Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/Revlog.java @ 255:5a6ab50b4cbf

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Improve memory footprint of tag collection (about 14 Mb saved for cpython repo without HashMap.Entry and Entry[])
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Aug 2011 14:33:11 +0200
parents 0e01f9182e16
children 9fb50c04f03c
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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19 import static org.tmatesoft.hg.core.Nodeid.NULL;
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20 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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21 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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23 import java.io.IOException;
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24 import java.nio.ByteBuffer;
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25 import java.util.Arrays;
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26 import java.util.Collection;
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27 import java.util.HashSet;
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28 import java.util.LinkedList;
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29 import java.util.List;
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31 import org.tmatesoft.hg.core.HgBadStateException;
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32 import org.tmatesoft.hg.core.HgException;
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33 import org.tmatesoft.hg.core.Nodeid;
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34 import org.tmatesoft.hg.internal.DataAccess;
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35 import org.tmatesoft.hg.internal.RevlogStream;
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36 import org.tmatesoft.hg.util.ByteChannel;
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37 import org.tmatesoft.hg.util.CancelSupport;
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38 import org.tmatesoft.hg.util.CancelledException;
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39 import org.tmatesoft.hg.util.ProgressSupport;
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41
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42 /**
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43 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files).
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44 *
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45 * Implementation note:
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46 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal
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47 * in public methods.
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48 *
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49 * @author Artem Tikhomirov
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50 * @author TMate Software Ltd.
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51 */
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52 abstract class Revlog {
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54 private final HgRepository repo;
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55 protected final RevlogStream content;
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57 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) {
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58 if (hgRepo == null) {
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59 throw new IllegalArgumentException();
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60 }
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61 if (contentStream == null) {
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62 throw new IllegalArgumentException();
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63 }
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64 repo = hgRepo;
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65 content = contentStream;
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66 }
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68 // invalid Revlog
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69 protected Revlog(HgRepository hgRepo) {
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70 repo = hgRepo;
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71 content = null;
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72 }
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74 public final HgRepository getRepo() {
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75 return repo;
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76 }
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78 public final int getRevisionCount() {
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79 return content.revisionCount();
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80 }
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82 public final int getLastRevision() {
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83 return content.revisionCount() - 1;
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84 }
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85
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86 public final Nodeid getRevision(int revision) {
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87 // XXX cache nodeids?
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88 return Nodeid.fromBinary(content.nodeid(revision), 0);
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89 }
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90
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91 /**
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92 * Get local revision number (index) of the specified revision.
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93 *
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94 * For occasional queries, this method works with decent performance, despite its O(n/2) approach.
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95 * Alternatively, if you need to perform multiple queries (e.g. at least 15-20), {@link RevisionMap} may come handy.
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96 *
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97 * @param nid revision to look up
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98 * @return revision index, or {@link HgRepository#BAD_REVISION} if specified revision not found.
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99 */
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100 public final int getLocalRevision(Nodeid nid) {
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101 int revision = content.findLocalRevisionNumber(nid);
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102 if (revision == BAD_REVISION) {
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103 throw new IllegalArgumentException(String.format("%s doesn't represent a revision of %s", nid.toString(), this /*XXX HgDataFile.getPath might be more suitable here*/));
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104 }
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105 return revision;
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106 }
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107
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108 // Till now, i follow approach that NULL nodeid is never part of revlog
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109 public final boolean isKnown(Nodeid nodeid) {
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110 final int rn = content.findLocalRevisionNumber(nodeid);
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111 if (BAD_REVISION == rn) {
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112 return false;
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113 }
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114 if (rn < 0 || rn >= content.revisionCount()) {
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115 // Sanity check
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116 throw new IllegalStateException();
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117 }
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118 return true;
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119 }
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120
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121 /**
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122 * 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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123 * @param nodeid
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124 */
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125 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgException, IOException, CancelledException {
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126 rawContent(getLocalRevision(nodeid), sink);
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127 }
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128
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129 /**
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130 * @param revision - repo-local index of this file change (not a changelog revision number!)
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131 */
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132 protected void rawContent(int revision, ByteChannel sink) throws HgException, IOException, CancelledException {
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133 if (sink == null) {
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134 throw new IllegalArgumentException();
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135 }
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136 ContentPipe insp = new ContentPipe(sink, 0);
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137 insp.checkCancelled();
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138 content.iterate(revision, revision, true, insp);
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139 insp.checkFailed();
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140 }
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141
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142 /**
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143 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query?
