Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 370:a2341e761609

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Let callback implementations deliver errors (e,g. own exceptions) to client code
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Dec 2011 02:37:10 +0300
parents 2fadf8695f8a
children 9c9c442b5f2e
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.HgException;
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38 import org.tmatesoft.hg.core.HgInvalidControlFileException;
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39 import org.tmatesoft.hg.core.HgInvalidRevisionException;
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40 import org.tmatesoft.hg.core.Nodeid;
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41 import org.tmatesoft.hg.internal.Experimental;
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42 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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43 import org.tmatesoft.hg.util.ProgressSupport;
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44
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45 /**
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46 *
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47 * @author Artem Tikhomirov
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48 * @author TMate Software Ltd.
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49 */
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50 public class HgBranches {
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51
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52 private final Map<String, BranchInfo> branches = new TreeMap<String, BranchInfo>();
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53 private final HgRepository repo;
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54 private boolean isCacheActual = false;
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55
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56 HgBranches(HgRepository hgRepo) {
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57 repo = hgRepo;
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58 }
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59
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60 private int readCache() {
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61 File branchheadsCache = getCacheFile();
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62 int lastInCache = -1;
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63 if (!branchheadsCache.canRead()) {
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64 return lastInCache;
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65 }
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66 BufferedReader br = null;
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67 final Pattern spacePattern = Pattern.compile(" ");
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68 try {
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69 final LinkedHashMap<String, List<Nodeid>> branchHeads = new LinkedHashMap<String, List<Nodeid>>();
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70 br = new BufferedReader(new FileReader(branchheadsCache));
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71 String line = br.readLine();
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72 if (line == null || line.trim().length() == 0) {
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73 return lastInCache;
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74 }
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75 String[] cacheIdentity = spacePattern.split(line.trim());
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76 lastInCache = Integer.parseInt(cacheIdentity[1]);
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77 final int lastKnownRepoRevIndex = repo.getChangelog().getLastRevision();
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78 if (lastInCache > lastKnownRepoRevIndex || !repo.getChangelog().getRevision(lastKnownRepoRevIndex).equals(Nodeid.fromAscii(cacheIdentity[0]))) {
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79 // there are chances cache file got invalid entries due to e.g. rollback operation
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80 return -1;
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81 }
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82 while ((line = br.readLine()) != null) {
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83 String[] elements = spacePattern.split(line.trim());
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84 if (elements.length != 2) {
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85 // bad entry
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86 continue;
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87 }
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88 // I assume split returns substrings of the original string, hence copy of a branch name
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89 String branchName = new String(elements[elements.length-1]);
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90 List<Nodeid> heads = branchHeads.get(elements[1]);
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91 if (heads == null) {
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92 branchHeads.put(branchName, heads = new LinkedList<Nodeid>());
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93 }
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94 heads.add(Nodeid.fromAscii(elements[0]));
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95 }
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96 for (Map.Entry<String, List<Nodeid>> e : branchHeads.entrySet()) {
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97 Nodeid[] heads = e.getValue().toArray(new Nodeid[e.getValue().size()]);
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98 BranchInfo bi = new BranchInfo(e.getKey(), heads);
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99 branches.put(e.getKey(), bi);
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100 }
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101 return lastInCache;
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102 } catch (IOException ex) {
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103 // log error, but otherwise do nothing
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104 repo.getContext().getLog().warn(getClass(), ex, null);
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105 // FALL THROUGH to return -1 indicating no cache information
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106 } catch (NumberFormatException ex) {
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107 repo.getContext().getLog().warn(getClass(), ex, null);
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108 // FALL THROUGH
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109 } catch (HgInvalidControlFileException ex) {
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110 // shall not happen, thus log as error
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111 repo.getContext().getLog().error(getClass(), ex, null);
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112 // FALL THROUGH
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113 } catch (HgInvalidRevisionException ex) {
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114 repo.getContext().getLog().error(getClass(), ex, null);
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115 // FALL THROUGH
