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annotate src/org/tmatesoft/hg/repo/Revlog.java @ 431:12f668401613

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FIXMEs: awkward API refactored, what need to be internal got hidden; public aspects got captured in slim interfaces
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 29 Mar 2012 20:54:04 +0200
parents 48f993aa2f41
children 1fc0da631200
rev   line source
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1 /*
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2 * Copyright (c) 2010-2012 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.repo.HgRepository.*;
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21 import java.io.IOException;
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22 import java.nio.ByteBuffer;
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23 import java.util.ArrayList;
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24 import java.util.Arrays;
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25 import java.util.Collection;
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26 import java.util.HashSet;
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27 import java.util.LinkedList;
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28 import java.util.List;
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30 import org.tmatesoft.hg.core.Nodeid;
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31 import org.tmatesoft.hg.internal.ArrayHelper;
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32 import org.tmatesoft.hg.internal.DataAccess;
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33 import org.tmatesoft.hg.internal.Experimental;
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34 import org.tmatesoft.hg.internal.Preview;
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35 import org.tmatesoft.hg.internal.RevlogStream;
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36 import org.tmatesoft.hg.util.Adaptable;
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37 import org.tmatesoft.hg.util.ByteChannel;
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38 import org.tmatesoft.hg.util.CancelSupport;
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39 import org.tmatesoft.hg.util.CancelledException;
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40 import org.tmatesoft.hg.util.LogFacility;
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41 import org.tmatesoft.hg.util.ProgressSupport;
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43
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44 /**
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45 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files).
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46 *
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47 * Implementation note:
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48 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal
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49 * in public methods.
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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 abstract class Revlog {
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56 private final HgRepository repo;
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57 protected final RevlogStream content;
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59 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) {
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60 if (hgRepo == null) {
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61 throw new IllegalArgumentException();
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62 }
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63 if (contentStream == null) {
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64 throw new IllegalArgumentException();
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65 }
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66 repo = hgRepo;
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67 content = contentStream;
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68 }
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70 // invalid Revlog
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71 protected Revlog(HgRepository hgRepo) {
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72 repo = hgRepo;
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73 content = null;
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74 }
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76 public final HgRepository getRepo() {
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77 return repo;
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78 }
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80 /**
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81 * @return total number of revisions kept in this revlog
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82 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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83 */
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84 public final int getRevisionCount() throws HgRuntimeException {
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85 return content.revisionCount();
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86 }
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87
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88 /**
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89 * @return index of last known revision, a.k.a. {@link HgRepository#TIP}
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90 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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91 */
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92 public final int getLastRevision() throws HgRuntimeException {
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93 return content.revisionCount() - 1;
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94 }
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95
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96 /**
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97 * Map revision index to unique revision identifier (nodeid).
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98 *
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99 * @param revision index of the entry in this revlog, may be {@link HgRepository#TIP}
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100 * @return revision nodeid of the entry
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101 *
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102 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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103 */
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104 public final Nodeid getRevision(int revision) throws HgRuntimeException {
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105 // XXX cache nodeids? Rather, if context.getCache(this).getRevisionMap(create == false) != null, use it
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106 return Nodeid.fromBinary(content.nodeid(revision), 0);
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107 }
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108
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109 /**
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110 * Effective alternative to map few revision indexes to corresponding nodeids at once.
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111 * <p>Note, there are few aspects to be careful about when using this method<ul>
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112 * <li>ordering of the revisions in the return list is unspecified, it's likely won't match that of the method argument
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113 * <li>supplied array get modified (sorted)</ul>
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114 * @return list of mapped revisions in no particular order
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115 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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116 */
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117 public final List<Nodeid> getRevisions(int... revisions) throws HgRuntimeException {
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118 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(revisions.length);
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119 Arrays.sort(revisions);
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120 getRevisionsInternal(rv, revisions);
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121 return rv;
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122 }
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123
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124 /*package-local*/ void getRevisionsInternal(final List<Nodeid> retVal, int[] sortedRevs) throws HgInvalidRevisionException, HgInvalidControlFileException {
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125 // once I have getRevisionMap and may find out whether it is avalable from cache,
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126 // may use it, perhaps only for small number of revisions
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127 content.iterate(sortedRevs, false, new RevlogStream.Inspector() {
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128
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129 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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130 retVal.add(Nodeid.fromBinary(nodeid, 0));
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131 }
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132 });
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133 }
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134
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135 /**
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136 * Get local index of the specified revision.
