Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 619:868b2ffdcd5c

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Close FIS, not FileChannel, to clear both references to FileDescriptor right away
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 17 May 2013 22:04:23 +0200
parents 5c68567b3645
children 6526d8adbc0f
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.Internals;
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44 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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45 import org.tmatesoft.hg.util.ProgressSupport;
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46
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47 /**
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48 *
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49 * @author Artem Tikhomirov
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50 * @author TMate Software Ltd.
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51 */
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52 public class HgBranches {
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53
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54 private final Internals internalRepo;
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55 private final ChangelogMonitor repoChangeTracker;
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56 private final Map<String, BranchInfo> branches = new TreeMap<String, BranchInfo>();
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57 private boolean isCacheActual = false;
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58
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59 HgBranches(Internals internals) {
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60 internalRepo = internals;
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61 repoChangeTracker = new ChangelogMonitor(internals.getRepo());
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62 }
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63
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64 private int readCache() {
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65 final HgRepository repo = internalRepo.getRepo();
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66 File branchheadsCache = getCacheFile();
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67 int lastInCache = -1;
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68 if (!branchheadsCache.canRead()) {
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69 return lastInCache;
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70 }
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71 BufferedReader br = null;
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72 final Pattern spacePattern = Pattern.compile(" ");
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73 try {
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74 final LinkedHashMap<String, List<Nodeid>> branchHeads = new LinkedHashMap<String, List<Nodeid>>();
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75 br = new BufferedReader(new FileReader(branchheadsCache));
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76 String line = br.readLine();
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77 if (line == null || line.trim().length() == 0) {
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78 return lastInCache;
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79 }
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80 String[] cacheIdentity = spacePattern.split(line.trim());
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81 lastInCache = Integer.parseInt(cacheIdentity[1]);
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82 final int lastKnownRepoRevIndex = repo.getChangelog().getLastRevision();
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83 if (lastInCache > lastKnownRepoRevIndex || !repo.getChangelog().getRevision(lastKnownRepoRevIndex).equals(Nodeid.fromAscii(cacheIdentity[0]))) {
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84 // there are chances cache file got invalid entries due to e.g. rollback operation
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85 return -1;
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86 }
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87 while ((line = br.readLine()) != null) {
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88 String[] elements = spacePattern.split(line.trim());
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89 if (elements.length != 2) {
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90 // bad entry
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91 continue;
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92 }
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93 // I assume split returns substrings of the original string, hence copy of a branch name
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94 String branchName = new String(elements[elements.length-1]);
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95 List<Nodeid> heads = branchHeads.get(elements[1]);
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96 if (heads == null) {
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97 branchHeads.put(branchName, heads = new LinkedList<Nodeid>());
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98 }
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99 heads.add(Nodeid.fromAscii(elements[0]));
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100 }
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101 for (Map.Entry<String, List<Nodeid>> e : branchHeads.entrySet()) {
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102 Nodeid[] heads = e.getValue().toArray(new Nodeid[e.getValue().size()]);
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103 BranchInfo bi = new BranchInfo(e.getKey(), heads);
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104 branches.put(e.getKey(), bi);
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105 }
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106 return lastInCache;
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107 } catch (IOException ex) {
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108 // log error, but otherwise do nothing
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109 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null);
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110 // FALL THROUGH to return -1 indicating no cache information
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111 } catch (NumberFormatException ex) {
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112 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null);
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113 // FALL THROUGH
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114 } catch (HgInvalidControlFileException ex) {
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115 // shall not happen, thus log as error
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116 repo.getSessionContext().getLog().dump(getClass(), Error, ex, null);
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117 // FALL THROUGH
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118 } catch (HgInvalidRevisionException ex) {
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119 repo.getSessionContext().getLog().dump(getClass(), Error, ex, null);
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120 // FALL THROUGH
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121 } finally {
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122 if (br != null) {