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144 *
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145 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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146 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1})
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147 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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148 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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149 * @return
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150 */
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151 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) {
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152 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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153 throw new IllegalArgumentException(String.valueOf(revision));
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154 }
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155 if (parentRevisions == null || parentRevisions.length < 2) {
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156 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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157 }
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158 if (parent1 != null && parent1.length < 20) {
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159 throw new IllegalArgumentException(parent1.toString());
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160 }
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161 if (parent2 != null && parent2.length < 20) {
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162 throw new IllegalArgumentException(parent2.toString());
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163 }
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164 class ParentCollector implements RevlogStream.Inspector {
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165 public int p1 = -1;
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166 public int p2 = -1;
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167 public byte[] nodeid;
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168
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169 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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170 p1 = parent1Revision;
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171 p2 = parent2Revision;
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172 this.nodeid = new byte[20];
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173 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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174 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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175 }
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176 };
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177 ParentCollector pc = new ParentCollector();
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178 content.iterate(revision, revision, false, pc);
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179 parentRevisions[0] = pc.p1;
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180 parentRevisions[1] = pc.p2;
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181 if (parent1 != null) {
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182 if (parentRevisions[0] == -1) {
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183 Arrays.fill(parent1, 0, 20, (byte) 0);
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184 } else {
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185 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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186 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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187 }
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188 }
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189 if (parent2 != null) {
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190 if (parentRevisions[1] == -1) {
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191 Arrays.fill(parent2, 0, 20, (byte) 0);
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192 } else {
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193 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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194 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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195 }
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196 }
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197 }
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198
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199 /*
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200 * XXX think over if it's better to do either:
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201 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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202 * or
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203 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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204 *
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205 * and yes, walker is not a proper name
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206 */
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207 public final class ParentWalker {
200
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208
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209
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210 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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211 private Nodeid[] sorted; // for binary search
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212 private int[] sorted2natural;
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213 private Nodeid[] firstParent;
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214 private Nodeid[] secondParent;
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215
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216 // Nodeid instances shall be shared between all arrays
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217
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218 public ParentWalker() {
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219 }
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220
192
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221 public HgRepository getRepo() {
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222 return Revlog.this.getRepo();
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223 }
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224
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225 public void init() {
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226 final RevlogStream stream = Revlog.this.content;
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227 final int revisionCount = stream.revisionCount();
200
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228 firstParent = new Nodeid[revisionCount];
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229 // although branches/merges are less frequent, and most of secondParent would be -1/null, some sort of
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230 // SparseOrderedList might be handy, provided its inner structures do not overweight simplicity of an array
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231 secondParent = new Nodeid[revisionCount];
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232 //
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233 sequential = new Nodeid[revisionCount];
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234 sorted = new Nodeid[revisionCount];
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235
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236 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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237
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238 int ix = 0;
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diff changeset
239 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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240 if (ix != revisionNumber) {
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241 // XXX temp code, just to make sure I understand what's going on here
243
0e01f9182e16 External cache Nodeid<->int added, Revlog.RevisionMap
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242 // FIXME check against cpython or another tool-mangled repository
29
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243 throw new IllegalStateException();
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244 }
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245 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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246 throw new IllegalStateException(); // sanity, revisions are sequential
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247 }
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248 final Nodeid nid = new Nodeid(nodeid, true);
200
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249 sequential[ix] = sorted[ix] = nid;
29
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250 if (parent1Revision != -1) {
200
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251 assert parent1Revision < ix;
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252 firstParent[ix] = sequential[parent1Revision];
183
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253 }
200
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254 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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255 assert parent2Revision < ix;
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256 secondParent[ix] = sequential[parent2Revision];
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257 }
200
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258 ix++;
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259 }
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260 };
197
3a7696fb457c Investigate optimization options to allow fast processing of huge repositories. Fix defect in StatusCollector that lead to wrong result comparing first revision to empty repo (-1 to 0), due to same TIP constant value
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261 stream.iterate(0, TIP, false, insp);
200
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262 Arrays.sort(sorted);
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263 sorted2natural = new int[revisionCount];
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264 for (int i = 0; i < revisionCount; i++) {
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265 Nodeid n = sequential[i];
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266 int x = Arrays.binarySearch(sorted, n);