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116 } finally {
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117 if (br != null) {
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118 try {
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119 br.close();
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120 } catch (IOException ex) {
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121 repo.getContext().getLog().info(getClass(), ex, null); // ignore
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122 }
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123 }
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124 }
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125 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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126 }
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127
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128 void collect(final ProgressSupport ps) throws HgInvalidControlFileException {
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129 branches.clear();
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130 ps.start(1 + repo.getChangelog().getRevisionCount() * 2);
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131 //
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132 int lastCached = readCache();
244
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133 isCacheActual = lastCached == repo.getChangelog().getLastRevision();
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134 if (!isCacheActual) {
236
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135 final HgChangelog.ParentWalker pw = repo.getChangelog().new ParentWalker();
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136 pw.init();
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137 ps.worked(repo.getChangelog().getRevisionCount());
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138 // first revision branch found at
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139 final HashMap<String, Nodeid> branchStart = new HashMap<String, Nodeid>();
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140 // last revision seen for the branch
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141 final HashMap<String, Nodeid> branchLastSeen = new HashMap<String, Nodeid>();
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142 // revisions from the branch that have no children at all
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143 final HashMap<String, List<Nodeid>> branchHeads = new HashMap<String, List<Nodeid>>();
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144 // revisions that are immediate children of a node from a given branch
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145 // after iteration, there are some revisions left in this map (children of a branch last revision
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146 // that doesn't belong to the branch. No use of this now, perhaps can deduce isInactive (e.g.those
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147 // branches that have non-empty candidates are inactive if all their heads are roots for those left)
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148 final HashMap<String, List<Nodeid>> branchHeadCandidates = new HashMap<String, List<Nodeid>>();
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149 HgChangelog.Inspector insp = new HgChangelog.Inspector() {
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150
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151 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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152 String branchName = cset.branch();
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153 if (!branchStart.containsKey(branchName)) {
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154 branchStart.put(branchName, nodeid);
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155 branchHeads.put(branchName, new LinkedList<Nodeid>());
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156 branchHeadCandidates.put(branchName, new LinkedList<Nodeid>());
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157 } else {
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158 final List<Nodeid> headCandidates = branchHeadCandidates.get(branchName);
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159 if (headCandidates.remove(nodeid)) {
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160 // 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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161 // however, it's possible the child we found is a result of an earlier fork, and revision in the
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162 // branchLastSeen is 'parallel' head, which needs to be kept
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163 Nodeid lastSeenInBranch = branchLastSeen.get(branchName);
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164 // check if current revision is on descendant line. Seems direct parents check is enough
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165 if (pw.safeFirstParent(nodeid).equals(lastSeenInBranch) || pw.safeSecondParent(nodeid).equals(lastSeenInBranch)) {
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166 branchLastSeen.remove(branchName);
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167 }
236
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168 }
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169 }
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170 List<Nodeid> immediateChildren = pw.directChildren(nodeid);
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171 if (immediateChildren.size() > 0) {
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172 // 1) children may be in another branch
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173 // and unless we later came across another element from this branch,
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174 // we need to record all these as potential heads
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175 //
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176 // 2) head1 with children in different branch, and head2 in this branch without children
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177 branchLastSeen.put(branchName, nodeid);
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178 branchHeadCandidates.get(branchName).addAll(immediateChildren);
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179 } else {
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180 // no more children known for this node, it's (one of the) head of the branch
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181 branchHeads.get(branchName).add(nodeid);
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182 }
236
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183 ps.worked(1);
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184 }
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185 };
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186 repo.getChangelog().range(lastCached == -1 ? 0 : lastCached+1, HgRepository.TIP, insp);
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187 // those last seen revisions from the branch that had no children from the same branch are heads.
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188 for (String bn : branchLastSeen.keySet()) {
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189 // these are inactive branches? - there were children, but not from the same branch?
