Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 631:8a5cdcb27b8f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
AIOOBE in HgManifest.RevisionMapper. Provide more details about exception context. Create lock file atomically. Test concurrent pull-rebase and read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 30 May 2013 15:24:17 +0200
parents 6526d8adbc0f
children 12a4f60ea972 a5cf64f2e7e4
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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18
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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20 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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21
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22 import java.io.BufferedReader;
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23 import java.io.BufferedWriter;
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24 import java.io.File;
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25 import java.io.FileReader;
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26 import java.io.FileWriter;
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27 import java.io.IOException;
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28 import java.util.ArrayList;
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29 import java.util.Arrays;
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30 import java.util.Collections;
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31 import java.util.HashMap;
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32 import java.util.LinkedHashMap;
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33 import java.util.LinkedHashSet;
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34 import java.util.LinkedList;
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35 import java.util.List;
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36 import java.util.Map;
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37 import java.util.TreeMap;
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38 import java.util.regex.Pattern;
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40 import org.tmatesoft.hg.core.Nodeid;
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41 import org.tmatesoft.hg.internal.ChangelogMonitor;
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42 import org.tmatesoft.hg.internal.Experimental;
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43 import org.tmatesoft.hg.internal.FileUtils;
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44 import org.tmatesoft.hg.internal.Internals;
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45 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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46 import org.tmatesoft.hg.util.ProgressSupport;
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47
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48 /**
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49 *
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50 * @author Artem Tikhomirov
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51 * @author TMate Software Ltd.
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52 */
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53 public class HgBranches {
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54
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55 private final Internals internalRepo;
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56 private final ChangelogMonitor repoChangeTracker;
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57 private final Map<String, BranchInfo> branches = new TreeMap<String, BranchInfo>();
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58 private boolean isCacheActual = false;
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59
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60 HgBranches(Internals internals) {
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61 internalRepo = internals;
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62 repoChangeTracker = new ChangelogMonitor(internals.getRepo());
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63 }
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64
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65 private int readCache() {
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66 final HgRepository repo = internalRepo.getRepo();
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67 File branchheadsCache = getCacheFile();
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68 int lastInCache = -1;
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69 if (!branchheadsCache.canRead()) {
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70 return lastInCache;
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71 }
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72 BufferedReader br = null; // TODO replace with LineReader
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73 final Pattern spacePattern = Pattern.compile(" ");
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74 try {
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75 final LinkedHashMap<String, List<Nodeid>> branchHeads = new LinkedHashMap<String, List<Nodeid>>();
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76 br = new BufferedReader(new FileReader(branchheadsCache));
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77 String line = br.readLine();
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78 if (line == null || line.trim().length() == 0) {
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79 return lastInCache;
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80 }
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81 String[] cacheIdentity = spacePattern.split(line.trim());
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82 lastInCache = Integer.parseInt(cacheIdentity[1]);
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83 final int lastKnownRepoRevIndex = repo.getChangelog().getLastRevision();
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84 if (lastInCache > lastKnownRepoRevIndex || !repo.getChangelog().getRevision(lastKnownRepoRevIndex).equals(Nodeid.fromAscii(cacheIdentity[0]))) {
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85 // there are chances cache file got invalid entries due to e.g. rollback operation
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86 return -1;
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87 }
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88 while ((line = br.readLine()) != null) {
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89 String[] elements = spacePattern.split(line.trim());
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90 if (elements.length != 2) {
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91 // bad entry
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92 continue;
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93 }
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94 // I assume split returns substrings of the original string, hence copy of a branch name
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95 String branchName = new String(elements[elements.length-1]);
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96 List<Nodeid> heads = branchHeads.get(elements[1]);
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97 if (heads == null) {
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98 branchHeads.put(branchName, heads = new LinkedList<Nodeid>());
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99 }
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100 heads.add(Nodeid.fromAscii(elements[0]));
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101 }
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102 for (Map.Entry<String, List<Nodeid>> e : branchHeads.entrySet()) {
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103 Nodeid[] heads = e.getValue().toArray(new Nodeid[e.getValue().size()]);
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104 BranchInfo bi = new BranchInfo(e.getKey(), heads);
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105 branches.put(e.getKey(), bi);
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106 }
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107 return lastInCache;
