Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 315:8952f89be195

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Allow to query specific branch heads if they are closed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 28 Sep 2011 12:18:21 +0200
parents 962f78aac342
children a54bfe0db959
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
8de327242aa0 Basic information about branches
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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.ArrayList;
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26 import java.util.Arrays;
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27 import java.util.Collections;
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28 import java.util.HashMap;
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29 import java.util.LinkedHashMap;
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30 import java.util.LinkedHashSet;
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31 import java.util.LinkedList;
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32 import java.util.List;
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33 import java.util.Map;
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34 import java.util.TreeMap;
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35 import java.util.regex.Pattern;
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36
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37 import org.tmatesoft.hg.core.Nodeid;
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38 import org.tmatesoft.hg.internal.Experimental;
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39 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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40 import org.tmatesoft.hg.util.ProgressSupport;
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41
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42 /**
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43 *
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44 * @author Artem Tikhomirov
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45 * @author TMate Software Ltd.
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46 */
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47 public class HgBranches {
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48
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49 private final Map<String, BranchInfo> branches = new TreeMap<String, BranchInfo>();
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50 private final HgRepository repo;
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51 private boolean isCacheActual = false;
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52
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53 HgBranches(HgRepository hgRepo) {
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54 repo = hgRepo;
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55 }
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56
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57 private int readCache() {
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58 File branchheadsCache = getCacheFile();
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59 int lastInCache = -1;
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60 if (!branchheadsCache.canRead()) {
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61 return lastInCache;
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62 }
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63 BufferedReader br = null;
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64 final Pattern spacePattern = Pattern.compile(" ");
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65 try {
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66 final LinkedHashMap<String, List<Nodeid>> branchHeads = new LinkedHashMap<String, List<Nodeid>>();
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67 br = new BufferedReader(new FileReader(branchheadsCache));
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68 String line = br.readLine();
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69 if (line == null || line.trim().length() == 0) {
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70 return lastInCache;
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71 }
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72 String[] cacheIdentity = spacePattern.split(line.trim());
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73 lastInCache = Integer.parseInt(cacheIdentity[1]);
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74 // XXX may want to check if nodeid of cset from repo.getChangelog() of lastInCache index match cacheIdentity[0]
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75 //
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76 while ((line = br.readLine()) != null) {
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77 String[] elements = spacePattern.split(line.trim());
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78 if (elements.length != 2) {
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79 // bad entry
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80 continue;
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81 }
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82 // I assume split returns substrings of the original string, hence copy of a branch name
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83 String branchName = new String(elements[elements.length-1]);
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84 List<Nodeid> heads = branchHeads.get(elements[1]);
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85 if (heads == null) {
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86 branchHeads.put(branchName, heads = new LinkedList<Nodeid>());
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87 }
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88 heads.add(Nodeid.fromAscii(elements[0]));
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89 }
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90 for (Map.Entry<String, List<Nodeid>> e : branchHeads.entrySet()) {
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91 Nodeid[] heads = e.getValue().toArray(new Nodeid[e.getValue().size()]);
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92 BranchInfo bi = new BranchInfo(e.getKey(), heads);
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93 branches.put(e.getKey(), bi);
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94 }
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95 return lastInCache;
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96 } catch (IOException ex) {
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97 repo.getContext().getLog().warn(getClass(), ex, null); // log error, but otherwise do nothing
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98 } finally {
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99 if (br != null) {
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100 try {
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101 br.close();
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102 } catch (IOException ex) {
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103 repo.getContext().getLog().info(getClass(), ex, null); // ignore
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104 }
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105 }
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106 }
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107 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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108 }
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109
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110 void collect(final ProgressSupport ps) {
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111 branches.clear();
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112 ps.start(1 + repo.getChangelog().getRevisionCount() * 2);
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113 //
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114 int lastCached = readCache();
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115 /*
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116 * Next code was supposed to fill missing aspects of the BranchInfo, but is too slow
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117 *
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118 if (lastCached != -1 && lastCached <= repo.getChangelog().getLastRevision()) {
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119 LinkedList<BranchInfo> incompleteBranches = new LinkedList<HgBranches.BranchInfo>(branches.values());
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120 for (BranchInfo bi : incompleteBranches) {
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121 LinkedList<Nodeid> closedHeads = new LinkedList<Nodeid>();
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122 for (Nodeid h : bi.getHeads()) {
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123 if ("1".equals(repo.getChangelog().changeset(h).extras().get("close"))) {
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124 closedHeads.add(h);
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125 }
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126 }
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127 HashSet<Nodeid> earliest = new HashSet<Nodeid>(bi.getHeads());
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128 HashSet<Nodeid> visited = new HashSet<Nodeid>();
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129 ArrayList<Nodeid> parents = new ArrayList<Nodeid>(2);