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137 * If unsure, use {@link #isKnown(Nodeid)} to find out whether nodeid belongs to this revlog.
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138 *
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139 * For occasional queries, this method works with decent performance, despite its O(n/2) approach.
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140 * Alternatively, if you need to perform multiple queries (e.g. at least 15-20), {@link Revlog.RevisionMap} may come handy.
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141 *
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142 * @param nid revision to look up
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143 * @return revision local index in this revlog
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144 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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145 */
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146 public final int getRevisionIndex(Nodeid nid) throws HgRuntimeException {
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147 int revision = content.findRevisionIndex(nid);
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148 if (revision == BAD_REVISION) {
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149 // using toString() to identify revlog. HgDataFile.toString includes path, HgManifest and HgChangelog instances
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150 // are fine with default (class name)
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151 // Perhaps, more tailored description method would be suitable here
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152 throw new HgInvalidRevisionException(String.format("Can't find revision %s in %s", nid.shortNotation(), this), nid, null);
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153 }
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154 return revision;
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155 }
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156
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157 /**
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158 * Note, {@link Nodeid#NULL} nodeid is not reported as known in any revlog.
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159 *
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160 * @param nodeid
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161 * @return <code>true</code> if revision is part of this revlog
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162 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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163 */
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164 public final boolean isKnown(Nodeid nodeid) throws HgRuntimeException {
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165 final int rn = content.findRevisionIndex(nodeid);
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166 if (BAD_REVISION == rn) {
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167 return false;
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168 }
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169 if (rn < 0 || rn >= content.revisionCount()) {
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170 // Sanity check
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171 throw new HgInvalidStateException(String.format("Revision index %d found for nodeid %s is not from the range [0..%d]", rn, nodeid.shortNotation(), content.revisionCount()-1));
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172 }
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173 return true;
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174 }
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175
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176 /**
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177 * Access to revision data as is, equivalent to <code>rawContent(getRevisionIndex(nodeid), sink)</code>
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178 *
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179 * @param nodeid revision to retrieve
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180 * @param sink data destination
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181 *
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182 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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183 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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184 * @throws CancelledException if content retrieval operation was cancelled
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185 *
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186 * @see #rawContent(int, ByteChannel)
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187 */
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188 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException {
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189 rawContent(getRevisionIndex(nodeid), sink);
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190 }
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191
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192 /**
394
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193 * Access to revision data as is (decompressed, but otherwise unprocessed, i.e. not parsed for e.g. changeset or manifest entries).
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194 *
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195 * @param revisionIndex index of this revlog change (not a changelog revision index), non-negative. From predefined constants, only {@link HgRepository#TIP} makes sense.
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196 * @param sink data destination
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197 *
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198 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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199 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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200 * @throws CancelledException if content retrieval operation was cancelled
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201 */
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202 protected void rawContent(int revisionIndex, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException {
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203 if (sink == null) {
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204 throw new IllegalArgumentException();
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205 }
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206 try {
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207 ContentPipe insp = new ContentPipe(sink, 0, repo.getContext().getLog());
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208 insp.checkCancelled();
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209 content.iterate(revisionIndex, revisionIndex, true, insp);
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210 insp.checkFailed();
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211 } catch (IOException ex) {
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212 HgInvalidControlFileException e = new HgInvalidControlFileException(String.format("Access to revision %d content failed", revisionIndex), ex, null);
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213 e.setRevisionIndex(revisionIndex);
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214 // TODO post 1.0 e.setFileName(content.getIndexFile() or this.getHumanFriendlyPath()) - shall decide whether
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215 // protected abstract getHFPath() with impl in HgDataFile, HgManifest and HgChangelog or path is data of either Revlog or RevlogStream
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216 // Do the same (add file name) below
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217 throw e;
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218 } catch (HgInvalidControlFileException ex) {
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219 throw ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(revisionIndex);
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220 }
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221 }
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222
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223 /**
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224 * Fills supplied arguments with information about revision parents.
