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annotate src/org/tmatesoft/hg/repo/HgStatusCollector.java @ 197:3a7696fb457c

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Investigate optimization options to allow fast processing of huge repositories. Fix defect in StatusCollector that lead to wrong result comparing first revision to empty repo (-1 to 0), due to same TIP constant value
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 19 Apr 2011 03:49:29 +0200
parents c9b305df0b89
children 047b1dec7a04
rev   line source
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1 /*
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2 * Copyright (c) 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.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21
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22 import java.util.Collection;
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23 import java.util.Collections;
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24 import java.util.LinkedHashMap;
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25 import java.util.LinkedList;
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26 import java.util.List;
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27 import java.util.Map;
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28 import java.util.SortedMap;
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29 import java.util.TreeMap;
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30 import java.util.TreeSet;
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31
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32 import org.tmatesoft.hg.core.HgDataStreamException;
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33 import org.tmatesoft.hg.core.Nodeid;
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34 import org.tmatesoft.hg.internal.Pool;
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35 import org.tmatesoft.hg.util.Path;
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36 import org.tmatesoft.hg.util.PathPool;
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37 import org.tmatesoft.hg.util.PathRewrite;
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39
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40 /**
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41 * RevisionWalker?
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class HgStatusCollector {
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48 private final HgRepository repo;
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49 private final SortedMap<Integer, ManifestRevisionInspector> cache; // sparse array, in fact
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50 // with cpython repository, ~70 000 changes, complete Log (direct out, no reverse) output
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51 // no cache limit, no nodeids and fname caching - OOME on changeset 1035
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52 // no cache limit, but with cached nodeids and filenames - 1730+
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53 // cache limit 100 - 19+ minutes to process 10000, and still working (too long, stopped)
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54 private final int cacheMaxSize = 50; // do not keep too much manifest revisions
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55 private PathPool pathPool;
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56 private final Pool<Nodeid> cacheNodes;
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57 private final Pool<String> cacheFilenames; // XXX in fact, need to think if use of PathPool directly instead is better solution
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58 private final ManifestRevisionInspector emptyFakeState;
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61 public HgStatusCollector(HgRepository hgRepo) {
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62 this.repo = hgRepo;
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63 cache = new TreeMap<Integer, ManifestRevisionInspector>();
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64 cacheNodes = new Pool<Nodeid>();
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65 cacheFilenames = new Pool<String>();
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67 emptyFakeState = new ManifestRevisionInspector(null, null);
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68 emptyFakeState.begin(-1, null);
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69 emptyFakeState.end(-1);
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70 }
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72 public HgRepository getRepo() {
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73 return repo;
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74 }
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76 private ManifestRevisionInspector get(int rev) {
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77 ManifestRevisionInspector i = cache.get(rev);
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78 if (i == null) {
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79 if (rev == -1) {
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80 return emptyFakeState;
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81 }
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82 while (cache.size() > cacheMaxSize) {
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83 // assume usually we go from oldest to newest, hence remove oldest as most likely to be no longer necessary
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84 cache.remove(cache.firstKey());
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85 }
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86 i = new ManifestRevisionInspector(cacheNodes, cacheFilenames);
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87 cache.put(rev, i);
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88 repo.getManifest().walk(rev, rev, i);
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89 }
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90 return i;
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91 }
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93 private boolean cached(int revision) {
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94 return cache.containsKey(revision) || revision == -1;
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95 }
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97 private void initCacheRange(int minRev, int maxRev) {
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98 while (cache.size() > cacheMaxSize) {
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99 // assume usually we go from oldest to newest, hence remove oldest as most likely to be no longer necessary
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100 cache.remove(cache.firstKey());
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101 }
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102 repo.getManifest().walk(minRev, maxRev, new HgManifest.Inspector() {
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103 private ManifestRevisionInspector delegate;
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104 private boolean cacheHit; // range may include revisions we already know about, do not re-create them
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106 public boolean begin(int revision, Nodeid nid) {
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107 assert delegate == null;
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108 if (cache.containsKey(revision)) { // don't need to check emptyFakeState hit as revision never -1 here
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109 cacheHit = true;