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123 try {
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124 br.close();
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125 } catch (IOException ex) {
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126 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null); // ignore
236
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127 }
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128 }
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129 }
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130 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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131 }
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132
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133 void collect(final ProgressSupport ps) throws HgInvalidControlFileException {
236
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134 branches.clear();
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135 final HgRepository repo = internalRepo.getRepo();
220
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136 ps.start(1 + repo.getChangelog().getRevisionCount() * 2);
236
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137 //
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138 int lastCached = readCache();
244
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139 isCacheActual = lastCached == repo.getChangelog().getLastRevision();
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140 if (!isCacheActual) {
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141 final HgParentChildMap<HgChangelog> pw = new HgParentChildMap<HgChangelog>(repo.getChangelog());
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142 pw.init();
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143 ps.worked(repo.getChangelog().getRevisionCount());
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144 // first revision branch found at
236
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145 final HashMap<String, Nodeid> branchStart = new HashMap<String, Nodeid>();
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146 // last revision seen for the branch
236
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147 final HashMap<String, Nodeid> branchLastSeen = new HashMap<String, Nodeid>();
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148 // revisions from the branch that have no children at all
236
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149 final HashMap<String, List<Nodeid>> branchHeads = new HashMap<String, List<Nodeid>>();
309
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150 // revisions that are immediate children of a node from a given branch
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151 // after iteration, there are some revisions left in this map (children of a branch last revision
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152 // that doesn't belong to the branch. No use of this now, perhaps can deduce isInactive (e.g.those
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153 // branches that have non-empty candidates are inactive if all their heads are roots for those left)
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154 final HashMap<String, List<Nodeid>> branchHeadCandidates = new HashMap<String, List<Nodeid>>();
236
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155 HgChangelog.Inspector insp = new HgChangelog.Inspector() {
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156
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157 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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158 String branchName = cset.branch();
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159 if (!branchStart.containsKey(branchName)) {
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160 branchStart.put(branchName, nodeid);
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161 branchHeads.put(branchName, new LinkedList<Nodeid>());
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162 branchHeadCandidates.put(branchName, new LinkedList<Nodeid>());
236
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163 } else {
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164 final List<Nodeid> headCandidates = branchHeadCandidates.get(branchName);
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165 if (headCandidates.remove(nodeid)) {
309
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166 // 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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167 // however, it's possible the child we found is a result of an earlier fork, and revision in the
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168 // branchLastSeen is 'parallel' head, which needs to be kept
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169 Nodeid lastSeenInBranch = branchLastSeen.get(branchName);
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170 // check if current revision is on descendant line. Seems direct parents check is enough
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171 if (pw.safeFirstParent(nodeid).equals(lastSeenInBranch) || pw.safeSecondParent(nodeid).equals(lastSeenInBranch)) {
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172 branchLastSeen.remove(branchName);
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173 }
236
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174 }
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175 }
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176 List<Nodeid> immediateChildren = pw.directChildren(nodeid);
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177 if (immediateChildren.size() > 0) {
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178 // 1) children may be in another branch
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179 // and unless we later came across another element from this branch,
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180 // we need to record all these as potential heads
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181 //
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182 // 2) head1 with children in different branch, and head2 in this branch without children
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183 branchLastSeen.put(branchName, nodeid);
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184 branchHeadCandidates.get(branchName).addAll(immediateChildren);
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185 } else {
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186 // no more children known for this node, it's (one of the) head of the branch
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187 branchHeads.get(branchName).add(nodeid);
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188 }
236
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189 ps.worked(1);
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190 }
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191 };
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192 repo.getChangelog().range(lastCached == -1 ? 0 : lastCached+1, HgRepository.TIP, insp);
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193 // those last seen revisions from the branch that had no children from the same branch are heads.
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194 for (String bn : branchLastSeen.keySet()) {
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195 // these are inactive branches? - there were children, but not from the same branch?