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267 assertSortedIndex(x);
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268 sorted2natural[x] = i;
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269 }
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270 }
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271
200
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272 private void assertSortedIndex(int x) {
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273 if (x < 0) {
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274 throw new HgBadStateException();
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275 }
29
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276 }
31
346b66add79d Basic lookup for incoming changes
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277
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278 // FIXME need to decide whether Nodeid(00 * 20) is always known or not
200
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279 // right now Nodeid.NULL is not recognized as known if passed to this method,
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280 // caller is supposed to make explicit check
31
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281 public boolean knownNode(Nodeid nid) {
200
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282 return Arrays.binarySearch(sorted, nid) >= 0;
31
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283 }
29
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284
200
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285 /**
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286 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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287 */
29
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288 public Nodeid firstParent(Nodeid nid) {
200
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289 int x = Arrays.binarySearch(sorted, nid);
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290 assertSortedIndex(x);
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291 int i = sorted2natural[x];
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292 return firstParent[i];
29
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293 }
49
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294
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295 // never null, Nodeid.NULL if none known
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296 public Nodeid safeFirstParent(Nodeid nid) {
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297 Nodeid rv = firstParent(nid);
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298 return rv == null ? Nodeid.NULL : rv;
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299 }
29
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300
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301 public Nodeid secondParent(Nodeid nid) {
200
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302 int x = Arrays.binarySearch(sorted, nid);
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303 assertSortedIndex(x);
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304 int i = sorted2natural[x];
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305 return secondParent[i];
29
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diff changeset
306 }
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307
49
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308 public Nodeid safeSecondParent(Nodeid nid) {
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309 Nodeid rv = secondParent(nid);
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310 return rv == null ? Nodeid.NULL : rv;
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311 }
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312
29
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313 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
200
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314 int x = Arrays.binarySearch(sorted, nid);
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315 assertSortedIndex(x);
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316 int i = sorted2natural[x];
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317 Nodeid p1 = firstParent[i];
29
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diff changeset
318 boolean modified = false;
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319 if (p1 != null) {
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320 modified = c.add(p1);
191
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diff changeset
321 }
200
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322 Nodeid p2 = secondParent[i];
191
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diff changeset
323 if (p2 != null) {
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diff changeset
324 modified = c.add(p2) || modified;
29
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diff changeset
325 }
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diff changeset
326 return modified;
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diff changeset
327 }
171
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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diff changeset
328
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diff changeset
329 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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diff changeset
330 // nodes, their parents and so on.
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diff changeset
331
200
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diff changeset
332 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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diff changeset
333 // Nodeids shall belong to this revlog
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diff changeset
334 public List<Nodeid> childrenOf(List<Nodeid> roots) {
171
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diff changeset
335 HashSet<Nodeid> parents = new HashSet<Nodeid>();
200
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diff changeset
336 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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diff changeset
337 int earliestRevision = Integer.MAX_VALUE;
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diff changeset
338 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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diff changeset
339 // first, find earliest index of roots in question, as there's no sense
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diff changeset
340 // to check children among nodes prior to branch's root node
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diff changeset
341 for (Nodeid r : roots) {
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diff changeset
342 int x = Arrays.binarySearch(sorted, r);
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diff changeset
343 assertSortedIndex(x);
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diff changeset
344 int i = sorted2natural[x];
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diff changeset
345 if (i < earliestRevision) {
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diff changeset
346 earliestRevision = i;
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diff changeset
347 }
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diff changeset
348 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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diff changeset
349 }
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diff changeset
350 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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diff changeset
351 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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diff changeset
352 parents.add(sequential[i]); // to find next child
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diff changeset
353 result.add(sequential[i]);
171
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354 }
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diff changeset
355 }
200
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diff changeset
356 return result;
171
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diff changeset
357 }
192
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diff changeset
358
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diff changeset
359 /**
200
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diff changeset
360 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
192
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diff changeset
361 * @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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diff changeset
362 */
200
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diff changeset
363 public boolean hasChildren(Nodeid nid) {
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diff changeset
364 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
365 assertSortedIndex(x);
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diff changeset
366 int i = sorted2natural[x];
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diff changeset
367 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent
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368 assert firstParent.length == sequential.length;
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369 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays.
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370 final Nodeid canonicalNode = sequential[i];
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371 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question
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372 for (; i < sequential.length; i++) {
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373 // FIXME likely, not very effective.
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374 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use,
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375 // however, need to be careful with memory usage
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376 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) {
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377 return true;
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378 }
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379 }
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380 return false;
192
e5407b5a586a Incoming and Outgoing commands are alive
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381 }
29
6cce719bbb62 Collector for nodes and their parents
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382 }
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383
243
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384 /**
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385 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of
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386 * multiple {@link Revlog#getLocalRevision(Nodeid)} calls.
