Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 278:55fad5e0e98b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Ensure capacity grows regardless of initial map size. Separate unit test
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 29 Aug 2011 23:31:37 +0200
parents c5980f287cc4
children 6dbbc53fc46d
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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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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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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45 /*package-local*/ HgManifest(HgRepository hgRepo, RevlogStream content) {
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46 super(hgRepo, content);
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47 }
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48
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49 /**
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50 *
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51 * @param start changelog (not manifest!) revision to begin with
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52 * @param end changelog (not manifest!) revision to stop, inclusive.
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53 * @param inspector can't be <code>null</code>
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54 */
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55 public void walk(int start, int end, final Inspector inspector) {
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56 if (inspector == null) {
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57 throw new IllegalArgumentException();
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58 }
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59 int start0 = fromChangelog(start);
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60 int end0 = fromChangelog(end);
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61 content.iterate(start0, end0, true, new ManifestParser(inspector));
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62 }
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64 /**
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65 * "Sparse" iteration of the manifest
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66 *
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67 * @param inspector
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68 * @param localRevisions local changeset revisions to visit
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69 */
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70 public void walk(final Inspector inspector, int... localRevisions) {
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71 if (inspector == null || localRevisions == null) {
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72 throw new IllegalArgumentException();
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73 }
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74 int[] manifestLocalRevs = new int[localRevisions.length];
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75 boolean needsSort = false;
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76 for (int i = 0; i < localRevisions.length; i++) {
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77 final int manifestLocalRev = fromChangelog(localRevisions[i]);
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78 manifestLocalRevs[i] = manifestLocalRev;
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79 if (i > 0 && manifestLocalRevs[i-1] > manifestLocalRev) {
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80 needsSort = true;
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81 }
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82 }
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83 if (needsSort) {
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84 Arrays.sort(manifestLocalRevs);
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85 }
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86 content.iterate(manifestLocalRevs, true, new ManifestParser(inspector));
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87 }
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89 // manifest revision number that corresponds to the given changeset
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90 /*package-local*/ int fromChangelog(int revisionNumber) {
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91 if (HgInternals.wrongLocalRevision(revisionNumber)) {
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92 throw new IllegalArgumentException(String.valueOf(revisionNumber));
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93 }
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94 if (revisionNumber == HgRepository.WORKING_COPY || revisionNumber == HgRepository.BAD_REVISION) {
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95 throw new IllegalArgumentException("Can't use constants like WORKING_COPY or BAD_REVISION");
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96 }
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97 // revisionNumber == TIP is processed by RevisionMapper
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98 if (revisionMap == null) {
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99 revisionMap = new RevisionMapper(getRepo());
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100 content.iterate(0, TIP, false, revisionMap);
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101 }
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102 return revisionMap.at(revisionNumber);
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103 }
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105 /**
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106 * Extracts file revision as it was known at the time of given changeset.
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107 *
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108 * @param revisionNumber local changeset index
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109 * @param file path to file in question
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110 * @return file revision or <code>null</code> if manifest at specified revision doesn't list such file
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111 */
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112 @Experimental(reason="Perhaps, HgDataFile shall own this method")
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113 public Nodeid getFileRevision(int revisionNumber, final Path file) {
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114 int rev = fromChangelog(revisionNumber);
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115 final Nodeid[] rv = new Nodeid[] { null };
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116 content.iterate(rev, rev, true, new RevlogStream.Inspector() {
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118 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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119 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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120 try {
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121 byte b;
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122 while (!data.isEmpty() && (b = data.readByte()) != '\n') {
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123 if (b != 0) {
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124 bos.write(b);
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125 } else {
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126 String fname = new String(bos.toByteArray());
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127 bos.reset();
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128 if (file.toString().equals(fname)) {
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129 byte[] nid = new byte[40];
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130 data.readBytes(nid, 0, 40);
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131 rv[0] = Nodeid.fromAscii(nid, 0, 40);
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132 break;
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133 }
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134 // else skip to the end of line
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135 while (!data.isEmpty() && (b = data.readByte()) != '\n')
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136 ;
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137 }
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138 }
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139 } catch (IOException ex) {
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140 throw new HgBadStateException(ex);
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141 }
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142 }
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143 });
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144 return rv[0];
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145 }
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146
19
40532cdc92fc Inspector (visitor) for manifest
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147 public interface Inspector {
222
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148 boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision);
19
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149 boolean next(Nodeid nid, String fname, String flags);
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150 boolean end(int manifestRevision);
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151 }
267
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152
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153 public interface ElementProxy<T> {
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154 T get();
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155 }
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156
268
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157 /**
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158 * When Pool uses Strings directly,
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159 * ManifestParser creates new String instance with new char[] value, and does byte->char conversion.
