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annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 309:962f78aac342

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Branch with few children forked shall not ignore other children once one of them is processed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 24 Sep 2011 13:02:48 +0200
parents 3f40262153a4
children 8952f89be195
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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18
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19 import java.io.BufferedReader;
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20 import java.io.BufferedWriter;
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21 import java.io.File;
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22 import java.io.FileReader;
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23 import java.io.FileWriter;
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24 import java.io.IOException;
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25 import java.util.Arrays;
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26 import java.util.Collections;
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27 import java.util.HashMap;
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28 import java.util.LinkedHashMap;
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29 import java.util.LinkedHashSet;
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30 import java.util.LinkedList;
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31 import java.util.List;
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32 import java.util.Map;
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33 import java.util.TreeMap;
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34 import java.util.regex.Pattern;
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36 import org.tmatesoft.hg.core.Nodeid;
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37 import org.tmatesoft.hg.internal.Experimental;
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38 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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39 import org.tmatesoft.hg.util.ProgressSupport;
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41 /**
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class HgBranches {
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47
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48 private final Map<String, BranchInfo> branches = new TreeMap<String, BranchInfo>();
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49 private final HgRepository repo;
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50 private boolean isCacheActual = false;
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51
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52 HgBranches(HgRepository hgRepo) {
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53 repo = hgRepo;
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54 }
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55
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56 private int readCache() {
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57 File branchheadsCache = getCacheFile();
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58 int lastInCache = -1;
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59 if (!branchheadsCache.canRead()) {
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60 return lastInCache;
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61 }
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62 BufferedReader br = null;
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63 final Pattern spacePattern = Pattern.compile(" ");
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64 try {
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65 final LinkedHashMap<String, List<Nodeid>> branchHeads = new LinkedHashMap<String, List<Nodeid>>();
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66 br = new BufferedReader(new FileReader(branchheadsCache));
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67 String line = br.readLine();
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68 if (line == null || line.trim().length() == 0) {
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69 return lastInCache;
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70 }
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71 String[] cacheIdentity = spacePattern.split(line.trim());
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72 lastInCache = Integer.parseInt(cacheIdentity[1]);
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73 // XXX may want to check if nodeid of cset from repo.getChangelog() of lastInCache index match cacheIdentity[0]
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74 //
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75 while ((line = br.readLine()) != null) {
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76 String[] elements = spacePattern.split(line.trim());
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77 if (elements.length != 2) {
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78 // bad entry
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79 continue;
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80 }
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81 // I assume split returns substrings of the original string, hence copy of a branch name
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82 String branchName = new String(elements[elements.length-1]);
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83 List<Nodeid> heads = branchHeads.get(elements[1]);
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84 if (heads == null) {
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85 branchHeads.put(branchName, heads = new LinkedList<Nodeid>());
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86 }
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87 heads.add(Nodeid.fromAscii(elements[0]));
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88 }
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89 for (Map.Entry<String, List<Nodeid>> e : branchHeads.entrySet()) {
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90 Nodeid[] heads = e.getValue().toArray(new Nodeid[e.getValue().size()]);
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91 BranchInfo bi = new BranchInfo(e.getKey(), heads);
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92 branches.put(e.getKey(), bi);
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93 }
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94 return lastInCache;
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95 } catch (IOException ex) {
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96 repo.getContext().getLog().warn(getClass(), ex, null); // log error, but otherwise do nothing
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97 } finally {
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98 if (br != null) {
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99 try {
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100 br.close();
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101 } catch (IOException ex) {
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102 repo.getContext().getLog().info(getClass(), ex, null); // ignore
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103 }
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104 }
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105 }
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106 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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107 }
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108
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109 void collect(final ProgressSupport ps) {
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110 branches.clear();
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111 ps.start(1 + repo.getChangelog().getRevisionCount() * 2);
