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annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 678:8625cba0a5a8

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Towards better blame of merge revisions: refactor merge handling strategy
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 19 Jul 2013 15:36:29 +0200
parents af5223b86dd3
children
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.HashMap;
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31 import java.util.Iterator;
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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 * Access information about branches in the repository
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50 *
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51 * @author Artem Tikhomirov
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52 * @author TMate Software Ltd.
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53 */
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54 public class HgBranches {
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55
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56 private final Internals internalRepo;
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57 private final ChangelogMonitor repoChangeTracker;
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58 private final Map<String, BranchInfo> branches = new TreeMap<String, BranchInfo>();
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59 private boolean isCacheActual = false;
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60
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61 HgBranches(Internals internals) {
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62 internalRepo = internals;
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63 repoChangeTracker = new ChangelogMonitor(internals.getRepo());
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64 }
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65
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66 private int readCache() {
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67 final HgRepository repo = internalRepo.getRepo();
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68 File branchheadsCache = getCacheFile();
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69 int lastInCache = -1;
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70 if (!branchheadsCache.canRead()) {
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71 return lastInCache;
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72 }
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73 BufferedReader br = null; // TODO replace with LineReader
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74 final Pattern spacePattern = Pattern.compile(" ");
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75 try {
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76 final LinkedHashMap<String, List<Nodeid>> branchHeads = new LinkedHashMap<String, List<Nodeid>>();
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77 br = new BufferedReader(new FileReader(branchheadsCache));
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78 String line = br.readLine();
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79 if (line == null || line.trim().length() == 0) {
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80 return lastInCache;
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81 }
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82 String[] cacheIdentity = spacePattern.split(line.trim());
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83 lastInCache = Integer.parseInt(cacheIdentity[1]);
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84 final int lastKnownRepoRevIndex = repo.getChangelog().getLastRevision();
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85 if (lastInCache > lastKnownRepoRevIndex || !repo.getChangelog().getRevision(lastKnownRepoRevIndex).equals(Nodeid.fromAscii(cacheIdentity[0]))) {
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86 // there are chances cache file got invalid entries due to e.g. rollback operation
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87 return -1;
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88 }
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89 while ((line = br.readLine()) != null) {
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90 String[] elements = spacePattern.split(line.trim());
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91 if (elements.length != 2) {
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92 // bad entry
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93 continue;
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94 }
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95 // I assume split returns substrings of the original string, hence copy of a branch name
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96 String branchName = new String(elements[elements.length-1]);
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97 List<Nodeid> heads = branchHeads.get(elements[1]);
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98 if (heads == null) {
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99 branchHeads.put(branchName, heads = new LinkedList<Nodeid>());
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100 }
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101 heads.add(Nodeid.fromAscii(elements[0]));
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102 }
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103 for (Map.Entry<String, List<Nodeid>> e : branchHeads.entrySet()) {
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104 Nodeid[] heads = e.getValue().toArray(new Nodeid[e.getValue().size()]);
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105 BranchInfo bi = new BranchInfo(e.getKey(), heads);
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106 branches.put(e.getKey(), bi);
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107 }
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108 return lastInCache;
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109 } catch (IOException ex) {
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110 // log error, but otherwise do nothing
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111 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null);
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112 // FALL THROUGH to return -1 indicating no cache information
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113 } catch (NumberFormatException ex) {
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114 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null);
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115 // FALL THROUGH
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116 } catch (HgRuntimeException ex) {
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117 // if happens, log error and pretend there's no cache
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118 repo.getSessionContext().getLog().dump(getClass(), Error, ex, null);
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119 // FALL THROUGH
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120 } finally {
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121 new FileUtils(repo.getSessionContext().getLog(), this).closeQuietly(br);
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122 }
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123 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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124 }
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125
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126 void collect(final ProgressSupport ps) throws HgRuntimeException {
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127 branches.clear();
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128 final HgRepository repo = internalRepo.getRepo();
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129 final HgChangelog clog = repo.getChangelog();
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130 final HgRevisionMap<HgChangelog> rmap;
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131 ps.start(1 + clog.getRevisionCount() * 2);
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132 //
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133 int lastCached = readCache();
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134 isCacheActual = lastCached == clog.getLastRevision();
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135 if (!isCacheActual) {
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136 // XXX need a way to share HgParentChildMap<HgChangelog>
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137 final HgParentChildMap<HgChangelog> pw = new HgParentChildMap<HgChangelog>(clog);
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138 pw.init();
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139 ps.worked(clog.getRevisionCount());
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140 //
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141 // first revision branch found at
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142 final HashMap<String, Nodeid> branchStart = new HashMap<String, Nodeid>();
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143 // revisions from the branch that have no children at all
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144 final HashMap<String, List<Nodeid>> branchHeads = new HashMap<String, List<Nodeid>>();
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145 HgChangelog.Inspector insp = new HgChangelog.Inspector() {
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146
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147 private final ArrayList<Nodeid> parents = new ArrayList<Nodeid>(3);
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148
236
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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 List<Nodeid> _branchHeads;
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152 // there are chances (with --force key) branch can get more than one start
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153 // revision. Neither BranchInfo nor this code support this scenario at the moment.