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110 } else {
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111 cache.put(revision, delegate = new ManifestRevisionInspector(cacheNodes, cacheFilenames));
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112 // cache may grow bigger than max size here, but it's ok as present simplistic cache clearing mechanism may
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113 // otherwise remove entries we just added
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114 delegate.begin(revision, nid);
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115 cacheHit = false;
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116 }
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117 return true;
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118 }
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119
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120 public boolean next(Nodeid nid, String fname, String flags) {
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121 if (!cacheHit) {
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122 delegate.next(nid, fname, flags);
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123 }
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124 return true;
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125 }
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126
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127 public boolean end(int revision) {
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128 if (!cacheHit) {
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129 delegate.end(revision);
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130 }
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131 cacheHit = false;
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132 delegate = null;
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133 return true;
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134 }
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135 });
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136 }
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137
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138 /*package-local*/ ManifestRevisionInspector raw(int rev) {
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139 return get(rev);
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140 }
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141 /*package-local*/ PathPool getPathPool() {
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142 if (pathPool == null) {
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143 pathPool = new PathPool(new PathRewrite.Empty());
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144 }
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145 return pathPool;
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146 }
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147
142
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148 /**
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149 * Allows sharing of a common path cache
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150 */
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151 public void setPathPool(PathPool pathPool) {
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152 this.pathPool = pathPool;
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153 }
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154
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155
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156 // hg status --change <rev>
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157 public void change(int rev, HgStatusInspector inspector) {
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158 int[] parents = new int[2];
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159 repo.getChangelog().parents(rev, parents, null, null);
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160 walk(parents[0], rev, inspector);
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161 }
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162
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163 // I assume revision numbers are the same for changelog and manifest - here
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164 // user would like to pass changelog revision numbers, and I use them directly to walk manifest.
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165 // if this assumption is wrong, fix this (lookup manifest revisions from changeset).
197
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166 // rev1 and rev2 may be -1 to indicate comparison to empty repository
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167 // argument order matters
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168 public void walk(int rev1, int rev2, HgStatusInspector inspector) {
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169 if (rev1 == rev2) {
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170 throw new IllegalArgumentException();
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171 }
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172 if (inspector == null) {
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173 throw new IllegalArgumentException();
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174 }
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175 if (inspector instanceof Record) {
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176 ((Record) inspector).init(rev1, rev2, this);
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177 }
197
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178 final int lastManifestRevision = repo.getManifest().getLastRevision();
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179 if (rev1 == TIP) {
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180 rev1 = lastManifestRevision;
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181 }
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182 if (rev2 == TIP) {
197
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183 rev2 = lastManifestRevision;
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184 }
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185 // in fact, rev1 and rev2 are often next (or close) to each other,
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186 // thus, we can optimize Manifest reads here (manifest.walk(rev1, rev2))
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187 ManifestRevisionInspector r1, r2 ;
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188 boolean need1 = !cached(rev1), need2 = !cached(rev2);
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189 if (need1 || need2) {
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190 int minRev, maxRev;
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191 if (need1 && need2 && Math.abs(rev1 - rev2) < 5 /*subjective equivalent of 'close enough'*/) {
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192 minRev = rev1 < rev2 ? rev1 : rev2;
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193 maxRev = minRev == rev1 ? rev2 : rev1;
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194 if (minRev > 0) {
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195 minRev--; // expand range a bit
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196 }
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197 initCacheRange(minRev, maxRev);
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198 need1 = need2 = false;
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199 }
197
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200 // either both unknown and far from each other, or just one of them.