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108 } catch (IOException ex) {
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109 // log error, but otherwise do nothing
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110 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null);
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111 // FALL THROUGH to return -1 indicating no cache information
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112 } catch (NumberFormatException ex) {
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113 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null);
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114 // FALL THROUGH
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115 } catch (HgRuntimeException ex) {
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116 // if happens, log error and pretend there's no cache
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117 repo.getSessionContext().getLog().dump(getClass(), Error, ex, null);
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118 // FALL THROUGH
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119 } finally {
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120 new FileUtils(repo.getSessionContext().getLog()).closeQuietly(br);
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121 }
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122 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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123 }
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124
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125 void collect(final ProgressSupport ps) throws HgRuntimeException {
236
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126 branches.clear();
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127 final HgRepository repo = internalRepo.getRepo();
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128 ps.start(1 + repo.getChangelog().getRevisionCount() * 2);
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129 //
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130 int lastCached = readCache();
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131 isCacheActual = lastCached == repo.getChangelog().getLastRevision();
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132 if (!isCacheActual) {
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133 final HgParentChildMap<HgChangelog> pw = new HgParentChildMap<HgChangelog>(repo.getChangelog());
236
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134 pw.init();
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135 ps.worked(repo.getChangelog().getRevisionCount());
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136 // first revision branch found at
236
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137 final HashMap<String, Nodeid> branchStart = new HashMap<String, Nodeid>();
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138 // last revision seen for the branch
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139 final HashMap<String, Nodeid> branchLastSeen = new HashMap<String, Nodeid>();
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140 // revisions from the branch that have no children at all
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141 final HashMap<String, List<Nodeid>> branchHeads = new HashMap<String, List<Nodeid>>();
309
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142 // revisions that are immediate children of a node from a given branch
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143 // after iteration, there are some revisions left in this map (children of a branch last revision
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144 // that doesn't belong to the branch. No use of this now, perhaps can deduce isInactive (e.g.those
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145 // branches that have non-empty candidates are inactive if all their heads are roots for those left)
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146 final HashMap<String, List<Nodeid>> branchHeadCandidates = new HashMap<String, List<Nodeid>>();
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147 HgChangelog.Inspector insp = new HgChangelog.Inspector() {
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148
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149 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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150 String branchName = cset.branch();
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151 if (!branchStart.containsKey(branchName)) {
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152 branchStart.put(branchName, nodeid);
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153 branchHeads.put(branchName, new LinkedList<Nodeid>());
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154 branchHeadCandidates.put(branchName, new LinkedList<Nodeid>());
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155 } else {
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156 final List<Nodeid> headCandidates = branchHeadCandidates.get(branchName);
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157 if (headCandidates.remove(nodeid)) {
309
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158 // 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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159 // however, it's possible the child we found is a result of an earlier fork, and revision in the
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160 // branchLastSeen is 'parallel' head, which needs to be kept
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161 Nodeid lastSeenInBranch = branchLastSeen.get(branchName);
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162 // check if current revision is on descendant line. Seems direct parents check is enough
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163 if (pw.safeFirstParent(nodeid).equals(lastSeenInBranch) || pw.safeSecondParent(nodeid).equals(lastSeenInBranch)) {
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164 branchLastSeen.remove(branchName);
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165 }
236
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166 }
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167 }
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168 List<Nodeid> immediateChildren = pw.directChildren(nodeid);
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169 if (immediateChildren.size() > 0) {
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170 // 1) children may be in another branch
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171 // and unless we later came across another element from this branch,
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172 // we need to record all these as potential heads
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173 //
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174 // 2) head1 with children in different branch, and head2 in this branch without children
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175 branchLastSeen.put(branchName, nodeid);
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176 branchHeadCandidates.get(branchName).addAll(immediateChildren);
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177 } else {
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178 // no more children known for this node, it's (one of the) head of the branch
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179 branchHeads.get(branchName).add(nodeid);
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180 }
236
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181 ps.worked(1);
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182 }
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183 };
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184 repo.getChangelog().range(lastCached == -1 ? 0 : lastCached+1, HgRepository.TIP, insp);
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185 // those last seen revisions from the branch that had no children from the same branch are heads.
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186 for (String bn : branchLastSeen.keySet()) {
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187 // these are inactive branches? - there were children, but not from the same branch?