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196 branchHeads.get(bn).add(branchLastSeen.get(bn));
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197 }
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198 for (String bn : branchStart.keySet()) {
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199 BranchInfo bi = branches.get(bn);
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200 if (bi != null) {
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201 // although heads from cache shall not intersect with heads after lastCached,
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202 // use of LHS doesn't hurt (and makes sense e.g. if cache is not completely correct in my tests)
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203 LinkedHashSet<Nodeid> heads = new LinkedHashSet<Nodeid>(bi.getHeads());
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204 for (Nodeid oldHead : bi.getHeads()) {
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205 // XXX perhaps, need pw.canReach(Nodeid from, Collection<Nodeid> to)
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206 List<Nodeid> newChildren = pw.childrenOf(Collections.singletonList(oldHead));
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207 if (!newChildren.isEmpty()) {
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208 // likely not a head any longer,
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209 // check if any new head can be reached from old one, and, if yes,
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210 // do not consider that old head as head.
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211 for (Nodeid newHead : branchHeads.get(bn)) {
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212 if (newChildren.contains(newHead)) {
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213 heads.remove(oldHead);
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214 break;
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215 }
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216 }
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217 } // else - oldHead still head for the branch
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218 }
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219 heads.addAll(branchHeads.get(bn));
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220 bi = new BranchInfo(bn, bi.getStart(), heads.toArray(new Nodeid[0]));
236
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221 } else {
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222 Nodeid[] heads = branchHeads.get(bn).toArray(new Nodeid[0]);
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223 bi = new BranchInfo(bn, branchStart.get(bn), heads);
236
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224 }
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225 branches.put(bn, bi);
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226 }
220
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227 }
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228 final HgChangelog clog = repo.getChangelog();
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229 final HgRevisionMap<HgChangelog> rmap = new HgRevisionMap<HgChangelog>(clog).init();
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230 for (BranchInfo bi : branches.values()) {
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231 bi.validate(clog, rmap);
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232 }
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233 repoChangeTracker.touch();
220
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234 ps.done();
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235 }
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236
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237 public List<BranchInfo> getAllBranches() throws HgInvalidControlFileException {
220
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238 return new LinkedList<BranchInfo>(branches.values());
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239
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240 }
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241
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242 public BranchInfo getBranch(String name) throws HgInvalidControlFileException {
220
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243 return branches.get(name);
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244 }
244
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245
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246 /**
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247 * Writes down information about repository branches in a format Mercurial native client can understand.
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248 * Cache file gets overwritten only if it is out of date (i.e. misses some branch information)
354
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249 * @throws IOException if write to cache file failed
423
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250 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
244
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251 */
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252 @Experimental(reason="Usage of cache isn't supposed to be public knowledge")
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253 public void writeCache() throws IOException, HgRuntimeException {
244
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254 if (isCacheActual) {
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255 return;
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256 }
354
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257 File branchheadsCache = getCacheFile();
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258 if (!branchheadsCache.exists()) {
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259 branchheadsCache.getParentFile().mkdirs(); // just in case cache/ doesn't exist jet
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260 branchheadsCache.createNewFile();
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261 }
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262 if (!branchheadsCache.canWrite()) {
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263 return;
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264 }
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265 final HgRepository repo = internalRepo.getRepo();
354
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266 final int lastRev = repo.getChangelog().getLastRevision();
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267 final Nodeid lastNid = repo.getChangelog().getRevision(lastRev);
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268 BufferedWriter bw = new BufferedWriter(new FileWriter(branchheadsCache));
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269 bw.write(lastNid.toString());
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270 bw.write((int) ' ');
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271 bw.write(Integer.toString(lastRev));
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272 bw.write("\n");
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273 for (BranchInfo bi : branches.values()) {
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274 for (Nodeid nid : bi.getHeads()) {
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275 bw.write(nid.toString());
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276 bw.write((int) ' ');
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277 bw.write(bi.getName());
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278 bw.write("\n");
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279 }
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280 }
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281 bw.close();
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282 }
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283
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284 private File getCacheFile() {
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285 // prior to 1.8 used to be .hg/branchheads.cache
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286 return internalRepo.getFileFromRepoDir("cache/branchheads");
244
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287 }
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288
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289 /*package-local*/ void reloadIfChanged(ProgressSupport ps) throws HgInvalidControlFileException {
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290 if (repoChangeTracker.isChanged()) {
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291 collect(ps);
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292 }
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293 }
244
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294
220
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295 public static class BranchInfo {
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296 private final String name;
308
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297 private List<Nodeid> heads;
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298 private boolean closed;
220
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299 private final Nodeid start;
315
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300 private List<Nodeid> closedHeads; // subset of heads, those that bear 'closed' flag, or null if closed == true
220
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301
236
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302 // XXX in fact, few but not all branchHeads might be closed, and isClosed for whole branch is not
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303 // possible to determine.