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225 *
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226 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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227 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1}), {@link HgRepository#NO_REVISION} indicates parent not set
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228 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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229 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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230 * @throws IllegalArgumentException if passed arrays can't fit requested data
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231 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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232 */
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233 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) throws HgRuntimeException, IllegalArgumentException {
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234 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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235 throw new HgInvalidRevisionException(revision);
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236 }
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237 if (parentRevisions == null || parentRevisions.length < 2) {
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238 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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239 }
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240 if (parent1 != null && parent1.length < 20) {
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241 throw new IllegalArgumentException(parent1.toString());
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242 }
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243 if (parent2 != null && parent2.length < 20) {
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244 throw new IllegalArgumentException(parent2.toString());
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245 }
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246 class ParentCollector implements RevlogStream.Inspector {
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247 public int p1 = -1;
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248 public int p2 = -1;
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249 public byte[] nodeid;
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250
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251 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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252 p1 = parent1Revision;
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253 p2 = parent2Revision;
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254 this.nodeid = new byte[20];
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255 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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256 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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257 }
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258 };
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259 ParentCollector pc = new ParentCollector();
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260 content.iterate(revision, revision, false, pc);
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261 // although next code looks odd (NO_REVISION *is* -1), it's safer to be explicit
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262 parentRevisions[0] = pc.p1 == -1 ? NO_REVISION : pc.p1;
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263 parentRevisions[1] = pc.p2 == -1 ? NO_REVISION : pc.p2;
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264 if (parent1 != null) {
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265 if (parentRevisions[0] == NO_REVISION) {
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266 Arrays.fill(parent1, 0, 20, (byte) 0);
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267 } else {
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268 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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269 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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270 }
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271 }
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272 if (parent2 != null) {
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273 if (parentRevisions[1] == NO_REVISION) {
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274 Arrays.fill(parent2, 0, 20, (byte) 0);
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275 } else {
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276 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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277 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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278 }
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279 }
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280 }
425
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281
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282 /**
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283 * EXPERIMENTAL CODE, DO NOT USE
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284 *
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285 * Alternative revlog iteration
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286 *
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287 * @param start
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288 * @param end
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289 * @param inspector
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290 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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291 */
324
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292 @Experimental
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293 public void indexWalk(int start, int end, final Revlog.Inspector inspector) throws HgRuntimeException {
324
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294 int lastRev = getLastRevision();
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295 if (start == TIP) {
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296 start = lastRev;
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297 }
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298 if (end == TIP) {
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299 end = lastRev;
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300 }
356
91d75e1bac9f Consistent approach to deal with adaptable objects. Give adaptable precedence over instanceof to allow conditional response when classes do implement desired interface
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301 final RevisionInspector revisionInsp = Adaptable.Factory.getAdapter(inspector, RevisionInspector.class, null);
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302 final ParentInspector parentInsp = Adaptable.Factory.getAdapter(inspector, ParentInspector.class, null);
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303 final Nodeid[] allRevisions = parentInsp == null ? null : new Nodeid[end - start + 1];
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304
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305 content.iterate(start, end, false, new RevlogStream.Inspector() {
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306
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307 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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308 Nodeid nid = Nodeid.fromBinary(nodeid, 0);
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309 if (revisionInsp != null) {
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310 revisionInsp.next(revisionNumber, nid, linkRevision);
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311 }
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312 if (parentInsp != null) {
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313 Nodeid p1 = parent1Revision == -1 ? Nodeid.NULL : allRevisions[parent1Revision];
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314 Nodeid p2 = parent2Revision == -1 ? Nodeid.NULL : allRevisions[parent2Revision];
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315 allRevisions[revisionNumber] = nid;
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316 parentInsp.next(revisionNumber, nid, parent1Revision, parent2Revision, p1, p2);
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317 }
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318 }
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319 });
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320 }
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321
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322 /**
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323 * MARKER
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324 */
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325 @Experimental
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326 public interface Inspector {
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327 }
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328
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329 @Experimental
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330 public interface RevisionInspector extends Inspector {
368
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331 void next(int revisionIndex, Nodeid revision, int linkedRevisionIndex);
324
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332 }
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333
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334 @Experimental
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335 public interface ParentInspector extends Inspector {
327
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336 // XXX document whether parentX is -1 or a constant (BAD_REVISION? or dedicated?)