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188 branchHeads.get(bn).add(branchLastSeen.get(bn));
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189 }
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190 for (String bn : branchStart.keySet()) {
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191 BranchInfo bi = branches.get(bn);
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192 if (bi != null) {
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193 // although heads from cache shall not intersect with heads after lastCached,
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194 // use of LHS doesn't hurt (and makes sense e.g. if cache is not completely correct in my tests)
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195 LinkedHashSet<Nodeid> heads = new LinkedHashSet<Nodeid>(bi.getHeads());
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196 for (Nodeid oldHead : bi.getHeads()) {
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197 // XXX perhaps, need pw.canReach(Nodeid from, Collection<Nodeid> to)
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198 List<Nodeid> newChildren = pw.childrenOf(Collections.singletonList(oldHead));
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199 if (!newChildren.isEmpty()) {
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200 // likely not a head any longer,
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201 // check if any new head can be reached from old one, and, if yes,
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202 // do not consider that old head as head.
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203 for (Nodeid newHead : branchHeads.get(bn)) {
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204 if (newChildren.contains(newHead)) {
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205 heads.remove(oldHead);
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206 break;
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207 }
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208 }
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209 } // else - oldHead still head for the branch
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210 }
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211 heads.addAll(branchHeads.get(bn));
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212 bi = new BranchInfo(bn, bi.getStart(), heads.toArray(new Nodeid[0]));
236
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213 } else {
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214 Nodeid[] heads = branchHeads.get(bn).toArray(new Nodeid[0]);
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215 bi = new BranchInfo(bn, branchStart.get(bn), heads);
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216 }
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217 branches.put(bn, bi);
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218 }
220
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219 }
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220 final HgChangelog clog = repo.getChangelog();
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221 final HgRevisionMap<HgChangelog> rmap = new HgRevisionMap<HgChangelog>(clog).init();
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222 for (BranchInfo bi : branches.values()) {
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223 bi.validate(clog, rmap);
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224 }
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225 repoChangeTracker.touch();
220
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226 ps.done();
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227 }
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228
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229 public List<BranchInfo> getAllBranches() throws HgInvalidControlFileException {
220
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230 return new LinkedList<BranchInfo>(branches.values());
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231
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232 }
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233
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234 public BranchInfo getBranch(String name) throws HgInvalidControlFileException {
220
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235 return branches.get(name);
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236 }
244
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237
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238 /**
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239 * Writes down information about repository branches in a format Mercurial native client can understand.
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240 * Cache file gets overwritten only if it is out of date (i.e. misses some branch information)
354
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241 * @throws IOException if write to cache file failed
423
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242 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
244
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243 */
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244 @Experimental(reason="Usage of cache isn't supposed to be public knowledge")
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245 public void writeCache() throws IOException, HgRuntimeException {
244
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246 if (isCacheActual) {
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247 return;
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248 }
354
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249 File branchheadsCache = getCacheFile();
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250 if (!branchheadsCache.exists()) {
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251 branchheadsCache.getParentFile().mkdirs(); // just in case cache/ doesn't exist jet
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252 branchheadsCache.createNewFile();
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253 }
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254 if (!branchheadsCache.canWrite()) {
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255 return;
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256 }
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257 final HgRepository repo = internalRepo.getRepo();
354
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258 final int lastRev = repo.getChangelog().getLastRevision();
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259 final Nodeid lastNid = repo.getChangelog().getRevision(lastRev);
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260 BufferedWriter bw = new BufferedWriter(new FileWriter(branchheadsCache));
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261 bw.write(lastNid.toString());
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262 bw.write((int) ' ');
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263 bw.write(Integer.toString(lastRev));
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264 bw.write("\n");
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265 for (BranchInfo bi : branches.values()) {
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266 for (Nodeid nid : bi.getHeads()) {
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267 bw.write(nid.toString());
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268 bw.write((int) ' ');
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269 bw.write(bi.getName());
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270 bw.write("\n");
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271 }
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272 }
354
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273 bw.close();
244
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274 }
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275
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276 private File getCacheFile() {
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277 // prior to 1.8 used to be .hg/branchheads.cache
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278 return internalRepo.getFileFromRepoDir("cache/branchheads");
244
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279 }
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280
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281 /*package-local*/ void reloadIfChanged(ProgressSupport ps) throws HgRuntimeException {
610
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282 if (repoChangeTracker.isChanged()) {
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283 collect(ps);
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284 }
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285 }
244
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286
220
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287 public static class BranchInfo {
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288 private final String name;
308
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289 private List<Nodeid> heads;
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290 private boolean closed;
220
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291 private final Nodeid start;
315
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292 private List<Nodeid> closedHeads; // subset of heads, those that bear 'closed' flag, or null if closed == true
220
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293
236
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294 // XXX in fact, few but not all branchHeads might be closed, and isClosed for whole branch is not
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295 // possible to determine.