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112 //
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113 int lastCached = readCache();
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114 /*
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115 * Next code was supposed to fill missing aspects of the BranchInfo, but is too slow
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116 *
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117 if (lastCached != -1 && lastCached <= repo.getChangelog().getLastRevision()) {
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118 LinkedList<BranchInfo> incompleteBranches = new LinkedList<HgBranches.BranchInfo>(branches.values());
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119 for (BranchInfo bi : incompleteBranches) {
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120 LinkedList<Nodeid> closedHeads = new LinkedList<Nodeid>();
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121 for (Nodeid h : bi.getHeads()) {
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122 if ("1".equals(repo.getChangelog().changeset(h).extras().get("close"))) {
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123 closedHeads.add(h);
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124 }
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125 }
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126 HashSet<Nodeid> earliest = new HashSet<Nodeid>(bi.getHeads());
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127 HashSet<Nodeid> visited = new HashSet<Nodeid>();
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128 ArrayList<Nodeid> parents = new ArrayList<Nodeid>(2);
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129 HashSet<Nodeid> candidate = new HashSet<Nodeid>();
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130 do {
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131 candidate.clear();
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132 for (Nodeid e : earliest) {
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133 parents.clear();
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134 if (pw.appendParentsOf(e, parents)) {
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135 // at least one parent
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136 Nodeid p1 = parents.get(0);
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137 if (p1 != null && !visited.contains(p1) && bi.getName().equals(repo.getChangelog().changeset(p1).branch())) {
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138 visited.add(p1);
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139 candidate.add(p1);
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140 }
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141 Nodeid p2 = parents.size() > 1 ? parents.get(1) : null;
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142 if (p2 != null && !visited.contains(p2) && bi.getName().equals(repo.getChangelog().changeset(p2).branch())) {
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143 visited.add(p2);
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144 candidate.add(p2);
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145 }
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146 }
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147 }
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148 if (!candidate.isEmpty()) {
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149 earliest.clear();
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150 earliest.addAll(candidate);
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151 }
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152 } while (!candidate.isEmpty());
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153 // earliest can't be empty, we've started with non-empty heads.
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154 Nodeid first = null;
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155 if (earliest.size() == 1) {
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156 first = earliest.iterator().next();
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157 } else {
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158 int earliestRevNum = Integer.MAX_VALUE;
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159 for (Nodeid e : earliest) {
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160 int x = repo.getChangelog().getLocalRevision(e);
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161 if (x < earliestRevNum) {
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162 earliestRevNum = x;
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163 first = e;
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164 }
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165 }
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166 }
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167 assert first != null;
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168 System.out.println("Updated branch " + bi.getName());
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169 branches.put(bi.getName(), new BranchInfo(bi.getName(), first, bi.getHeads().toArray(new Nodeid[0]), closedHeads.size() == bi.getHeads().size()));
220
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170 }
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171 }
236
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172 */
244
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173 isCacheActual = lastCached == repo.getChangelog().getLastRevision();
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174 if (!isCacheActual) {
236
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175 final HgChangelog.ParentWalker pw = repo.getChangelog().new ParentWalker();
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176 pw.init();
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177 ps.worked(repo.getChangelog().getRevisionCount());
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178 // first revision branch found at
236
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179 final HashMap<String, Nodeid> branchStart = new HashMap<String, Nodeid>();
308
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180 // last revision seen for the branch
236
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181 final HashMap<String, Nodeid> branchLastSeen = new HashMap<String, Nodeid>();
308
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182 // revisions from the branch that have no children at all
236
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183 final HashMap<String, List<Nodeid>> branchHeads = new HashMap<String, List<Nodeid>>();
309
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184 // revisions that are immediate children of a node from a given branch
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185 // after iteration, there are some revisions left in this map (children of a branch last revision
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186 // that doesn't belong to the branch. No use of this now, perhaps can deduce isInactive (e.g.those
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187 // branches that have non-empty candidates are inactive if all their heads are roots for those left)
308
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188 final HashMap<String, List<Nodeid>> branchHeadCandidates = new HashMap<String, List<Nodeid>>();
236
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189 HgChangelog.Inspector insp = new HgChangelog.Inspector() {
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190
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191 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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192 String branchName = cset.branch();
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193 if (!branchStart.containsKey(branchName)) {
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194 branchStart.put(branchName, nodeid);
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195 branchHeads.put(branchName, new LinkedList<Nodeid>());
