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annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 340:a54bfe0db959

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IAE using stale data from branchheads file (invalid due to repository rollback)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 17 Nov 2011 06:16:20 +0100
parents 8952f89be195
children a0864b2892cd
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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18
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19 import java.io.BufferedReader;
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20 import java.io.BufferedWriter;
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21 import java.io.File;
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22 import java.io.FileReader;
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23 import java.io.FileWriter;
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24 import java.io.IOException;
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25 import java.util.ArrayList;
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26 import java.util.Arrays;
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27 import java.util.Collections;
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28 import java.util.HashMap;
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29 import java.util.LinkedHashMap;
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30 import java.util.LinkedHashSet;
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31 import java.util.LinkedList;
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32 import java.util.List;
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33 import java.util.Map;
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34 import java.util.TreeMap;
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35 import java.util.regex.Pattern;
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36
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37 import org.tmatesoft.hg.core.Nodeid;
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38 import org.tmatesoft.hg.internal.Experimental;
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39 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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40 import org.tmatesoft.hg.util.ProgressSupport;
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41
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42 /**
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43 *
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44 * @author Artem Tikhomirov
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45 * @author TMate Software Ltd.
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46 */
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47 public class HgBranches {
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49 private final Map<String, BranchInfo> branches = new TreeMap<String, BranchInfo>();
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50 private final HgRepository repo;
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51 private boolean isCacheActual = false;
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52
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53 HgBranches(HgRepository hgRepo) {
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54 repo = hgRepo;
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55 }
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56
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57 private int readCache() /*XXX throws parse errors, e.g. may fail with NumberFormatException */{
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58 File branchheadsCache = getCacheFile();
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59 int lastInCache = -1;
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60 if (!branchheadsCache.canRead()) {
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61 return lastInCache;
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62 }
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63 BufferedReader br = null;
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64 final Pattern spacePattern = Pattern.compile(" ");
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65 try {
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66 final LinkedHashMap<String, List<Nodeid>> branchHeads = new LinkedHashMap<String, List<Nodeid>>();
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67 br = new BufferedReader(new FileReader(branchheadsCache));
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68 String line = br.readLine();
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69 if (line == null || line.trim().length() == 0) {
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70 return lastInCache;
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71 }
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72 String[] cacheIdentity = spacePattern.split(line.trim());
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73 lastInCache = Integer.parseInt(cacheIdentity[1]);
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74 final int lastKnownRepoRevIndex = repo.getChangelog().getLastRevision();
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75 if (lastInCache > lastKnownRepoRevIndex || !repo.getChangelog().getRevision(lastKnownRepoRevIndex).equals(Nodeid.fromAscii(cacheIdentity[0]))) {
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76 // there are chances cache file got invalid entries due to e.g. rollback operation
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77 return -1;
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78 }
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79 while ((line = br.readLine()) != null) {
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80 String[] elements = spacePattern.split(line.trim());
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81 if (elements.length != 2) {
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82 // bad entry
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83 continue;
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84 }
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85 // I assume split returns substrings of the original string, hence copy of a branch name
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86 String branchName = new String(elements[elements.length-1]);
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87 List<Nodeid> heads = branchHeads.get(elements[1]);
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88 if (heads == null) {
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89 branchHeads.put(branchName, heads = new LinkedList<Nodeid>());
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90 }
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91 heads.add(Nodeid.fromAscii(elements[0]));
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92 }
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93 for (Map.Entry<String, List<Nodeid>> e : branchHeads.entrySet()) {
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94 Nodeid[] heads = e.getValue().toArray(new Nodeid[e.getValue().size()]);
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95 BranchInfo bi = new BranchInfo(e.getKey(), heads);
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96 branches.put(e.getKey(), bi);
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97 }
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98 return lastInCache;
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99 } catch (IOException ex) {
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100 repo.getContext().getLog().warn(getClass(), ex, null); // log error, but otherwise do nothing