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160 * For cpython repo, walk(0..10k), there are over 16 million filenames, of them only 3020 unique.
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161 * This means there are 15.9 million useless char[] instances and byte->char conversions
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162 *
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163 * When String is wrapped into {@link StringProxy}, there's extra overhead of byte[] representation
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164 * of the String, but these are only for unique Strings (3020 in the example above). Besides, I save
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165 * useless char[] and byte->char conversions.
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166 */
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167 private static class StringProxy {
267
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168 private byte[] data;
268
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169 private int start;
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170 private final int hash, length;
267
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171 private String result;
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172
268
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173 public StringProxy(byte[] data, int start, int length) {
267
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174 this.data = data;
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175 this.start = start;
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176 this.length = length;
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177
268
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178 // copy from String.hashCode(). In fact, not necessarily match result of String(data).hashCode
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179 // just need some nice algorithm here
267
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180 int h = 0;
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181 byte[] d = data;
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182 for (int i = 0, off = start, len = length; i < len; i++) {
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183 h = 31 * h + d[off++];
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184 }
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185 hash = h;
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186 }
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187
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188 @Override
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189 public boolean equals(Object obj) {
268
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190 if (false == obj instanceof StringProxy) {
267
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191 return false;
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192 }
268
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193 StringProxy o = (StringProxy) obj;
267
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194 if (o.result != null && result != null) {
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195 return result.equals(o.result);
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196 }
268
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197 if (o.length != length || o.hash != hash) {
267
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198 return false;
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199 }
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200 for (int i = 0, x = o.start, y = start; i < length; i++) {
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201 if (o.data[x++] != data[y++]) {
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202 return false;
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203 }
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204 }
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205 return true;
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206 }
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207 @Override
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208 public int hashCode() {
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209 return hash;
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210 }
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211
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212 public String freeze() {
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213 if (result == null) {
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214 result = new String(data, start, length);
268
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215 // release reference to bigger data array, make a copy of relevant part only
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216 byte[] d = new byte[length];
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217 System.arraycopy(data, start, d, 0, length);
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218 data = d;
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219 start = 0;
267
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220 }
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221 return result;
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222 }
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223 }
196
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224
268
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225 private static class ManifestParser implements RevlogStream.Inspector {
196
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226 private boolean gtg = true; // good to go
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227 private final Inspector inspector;
267
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228 private Pool<Nodeid> nodeidPool, thisRevPool;
268
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229 private final Pool<StringProxy> fnamePool;
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230 private final Pool<StringProxy> flagsPool;
266
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231 private byte[] nodeidLookupBuffer = new byte[20]; // get reassigned each time new Nodeid is added to pool
262
3dcd3dd90c77 Improve manifest parsing: decode bytes to chars once, minimize arraycopy on String instantiation, keep set of file revisions from previous manifest only
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232
196
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233 public ManifestParser(Inspector delegate) {
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234 assert delegate != null;
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235 inspector = delegate;
267
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236 nodeidPool = new Pool<Nodeid>();
268
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237 fnamePool = new Pool<StringProxy>();
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238 flagsPool = new Pool<StringProxy>();
267
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239 thisRevPool = new Pool<Nodeid>();
196
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240 }
268
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241
196
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242 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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243 if (!gtg) {
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244 return;
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245 }
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246 try {
222
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247 gtg = gtg && inspector.begin(revisionNumber, new Nodeid(nodeid, true), linkRevision);
196
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248 String fname = null;
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249 String flags = null;
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250 Nodeid nid = null;
267
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251 int i;
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252 byte[] data = da.byteArray();
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253 for (i = 0; gtg && i < actualLen; i++) {
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254 int x = i;
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255 for( ; data[i] != '\n' && i < actualLen; i++) {
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256 if (fname == null && data[i] == 0) {
268
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257 StringProxy px = fnamePool.unify(new StringProxy(data, x, i - x));
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258 // if (cached = fnamePool.unify(px))== px then cacheMiss, else cacheHit
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259 // cpython 0..10k: hits: 15 989 152, misses: 3020
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260 fname = px.freeze();
267
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261 x = i+1;
196
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262 }
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263 }
267
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264 if (i < actualLen) {
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265 assert data[i] == '\n';
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266 int nodeidLen = i - x < 40 ? i-x : 40; // if > 40, there are flags
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267 DigestHelper.ascii2bin(data, x, nodeidLen, nodeidLookupBuffer); // ignore return value as it's unlikely to have NULL in manifest
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268 nid = new Nodeid(nodeidLookupBuffer, false); // this Nodeid is for pool lookup only, mock object
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269 Nodeid cached = nodeidPool.unify(nid);
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270 if (cached == nid) {
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271 // buffer now belongs to the cached nodeid
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272 nodeidLookupBuffer = new byte[20];
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273 } else {
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274 nid = cached; // use existing version, discard the lookup object
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275 } // for cpython 0..10k, cache hits are 15 973 301, vs 18871 misses.
