Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgBranches.java @ 711:a62079bc422b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Keyword filtering that doesn't depend on input buffer size and the way input lines got split between filter() calls. KewordFilter got state to keep processed suspicious ...$ lines
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 11 Oct 2013 21:35:41 +0200
parents af5223b86dd3
children
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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18
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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20 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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21
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22 import java.io.BufferedReader;
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23 import java.io.BufferedWriter;
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24 import java.io.File;
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25 import java.io.FileReader;
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26 import java.io.FileWriter;
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27 import java.io.IOException;
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28 import java.util.ArrayList;
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29 import java.util.Arrays;
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30 import java.util.HashMap;
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31 import java.util.Iterator;
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32 import java.util.LinkedHashMap;
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33 import java.util.LinkedHashSet;
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34 import java.util.LinkedList;
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35 import java.util.List;
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36 import java.util.Map;
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37 import java.util.TreeMap;
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38 import java.util.regex.Pattern;
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40 import org.tmatesoft.hg.core.Nodeid;
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41 import org.tmatesoft.hg.internal.ChangelogMonitor;
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42 import org.tmatesoft.hg.internal.Experimental;
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43 import org.tmatesoft.hg.internal.FileUtils;
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44 import org.tmatesoft.hg.internal.Internals;
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45 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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46 import org.tmatesoft.hg.util.ProgressSupport;
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47
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48 /**
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49 * Access information about branches in the repository
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50 *
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51 * @author Artem Tikhomirov
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52 * @author TMate Software Ltd.
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53 */
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54 public class HgBranches {
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55
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56 private final Internals internalRepo;
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57 private final ChangelogMonitor repoChangeTracker;
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58 private final Map<String, BranchInfo> branches = new TreeMap<String, BranchInfo>();
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59 private boolean isCacheActual = false;
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60
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61 HgBranches(Internals internals) {
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62 internalRepo = internals;
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63 repoChangeTracker = new ChangelogMonitor(internals.getRepo());
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64 }
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65
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66 private int readCache() {
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67 final HgRepository repo = internalRepo.getRepo();
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68 File branchheadsCache = getCacheFile();
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69 int lastInCache = -1;
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70 if (!branchheadsCache.canRead()) {
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71 return lastInCache;
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72 }
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73 BufferedReader br = null; // TODO replace with LineReader
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74 final Pattern spacePattern = Pattern.compile(" ");
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75 try {
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76 final LinkedHashMap<String, List<Nodeid>> branchHeads = new LinkedHashMap<String, List<Nodeid>>();
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77 br = new BufferedReader(new FileReader(branchheadsCache));
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78 String line = br.readLine();
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79 if (line == null || line.trim().length() == 0) {
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80 return lastInCache;
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81 }
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82 String[] cacheIdentity = spacePattern.split(line.trim());
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83 lastInCache = Integer.parseInt(cacheIdentity[1]);
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84 final int lastKnownRepoRevIndex = repo.getChangelog().getLastRevision();
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85 if (lastInCache > lastKnownRepoRevIndex || !repo.getChangelog().getRevision(lastKnownRepoRevIndex).equals(Nodeid.fromAscii(cacheIdentity[0]))) {
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86 // there are chances cache file got invalid entries due to e.g. rollback operation
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87 return -1;
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88 }
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89 while ((line = br.readLine()) != null) {
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90 String[] elements = spacePattern.split(line.trim());
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91 if (elements.length != 2) {
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92 // bad entry
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93 continue;
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94 }
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95 // I assume split returns substrings of the original string, hence copy of a branch name
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96 String branchName = new String(elements[elements.length-1]);
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97 List<Nodeid> heads = branchHeads.get(elements[1]);
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98 if (heads == null) {
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99 branchHeads.put(branchName, heads = new LinkedList<Nodeid>());
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100 }
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101 heads.add(Nodeid.fromAscii(elements[0]));