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130 HashSet<Nodeid> candidate = new HashSet<Nodeid>();
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131 do {
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132 candidate.clear();
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133 for (Nodeid e : earliest) {
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134 parents.clear();
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135 if (pw.appendParentsOf(e, parents)) {
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136 // at least one parent
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137 Nodeid p1 = parents.get(0);
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138 if (p1 != null && !visited.contains(p1) && bi.getName().equals(repo.getChangelog().changeset(p1).branch())) {
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139 visited.add(p1);
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140 candidate.add(p1);
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141 }
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142 Nodeid p2 = parents.size() > 1 ? parents.get(1) : null;
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143 if (p2 != null && !visited.contains(p2) && bi.getName().equals(repo.getChangelog().changeset(p2).branch())) {
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144 visited.add(p2);
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145 candidate.add(p2);
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146 }
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147 }
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148 }
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149 if (!candidate.isEmpty()) {
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150 earliest.clear();
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151 earliest.addAll(candidate);
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152 }
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153 } while (!candidate.isEmpty());
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154 // earliest can't be empty, we've started with non-empty heads.
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155 Nodeid first = null;
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156 if (earliest.size() == 1) {
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157 first = earliest.iterator().next();
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158 } else {
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159 int earliestRevNum = Integer.MAX_VALUE;
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160 for (Nodeid e : earliest) {
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161 int x = repo.getChangelog().getLocalRevision(e);
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162 if (x < earliestRevNum) {
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163 earliestRevNum = x;
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164 first = e;
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165 }
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166 }
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167 }
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168 assert first != null;
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169 System.out.println("Updated branch " + bi.getName());
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170 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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171 }
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172 }
236
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173 */
244
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174 isCacheActual = lastCached == repo.getChangelog().getLastRevision();
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175 if (!isCacheActual) {
236
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176 final HgChangelog.ParentWalker pw = repo.getChangelog().new ParentWalker();
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177 pw.init();
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178 ps.worked(repo.getChangelog().getRevisionCount());
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179 // first revision branch found at
236
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180 final HashMap<String, Nodeid> branchStart = new HashMap<String, Nodeid>();
308
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181 // last revision seen for the branch
236
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182 final HashMap<String, Nodeid> branchLastSeen = new HashMap<String, Nodeid>();
308
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183 // revisions from the branch that have no children at all
236
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184 final HashMap<String, List<Nodeid>> branchHeads = new HashMap<String, List<Nodeid>>();
309
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185 // revisions that are immediate children of a node from a given branch
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186 // after iteration, there are some revisions left in this map (children of a branch last revision
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187 // that doesn't belong to the branch. No use of this now, perhaps can deduce isInactive (e.g.those
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188 // branches that have non-empty candidates are inactive if all their heads are roots for those left)
308
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189 final HashMap<String, List<Nodeid>> branchHeadCandidates = new HashMap<String, List<Nodeid>>();
236
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190 HgChangelog.Inspector insp = new HgChangelog.Inspector() {
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191
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192 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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193 String branchName = cset.branch();
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194 if (!branchStart.containsKey(branchName)) {
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195 branchStart.put(branchName, nodeid);
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196 branchHeads.put(branchName, new LinkedList<Nodeid>());
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197 branchHeadCandidates.put(branchName, new LinkedList<Nodeid>());
236
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198 } else {
308
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199 final List<Nodeid> headCandidates = branchHeadCandidates.get(branchName);
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200 if (headCandidates.remove(nodeid)) {
309
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201 // 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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202 // however, it's possible the child we found is a result of an earlier fork, and revision in the
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203 // branchLastSeen is 'parallel' head, which needs to be kept
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204 Nodeid lastSeenInBranch = branchLastSeen.get(branchName);
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205 // check if current revision is on descendant line. Seems direct parents check is enough
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206 if (pw.safeFirstParent(nodeid).equals(lastSeenInBranch) || pw.safeSecondParent(nodeid).equals(lastSeenInBranch)) {
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207 branchLastSeen.remove(branchName);
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208 }
236
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209 }
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210 }
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211 List<Nodeid> immediateChildren = pw.directChildren(nodeid);
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212 if (immediateChildren.size() > 0) {
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213 // 1) children may be in another branch
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214 // and unless we later came across another element from this branch,
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215 // we need to record all these as potential heads
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216 //
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217 // 2) head1 with children in different branch, and head2 in this branch without children
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218 branchLastSeen.put(branchName, nodeid);
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219 branchHeadCandidates.get(branchName).addAll(immediateChildren);
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220 } else {
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221 // no more children known for this node, it's (one of the) head of the branch
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222 branchHeads.get(branchName).add(nodeid);
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223 }
236
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224 ps.worked(1);
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225 }
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226 };
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227 repo.getChangelog().range(lastCached == -1 ? 0 : lastCached+1, HgRepository.TIP, insp);
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228 // those last seen revisions from the branch that had no children from the same branch are heads.