367
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337 void next(int revisionIndex, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2);
324
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338 }
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339
29
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340 /*
425
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341 * FIXME think over if it's better to do either:
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342 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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343 * or
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344 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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345 *
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346 * and yes, walker is not a proper name
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347 */
324
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348 public final class ParentWalker implements ParentInspector {
200
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349
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350
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351 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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352 private Nodeid[] sorted; // for binary search
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353 private int[] sorted2natural;
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354 private Nodeid[] firstParent;
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355 private Nodeid[] secondParent;
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356
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357 // Nodeid instances shall be shared between all arrays
29
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358
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359 public ParentWalker() {
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360 }
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361
192
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362 public HgRepository getRepo() {
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363 return Revlog.this.getRepo();
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364 }
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365
324
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366 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) {
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367 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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368 throw new IllegalStateException(); // sanity, revisions are sequential
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369 }
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370 int ix = revisionNumber;
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371 sequential[ix] = sorted[ix] = revision;
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372 if (parent1Revision != -1) {
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373 firstParent[ix] = sequential[parent1Revision];
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374 }
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375 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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376 secondParent[ix] = sequential[parent2Revision];
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377 }
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378 }
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379
366
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380 public void init() throws HgInvalidControlFileException {
324
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381 final int revisionCount = Revlog.this.getRevisionCount();
200
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382 firstParent = new Nodeid[revisionCount];
393
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383 // TODO [post 1.0] Branches/merges are less frequent, and most of secondParent would be -1/null, hence
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384 // IntMap might be better alternative here, but need to carefully analyze (test) whether this brings
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385 // real improvement (IntMap has 2n capacity, and element lookup is log(n) instead of array's constant)
200
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386 secondParent = new Nodeid[revisionCount];
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387 //
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388 sequential = new Nodeid[revisionCount];
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389 sorted = new Nodeid[revisionCount];
431
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390 Revlog.this.indexWalk(0, TIP, this);
200
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391 Arrays.sort(sorted);
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392 sorted2natural = new int[revisionCount];
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393 for (int i = 0; i < revisionCount; i++) {
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394 Nodeid n = sequential[i];
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395 int x = Arrays.binarySearch(sorted, n);
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396 assertSortedIndex(x);
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397 sorted2natural[x] = i;
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398 }
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
399 }
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400
200
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401 private void assertSortedIndex(int x) {
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402 if (x < 0) {
423
9c9c442b5f2e Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
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403 throw new HgInvalidStateException(String.format("Bad index", x));
200
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404 }
29
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diff changeset
405 }
31
346b66add79d Basic lookup for incoming changes
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diff changeset
406
393
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diff changeset
407 /**
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408 * Tells whether supplied revision is from the walker's associated revlog.
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diff changeset
409 * Note, {@link Nodeid#NULL}, although implicitly present as parent of a first revision, is not recognized as known.