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196 branchHeadCandidates.put(branchName, new LinkedList<Nodeid>());
236
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197 } else {
308
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198 final List<Nodeid> headCandidates = branchHeadCandidates.get(branchName);
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199 if (headCandidates.remove(nodeid)) {
309
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200 // 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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201 // however, it's possible the child we found is a result of an earlier fork, and revision in the
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202 // branchLastSeen is 'parallel' head, which needs to be kept
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203 Nodeid lastSeenInBranch = branchLastSeen.get(branchName);
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204 // check if current revision is on descendant line. Seems direct parents check is enough
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205 if (pw.safeFirstParent(nodeid).equals(lastSeenInBranch) || pw.safeSecondParent(nodeid).equals(lastSeenInBranch)) {
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206 branchLastSeen.remove(branchName);
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207 }
236
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208 }
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209 }
308
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210 List<Nodeid> immediateChildren = pw.directChildren(nodeid);
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211 if (immediateChildren.size() > 0) {
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212 // 1) children may be in another branch
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213 // and unless we later came across another element from this branch,
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214 // we need to record all these as potential heads
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215 //
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216 // 2) head1 with children in different branch, and head2 in this branch without children
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217 branchLastSeen.put(branchName, nodeid);
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218 branchHeadCandidates.get(branchName).addAll(immediateChildren);
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219 } else {
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220 // no more children known for this node, it's (one of the) head of the branch
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221 branchHeads.get(branchName).add(nodeid);
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222 }
236
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223 ps.worked(1);
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224 }
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225 };
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226 repo.getChangelog().range(lastCached == -1 ? 0 : lastCached+1, HgRepository.TIP, insp);
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227 // those last seen revisions from the branch that had no children from the same branch are heads.
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228 for (String bn : branchLastSeen.keySet()) {
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229 // these are inactive branches? - there were children, but not from the same branch?
236
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230 branchHeads.get(bn).add(branchLastSeen.get(bn));
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231 }
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232 for (String bn : branchStart.keySet()) {
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233 BranchInfo bi = branches.get(bn);
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234 if (bi != null) {
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235 // although heads from cache shall not intersect with heads after lastCached,
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236 // use of LHS doesn't hurt (and makes sense e.g. if cache is not completely correct in my tests)
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237 LinkedHashSet<Nodeid> heads = new LinkedHashSet<Nodeid>(bi.getHeads());
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238 for (Nodeid oldHead : bi.getHeads()) {
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239 // XXX perhaps, need pw.canReach(Nodeid from, Collection<Nodeid> to)
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240 List<Nodeid> newChildren = pw.childrenOf(Collections.singletonList(oldHead));
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241 if (!newChildren.isEmpty()) {
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242 // likely not a head any longer,
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243 // check if any new head can be reached from old one, and, if yes,
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244 // do not consider that old head as head.
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245 for (Nodeid newHead : branchHeads.get(bn)) {
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246 if (newChildren.contains(newHead)) {
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247 heads.remove(oldHead);
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248 break;
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249 }
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250 }
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251 } // else - oldHead still head for the branch
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252 }
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253 heads.addAll(branchHeads.get(bn));
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254 bi = new BranchInfo(bn, bi.getStart(), heads.toArray(new Nodeid[0]));
236
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255 } else {
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256 Nodeid[] heads = branchHeads.get(bn).toArray(new Nodeid[0]);
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257 bi = new BranchInfo(bn, branchStart.get(bn), heads);
236
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258 }
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259 branches.put(bn, bi);
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260 }
220
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261 }
308
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262 final HgChangelog clog = repo.getChangelog();
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263 final HgChangelog.RevisionMap rmap = clog.new RevisionMap().init();
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264 for (BranchInfo bi : branches.values()) {
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265 bi.validate(clog, rmap);
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266 }
220
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267 ps.done();
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268 }
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269
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270 public List<BranchInfo> getAllBranches() {
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271 return new LinkedList<BranchInfo>(branches.values());
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272
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273 }
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274
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275 public BranchInfo getBranch(String name) {
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276 return branches.get(name);
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277 }
244
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278
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279 /**
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280 * Writes down information about repository branches in a format Mercurial native client can understand.