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201 // read with neighbors to save potential subsequent calls for neighboring elements
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202 // XXX perhaps, if revlog.baseRevision is cheap, shall expand minRev up to baseRevision
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203 // which going to be read anyway
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204 if (need1) {
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205 minRev = rev1;
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206 maxRev = rev1 < lastManifestRevision-5 ? rev1+5 : lastManifestRevision;
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207 initCacheRange(minRev, maxRev);
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208 }
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209 if (need2) {
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210 minRev = rev2;
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211 maxRev = rev2 < lastManifestRevision-5 ? rev2+5 : lastManifestRevision;
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212 initCacheRange(minRev, maxRev);
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213 }
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214 }
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215 r1 = get(rev1);
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216 r2 = get(rev2);
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217
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218 PathPool pp = getPathPool();
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219
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220 TreeSet<String> r1Files = new TreeSet<String>(r1.files());
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221 for (String fname : r2.files()) {
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222 if (r1Files.remove(fname)) {
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223 Nodeid nidR1 = r1.nodeid(fname);
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224 Nodeid nidR2 = r2.nodeid(fname);
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225 String flagsR1 = r1.flags(fname);
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226 String flagsR2 = r2.flags(fname);
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227 if (nidR1.equals(nidR2) && ((flagsR2 == null && flagsR1 == null) || flagsR2.equals(flagsR1))) {
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228 inspector.clean(pp.path(fname));
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229 } else {
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230 inspector.modified(pp.path(fname));
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231 }
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232 } else {
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233 try {
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234 Path copyTarget = pp.path(fname);
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235 Path copyOrigin = getOriginIfCopy(repo, copyTarget, r1Files, rev1);
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236 if (copyOrigin != null) {
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237 inspector.copied(pp.path(copyOrigin) /*pipe through pool, just in case*/, copyTarget);
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238 } else {
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239 inspector.added(copyTarget);
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240 }
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241 } catch (HgDataStreamException ex) {
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242 ex.printStackTrace();
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243 // FIXME perhaps, shall record this exception to dedicated mediator and continue
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244 // for a single file not to be irresolvable obstacle for a status operation
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245 }
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246 }
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247 }
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248 for (String left : r1Files) {
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249 inspector.removed(pp.path(left));
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250 }
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251 }
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252
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253 public Record status(int rev1, int rev2) {
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254 Record rv = new Record();
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255 walk(rev1, rev2, rv);
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256 return rv;
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257 }
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258
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259 /*package-local*/static Path getOriginIfCopy(HgRepository hgRepo, Path fname, Collection<String> originals, int originalChangelogRevision) throws HgDataStreamException {
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260 HgDataFile df = hgRepo.getFileNode(fname);
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261 while (df.isCopy()) {
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262 Path original = df.getCopySourceName();
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263 if (originals.contains(original.toString())) {
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264 df = hgRepo.getFileNode(original);
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265 int changelogRevision = df.getChangesetLocalRevision(0);
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266 if (changelogRevision <= originalChangelogRevision) {
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267 // copy/rename source was known prior to rev1
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268 // (both r1Files.contains is true and original was created earlier than rev1)
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269 // without r1Files.contains changelogRevision <= rev1 won't suffice as the file
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270 // might get removed somewhere in between (changelogRevision < R < rev1)
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271 return original;
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272 }
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273 break; // copy/rename done later
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274 }
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275 df = hgRepo.getFileNode(original); // try more steps away
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276 }
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277 return null;
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278 }
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279
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280 // XXX for r1..r2 status, only modified, added, removed (and perhaps, clean) make sense
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281 // XXX Need to specify whether copy targets are in added or not (@see Inspector#copied above)
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282 public static class Record implements HgStatusInspector {
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283 private List<Path> modified, added, removed, clean, missing, unknown, ignored;
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284 private Map<Path, Path> copied;
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285
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286 private int startRev, endRev;
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287 private HgStatusCollector statusHelper;
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288
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289 // XXX StatusCollector may additionally initialize Record instance to speed lookup of changed file revisions
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290 // here I need access to ManifestRevisionInspector via #raw(). Perhaps, non-static class (to get
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291 // implicit reference to StatusCollector) may be better?