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102 }
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103 for (Map.Entry<String, List<Nodeid>> e : branchHeads.entrySet()) {
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104 Nodeid[] heads = e.getValue().toArray(new Nodeid[e.getValue().size()]);
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105 BranchInfo bi = new BranchInfo(e.getKey(), heads);
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106 branches.put(e.getKey(), bi);
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107 }
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108 return lastInCache;
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109 } catch (IOException ex) {
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110 // log error, but otherwise do nothing
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111 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null);
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112 // FALL THROUGH to return -1 indicating no cache information
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113 } catch (NumberFormatException ex) {
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114 repo.getSessionContext().getLog().dump(getClass(), Warn, ex, null);
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115 // FALL THROUGH
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116 } catch (HgRuntimeException ex) {
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117 // if happens, log error and pretend there's no cache
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118 repo.getSessionContext().getLog().dump(getClass(), Error, ex, null);
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119 // FALL THROUGH
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120 } finally {
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121 new FileUtils(repo.getSessionContext().getLog(), this).closeQuietly(br);
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122 }
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123 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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124 }
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125
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126 void collect(final ProgressSupport ps) throws HgRuntimeException {
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127 branches.clear();
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128 final HgRepository repo = internalRepo.getRepo();
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129 final HgChangelog clog = repo.getChangelog();
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130 final HgRevisionMap<HgChangelog> rmap;
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131 ps.start(1 + clog.getRevisionCount() * 2);
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132 //
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133 int lastCached = readCache();
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134 isCacheActual = lastCached == clog.getLastRevision();
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135 if (!isCacheActual) {
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136 // XXX need a way to share HgParentChildMap<HgChangelog>
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137 final HgParentChildMap<HgChangelog> pw = new HgParentChildMap<HgChangelog>(clog);
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138 pw.init();
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139 ps.worked(clog.getRevisionCount());
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140 //
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141 // first revision branch found at
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142 final HashMap<String, Nodeid> branchStart = new HashMap<String, Nodeid>();
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143 // revisions from the branch that have no children at all
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144 final HashMap<String, List<Nodeid>> branchHeads = new HashMap<String, List<Nodeid>>();
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145 HgChangelog.Inspector insp = new HgChangelog.Inspector() {
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146
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147 private final ArrayList<Nodeid> parents = new ArrayList<Nodeid>(3);
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148
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149 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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150 String branchName = cset.branch();
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151 List<Nodeid> _branchHeads;
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152 // there are chances (with --force key) branch can get more than one start
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153 // revision. Neither BranchInfo nor this code support this scenario at the moment.
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154 if (!branchStart.containsKey(branchName)) {
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155 branchStart.put(branchName, nodeid);
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156 branchHeads.put(branchName, _branchHeads = new LinkedList<Nodeid>());
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157 } else {
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158 _branchHeads = branchHeads.get(branchName);
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159 if (_branchHeads == null) {
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160 branchHeads.put(branchName, _branchHeads = new LinkedList<Nodeid>());
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161 }
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162 }
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163 // so far present node is the best candidate for head
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164 _branchHeads.add(nodeid);
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165 parents.clear();
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166 // parents of this node, however, cease to be heads (if they are from this branch)
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167 pw.appendParentsOf(nodeid, parents);
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168 _branchHeads.removeAll(parents);
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169 ps.worked(1);
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170 }
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171 };
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172 // XXX alternatively may iterate with pw.all().subList(lastCached)
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173 // but need an effective way to find out branch of particular changeset
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174 clog.range(lastCached == -1 ? 0 : lastCached+1, HgRepository.TIP, insp);
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175 //
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176 // build BranchInfo, based on found and cached
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177 for (String bn : branchStart.keySet()) {
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178 BranchInfo bi = branches.get(bn);
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179 if (bi != null) {
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180 // combine heads found so far with those cached
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181 LinkedHashSet<Nodeid> oldHeads = new LinkedHashSet<Nodeid>(bi.getHeads());
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182 // expect size of both oldHeads and newHeads sets to be small, and for x for hence acceptable.