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276 thisRevPool.record(nid); // memorize revision for the next iteration.
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277 if (nodeidLen + x < i) {
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278 // 'x' and 'l' for executable bits and symlinks?
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279 // hg --debug manifest shows 644 for each regular file in my repo
268
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280 // for cpython 0..10k, there are 4361062 flagPool checks, and there's only 1 unique flag
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281 flags = flagsPool.unify(new StringProxy(data, x + nodeidLen, i-x-nodeidLen)).freeze();
267
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282 }
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283 gtg = gtg && inspector.next(nid, fname, flags);
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284 }
196
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285 nid = null;
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286 fname = flags = null;
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287 }
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288 gtg = gtg && inspector.end(revisionNumber);
262
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289 //
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290 // keep only actual file revisions, found at this version
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291 // (next manifest is likely to refer to most of them, although in specific cases
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292 // like commit in another branch a lot may be useless)
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293 nodeidPool.clear();
267
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294 Pool<Nodeid> t = nodeidPool;
262
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295 nodeidPool = thisRevPool;
264
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296 thisRevPool = t;
196
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297 } catch (IOException ex) {
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298 throw new HgBadStateException(ex);
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299 }
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300 }
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301 }
218
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302
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303 private static class RevisionMapper implements RevlogStream.Inspector, Lifecycle {
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304
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305 private final int changelogRevisions;
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306 private int[] changelog2manifest;
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307 private final HgRepository repo;
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308
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309 public RevisionMapper(HgRepository hgRepo) {
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310 repo = hgRepo;
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311 changelogRevisions = repo.getChangelog().getRevisionCount();
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312 }
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313
257
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314 // respects TIP
218
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315 public int at(int revisionNumber) {
257
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316 if (revisionNumber == TIP) {
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317 revisionNumber = changelogRevisions - 1;
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318 }
218
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319 if (changelog2manifest != null) {
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320 return changelog2manifest[revisionNumber];
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321 }
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322 return revisionNumber;
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323 }
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324
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325 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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326 if (changelog2manifest != null) {
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327 // next assertion is not an error, rather assumption check, which is too development-related to be explicit exception -
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328 // I just wonder if there are manifests that have two entries pointing to single changeset. It seems unrealistic, though -
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329 // changeset records one and only one manifest nodeid
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330 assert changelog2manifest[linkRevision] == -1 : String.format("revision:%d, link:%d, already linked to revision:%d", revisionNumber, linkRevision, changelog2manifest[linkRevision]);
218
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331 changelog2manifest[linkRevision] = revisionNumber;
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332 } else {
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333 if (revisionNumber != linkRevision) {
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334 changelog2manifest = new int[changelogRevisions];
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335 Arrays.fill(changelog2manifest, -1);
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336 for (int i = 0; i < revisionNumber; changelog2manifest[i] = i, i++)
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337 ;
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338 changelog2manifest[linkRevision] = revisionNumber;
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339 }
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340 }
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341 }
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342
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343 public void start(int count, Callback callback, Object token) {
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344 if (count != changelogRevisions) {
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345 assert count < changelogRevisions; // no idea what to do if manifest has more revisions than changelog
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346 // the way how manifest may contain more revisions than changelog, as I can imagine, is a result of
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347 // some kind of an import tool (e.g. from SVN or CVS), that creates manifest and changelog independently.
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348 // Note, it's pure guess, I didn't see such repository yet (although the way manifest revisions
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349 // in cpython repo are numbered makes me think aforementioned way)
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350 changelog2manifest = new int[changelogRevisions];
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351 Arrays.fill(changelog2manifest, -1);
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352 }
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353 }
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354
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355 public void finish(Object token) {
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356 if (changelog2manifest == null) {
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357 return;
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358 }
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359 // I assume there'd be not too many revisions we don't know manifest of
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360 ArrayList<Integer> undefinedChangelogRevision = new ArrayList<Integer>();
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361 for (int i = 0; i < changelog2manifest.length; i++) {
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362 if (changelog2manifest[i] == -1) {
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363 undefinedChangelogRevision.add(i);
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364 }
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365 }
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366 for (int u : undefinedChangelogRevision) {
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367 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest();
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368 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup
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369 // right away in the #next (may refactor ParentWalker's sequential and sorted into dedicated helper and reuse here)
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370 changelog2manifest[u] = repo.getManifest().getLocalRevision(manifest);
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371 }
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372 }
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373 }
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374 }