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101 } finally {
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102 if (br != null) {
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103 try {
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104 br.close();
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105 } catch (IOException ex) {
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106 repo.getContext().getLog().info(getClass(), ex, null); // ignore
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107 }
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108 }
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109 }
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110 return -1; // deliberately not lastInCache, to avoid anything but -1 when 1st line was read and there's error is in lines 2..end
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111 }
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112
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113 void collect(final ProgressSupport ps) {
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114 branches.clear();
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115 ps.start(1 + repo.getChangelog().getRevisionCount() * 2);
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116 //
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117 int lastCached = readCache();
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118 isCacheActual = lastCached == repo.getChangelog().getLastRevision();
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119 if (!isCacheActual) {
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120 final HgChangelog.ParentWalker pw = repo.getChangelog().new ParentWalker();
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121 pw.init();
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122 ps.worked(repo.getChangelog().getRevisionCount());
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123 // first revision branch found at
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124 final HashMap<String, Nodeid> branchStart = new HashMap<String, Nodeid>();
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125 // last revision seen for the branch
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126 final HashMap<String, Nodeid> branchLastSeen = new HashMap<String, Nodeid>();
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127 // revisions from the branch that have no children at all
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128 final HashMap<String, List<Nodeid>> branchHeads = new HashMap<String, List<Nodeid>>();
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129 // revisions that are immediate children of a node from a given branch
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130 // after iteration, there are some revisions left in this map (children of a branch last revision
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131 // that doesn't belong to the branch. No use of this now, perhaps can deduce isInactive (e.g.those
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132 // branches that have non-empty candidates are inactive if all their heads are roots for those left)
308
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133 final HashMap<String, List<Nodeid>> branchHeadCandidates = new HashMap<String, List<Nodeid>>();
236
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134 HgChangelog.Inspector insp = new HgChangelog.Inspector() {
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135
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136 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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137 String branchName = cset.branch();
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138 if (!branchStart.containsKey(branchName)) {
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139 branchStart.put(branchName, nodeid);
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140 branchHeads.put(branchName, new LinkedList<Nodeid>());
308
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141 branchHeadCandidates.put(branchName, new LinkedList<Nodeid>());
236
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142 } else {
308
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143 final List<Nodeid> headCandidates = branchHeadCandidates.get(branchName);
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144 if (headCandidates.remove(nodeid)) {
309
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145 // likely we don't need to keep parent anymore, as we found at least 1 child thereof to be at the same branch
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146 // however, it's possible the child we found is a result of an earlier fork, and revision in the
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147 // branchLastSeen is 'parallel' head, which needs to be kept
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148 Nodeid lastSeenInBranch = branchLastSeen.get(branchName);
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149 // check if current revision is on descendant line. Seems direct parents check is enough
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150 if (pw.safeFirstParent(nodeid).equals(lastSeenInBranch) || pw.safeSecondParent(nodeid).equals(lastSeenInBranch)) {
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151 branchLastSeen.remove(branchName);
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152 }
236
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153 }
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154 }
308
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155 List<Nodeid> immediateChildren = pw.directChildren(nodeid);
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156 if (immediateChildren.size() > 0) {
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157 // 1) children may be in another branch
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158 // and unless we later came across another element from this branch,
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159 // we need to record all these as potential heads
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160 //
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161 // 2) head1 with children in different branch, and head2 in this branch without children
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162 branchLastSeen.put(branchName, nodeid);
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163 branchHeadCandidates.get(branchName).addAll(immediateChildren);
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164 } else {
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165 // no more children known for this node, it's (one of the) head of the branch
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166 branchHeads.get(branchName).add(nodeid);
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167 }
236
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168 ps.worked(1);
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169 }
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170 };
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171 repo.getChangelog().range(lastCached == -1 ? 0 : lastCached+1, HgRepository.TIP, insp);
308
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172 // those last seen revisions from the branch that had no children from the same branch are heads.
236
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173 for (String bn : branchLastSeen.keySet()) {
308
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174 // these are inactive branches? - there were children, but not from the same branch?
