Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 268:c5980f287cc4

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Use StringProxy when parsing manifest to minimize number of useless conversions and array instances
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 23 Aug 2011 22:30:56 +0200
parents ec921ef0628e
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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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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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 }