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diff changeset
410 * @param nid revision to check, not <code>null</code>
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diff changeset
411 * @return <code>true</code> if revision matches any revision in this revlog
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diff changeset
412 */
31
346b66add79d Basic lookup for incoming changes
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diff changeset
413 public boolean knownNode(Nodeid nid) {
200
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414 return Arrays.binarySearch(sorted, nid) >= 0;
31
346b66add79d Basic lookup for incoming changes
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diff changeset
415 }
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
416
200
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417 /**
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418 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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419 */
29
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420 public Nodeid firstParent(Nodeid nid) {
200
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421 int x = Arrays.binarySearch(sorted, nid);
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422 assertSortedIndex(x);
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423 int i = sorted2natural[x];
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424 return firstParent[i];
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
425 }
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
426
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
427 // never null, Nodeid.NULL if none known
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diff changeset
428 public Nodeid safeFirstParent(Nodeid nid) {
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diff changeset
429 Nodeid rv = firstParent(nid);
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diff changeset
430 return rv == null ? Nodeid.NULL : rv;
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diff changeset
431 }
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
432
6cce719bbb62 Collector for nodes and their parents
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diff changeset
433 public Nodeid secondParent(Nodeid nid) {
200
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434 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
435 assertSortedIndex(x);
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diff changeset
436 int i = sorted2natural[x];
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diff changeset
437 return secondParent[i];
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
438 }
6cce719bbb62 Collector for nodes and their parents
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diff changeset
439
49
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
440 public Nodeid safeSecondParent(Nodeid nid) {
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diff changeset
441 Nodeid rv = secondParent(nid);
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
442 return rv == null ? Nodeid.NULL : rv;
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diff changeset
443 }
26e3eeaa3962 branch and user filtering for log operation
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parents: 39
diff changeset
444
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
445 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
200
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diff changeset
446 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
447 assertSortedIndex(x);
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diff changeset
448 int i = sorted2natural[x];
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diff changeset
449 Nodeid p1 = firstParent[i];
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
450 boolean modified = false;
6cce719bbb62 Collector for nodes and their parents
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diff changeset
451 if (p1 != null) {
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diff changeset
452 modified = c.add(p1);
191
b777502a06f5 Do not assume second parent can be set only when first one is set, again
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diff changeset
453 }
200
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
454 Nodeid p2 = secondParent[i];
191
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diff changeset
455 if (p2 != null) {
b777502a06f5 Do not assume second parent can be set only when first one is set, again
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diff changeset
456 modified = c.add(p2) || modified;
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
457 }
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diff changeset
458 return modified;
6cce719bbb62 Collector for nodes and their parents
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diff changeset
459 }
171
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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diff changeset
460
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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diff changeset
461 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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diff changeset
462 // nodes, their parents and so on.
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diff changeset
463
200
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
464 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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diff changeset
465 // Nodeids shall belong to this revlog
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diff changeset
466 public List<Nodeid> childrenOf(List<Nodeid> roots) {
171
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diff changeset
467 HashSet<Nodeid> parents = new HashSet<Nodeid>();
200
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diff changeset
468 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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diff changeset
469 int earliestRevision = Integer.MAX_VALUE;
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diff changeset
470 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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diff changeset
471 // first, find earliest index of roots in question, as there's no sense
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diff changeset
472 // to check children among nodes prior to branch's root node
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diff changeset
473 for (Nodeid r : roots) {
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
474 int x = Arrays.binarySearch(sorted, r);
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diff changeset
475 assertSortedIndex(x);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
476 int i = sorted2natural[x];
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 197
diff changeset
477 if (i < earliestRevision) {
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
478 earliestRevision = i;
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
479 }
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
480 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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diff changeset
481 }
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diff changeset
482 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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diff changeset
483 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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diff changeset
484 parents.add(sequential[i]); // to find next child
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diff changeset
485 result.add(sequential[i]);
171
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parents: 157
diff changeset
486 }
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
487 }
200
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
488 return result;
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489 }
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490
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491 /**
308
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492 * @return revisions that have supplied revision as their immediate parent
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493 */
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494 public List<Nodeid> directChildren(Nodeid nid) {
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495 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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496 int x = Arrays.binarySearch(sorted, nid);
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497 assertSortedIndex(x);
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498 nid = sorted[x]; // canonical instance
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499 int start = sorted2natural[x];
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500 for (int i = start + 1; i < sequential.length; i++) {
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501 if (nid == firstParent[i] || nid == secondParent[i]) {
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502 result.add(sequential[i]);
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503 }
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504 }
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505 return result;
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506 }
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507
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508 /**
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509 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
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510 * @return <code>true</code> if there's any node in this revlog that has specified node as one of its parents.
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511 */
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512 public boolean hasChildren(Nodeid nid) {
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513 int x = Arrays.binarySearch(sorted, nid);
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514 assertSortedIndex(x);
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515 int i = sorted2natural[x];
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516 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent
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517 assert firstParent.length == sequential.length;
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518 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays.