236
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175 branchHeads.get(bn).add(branchLastSeen.get(bn));
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176 }
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177 for (String bn : branchStart.keySet()) {
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178 BranchInfo bi = branches.get(bn);
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179 if (bi != null) {
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180 // although heads from cache shall not intersect with heads after lastCached,
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181 // use of LHS doesn't hurt (and makes sense e.g. if cache is not completely correct in my tests)
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182 LinkedHashSet<Nodeid> heads = new LinkedHashSet<Nodeid>(bi.getHeads());
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183 for (Nodeid oldHead : bi.getHeads()) {
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184 // XXX perhaps, need pw.canReach(Nodeid from, Collection<Nodeid> to)
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185 List<Nodeid> newChildren = pw.childrenOf(Collections.singletonList(oldHead));
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186 if (!newChildren.isEmpty()) {
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187 // likely not a head any longer,
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188 // check if any new head can be reached from old one, and, if yes,
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189 // do not consider that old head as head.
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190 for (Nodeid newHead : branchHeads.get(bn)) {
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191 if (newChildren.contains(newHead)) {
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192 heads.remove(oldHead);
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193 break;
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194 }
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195 }
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196 } // else - oldHead still head for the branch
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197 }
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198 heads.addAll(branchHeads.get(bn));
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199 bi = new BranchInfo(bn, bi.getStart(), heads.toArray(new Nodeid[0]));
236
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200 } else {
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201 Nodeid[] heads = branchHeads.get(bn).toArray(new Nodeid[0]);
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202 bi = new BranchInfo(bn, branchStart.get(bn), heads);
236
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203 }
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204 branches.put(bn, bi);
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205 }
220
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206 }
308
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207 final HgChangelog clog = repo.getChangelog();
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208 final HgChangelog.RevisionMap rmap = clog.new RevisionMap().init();
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209 for (BranchInfo bi : branches.values()) {
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210 bi.validate(clog, rmap);
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211 }
220
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212 ps.done();
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213 }
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214
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215 public List<BranchInfo> getAllBranches() {
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216 return new LinkedList<BranchInfo>(branches.values());
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217
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218 }
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219
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220 public BranchInfo getBranch(String name) {
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221 return branches.get(name);
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222 }
244
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223
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224 /**
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225 * Writes down information about repository branches in a format Mercurial native client can understand.
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226 * Cache file gets overwritten only if it is out of date (i.e. misses some branch information)
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227 */
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228 @Experimental(reason="Usage of cache isn't supposed to be public knowledge")
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229 public void writeCache() {
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230 if (isCacheActual) {
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231 return;
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232 }
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233 try {
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234 File branchheadsCache = getCacheFile();
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235 if (!branchheadsCache.exists()) {
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236 branchheadsCache.getParentFile().mkdirs(); // just in case cache/ doesn't exist jet
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237 branchheadsCache.createNewFile();
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238 }
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239 if (!branchheadsCache.canWrite()) {
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240 return;
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241 }
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242 final int lastRev = repo.getChangelog().getLastRevision();
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243 final Nodeid lastNid = repo.getChangelog().getRevision(lastRev);
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244 BufferedWriter bw = new BufferedWriter(new FileWriter(branchheadsCache));
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245 bw.write(lastNid.toString());
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246 bw.write((int) ' ');
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247 bw.write(Integer.toString(lastRev));
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248 bw.write("\n");
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249 for (BranchInfo bi : branches.values()) {
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250 for (Nodeid nid : bi.getHeads()) {
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251 bw.write(nid.toString());
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252 bw.write((int) ' ');
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253 bw.write(bi.getName());
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254 bw.write("\n");
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255 }
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256 }
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257 bw.close();
295
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258 } catch (IOException ex) {
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259 repo.getContext().getLog().error(getClass(), ex, "Error writing branch cache file");
244
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260 }
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261 }
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262
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263 private File getCacheFile() {
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264 // prior to 1.8 used to be .hg/branchheads.cache
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265 return new File(repo.getRepositoryRoot(), "cache/branchheads");
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266 }
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267
220
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268 public static class BranchInfo {
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269 private final String name;
308
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270 private List<Nodeid> heads;
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271 private boolean closed;
220
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272 private final Nodeid start;
315
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273 private List<Nodeid> closedHeads; // subset of heads, those that bear 'closed' flag, or null if closed == true
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274
236
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275 // XXX in fact, few but not all branchHeads might be closed, and isClosed for whole branch is not
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276 // possible to determine.