308
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304 BranchInfo(String branchName, Nodeid first, Nodeid[] branchHeads) {
220
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305 name = branchName;
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306 start = first;
308
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307 heads = Arrays.asList(branchHeads);
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308 }
236
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309
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310 // incomplete branch, there's not enough information at the time of creation. shall be replaced with
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311 // proper BI in #collect()
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312 BranchInfo(String branchName, Nodeid[] branchHeads) {
308
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313 this(branchName, Nodeid.NULL, branchHeads);
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314 }
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315
433
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316 void validate(HgChangelog clog, HgRevisionMap<HgChangelog> rmap) throws HgInvalidControlFileException {
308
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317 int[] localCset = new int[heads.size()];
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318 int i = 0;
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319 for (Nodeid h : heads) {
367
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320 localCset[i++] = rmap.revisionIndex(h);
308
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321 }
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322 // [0] tipmost, [1] tipmost open
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323 final Nodeid[] tipmost = new Nodeid[] {null, null};
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324 final boolean[] allClosed = new boolean[] { true };
315
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325 final ArrayList<Nodeid> _closedHeads = new ArrayList<Nodeid>(heads.size());
308
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326 clog.range(new HgChangelog.Inspector() {
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327
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328 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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329 assert heads.contains(nodeid);
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330 tipmost[0] = nodeid;
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331 if (!"1".equals(cset.extras().get("close"))) {
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332 tipmost[1] = nodeid;
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333 allClosed[0] = false;
315
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334 } else {
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335 _closedHeads.add(nodeid);
308
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336 }
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337 }
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338 }, localCset);
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339 closed = allClosed[0];
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340 Nodeid[] outcome = new Nodeid[localCset.length];
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341 i = 0;
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342 if (!closed && tipmost[1] != null) {
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343 outcome[i++] = tipmost[1];
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344 if (i < outcome.length && !tipmost[0].equals(tipmost[1])) {
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345 outcome[i++] = tipmost[0];
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346 }
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347 } else {
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348 outcome[i++] = tipmost[0];
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349 }
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350 for (Nodeid h : heads) {
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351 if (!h.equals(tipmost[0]) && !h.equals(tipmost[1])) {
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352 outcome[i++] = h;
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353 }
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354 }
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355 heads = Arrays.asList(outcome);
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356 if (closed) {
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357 // no need
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358 closedHeads = null;
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359 } else {
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360 _closedHeads.trimToSize();
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361 closedHeads = _closedHeads;
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362 }
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363 }
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364
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365 public String getName() {
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366 return name;
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367 }
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368 /**
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369 * @return <code>true</code> if all heads of this branch are marked as closed
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370 */
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371 public boolean isClosed() {
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372 return closed;
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373 }
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374
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375 /**
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376 * @return all heads for the branch, both open and closed, tip-most head first
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377 */
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378 public List<Nodeid> getHeads() {
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379 return heads;
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380 }
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381
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382 /**
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383 *
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384 * @param head one of revision from {@link #getHeads() heads} of this branch
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385 * @return true if this particular head is closed
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386 * @throws IllegalArgumentException if argument is not from {@link #getHeads() heads} of this branch
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387 */
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388 public boolean isClosed(Nodeid head) {
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389 if (!heads.contains(head)) {
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390 throw new IllegalArgumentException(String.format("Revision %s does not belong to heads of %s branch", head, name), null);
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391 }
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392 if (closed) {
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393 return true;
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394 }
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395 return closedHeads.contains(head);
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396 }
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397 // public Nodeid getTip() {
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398 // }
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399 /*public*/ Nodeid getStart() {
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400 // first node where branch appears
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401 return start;
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402 }
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403 }
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404 }