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519 final Nodeid canonicalNode = sequential[i];
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520 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question
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521 for (; i < sequential.length; i++) {
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522 // TODO [post 1.0] likely, not very effective.
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523 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use,
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524 // however, need to be careful with memory usage
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525 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) {
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526 return true;
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527 }
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528 }
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529 return false;
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530 }
29
6cce719bbb62 Collector for nodes and their parents
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531 }
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532
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533 /**
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534 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of
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535 * multiple {@link Revlog#getRevisionIndex(Nodeid)} calls.
243
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536 *
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537 * {@link Revlog#getRevisionIndex(Nodeid)} with straightforward lookup approach performs O(n/2)
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diff changeset
538 * {@link RevisionMap#revisionIndex(Nodeid)} is log(n), plus initialization is O(n) (just once).
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539 */
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540 public final class RevisionMap implements RevisionInspector {
243
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541 /*
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542 * in fact, initialization is much slower as it instantiates Nodeids, while #getRevisionIndex
243
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543 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171)
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544 * for complete changelog iteration.
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545 */
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546
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547 /*
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548 * XXX 3 * (x * 4) bytes. Can I do better?
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diff changeset
549 * It seems, yes. Don't need to keep sorted, always can emulate it with indirect access to sequential through sorted2natural.
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diff changeset
550 * i.e. instead sorted[mid].compareTo(toFind), do sequential[sorted2natural[mid]].compareTo(toFind)
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551 */
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552 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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553 private Nodeid[] sorted; // for binary search
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554 private int[] sorted2natural;
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555
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556 public RevisionMap() {
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557 }
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558
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559 public HgRepository getRepo() {
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diff changeset
560 return Revlog.this.getRepo();
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diff changeset
561 }
324
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diff changeset
562
367
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diff changeset
563 public void next(int revisionIndex, Nodeid revision, int linkedRevision) {
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diff changeset
564 sequential[revisionIndex] = sorted[revisionIndex] = revision;
324
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diff changeset
565 }
243
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566
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diff changeset
567 /**
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diff changeset
568 * @return <code>this</code> for convenience.
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diff changeset
569 */
366
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diff changeset
570 public RevisionMap init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) throws HgInvalidControlFileException{
243
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571 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed?
324
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572 final int revisionCount = Revlog.this.getRevisionCount();
243
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diff changeset
573 sequential = new Nodeid[revisionCount];
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diff changeset
574 sorted = new Nodeid[revisionCount];
431
12f668401613 FIXMEs: awkward API refactored, what need to be internal got hidden; public aspects got captured in slim interfaces
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diff changeset
575 Revlog.this.indexWalk(0, TIP, this);
307
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diff changeset
576 // next is alternative to Arrays.sort(sorted), and build sorted2natural looking up each element of sequential in sorted.
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diff changeset
577 // the way sorted2natural was build is O(n*log n).