308
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296 BranchInfo(String branchName, Nodeid first, Nodeid[] branchHeads) {
220
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297 name = branchName;
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298 start = first;
308
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299 heads = Arrays.asList(branchHeads);
220
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300 }
236
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301
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302 // incomplete branch, there's not enough information at the time of creation. shall be replaced with
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303 // proper BI in #collect()
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304 BranchInfo(String branchName, Nodeid[] branchHeads) {
308
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305 this(branchName, Nodeid.NULL, branchHeads);
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306 }
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307
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308 void validate(HgChangelog clog, HgRevisionMap<HgChangelog> rmap) throws HgRuntimeException {
308
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309 int[] localCset = new int[heads.size()];
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310 int i = 0;
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311 for (Nodeid h : heads) {
367
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312 localCset[i++] = rmap.revisionIndex(h);
308
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313 }
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314 // [0] tipmost, [1] tipmost open
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315 final Nodeid[] tipmost = new Nodeid[] {null, null};
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316 final boolean[] allClosed = new boolean[] { true };
315
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317 final ArrayList<Nodeid> _closedHeads = new ArrayList<Nodeid>(heads.size());
308
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318 clog.range(new HgChangelog.Inspector() {
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319
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320 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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321 assert heads.contains(nodeid);
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322 tipmost[0] = nodeid;
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323 if (!"1".equals(cset.extras().get("close"))) {
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324 tipmost[1] = nodeid;
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325 allClosed[0] = false;
315
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326 } else {
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327 _closedHeads.add(nodeid);
308
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328 }
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329 }
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330 }, localCset);
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331 closed = allClosed[0];
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332 Nodeid[] outcome = new Nodeid[localCset.length];
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333 i = 0;
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334 if (!closed && tipmost[1] != null) {
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335 outcome[i++] = tipmost[1];
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336 if (i < outcome.length && !tipmost[0].equals(tipmost[1])) {
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337 outcome[i++] = tipmost[0];
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338 }
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339 } else {
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340 outcome[i++] = tipmost[0];
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341 }
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342 for (Nodeid h : heads) {
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343 if (!h.equals(tipmost[0]) && !h.equals(tipmost[1])) {
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344 outcome[i++] = h;
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345 }
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346 }
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347 heads = Arrays.asList(outcome);
315
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348 if (closed) {
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349 // no need
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350 closedHeads = null;
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351 } else {
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352 _closedHeads.trimToSize();
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353 closedHeads = _closedHeads;
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354 }
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355 }
220
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356
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357 public String getName() {
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358 return name;
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359 }
308
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360 /**
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361 * @return <code>true</code> if all heads of this branch are marked as closed
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362 */
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363 public boolean isClosed() {
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364 return closed;
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365 }
315
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366
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367 /**
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368 * @return all heads for the branch, both open and closed, tip-most head first
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369 */
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370 public List<Nodeid> getHeads() {
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371 return heads;
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372 }
315
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373
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374 /**
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375 *
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376 * @param head one of revision from {@link #getHeads() heads} of this branch
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377 * @return true if this particular head is closed
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378 * @throws IllegalArgumentException if argument is not from {@link #getHeads() heads} of this branch
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379 */
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380 public boolean isClosed(Nodeid head) {
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381 if (!heads.contains(head)) {
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382 throw new IllegalArgumentException(String.format("Revision %s does not belong to heads of %s branch", head, name), null);
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383 }
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384 if (closed) {
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385 return true;
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386 }
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387 return closedHeads.contains(head);
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388 }
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389 // public Nodeid getTip() {
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390 // }
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391 /*public*/ Nodeid getStart() {
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392 // first node where branch appears
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393 return start;
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394 }
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395 }
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396 }