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154 if (!branchStart.containsKey(branchName)) {
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155 branchStart.put(branchName, nodeid);
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156 branchHeads.put(branchName, _branchHeads = new LinkedList<Nodeid>());
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157 } else {
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158 _branchHeads = branchHeads.get(branchName);
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159 if (_branchHeads == null) {
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160 branchHeads.put(branchName, _branchHeads = new LinkedList<Nodeid>());
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161 }
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162 }
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163 // so far present node is the best candidate for head
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164 _branchHeads.add(nodeid);
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165 parents.clear();
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166 // parents of this node, however, cease to be heads (if they are from this branch)
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167 pw.appendParentsOf(nodeid, parents);
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168 _branchHeads.removeAll(parents);
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169 ps.worked(1);
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170 }
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171 };
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172 // XXX alternatively may iterate with pw.all().subList(lastCached)
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173 // but need an effective way to find out branch of particular changeset
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174 clog.range(lastCached == -1 ? 0 : lastCached+1, HgRepository.TIP, insp);
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175 //
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176 // build BranchInfo, based on found and cached
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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 // combine heads found so far with those cached
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181 LinkedHashSet<Nodeid> oldHeads = new LinkedHashSet<Nodeid>(bi.getHeads());
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182 // expect size of both oldHeads and newHeads sets to be small, and for x for hence acceptable.
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183 for (Nodeid newHead : branchHeads.get(bn)) {
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184 for (Iterator<Nodeid> it = oldHeads.iterator(); it.hasNext();) {
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185 if (pw.isChild(it.next(), newHead)) {
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186 it.remove();
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187 }
236
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188 }
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189 }
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190 oldHeads.addAll(branchHeads.get(bn));
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191 assert oldHeads.size() > 0;
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192 bi = new BranchInfo(bn, bi.getStart(), oldHeads.toArray(new Nodeid[oldHeads.size()]));
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193 } else {
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194 Nodeid[] heads = branchHeads.get(bn).toArray(new Nodeid[0]);
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195 bi = new BranchInfo(bn, branchStart.get(bn), heads);
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196 }
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197 branches.put(bn, bi);
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198 }
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199 rmap = pw.getRevisionMap();
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200 } else { // !cacheActual
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201 rmap = new HgRevisionMap<HgChangelog>(clog).init();
220
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202 }
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203 for (BranchInfo bi : branches.values()) {
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204 bi.validate(clog, rmap);
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205 }
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206 repoChangeTracker.touch();
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207 ps.done();
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208 }
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209
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210 public List<BranchInfo> getAllBranches() throws HgInvalidControlFileException {
220
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211 return new LinkedList<BranchInfo>(branches.values());
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212
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213 }
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214
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215 public BranchInfo getBranch(String name) throws HgInvalidControlFileException {
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216 return branches.get(name);
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217 }
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218
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219 /**
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220 * Writes down information about repository branches in a format Mercurial native client can understand.
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221 * Cache file gets overwritten only if it is out of date (i.e. misses some branch information)
354
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222 * @throws IOException if write to cache file failed
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223 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
244
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224 */
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225 @Experimental(reason="Usage of cache isn't supposed to be public knowledge")
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226 public void writeCache() throws IOException, HgRuntimeException {
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227 if (isCacheActual) {
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228 return;
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229 }
354
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230 File branchheadsCache = getCacheFile();
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231 if (!branchheadsCache.exists()) {
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232 branchheadsCache.getParentFile().mkdirs(); // just in case cache/ doesn't exist jet
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233 branchheadsCache.createNewFile();
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234 }
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235 if (!branchheadsCache.canWrite()) {
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236 return;
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237 }
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238 final HgRepository repo = internalRepo.getRepo();
354
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239 final int lastRev = repo.getChangelog().getLastRevision();
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240 final Nodeid lastNid = repo.getChangelog().getRevision(lastRev);
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241 BufferedWriter bw = new BufferedWriter(new FileWriter(branchheadsCache));
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242 bw.write(lastNid.toString());
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243 bw.write((int) ' ');
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244 bw.write(Integer.toString(lastRev));
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245 bw.write("\n");
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246 for (BranchInfo bi : branches.values()) {
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247 for (Nodeid nid : bi.getHeads()) {
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248 bw.write(nid.toString());
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249 bw.write((int) ' ');
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250 bw.write(bi.getName());
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251 bw.write("\n");
244
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252 }
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253 }
354
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254 bw.close();
244
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255 }
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256
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257 private File getCacheFile() {
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258 // prior to 1.8 used to be .hg/branchheads.cache
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259 // since 2.5 there is filter suffix
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260 File f = internalRepo.getFileFromRepoDir("cache/branchheads-base");
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261 if (f.exists()) {
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262 return f;
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263 }
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264 return internalRepo.getFileFromRepoDir("cache/branchheads");
244
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265 }
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266
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267 /*package-local*/ void reloadIfChanged(ProgressSupport ps) throws HgRuntimeException {
610
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268 if (repoChangeTracker.isChanged()) {
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269 collect(ps);
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270 }
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271 }
244
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272
220
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273 public static class BranchInfo {
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274 private final String name;
308
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275 private List<Nodeid> heads;
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276 private boolean closed;
220
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277 private final Nodeid start;
315
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278 private List<Nodeid> closedHeads; // subset of heads, those that bear 'closed' flag, or null if closed == true
220
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279
236
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280 // XXX in fact, few but not all branchHeads might be closed, and isClosed for whole branch is not
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281 // possible to determine.
