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annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 656:a937e63b6e02

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Performance: rebuild information about branches takes too long (my improvement: 3 times, 11-15 s to less than 4 sec)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 04 Jul 2013 18:40:03 +0200
parents 12a4f60ea972
children 6334b0267103
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 *
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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(), this).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
628
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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) {
432
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133 final HgParentChildMap<HgChangelog> pw = new HgParentChildMap<HgChangelog>(repo.getChangelog());
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134 pw.init();
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135 ps.worked(repo.getChangelog().getRevisionCount());
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136 //
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137 // first revision branch found at
236
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138 final HashMap<String, Nodeid> branchStart = new HashMap<String, Nodeid>();
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139 // revisions from the branch that have no children at all
236
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140 final HashMap<String, List<Nodeid>> branchHeads = new HashMap<String, List<Nodeid>>();
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141 HgChangelog.Inspector insp = new HgChangelog.Inspector() {
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142
656
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143 private final ArrayList<Nodeid> parents = new ArrayList<Nodeid>(3);
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144
236
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145 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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146 String branchName = cset.branch();
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147 List<Nodeid> _branchHeads;
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148 // there are chances (with --force key) branch can get more than one start
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149 // revision. Neither BranchInfo nor this code support this scenario at the moment.
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150 if (!branchStart.containsKey(branchName)) {
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151 branchStart.put(branchName, nodeid);
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152 branchHeads.put(branchName, _branchHeads = new LinkedList<Nodeid>());
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153 } else {
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154 _branchHeads = branchHeads.get(branchName);
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155 if (_branchHeads == null) {
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156 branchHeads.put(branchName, _branchHeads = new LinkedList<Nodeid>());
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157 }
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158 }
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159 // so far present node is the best candidate for head
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160 _branchHeads.add(nodeid);
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161 parents.clear();
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162 // parents of this node, however, cease to be heads (if they are from this branch)
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163 pw.appendParentsOf(nodeid, parents);
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164 _branchHeads.removeAll(parents);
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165 ps.worked(1);
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166 }
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167 };
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168 // XXX alternatively may iterate with pw.all().subList(lastCached)
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169 // but need an effective way to find out branch of particular changeset
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170 repo.getChangelog().range(lastCached == -1 ? 0 : lastCached+1, HgRepository.TIP, insp);
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171 //
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172 // build BranchInfo, based on found and cached
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173 for (String bn : branchStart.keySet()) {
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174 BranchInfo bi = branches.get(bn);
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175 if (bi != null) {
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176 // combine heads found so far with those cached
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177 LinkedHashSet<Nodeid> oldHeads = new LinkedHashSet<Nodeid>(bi.getHeads());
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178 // expect size of both oldHeads and newHeads sets to be small, and for x for hence acceptable.
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179 for (Nodeid newHead : branchHeads.get(bn)) {
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180 for (Iterator<Nodeid> it = oldHeads.iterator(); it.hasNext();) {
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181 if (pw.isChild(it.next(), newHead)) {
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182 it.remove();
309
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183 }
236
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184 }
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185 }
656
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186 oldHeads.addAll(branchHeads.get(bn));
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187 assert oldHeads.size() > 0;
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188 bi = new BranchInfo(bn, bi.getStart(), oldHeads.toArray(new Nodeid[oldHeads.size()]));
236
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189 } else {
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190 Nodeid[] heads = branchHeads.get(bn).toArray(new Nodeid[0]);
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191 bi = new BranchInfo(bn, branchStart.get(bn), heads);
236
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192 }
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193 branches.put(bn, bi);
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194 }
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195 } // !cacheActual
308
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196 final HgChangelog clog = repo.getChangelog();
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197 /// FIXME use HgParentChildMap if available (need to decide how to get HgRevisionMap and HgParentChildMap to a common denominator)
433
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198 final HgRevisionMap<HgChangelog> rmap = new HgRevisionMap<HgChangelog>(clog).init();
308
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199 for (BranchInfo bi : branches.values()) {
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200 bi.validate(clog, rmap);
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201 }
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202 repoChangeTracker.touch();
220
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203 ps.done();
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204 }
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205
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206 public List<BranchInfo> getAllBranches() throws HgInvalidControlFileException {
220
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207 return new LinkedList<BranchInfo>(branches.values());
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208
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209 }
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210
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211 public BranchInfo getBranch(String name) throws HgInvalidControlFileException {
220
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212 return branches.get(name);
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213 }
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214
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215 /**
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216 * Writes down information about repository branches in a format Mercurial native client can understand.