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229 for (String bn : branchLastSeen.keySet()) {
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230 // these are inactive branches? - there were children, but not from the same branch?
236
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231 branchHeads.get(bn).add(branchLastSeen.get(bn));
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232 }
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233 for (String bn : branchStart.keySet()) {
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234 BranchInfo bi = branches.get(bn);
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235 if (bi != null) {
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236 // although heads from cache shall not intersect with heads after lastCached,
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237 // use of LHS doesn't hurt (and makes sense e.g. if cache is not completely correct in my tests)
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238 LinkedHashSet<Nodeid> heads = new LinkedHashSet<Nodeid>(bi.getHeads());
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239 for (Nodeid oldHead : bi.getHeads()) {
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240 // XXX perhaps, need pw.canReach(Nodeid from, Collection<Nodeid> to)
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241 List<Nodeid> newChildren = pw.childrenOf(Collections.singletonList(oldHead));
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242 if (!newChildren.isEmpty()) {
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243 // likely not a head any longer,
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244 // check if any new head can be reached from old one, and, if yes,
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245 // do not consider that old head as head.
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246 for (Nodeid newHead : branchHeads.get(bn)) {
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247 if (newChildren.contains(newHead)) {
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248 heads.remove(oldHead);
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249 break;
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250 }
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251 }
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252 } // else - oldHead still head for the branch
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253 }
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254 heads.addAll(branchHeads.get(bn));
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255 bi = new BranchInfo(bn, bi.getStart(), heads.toArray(new Nodeid[0]));
236
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256 } else {
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257 Nodeid[] heads = branchHeads.get(bn).toArray(new Nodeid[0]);
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258 bi = new BranchInfo(bn, branchStart.get(bn), heads);
236
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259 }
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260 branches.put(bn, bi);
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261 }
220
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262 }
308
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263 final HgChangelog clog = repo.getChangelog();
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264 final HgChangelog.RevisionMap rmap = clog.new RevisionMap().init();
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265 for (BranchInfo bi : branches.values()) {
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266 bi.validate(clog, rmap);
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267 }
220
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268 ps.done();
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269 }
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270
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271 public List<BranchInfo> getAllBranches() {
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272 return new LinkedList<BranchInfo>(branches.values());
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273
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274 }
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275
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276 public BranchInfo getBranch(String name) {
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277 return branches.get(name);
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278 }
244
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279
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280 /**
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281 * Writes down information about repository branches in a format Mercurial native client can understand.
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282 * Cache file gets overwritten only if it is out of date (i.e. misses some branch information)
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283 */
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284 @Experimental(reason="Usage of cache isn't supposed to be public knowledge")
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285 public void writeCache() {
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286 if (isCacheActual) {
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287 return;
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288 }
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289 try {
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290 File branchheadsCache = getCacheFile();
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291 if (!branchheadsCache.exists()) {
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292 branchheadsCache.getParentFile().mkdirs(); // just in case cache/ doesn't exist jet
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293 branchheadsCache.createNewFile();
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294 }
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295 if (!branchheadsCache.canWrite()) {
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296 return;
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297 }
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298 final int lastRev = repo.getChangelog().getLastRevision();
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299 final Nodeid lastNid = repo.getChangelog().getRevision(lastRev);
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300 BufferedWriter bw = new BufferedWriter(new FileWriter(branchheadsCache));
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301 bw.write(lastNid.toString());
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302 bw.write((int) ' ');
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303 bw.write(Integer.toString(lastRev));
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304 bw.write("\n");
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305 for (BranchInfo bi : branches.values()) {
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306 for (Nodeid nid : bi.getHeads()) {
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307 bw.write(nid.toString());
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308 bw.write((int) ' ');
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309 bw.write(bi.getName());
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310 bw.write("\n");
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311 }
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312 }
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313 bw.close();
295
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314 } catch (IOException ex) {
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315 repo.getContext().getLog().error(getClass(), ex, "Error writing branch cache file");
244
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316 }
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317 }
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318
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319 private File getCacheFile() {
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320 // prior to 1.8 used to be .hg/branchheads.cache
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321 return new File(repo.getRepositoryRoot(), "cache/branchheads");
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322 }
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323
220
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324 public static class BranchInfo {
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325 private final String name;
308
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326 private List<Nodeid> heads;
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327 private boolean closed;
220
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328 private final Nodeid start;
315
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329 private List<Nodeid> closedHeads; // subset of heads, those that bear 'closed' flag, or null if closed == true
220
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330
236
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331 // XXX in fact, few but not all branchHeads might be closed, and isClosed for whole branch is not
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332 // possible to determine.