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183 for (Nodeid newHead : branchHeads.get(bn)) {
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184 for (Iterator<Nodeid> it = oldHeads.iterator(); it.hasNext();) {
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185 if (pw.isChild(it.next(), newHead)) {
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186 it.remove();
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187 }
236
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188 }
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189 }
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190 oldHeads.addAll(branchHeads.get(bn));
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191 assert oldHeads.size() > 0;
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192 bi = new BranchInfo(bn, bi.getStart(), oldHeads.toArray(new Nodeid[oldHeads.size()]));
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193 } else {
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194 Nodeid[] heads = branchHeads.get(bn).toArray(new Nodeid[0]);
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195 bi = new BranchInfo(bn, branchStart.get(bn), heads);
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196 }
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197 branches.put(bn, bi);
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198 }
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199 rmap = pw.getRevisionMap();
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200 } else { // !cacheActual
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201 rmap = new HgRevisionMap<HgChangelog>(clog).init();
220
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202 }
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203 for (BranchInfo bi : branches.values()) {
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204 bi.validate(clog, rmap);
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205 }
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206 repoChangeTracker.touch();
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207 ps.done();
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208 }
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209
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210 public List<BranchInfo> getAllBranches() throws HgInvalidControlFileException {
220
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211 return new LinkedList<BranchInfo>(branches.values());
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212
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213 }
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214
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215 public BranchInfo getBranch(String name) throws HgInvalidControlFileException {
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216 return branches.get(name);
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217 }
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218
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219 /**
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220 * Writes down information about repository branches in a format Mercurial native client can understand.
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221 * Cache file gets overwritten only if it is out of date (i.e. misses some branch information)
354
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222 * @throws IOException if write to cache file failed
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223 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
244
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224 */
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225 @Experimental(reason="Usage of cache isn't supposed to be public knowledge")
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226 public void writeCache() throws IOException, HgRuntimeException {
244
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227 if (isCacheActual) {
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228 return;
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229 }
354
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230 File branchheadsCache = getCacheFile();
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231 if (!branchheadsCache.exists()) {
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232 branchheadsCache.getParentFile().mkdirs(); // just in case cache/ doesn't exist jet
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233 branchheadsCache.createNewFile();
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234 }
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235 if (!branchheadsCache.canWrite()) {
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236 return;
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237 }
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238 final HgRepository repo = internalRepo.getRepo();
354
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239 final int lastRev = repo.getChangelog().getLastRevision();
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240 final Nodeid lastNid = repo.getChangelog().getRevision(lastRev);
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241 BufferedWriter bw = new BufferedWriter(new FileWriter(branchheadsCache));
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242 bw.write(lastNid.toString());
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243 bw.write((int) ' ');
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244 bw.write(Integer.toString(lastRev));
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245 bw.write("\n");
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246 for (BranchInfo bi : branches.values()) {
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247 for (Nodeid nid : bi.getHeads()) {
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248 bw.write(nid.toString());
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249 bw.write((int) ' ');
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250 bw.write(bi.getName());
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251 bw.write("\n");
244
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252 }
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253 }
354
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254 bw.close();
244
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255 }
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256
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257 private File getCacheFile() {
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258 // prior to 1.8 used to be .hg/branchheads.cache
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259 // since 2.5 there is filter suffix
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260 File f = internalRepo.getFileFromRepoDir("cache/branchheads-base");
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261 if (f.exists()) {
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262 return f;
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263 }
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264 return internalRepo.getFileFromRepoDir("cache/branchheads");
244
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265 }
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266
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267 /*package-local*/ void reloadIfChanged(ProgressSupport ps) throws HgRuntimeException {
610
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268 if (repoChangeTracker.isChanged()) {
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269 collect(ps);
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270 }
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271 }
244
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272
220
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273 public static class BranchInfo {
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274 private final String name;
308
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275 private List<Nodeid> heads;
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276 private boolean closed;
220
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277 private final Nodeid start;
315
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278 private List<Nodeid> closedHeads; // subset of heads, those that bear 'closed' flag, or null if closed == true
220
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279
236
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280 // XXX in fact, few but not all branchHeads might be closed, and isClosed for whole branch is not
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281 // possible to determine.
