Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 8952f89be195
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
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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());
308
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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>());
308
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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 }
308
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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]);
308
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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 }