);
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421 }
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422 }
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423 for (int u : undefinedChangelogRevision) {
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424 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest();
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425 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup
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426 // right away in the #next (may refactor ParentWalker's sequential and sorted into dedicated helper and reuse here)
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427 changelog2manifest[u] = repo.getManifest().getLocalRevision(manifest);
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428 }
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429 }
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430 }
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431 }