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190 branchHeads.get(bn).add(branchLastSeen.get(bn));
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191 }
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192 for (String bn : branchStart.keySet()) {
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193 BranchInfo bi = branches.get(bn);
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194 if (bi != null) {
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195 // although heads from cache shall not intersect with heads after lastCached,
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196 // use of LHS doesn't hurt (and makes sense e.g. if cache is not completely correct in my tests)
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197 LinkedHashSet<Nodeid> heads = new LinkedHashSet<Nodeid>(bi.getHeads());
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198 for (Nodeid oldHead : bi.getHeads()) {
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199 // XXX perhaps, need pw.canReach(Nodeid from, Collection<Nodeid> to)
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200 List<Nodeid> newChildren = pw.childrenOf(Collections.singletonList(oldHead));
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201 if (!newChildren.isEmpty()) {
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202 // likely not a head any longer,
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203 // check if any new head can be reached from old one, and, if yes,
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204 // do not consider that old head as head.
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205 for (Nodeid newHead : branchHeads.get(bn)) {
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206 if (newChildren.contains(newHead)) {
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207 heads.remove(oldHead);
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208 break;
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209 }
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210 }
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211 } // else - oldHead still head for the branch
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212 }
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213 heads.addAll(branchHeads.get(bn));
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214 bi = new BranchInfo(bn, bi.getStart(), heads.toArray(new Nodeid[0]));
236
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215 } else {
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216 Nodeid[] heads = branchHeads.get(bn).toArray(new Nodeid[0]);
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217 bi = new BranchInfo(bn, branchStart.get(bn), heads);
236
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218 }
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219 branches.put(bn, bi);
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220 }
220
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221 }
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222 final HgChangelog clog = repo.getChangelog();
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223 final HgChangelog.RevisionMap rmap = clog.new RevisionMap().init();
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224 for (BranchInfo bi : branches.values()) {
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225 bi.validate(clog, rmap);
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226 }
220
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227 ps.done();
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228 }
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229
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230 public List<BranchInfo> getAllBranches() {
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231 return new LinkedList<BranchInfo>(branches.values());
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232
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233 }
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234
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235 public BranchInfo getBranch(String name) {
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236 return branches.get(name);
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237 }
244
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238
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239 /**
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240 * Writes down information about repository branches in a format Mercurial native client can understand.
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241 * Cache file gets overwritten only if it is out of date (i.e. misses some branch information)
354
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242 * @throws IOException if write to cache file failed
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243 * @throws HgException subclass of {@link HgException} in case of repository access issue
244
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244 */
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245 @Experimental(reason="Usage of cache isn't supposed to be public knowledge")
354
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246 public void writeCache() throws IOException, HgException {
244
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247 if (isCacheActual) {
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248 return;
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249 }
354
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250 File branchheadsCache = getCacheFile();
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251 if (!branchheadsCache.exists()) {
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252 branchheadsCache.getParentFile().mkdirs(); // just in case cache/ doesn't exist jet
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253 branchheadsCache.createNewFile();
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254 }
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255 if (!branchheadsCache.canWrite()) {
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256 return;
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257 }
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258 final int lastRev = repo.getChangelog().getLastRevision();
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259 final Nodeid lastNid = repo.getChangelog().getRevision(lastRev);
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260 BufferedWriter bw = new BufferedWriter(new FileWriter(branchheadsCache));
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261 bw.write(lastNid.toString());
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262 bw.write((int) ' ');
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263 bw.write(Integer.toString(lastRev));
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264 bw.write("\n");
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265 for (BranchInfo bi : branches.values()) {
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266 for (Nodeid nid : bi.getHeads()) {
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267 bw.write(nid.toString());
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268 bw.write((int) ' ');
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269 bw.write(bi.getName());
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270 bw.write("\n");
244
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271 }
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272 }
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273 bw.close();
244
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274 }
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275
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276 private File getCacheFile() {
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277 // prior to 1.8 used to be .hg/branchheads.cache
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278 return new File(repo.getRepositoryRoot(), "cache/branchheads");
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279 }
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280
220
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281 public static class BranchInfo {
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282 private final String name;
308
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283 private List<Nodeid> heads;
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284 private boolean closed;
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285 private final Nodeid start;
315
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286 private List<Nodeid> closedHeads; // subset of heads, those that bear 'closed' flag, or null if closed == true
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287
236
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288 // XXX in fact, few but not all branchHeads might be closed, and isClosed for whole branch is not
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289 // possible to determine.