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387 *
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388 * getLocalRevision(Nodeid) with straightforward lookup approach performs O(n/2)
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389 * #localRevision() is log(n), plus initialization is O(n)
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390 */
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391 public final class RevisionMap {
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392 /*
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393 * in fact, initialization is much slower as it instantiates Nodeids, while #getLocalRevision
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394 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171)
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395 * for complete changelog iteration.
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396 */
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397
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398 /*
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399 * XXX 3 * (x * 4) bytes. Can I do better?
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400 */
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401 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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402 private Nodeid[] sorted; // for binary search
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403 private int[] sorted2natural;
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404
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405 public RevisionMap() {
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406 }
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407
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408 public HgRepository getRepo() {
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409 return Revlog.this.getRepo();
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410 }
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411
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412 /**
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413 * @return <code>this</code> for convenience.
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414 */
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415 public RevisionMap init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) {
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416 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed?
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417 final int revisionCount = Revlog.this.content.revisionCount();
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418 sequential = new Nodeid[revisionCount];
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419 sorted = new Nodeid[revisionCount];
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420 sorted2natural = new int[revisionCount];
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421 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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422
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423 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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424 final Nodeid nid = new Nodeid(nodeid, true);
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425 sequential[revisionNumber] = sorted[revisionNumber] = nid;
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426 }
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427 };
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428 Revlog.this.content.iterate(0, TIP, false, insp);
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429 Arrays.sort(sorted);
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430 for (int i = 0; i < revisionCount; i++) {
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431 Nodeid n = sequential[i];
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432 int x = Arrays.binarySearch(sorted, n);
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433 sorted2natural[x] = i;
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434 }
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435 return this;
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436 }
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437
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438 public Nodeid revision(int localRevision) {
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439 return sequential[localRevision];
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440 }
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441 public int localRevision(Nodeid revision) {
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442 if (revision == null || NULL.equals(revision)) {
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443 return BAD_REVISION;
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444 }
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445 int x = Arrays.binarySearch(sorted, revision);
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446 if (x < 0) {
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447 return BAD_REVISION;
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448 }
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449 return sorted2natural[x];
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450 }
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451 }
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452
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453
157
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454 protected static class ContentPipe implements RevlogStream.Inspector, CancelSupport {
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455 private final ByteChannel sink;
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456 private final CancelSupport cancelSupport;
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457 private Exception failure;
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458 private final int offset;
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459
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460 /**
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461 * @param _sink - cannot be <code>null</code>
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462 * @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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463 */
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464 public ContentPipe(ByteChannel _sink, int seekOffset) {
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465 assert _sink != null;
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466 sink = _sink;
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467 cancelSupport = CancelSupport.Factory.get(_sink);
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468 offset = seekOffset;
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469 }
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470
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471 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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472 if (offset > 0) { // save few useless reset/rewind operations
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473 da.seek(offset);
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474 }
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475 }
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476
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477 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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478 try {
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479 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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480 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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481 ByteBuffer buf = ByteBuffer.allocate(512);
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482 progressSupport.start(da.length());
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483 while (!da.isEmpty()) {
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484 cancelSupport.checkCancelled();
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485 da.readBytes(buf);
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486 buf.flip();
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487 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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488 int consumed = sink.write(buf);
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489 // FIXME in fact, bad sink implementation (that consumes no bytes) would result in endless loop. Need to account for this
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490 buf.compact();
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491 progressSupport.worked(consumed);
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492 }
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493 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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494 } catch (IOException ex) {
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495 recordFailure(ex);
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496 } catch (CancelledException ex) {
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497 recordFailure(ex);
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498 } catch (HgException ex) {
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499 recordFailure(ex);
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500 }
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501 }
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502
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503 public void checkCancelled() throws CancelledException {
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504 cancelSupport.checkCancelled();
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505 }
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506
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507 protected void recordFailure(Exception ex) {
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508 assert failure == null;
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509 failure = ex;
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510 }
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511
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512 public void checkFailed() throws HgException, IOException, CancelledException {
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513 if (failure == null) {
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514 return;
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515 }
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516 if (failure instanceof IOException) {
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517 throw (IOException) failure;
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518 }
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519 if (failure instanceof CancelledException) {
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520 throw (CancelledException) failure;
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521 }
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522 if (failure instanceof HgException) {
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523 throw (HgException) failure;
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524 }
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525 throw new HgBadStateException(failure);
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526 }
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527 }
2
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528 }