308
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333 BranchInfo(String branchName, Nodeid first, Nodeid[] branchHeads) {
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334 name = branchName;
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335 start = first;
308
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336 heads = Arrays.asList(branchHeads);
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337 }
236
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338
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339 // incomplete branch, there's not enough information at the time of creation. shall be replaced with
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340 // proper BI in #collect()
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341 BranchInfo(String branchName, Nodeid[] branchHeads) {
308
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342 this(branchName, Nodeid.NULL, branchHeads);
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343 }
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344
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345 void validate(HgChangelog clog, HgChangelog.RevisionMap rmap) {
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346 int[] localCset = new int[heads.size()];
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347 int i = 0;
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348 for (Nodeid h : heads) {
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349 localCset[i++] = rmap.localRevision(h);
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350 }
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351 // [0] tipmost, [1] tipmost open
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352 final Nodeid[] tipmost = new Nodeid[] {null, null};
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353 final boolean[] allClosed = new boolean[] { true };
315
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354 final ArrayList<Nodeid> _closedHeads = new ArrayList<Nodeid>(heads.size());
308
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355 clog.range(new HgChangelog.Inspector() {
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356
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357 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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358 assert heads.contains(nodeid);
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359 tipmost[0] = nodeid;
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360 if (!"1".equals(cset.extras().get("close"))) {
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361 tipmost[1] = nodeid;
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362 allClosed[0] = false;
315
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363 } else {
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364 _closedHeads.add(nodeid);
308
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365 }
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366 }
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367 }, localCset);
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368 closed = allClosed[0];
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369 Nodeid[] outcome = new Nodeid[localCset.length];
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370 i = 0;
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371 if (!closed && tipmost[1] != null) {
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372 outcome[i++] = tipmost[1];
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373 if (i < outcome.length && !tipmost[0].equals(tipmost[1])) {
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374 outcome[i++] = tipmost[0];
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375 }
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376 } else {
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377 outcome[i++] = tipmost[0];
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378 }
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379 for (Nodeid h : heads) {
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380 if (!h.equals(tipmost[0]) && !h.equals(tipmost[1])) {
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381 outcome[i++] = h;
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382 }
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383 }
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384 heads = Arrays.asList(outcome);
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385 if (closed) {
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386 // no need
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387 closedHeads = null;
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388 } else {
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389 _closedHeads.trimToSize();
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390 closedHeads = _closedHeads;
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391 }
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392 }
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393
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394 public String getName() {
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395 return name;
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396 }
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397 /**
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398 * @return <code>true</code> if all heads of this branch are marked as closed
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399 */
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400 public boolean isClosed() {
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401 return closed;
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402 }
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403
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404 /**
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405 * @return all heads for the branch, both open and closed, tip-most head first
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406 */
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407 public List<Nodeid> getHeads() {
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408 return heads;
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409 }
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410
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411 /**
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412 *
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413 * @param head one of revision from {@link #getHeads() heads} of this branch
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414 * @return true if this particular head is closed
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415 * @throws IllegalArgumentException if argument is not from {@link #getHeads() heads} of this branch
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416 */
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417 public boolean isClosed(Nodeid head) {
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418 if (!heads.contains(head)) {
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419 throw new IllegalArgumentException(String.format("Revision %s does not belong to heads of %s branch", head, name), null);
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420 }
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421 if (closed) {
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422 return true;
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423 }
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424 return closedHeads.contains(head);
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425 }
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426 // public Nodeid getTip() {
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427 // }
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428 /*public*/ Nodeid getStart() {
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429 // first node where branch appears
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430 return start;
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431 }
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432 }
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433 }