308
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282 BranchInfo(String branchName, Nodeid first, Nodeid[] branchHeads) {
220
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283 name = branchName;
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284 start = first;
308
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285 heads = Arrays.asList(branchHeads);
220
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286 }
236
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287
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288 // incomplete branch, there's not enough information at the time of creation. shall be replaced with
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289 // proper BI in #collect()
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290 BranchInfo(String branchName, Nodeid[] branchHeads) {
308
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291 this(branchName, Nodeid.NULL, branchHeads);
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292 }
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293
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294 void validate(HgChangelog clog, HgRevisionMap<HgChangelog> rmap) throws HgRuntimeException {
308
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295 int[] localCset = new int[heads.size()];
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296 int i = 0;
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297 for (Nodeid h : heads) {
367
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298 localCset[i++] = rmap.revisionIndex(h);
308
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299 }
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300 // [0] tipmost, [1] tipmost open
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301 final Nodeid[] tipmost = new Nodeid[] {null, null};
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302 final boolean[] allClosed = new boolean[] { true };
315
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303 final ArrayList<Nodeid> _closedHeads = new ArrayList<Nodeid>(heads.size());
308
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304 clog.range(new HgChangelog.Inspector() {
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305
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306 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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307 assert heads.contains(nodeid);
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308 tipmost[0] = nodeid;
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309 if (!"1".equals(cset.extras().get("close"))) {
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310 tipmost[1] = nodeid;
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311 allClosed[0] = false;
315
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312 } else {
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313 _closedHeads.add(nodeid);
308
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314 }
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315 }
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316 }, localCset);
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317 closed = allClosed[0];
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318 Nodeid[] outcome = new Nodeid[localCset.length];
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319 i = 0;
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320 if (!closed && tipmost[1] != null) {
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321 outcome[i++] = tipmost[1];
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322 if (i < outcome.length && !tipmost[0].equals(tipmost[1])) {
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323 outcome[i++] = tipmost[0];
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324 }
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325 } else {
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326 outcome[i++] = tipmost[0];
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327 }
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328 for (Nodeid h : heads) {
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329 if (!h.equals(tipmost[0]) && !h.equals(tipmost[1])) {
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330 outcome[i++] = h;
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331 }
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332 }
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333 heads = Arrays.asList(outcome);
315
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334 if (closed) {
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335 // no need
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336 closedHeads = null;
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337 } else {
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338 _closedHeads.trimToSize();
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339 closedHeads = _closedHeads;
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340 }
236
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341 }
220
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342
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343 public String getName() {
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344 return name;
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345 }
308
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346 /**
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347 * @return <code>true</code> if all heads of this branch are marked as closed
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348 */
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349 public boolean isClosed() {
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350 return closed;
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351 }
315
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352
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353 /**
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354 * @return all heads for the branch, both open and closed, tip-most head first
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355 */
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356 public List<Nodeid> getHeads() {
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357 return heads;
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358 }
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359
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360 /**
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361 *
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362 * @param head one of revision from {@link #getHeads() heads} of this branch
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363 * @return true if this particular head is closed
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364 * @throws IllegalArgumentException if argument is not from {@link #getHeads() heads} of this branch
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365 */
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366 public boolean isClosed(Nodeid head) {
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367 if (!heads.contains(head)) {
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368 throw new IllegalArgumentException(String.format("Revision %s does not belong to heads of %s branch", head, name), null);
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369 }
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370 if (closed) {
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371 return true;
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372 }
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373 return closedHeads.contains(head);
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374 }
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375 // public Nodeid getTip() {
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376 // }
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377 // XXX Not public as there are chances for few possible branch starts, and I need to decide how to handle that
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378 /*public*/ Nodeid getStart() {
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379 // first node where branch appears
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380 return start;
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381 }
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382 }
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383 }