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217 * Cache file gets overwritten only if it is out of date (i.e. misses some branch information)
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218 * @throws IOException if write to cache file failed
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219 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
244
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220 */
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221 @Experimental(reason="Usage of cache isn't supposed to be public knowledge")
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222 public void writeCache() throws IOException, HgRuntimeException {
244
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223 if (isCacheActual) {
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224 return;
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225 }
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226 File branchheadsCache = getCacheFile();
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227 if (!branchheadsCache.exists()) {
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228 branchheadsCache.getParentFile().mkdirs(); // just in case cache/ doesn't exist jet
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229 branchheadsCache.createNewFile();
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230 }
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231 if (!branchheadsCache.canWrite()) {
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232 return;
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233 }
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234 final HgRepository repo = internalRepo.getRepo();
354
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235 final int lastRev = repo.getChangelog().getLastRevision();
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236 final Nodeid lastNid = repo.getChangelog().getRevision(lastRev);
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237 BufferedWriter bw = new BufferedWriter(new FileWriter(branchheadsCache));
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238 bw.write(lastNid.toString());
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239 bw.write((int) ' ');
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240 bw.write(Integer.toString(lastRev));
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241 bw.write("\n");
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242 for (BranchInfo bi : branches.values()) {
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243 for (Nodeid nid : bi.getHeads()) {
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244 bw.write(nid.toString());
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245 bw.write((int) ' ');
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246 bw.write(bi.getName());
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247 bw.write("\n");
244
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248 }
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249 }
354
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250 bw.close();
244
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251 }
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252
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253 private File getCacheFile() {
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254 // prior to 1.8 used to be .hg/branchheads.cache
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255 return internalRepo.getFileFromRepoDir("cache/branchheads");
244
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256 }
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257
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258 /*package-local*/ void reloadIfChanged(ProgressSupport ps) throws HgRuntimeException {
610
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259 if (repoChangeTracker.isChanged()) {
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260 collect(ps);
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261 }
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262 }
244
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263
220
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264 public static class BranchInfo {
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265 private final String name;
308
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266 private List<Nodeid> heads;
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267 private boolean closed;
220
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268 private final Nodeid start;
315
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269 private List<Nodeid> closedHeads; // subset of heads, those that bear 'closed' flag, or null if closed == true
220
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270
236
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271 // XXX in fact, few but not all branchHeads might be closed, and isClosed for whole branch is not
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272 // possible to determine.
308
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273 BranchInfo(String branchName, Nodeid first, Nodeid[] branchHeads) {
220
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274 name = branchName;
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275 start = first;
308
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276 heads = Arrays.asList(branchHeads);
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277 }
236
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278
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279 // incomplete branch, there's not enough information at the time of creation. shall be replaced with
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280 // proper BI in #collect()
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281 BranchInfo(String branchName, Nodeid[] branchHeads) {
308
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282 this(branchName, Nodeid.NULL, branchHeads);
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283 }
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284
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285 void validate(HgChangelog clog, HgRevisionMap<HgChangelog> rmap) throws HgRuntimeException {
308
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286 int[] localCset = new int[heads.size()];
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287 int i = 0;
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288 for (Nodeid h : heads) {
367
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289 localCset[i++] = rmap.revisionIndex(h);
308
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290 }
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291 // [0] tipmost, [1] tipmost open
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292 final Nodeid[] tipmost = new Nodeid[] {null, null};
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293 final boolean[] allClosed = new boolean[] { true };
315
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294 final ArrayList<Nodeid> _closedHeads = new ArrayList<Nodeid>(heads.size());
308
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295 clog.range(new HgChangelog.Inspector() {
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296
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297 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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298 assert heads.contains(nodeid);
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299 tipmost[0] = nodeid;
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300 if (!"1".equals(cset.extras().get("close"))) {
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301 tipmost[1] = nodeid;
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302 allClosed[0] = false;
315
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303 } else {
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304 _closedHeads.add(nodeid);
308
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305 }
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306 }
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307 }, localCset);
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308 closed = allClosed[0];
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309 Nodeid[] outcome = new Nodeid[localCset.length];
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310 i = 0;
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311 if (!closed && tipmost[1] != null) {
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312 outcome[i++] = tipmost[1];
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313 if (i < outcome.length && !tipmost[0].equals(tipmost[1])) {
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314 outcome[i++] = tipmost[0];
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315 }
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316 } else {
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317 outcome[i++] = tipmost[0];
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318 }
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319 for (Nodeid h : heads) {
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320 if (!h.equals(tipmost[0]) && !h.equals(tipmost[1])) {
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321 outcome[i++] = h;
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322 }
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323 }
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324 heads = Arrays.asList(outcome);
315
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325 if (closed) {
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326 // no need
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327 closedHeads = null;
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328 } else {
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329 _closedHeads.trimToSize();
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330 closedHeads = _closedHeads;
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331 }
236
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332 }
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333
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334 public String getName() {
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335 return name;
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336 }
308
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337 /**
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338 * @return <code>true</code> if all heads of this branch are marked as closed
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339 */
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340 public boolean isClosed() {
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341 return closed;
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342 }
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343
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344 /**
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345 * @return all heads for the branch, both open and closed, tip-most head first
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346 */
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347 public List<Nodeid> getHeads() {
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348 return heads;
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349 }
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350
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351 /**
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352 *
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353 * @param head one of revision from {@link #getHeads() heads} of this branch
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354 * @return true if this particular head is closed
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355 * @throws IllegalArgumentException if argument is not from {@link #getHeads() heads} of this branch
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356 */
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357 public boolean isClosed(Nodeid head) {
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358 if (!heads.contains(head)) {
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359 throw new IllegalArgumentException(String.format("Revision %s does not belong to heads of %s branch", head, name), null);
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360 }
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361 if (closed) {
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362 return true;
8952f89be195 Allow to query specific branch heads if they are closed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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363 }
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364 return closedHeads.contains(head);
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365 }
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366 // public Nodeid getTip() {
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367 // }
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a937e63b6e02 Performance: rebuild information about branches takes too long (my improvement: 3 times, 11-15 s to less than 4 sec)
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368 // 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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883300108179 Speed up branches calculation when cached branch information is available
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369 /*public*/ Nodeid getStart() {
220
8de327242aa0 Basic information about branches
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370 // first node where branch appears
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371 return start;
8de327242aa0 Basic information about branches
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372 }
8de327242aa0 Basic information about branches
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373 }
8de327242aa0 Basic information about branches
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374 }