308
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282 BranchInfo(String branchName, Nodeid first, Nodeid[] branchHeads) {
220
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283 name = branchName;
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284 start = first;
308
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285 heads = Arrays.asList(branchHeads);
220
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286 }
236
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287
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288 // incomplete branch, there's not enough information at the time of creation. shall be replaced with
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289 // proper BI in #collect()
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290 BranchInfo(String branchName, Nodeid[] branchHeads) {
308
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291 this(branchName, Nodeid.NULL, branchHeads);
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292 }
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293
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294 void validate(HgChangelog clog, HgRevisionMap<HgChangelog> rmap) throws HgRuntimeException {
308
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295 int[] localCset = new int[heads.size()];
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296 int i = 0;
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297 for (Nodeid h : heads) {
367
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298 localCset[i++] = rmap.revisionIndex(h);
308
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299 }
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300 // [0] tipmost, [1] tipmost open
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301 final Nodeid[] tipmost = new Nodeid[] {null, null};
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302 final boolean[] allClosed = new boolean[] { true };
315
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303 final ArrayList<Nodeid> _closedHeads = new ArrayList<Nodeid>(heads.size());
308
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304 clog.range(new HgChangelog.Inspector() {
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305
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306 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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307 assert heads.contains(nodeid);
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308 tipmost[0] = nodeid;
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309 if (!"1".equals(cset.extras().get("close"))) {
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310 tipmost[1] = nodeid;
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311 allClosed[0] = false;
315
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312 } else {
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313 _closedHeads.add(nodeid);
308
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314 }
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315 }
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316 }, localCset);
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317 closed = allClosed[0];
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318 Nodeid[] outcome = new Nodeid[localCset.length];
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319 i = 0;
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320 if (!closed && tipmost[1] != null) {
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321 outcome[i++] = tipmost[1];
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322 if (i < outcome.length && !tipmost[0].equals(tipmost[1])) {
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323 outcome[i++] = tipmost[0];
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324 }
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325 } else {
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326 outcome[i++] = tipmost[0];
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327 }
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328 for (Nodeid h : heads) {
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329 if (!h.equals(tipmost[0]) && !h.equals(tipmost[1])) {
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330 outcome[i++] = h;
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331 }
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332 }
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333 heads = Arrays.asList(outcome);
315
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334 if (closed) {
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335 // no need
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336 closedHeads = null;
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337 } else {
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338 _closedHeads.trimToSize();
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339 closedHeads = _closedHeads;
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340 }
236
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341 }
220
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342
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343 public String getName() {
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344 return name;
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345 }
308
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346 /**
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347 * @return <code>true</code> if all heads of this branch are marked as closed
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348 */
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349 public boolean isClosed() {
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350 return closed;
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351 }
315
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352
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353 /**
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354 * @return all heads for the branch, both open and closed, tip-most head first
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355 */
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356 public List<Nodeid> getHeads() {
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357 return heads;
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358 }
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359
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360 /**
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361 *
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362 * @param head one of revision from {@link #getHeads() heads} of this branch
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363 * @return true if this particular head is closed
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364 * @throws IllegalArgumentException if argument is not from {@link #getHeads() heads} of this branch
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365 */
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366 public boolean isClosed(Nodeid head) {
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367 if (!heads.contains(head)) {
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368 throw new IllegalArgumentException(String.format("Revision %s does not belong to heads of %s branch", head, name), null);
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369 }
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370 if (closed) {
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371 return true;
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372 }
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373 return closedHeads.contains(head);
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374 }
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375 // public Nodeid getTip() {
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376 // }
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377 // XXX Not public as there are chances for few possible branch starts, and I need to decide how to handle that
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378 /*public*/ Nodeid getStart() {
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379 // first node where branch appears
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380 return start;
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381 }
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382 }
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383 }