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281 * Cache file gets overwritten only if it is out of date (i.e. misses some branch information)
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282 */
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283 @Experimental(reason="Usage of cache isn't supposed to be public knowledge")
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284 public void writeCache() {
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285 if (isCacheActual) {
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286 return;
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287 }
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288 try {
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289 File branchheadsCache = getCacheFile();
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290 if (!branchheadsCache.exists()) {
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291 branchheadsCache.getParentFile().mkdirs(); // just in case cache/ doesn't exist jet
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292 branchheadsCache.createNewFile();
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293 }
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294 if (!branchheadsCache.canWrite()) {
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295 return;
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296 }
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297 final int lastRev = repo.getChangelog().getLastRevision();
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298 final Nodeid lastNid = repo.getChangelog().getRevision(lastRev);
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299 BufferedWriter bw = new BufferedWriter(new FileWriter(branchheadsCache));
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300 bw.write(lastNid.toString());
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301 bw.write((int) ' ');
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302 bw.write(Integer.toString(lastRev));
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303 bw.write("\n");
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304 for (BranchInfo bi : branches.values()) {
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305 for (Nodeid nid : bi.getHeads()) {
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306 bw.write(nid.toString());
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307 bw.write((int) ' ');
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308 bw.write(bi.getName());
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309 bw.write("\n");
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310 }
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311 }
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312 bw.close();
295
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313 } catch (IOException ex) {
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314 repo.getContext().getLog().error(getClass(), ex, "Error writing branch cache file");
244
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315 }
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316 }
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317
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318 private File getCacheFile() {
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319 // prior to 1.8 used to be .hg/branchheads.cache
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320 return new File(repo.getRepositoryRoot(), "cache/branchheads");
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321 }
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322
220
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323 public static class BranchInfo {
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324 private final String name;
308
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325 private List<Nodeid> heads;
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326 private boolean closed;
220
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327 private final Nodeid start;
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328
236
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329 // XXX in fact, few but not all branchHeads might be closed, and isClosed for whole branch is not
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330 // possible to determine.
308
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331 BranchInfo(String branchName, Nodeid first, Nodeid[] branchHeads) {
220
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332 name = branchName;
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333 start = first;
308
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334 heads = Arrays.asList(branchHeads);
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335 }
236
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336
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337 // incomplete branch, there's not enough information at the time of creation. shall be replaced with
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338 // proper BI in #collect()
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339 BranchInfo(String branchName, Nodeid[] branchHeads) {
308
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340 this(branchName, Nodeid.NULL, branchHeads);
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341 }
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342
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343 void validate(HgChangelog clog, HgChangelog.RevisionMap rmap) {
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344 int[] localCset = new int[heads.size()];
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345 int i = 0;
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346 for (Nodeid h : heads) {
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347 localCset[i++] = rmap.localRevision(h);
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348 }
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349 // [0] tipmost, [1] tipmost open
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350 final Nodeid[] tipmost = new Nodeid[] {null, null};
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351 final boolean[] allClosed = new boolean[] { true };
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352 clog.range(new HgChangelog.Inspector() {
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353
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354 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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355 assert heads.contains(nodeid);
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356 tipmost[0] = nodeid;
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357 if (!"1".equals(cset.extras().get("close"))) {
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358 tipmost[1] = nodeid;
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359 allClosed[0] = false;
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360 }
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361 }
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362 }, localCset);
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363 closed = allClosed[0];
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364 Nodeid[] outcome = new Nodeid[localCset.length];
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365 i = 0;
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366 if (!closed && tipmost[1] != null) {
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367 outcome[i++] = tipmost[1];
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368 if (i < outcome.length && !tipmost[0].equals(tipmost[1])) {
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369 outcome[i++] = tipmost[0];
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370 }
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371 } else {
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372 outcome[i++] = tipmost[0];
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373 }
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374 for (Nodeid h : heads) {
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375 if (!h.equals(tipmost[0]) && !h.equals(tipmost[1])) {
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376 outcome[i++] = h;
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377 }
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378 }
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379 heads = Arrays.asList(outcome);
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380 }
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382 public String getName() {
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383 return name;
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384 }
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385 /**
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386 * @return <code>true</code> if all heads of this branch are marked as closed
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387 */
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388 public boolean isClosed() {
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389 return closed;
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390 }
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391 public List<Nodeid> getHeads() {
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392 return heads;
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393 }
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394 // public Nodeid getTip() {
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395 // }
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396 /*public*/ Nodeid getStart() {
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397 // first node where branch appears
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398 return start;
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399 }
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400 }
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401 }