308
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290 BranchInfo(String branchName, Nodeid first, Nodeid[] branchHeads) {
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291 name = branchName;
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292 start = first;
308
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293 heads = Arrays.asList(branchHeads);
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294 }
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295
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296 // incomplete branch, there's not enough information at the time of creation. shall be replaced with
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297 // proper BI in #collect()
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298 BranchInfo(String branchName, Nodeid[] branchHeads) {
308
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299 this(branchName, Nodeid.NULL, branchHeads);
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300 }
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301
366
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302 void validate(HgChangelog clog, HgChangelog.RevisionMap rmap) throws HgInvalidControlFileException {
308
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303 int[] localCset = new int[heads.size()];
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304 int i = 0;
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305 for (Nodeid h : heads) {
367
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306 localCset[i++] = rmap.revisionIndex(h);
308
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307 }
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308 // [0] tipmost, [1] tipmost open
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309 final Nodeid[] tipmost = new Nodeid[] {null, null};
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310 final boolean[] allClosed = new boolean[] { true };
315
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311 final ArrayList<Nodeid> _closedHeads = new ArrayList<Nodeid>(heads.size());
308
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312 clog.range(new HgChangelog.Inspector() {
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313
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314 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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315 assert heads.contains(nodeid);
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316 tipmost[0] = nodeid;
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317 if (!"1".equals(cset.extras().get("close"))) {
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318 tipmost[1] = nodeid;
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319 allClosed[0] = false;
315
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320 } else {
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321 _closedHeads.add(nodeid);
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322 }
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323 }
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324 }, localCset);
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325 closed = allClosed[0];
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326 Nodeid[] outcome = new Nodeid[localCset.length];
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327 i = 0;
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328 if (!closed && tipmost[1] != null) {
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329 outcome[i++] = tipmost[1];
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330 if (i < outcome.length && !tipmost[0].equals(tipmost[1])) {
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331 outcome[i++] = tipmost[0];
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332 }
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333 } else {
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334 outcome[i++] = tipmost[0];
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335 }
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336 for (Nodeid h : heads) {
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337 if (!h.equals(tipmost[0]) && !h.equals(tipmost[1])) {
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338 outcome[i++] = h;
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339 }
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340 }
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341 heads = Arrays.asList(outcome);
315
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342 if (closed) {
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343 // no need
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344 closedHeads = null;
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345 } else {
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346 _closedHeads.trimToSize();
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347 closedHeads = _closedHeads;
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348 }
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349 }
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350
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351 public String getName() {
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352 return name;
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353 }
308
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354 /**
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355 * @return <code>true</code> if all heads of this branch are marked as closed
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356 */
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357 public boolean isClosed() {
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358 return closed;
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359 }
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360
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361 /**
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362 * @return all heads for the branch, both open and closed, tip-most head first
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363 */
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364 public List<Nodeid> getHeads() {
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365 return heads;
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366 }
315
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367
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368 /**
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369 *
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370 * @param head one of revision from {@link #getHeads() heads} of this branch
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371 * @return true if this particular head is closed
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372 * @throws IllegalArgumentException if argument is not from {@link #getHeads() heads} of this branch
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373 */
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374 public boolean isClosed(Nodeid head) {
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375 if (!heads.contains(head)) {
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376 throw new IllegalArgumentException(String.format("Revision %s does not belong to heads of %s branch", head, name), null);
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377 }
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378 if (closed) {
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379 return true;
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380 }
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381 return closedHeads.contains(head);
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382 }
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383 // public Nodeid getTip() {
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384 // }
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385 /*public*/ Nodeid getStart() {
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386 // first node where branch appears
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
387 return start;
8de327242aa0 Basic information about branches
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
388 }
8de327242aa0 Basic information about branches
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
389 }
8de327242aa0 Basic information about branches
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
390 }