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292 // Since users may want to reuse Record instance we've once created (and initialized), we need to
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293 // ensure functionality is correct for each/any call (#walk checks instanceof Record and fixes it up)
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294 // Perhaps, distinct helper (sc.getRevisionHelper().nodeid(fname)) would be better, just not clear
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295 // how to supply [start..end] values there easily
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296 /*package-local*/void init(int startRevision, int endRevision, HgStatusCollector self) {
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297 startRev = startRevision;
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298 endRev = endRevision;
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299 statusHelper = self;
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300 }
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301
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302 public Nodeid nodeidBeforeChange(Path fname) {
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303 if (statusHelper == null || startRev == BAD_REVISION) {
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304 return null;
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305 }
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306 if ((modified == null || !modified.contains(fname)) && (removed == null || !removed.contains(fname))) {
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307 return null;
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308 }
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309 return statusHelper.raw(startRev).nodeid(fname.toString());
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310 }
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311 public Nodeid nodeidAfterChange(Path fname) {
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312 if (statusHelper == null || endRev == BAD_REVISION) {
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313 return null;
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314 }
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315 if ((modified == null || !modified.contains(fname)) && (added == null || !added.contains(fname))) {
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316 return null;
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317 }
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318 return statusHelper.raw(endRev).nodeid(fname.toString());
64
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319 }
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diff changeset
320
93
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321 public List<Path> getModified() {
55
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322 return proper(modified);
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323 }
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324
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325 public List<Path> getAdded() {
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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326 return proper(added);
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327 }
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328
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329 public List<Path> getRemoved() {
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05829a70b30b Status operation extracted into separate, cache-friendly class
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330 return proper(removed);
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331 }
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332
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diff changeset
333 public Map<Path,Path> getCopied() {
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05829a70b30b Status operation extracted into separate, cache-friendly class
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334 if (copied == null) {
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335 return Collections.emptyMap();
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336 }
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337 return Collections.unmodifiableMap(copied);
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338 }
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339
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diff changeset
340 public List<Path> getClean() {
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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341 return proper(clean);
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342 }
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343
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344 public List<Path> getMissing() {
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345 return proper(missing);
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346 }
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347
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348 public List<Path> getUnknown() {
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349 return proper(unknown);
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350 }
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351
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diff changeset
352 public List<Path> getIgnored() {
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353 return proper(ignored);
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354 }
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355
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diff changeset
356 private List<Path> proper(List<Path> l) {
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357 if (l == null) {
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358 return Collections.emptyList();
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359 }
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360 return Collections.unmodifiableList(l);
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361 }
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362
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363 //
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364 //
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365
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366 public void modified(Path fname) {
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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367 modified = doAdd(modified, fname);
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368 }
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369
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diff changeset
370 public void added(Path fname) {
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05829a70b30b Status operation extracted into separate, cache-friendly class
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371 added = doAdd(added, fname);
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372 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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373
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diff changeset
374 public void copied(Path fnameOrigin, Path fnameAdded) {
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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375 if (copied == null) {
93
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diff changeset
376 copied = new LinkedHashMap<Path, Path>();
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diff changeset
377 }
74
6f1b88693d48 Complete refactoring to org.tmatesoft
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diff changeset
378 added(fnameAdded);
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diff changeset
379 copied.put(fnameAdded, fnameOrigin);
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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380 }
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diff changeset
381
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diff changeset
382 public void removed(Path fname) {
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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383 removed = doAdd(removed, fname);
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
384 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
385
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diff changeset
386 public void clean(Path fname) {
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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387 clean = doAdd(clean, fname);
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
388 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
389
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diff changeset
390 public void missing(Path fname) {
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
391 missing = doAdd(missing, fname);
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
392 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
393
93
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diff changeset
394 public void unknown(Path fname) {
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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395 unknown = doAdd(unknown, fname);
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
396 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
397
93
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diff changeset
398 public void ignored(Path fname) {