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diff changeset
578 final ArrayHelper ah = new ArrayHelper();
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579 ah.sort(sorted);
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diff changeset
580 // note, values in ArrayHelper#getReversed are 1-based indexes, not 0-based
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diff changeset
581 sorted2natural = ah.getReverse();
243
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diff changeset
582 return this;
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diff changeset
583 }
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584
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diff changeset
585 public Nodeid revision(int revisionIndex) {
2fadf8695f8a Use 'revision index' instead of the vague 'local revision number' concept in the API
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diff changeset
586 return sequential[revisionIndex];
243
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587 }
367
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diff changeset
588 public int revisionIndex(Nodeid revision) {
274
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diff changeset
589 if (revision == null || revision.isNull()) {
243
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diff changeset
590 return BAD_REVISION;
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diff changeset
591 }
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diff changeset
592 int x = Arrays.binarySearch(sorted, revision);
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diff changeset
593 if (x < 0) {
0e01f9182e16 External cache Nodeid<->int added, Revlog.RevisionMap
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diff changeset
594 return BAD_REVISION;
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diff changeset
595 }
307
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diff changeset
596 return sorted2natural[x]-1;
243
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diff changeset
597 }
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diff changeset
598 }
0e01f9182e16 External cache Nodeid<->int added, Revlog.RevisionMap
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diff changeset
599
277
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diff changeset
600 protected abstract static class ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
157
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diff changeset
601 private Exception failure;
277
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diff changeset
602 private CancelSupport cancelSupport;
157
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diff changeset
603
277
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diff changeset
604 protected void setCancelSupport(CancelSupport cs) {
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diff changeset
605 assert cancelSupport == null; // no reason to set it twice
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diff changeset
606 cancelSupport = cs;
157
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diff changeset
607 }
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
608
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
609 protected void recordFailure(Exception ex) {
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610 assert failure == null;
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611 failure = ex;
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612 }
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613
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614 public void checkFailed() throws HgRuntimeException, IOException, CancelledException {
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615 if (failure == null) {
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616 return;
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617 }
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618 if (failure instanceof IOException) {
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619 throw (IOException) failure;
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620 }
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621 if (failure instanceof CancelledException) {
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622 throw (CancelledException) failure;
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623 }
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624 if (failure instanceof HgRuntimeException) {
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625 throw (HgRuntimeException) failure;
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626 }
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627 throw new HgInvalidStateException(failure.toString());
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628 }
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629
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630 public void checkCancelled() throws CancelledException {
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631 if (cancelSupport != null) {
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632 cancelSupport.checkCancelled();
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633 }
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634 }
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635 }
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636
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637 protected static class ContentPipe extends ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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638 private final ByteChannel sink;
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639 private final int offset;
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640 private final LogFacility logFacility;
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641
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642 /**
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643 * @param _sink - cannot be <code>null</code>
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644 * @param seekOffset - when positive, orders to pipe bytes to the sink starting from specified offset, not from the first byte available in DataAccess
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645 * @param log optional facility to put warnings/debug messages into, may be null.
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646 */
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647 public ContentPipe(ByteChannel _sink, int seekOffset, LogFacility log) {
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648 assert _sink != null;
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649 sink = _sink;
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650 setCancelSupport(CancelSupport.Factory.get(_sink));
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651 offset = seekOffset;
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652 logFacility = log;
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653 }
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654
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655 protected void prepare(int revisionNumber, DataAccess da) throws IOException {
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656 if (offset > 0) { // save few useless reset/rewind operations
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657 da.seek(offset);
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658 }
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659 }
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660
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661 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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662 try {
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663 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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664 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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665 ByteBuffer buf = ByteBuffer.allocate(actualLen > 8192 ? 8192 : actualLen);
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666 Preview p = Adaptable.Factory.getAdapter(sink, Preview.class, null);
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667 if (p != null) {
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668 progressSupport.start(2 * da.length());
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669 while (!da.isEmpty()) {
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670 checkCancelled();
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671 da.readBytes(buf);
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672 p.preview(buf);
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673 buf.clear();
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674 }
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675 da.reset();
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676 prepare(revisionNumber, da);
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677 progressSupport.worked(da.length());
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678 buf.clear();
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679 } else {
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680 progressSupport.start(da.length());
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681 }
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682 while (!da.isEmpty()) {
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683 checkCancelled();
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684 da.readBytes(buf);
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685 buf.flip(); // post: position == 0
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686 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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687
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688 int consumed = sink.write(buf);
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689 if ((consumed == 0 || consumed != buf.position()) && logFacility != null) {
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690 logFacility.warn(getClass(), "Bad data sink when reading revision %d. Reported %d bytes consumed, byt actually read %d", revisionNumber, consumed, buf.position());
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691 }
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692 if (buf.position() == 0) {
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693 throw new HgInvalidStateException("Bad sink implementation (consumes no bytes) results in endless loop");
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694 }
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695 buf.compact(); // ensure (a) there's space for new (b) data starts at 0
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696 progressSupport.worked(consumed);
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697 }
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698 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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699 } catch (IOException ex) {
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700 recordFailure(ex);
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701 } catch (CancelledException ex) {
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702 recordFailure(ex);
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703 }
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704 }
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705 }
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706 }