308
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277 BranchInfo(String branchName, Nodeid first, Nodeid[] branchHeads) {
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278 name = branchName;
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279 start = first;
308
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280 heads = Arrays.asList(branchHeads);
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281 }
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282
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283 // incomplete branch, there's not enough information at the time of creation. shall be replaced with
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284 // proper BI in #collect()
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285 BranchInfo(String branchName, Nodeid[] branchHeads) {
308
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286 this(branchName, Nodeid.NULL, branchHeads);
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287 }
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288
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289 void validate(HgChangelog clog, HgChangelog.RevisionMap rmap) {
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290 int[] localCset = new int[heads.size()];
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291 int i = 0;
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292 for (Nodeid h : heads) {
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293 localCset[i++] = rmap.localRevision(h);
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294 }
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295 // [0] tipmost, [1] tipmost open
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296 final Nodeid[] tipmost = new Nodeid[] {null, null};
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297 final boolean[] allClosed = new boolean[] { true };
315
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298 final ArrayList<Nodeid> _closedHeads = new ArrayList<Nodeid>(heads.size());
308
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299 clog.range(new HgChangelog.Inspector() {
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300
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301 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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302 assert heads.contains(nodeid);
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303 tipmost[0] = nodeid;
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304 if (!"1".equals(cset.extras().get("close"))) {
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305 tipmost[1] = nodeid;
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306 allClosed[0] = false;
315
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307 } else {
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308 _closedHeads.add(nodeid);
308
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309 }
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310 }
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311 }, localCset);
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312 closed = allClosed[0];
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313 Nodeid[] outcome = new Nodeid[localCset.length];
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314 i = 0;
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315 if (!closed && tipmost[1] != null) {
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316 outcome[i++] = tipmost[1];
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317 if (i < outcome.length && !tipmost[0].equals(tipmost[1])) {
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318 outcome[i++] = tipmost[0];
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319 }
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320 } else {
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321 outcome[i++] = tipmost[0];
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322 }
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323 for (Nodeid h : heads) {
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324 if (!h.equals(tipmost[0]) && !h.equals(tipmost[1])) {
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325 outcome[i++] = h;
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326 }
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327 }
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328 heads = Arrays.asList(outcome);
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329 if (closed) {
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330 // no need
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331 closedHeads = null;
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332 } else {
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333 _closedHeads.trimToSize();
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334 closedHeads = _closedHeads;
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335 }
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336 }
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337
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338 public String getName() {
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339 return name;
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340 }
308
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341 /**
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342 * @return <code>true</code> if all heads of this branch are marked as closed
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343 */
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344 public boolean isClosed() {
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345 return closed;
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346 }
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347
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348 /**
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349 * @return all heads for the branch, both open and closed, tip-most head first
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350 */
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351 public List<Nodeid> getHeads() {
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352 return heads;
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353 }
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354
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355 /**
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356 *
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357 * @param head one of revision from {@link #getHeads() heads} of this branch
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358 * @return true if this particular head is closed
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359 * @throws IllegalArgumentException if argument is not from {@link #getHeads() heads} of this branch
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360 */
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361 public boolean isClosed(Nodeid head) {
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362 if (!heads.contains(head)) {
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363 throw new IllegalArgumentException(String.format("Revision %s does not belong to heads of %s branch", head, name), null);
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364 }
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365 if (closed) {
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366 return true;
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367 }
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368 return closedHeads.contains(head);
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369 }
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370 // public Nodeid getTip() {
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371 // }
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372 /*public*/ Nodeid getStart() {
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373 // first node where branch appears
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374 return start;
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375 }
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376 }
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377 }