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
399 ignored = doAdd(ignored, fname);
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
400 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
401
93
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diff changeset
402 private static List<Path> doAdd(List<Path> l, Path p) {
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
403 if (l == null) {
93
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diff changeset
404 l = new LinkedList<Path>();
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
405 }
93
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diff changeset
406 l.add(p);
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
407 return l;
05829a70b30b Status operation extracted into separate, cache-friendly class
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parents:
diff changeset
408 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
409 }
195
c9b305df0b89 Optimization: use ParentWalker to get changeset's parents, if possible. Do not keep duplicating nodeids and strings in manifest revisions
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diff changeset
410
89
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
411 /*package-local*/ static final class ManifestRevisionInspector implements HgManifest.Inspector {
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
412 private final TreeMap<String, Nodeid> idsMap;
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
413 private final TreeMap<String, String> flagsMap;
195
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diff changeset
414 private final Pool<Nodeid> idsPool;
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diff changeset
415 private final Pool<String> namesPool;
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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parents:
diff changeset
416
195
c9b305df0b89 Optimization: use ParentWalker to get changeset's parents, if possible. Do not keep duplicating nodeids and strings in manifest revisions
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diff changeset
417 // optional pools for effective management of nodeids and filenames (they are likely
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diff changeset
418 // to be duplicated among different manifest revisions
c9b305df0b89 Optimization: use ParentWalker to get changeset's parents, if possible. Do not keep duplicating nodeids and strings in manifest revisions
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diff changeset
419 public ManifestRevisionInspector(Pool<Nodeid> nodeidPool, Pool<String> filenamePool) {
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diff changeset
420 idsPool = nodeidPool;
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diff changeset
421 namesPool = filenamePool;
89
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
422 idsMap = new TreeMap<String, Nodeid>();
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
423 flagsMap = new TreeMap<String, String>();
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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parents:
diff changeset
424 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
425
89
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
426 public Collection<String> files() {
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
427 return idsMap.keySet();
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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parents:
diff changeset
428 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
429
89
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
430 public Nodeid nodeid(String fname) {
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
431 return idsMap.get(fname);
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
432 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
433
89
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
434 public String flags(String fname) {
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
435 return flagsMap.get(fname);
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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parents:
diff changeset
436 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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parents:
diff changeset
437
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
438 //
05829a70b30b Status operation extracted into separate, cache-friendly class
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parents:
diff changeset
439
05829a70b30b Status operation extracted into separate, cache-friendly class
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diff changeset
440 public boolean next(Nodeid nid, String fname, String flags) {
195
c9b305df0b89 Optimization: use ParentWalker to get changeset's parents, if possible. Do not keep duplicating nodeids and strings in manifest revisions
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diff changeset
441 if (namesPool != null) {
c9b305df0b89 Optimization: use ParentWalker to get changeset's parents, if possible. Do not keep duplicating nodeids and strings in manifest revisions
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diff changeset
442 fname = namesPool.unify(fname);
c9b305df0b89 Optimization: use ParentWalker to get changeset's parents, if possible. Do not keep duplicating nodeids and strings in manifest revisions
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diff changeset
443 }
c9b305df0b89 Optimization: use ParentWalker to get changeset's parents, if possible. Do not keep duplicating nodeids and strings in manifest revisions
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diff changeset
444 if (idsPool != null) {
c9b305df0b89 Optimization: use ParentWalker to get changeset's parents, if possible. Do not keep duplicating nodeids and strings in manifest revisions
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diff changeset
445 nid = idsPool.unify(nid);
c9b305df0b89 Optimization: use ParentWalker to get changeset's parents, if possible. Do not keep duplicating nodeids and strings in manifest revisions
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diff changeset
446 }
89
42bcb4bffd17 Refactored to simplify manifest collector
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diff changeset
447 idsMap.put(fname, nid);
197
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448 if (flags != null) {
3a7696fb457c Investigate optimization options to allow fast processing of huge repositories. Fix defect in StatusCollector that lead to wrong result comparing first revision to empty repo (-1 to 0), due to same TIP constant value
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449 // TreeMap$Entry takes 32 bytes. No reason to keep null for such price
3a7696fb457c Investigate optimization options to allow fast processing of huge repositories. Fix defect in StatusCollector that lead to wrong result comparing first revision to empty repo (-1 to 0), due to same TIP constant value
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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450 // Perhaps, Map<String, Pair<Nodeid, String>> might be better solution
3a7696fb457c Investigate optimization options to allow fast processing of huge repositories. Fix defect in StatusCollector that lead to wrong result comparing first revision to empty repo (-1 to 0), due to same TIP constant value
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 195
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451 flagsMap.put(fname, flags);
3a7696fb457c Investigate optimization options to allow fast processing of huge repositories. Fix defect in StatusCollector that lead to wrong result comparing first revision to empty repo (-1 to 0), due to same TIP constant value
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 195
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452 }
55
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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453 return true;
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454 }
05829a70b30b Status operation extracted into separate, cache-friendly class
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455
05829a70b30b Status operation extracted into separate, cache-friendly class
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456 public boolean end(int revision) {
89
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457 // in fact, this class cares about single revision
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458 return false;
55
05829a70b30b Status operation extracted into separate, cache-friendly class
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459 }
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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460
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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461 public boolean begin(int revision, Nodeid nid) {
05829a70b30b Status operation extracted into separate, cache-friendly class
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462 return true;
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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463 }
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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464 }
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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465
05829a70b30b Status operation extracted into separate, cache-friendly class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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466 }