annotate src/org/tmatesoft/hg/repo/Revlog.java @ 433:be697c3e951e

Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 30 Mar 2012 16:43:09 +0200
parents 1fc0da631200
children 32184ddcf46d
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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20
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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.List;
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6cce719bbb62 Collector for nodes and their parents
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.internal.DataAccess;
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29 import org.tmatesoft.hg.internal.Experimental;
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30 import org.tmatesoft.hg.internal.Preview;
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31 import org.tmatesoft.hg.internal.RevlogStream;
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32 import org.tmatesoft.hg.util.Adaptable;
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33 import org.tmatesoft.hg.util.ByteChannel;
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34 import org.tmatesoft.hg.util.CancelSupport;
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35 import org.tmatesoft.hg.util.CancelledException;
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36 import org.tmatesoft.hg.util.LogFacility;
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37 import org.tmatesoft.hg.util.ProgressSupport;
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39
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40 /**
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41 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files).
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42 *
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43 * Implementation note:
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44 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal
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45 * in public methods.
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46 *
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47 * @author Artem Tikhomirov
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48 * @author TMate Software Ltd.
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49 */
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50 abstract class Revlog {
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51
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52 private final HgRepository repo;
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53 protected final RevlogStream content;
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54
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55 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) {
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56 if (hgRepo == null) {
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57 throw new IllegalArgumentException();
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58 }
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59 if (contentStream == null) {
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60 throw new IllegalArgumentException();
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61 }
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62 repo = hgRepo;
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63 content = contentStream;
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64 }
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66 // invalid Revlog
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67 protected Revlog(HgRepository hgRepo) {
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68 repo = hgRepo;
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69 content = null;
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70 }
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72 public final HgRepository getRepo() {
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73 return repo;
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74 }
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76 /**
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77 * @return total number of revisions kept in this revlog
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78 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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79 */
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80 public final int getRevisionCount() throws HgRuntimeException {
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81 return content.revisionCount();
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82 }
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83
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84 /**
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85 * @return index of last known revision, a.k.a. {@link HgRepository#TIP}
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86 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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87 */
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88 public final int getLastRevision() throws HgRuntimeException {
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89 return content.revisionCount() - 1;
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90 }
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92 /**
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93 * Map revision index to unique revision identifier (nodeid).
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94 *
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95 * @param revision index of the entry in this revlog, may be {@link HgRepository#TIP}
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96 * @return revision nodeid of the entry
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97 *
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98 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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99 */
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100 public final Nodeid getRevision(int revision) throws HgRuntimeException {
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101 // XXX cache nodeids? Rather, if context.getCache(this).getRevisionMap(create == false) != null, use it
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102 return Nodeid.fromBinary(content.nodeid(revision), 0);
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103 }
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104
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105 /**
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106 * Effective alternative to map few revision indexes to corresponding nodeids at once.
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107 * <p>Note, there are few aspects to be careful about when using this method<ul>
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108 * <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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109 * <li>supplied array get modified (sorted)</ul>
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110 * @return list of mapped revisions in no particular order
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111 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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112 */
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113 public final List<Nodeid> getRevisions(int... revisions) throws HgRuntimeException {
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114 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(revisions.length);
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115 Arrays.sort(revisions);
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116 getRevisionsInternal(rv, revisions);
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117 return rv;
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118 }
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119
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120 /*package-local*/ void getRevisionsInternal(final List<Nodeid> retVal, int[] sortedRevs) throws HgInvalidRevisionException, HgInvalidControlFileException {
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121 // once I have getRevisionMap and may find out whether it is avalable from cache,
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122 // may use it, perhaps only for small number of revisions
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123 content.iterate(sortedRevs, false, new RevlogStream.Inspector() {
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124
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125 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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126 retVal.add(Nodeid.fromBinary(nodeid, 0));
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127 }
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128 });
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129 }
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130
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131 /**
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132 * Get local index of the specified revision.
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133 * If unsure, use {@link #isKnown(Nodeid)} to find out whether nodeid belongs to this revlog.
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134 *
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135 * For occasional queries, this method works with decent performance, despite its O(n/2) approach.
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136 * Alternatively, if you need to perform multiple queries (e.g. at least 15-20), {@link HgRevisionMap} may come handy.
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137 *
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138 * @param nid revision to look up
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139 * @return revision local index in this revlog
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140 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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141 */
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142 public final int getRevisionIndex(Nodeid nid) throws HgRuntimeException {
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143 int revision = content.findRevisionIndex(nid);
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144 if (revision == BAD_REVISION) {
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145 // using toString() to identify revlog. HgDataFile.toString includes path, HgManifest and HgChangelog instances
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146 // are fine with default (class name)
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147 // Perhaps, more tailored description method would be suitable here
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148 throw new HgInvalidRevisionException(String.format("Can't find revision %s in %s", nid.shortNotation(), this), nid, null);
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149 }
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150 return revision;
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151 }
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152
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153 /**
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154 * Note, {@link Nodeid#NULL} nodeid is not reported as known in any revlog.
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155 *
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156 * @param nodeid
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157 * @return <code>true</code> if revision is part of this revlog
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158 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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159 */
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160 public final boolean isKnown(Nodeid nodeid) throws HgRuntimeException {
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161 final int rn = content.findRevisionIndex(nodeid);
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162 if (BAD_REVISION == rn) {
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163 return false;
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164 }
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165 if (rn < 0 || rn >= content.revisionCount()) {
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166 // Sanity check
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167 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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168 }
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169 return true;
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170 }
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171
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172 /**
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173 * Access to revision data as is, equivalent to <code>rawContent(getRevisionIndex(nodeid), sink)</code>
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174 *
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175 * @param nodeid revision to retrieve
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176 * @param sink data destination
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177 *
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178 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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179 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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180 * @throws CancelledException if content retrieval operation was cancelled
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181 *
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182 * @see #rawContent(int, ByteChannel)
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183 */
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184 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException {
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185 rawContent(getRevisionIndex(nodeid), sink);
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186 }
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187
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188 /**
394
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189 * 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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190 *
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191 * @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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192 * @param sink data destination
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193 *
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194 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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195 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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196 * @throws CancelledException if content retrieval operation was cancelled
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197 */
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198 protected void rawContent(int revisionIndex, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException {
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199 if (sink == null) {
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200 throw new IllegalArgumentException();
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201 }
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202 try {
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203 ContentPipe insp = new ContentPipe(sink, 0, repo.getContext().getLog());
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204 insp.checkCancelled();
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205 content.iterate(revisionIndex, revisionIndex, true, insp);
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206 insp.checkFailed();
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207 } catch (IOException ex) {
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208 HgInvalidControlFileException e = new HgInvalidControlFileException(String.format("Access to revision %d content failed", revisionIndex), ex, null);
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209 e.setRevisionIndex(revisionIndex);
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210 // TODO post 1.0 e.setFileName(content.getIndexFile() or this.getHumanFriendlyPath()) - shall decide whether
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211 // protected abstract getHFPath() with impl in HgDataFile, HgManifest and HgChangelog or path is data of either Revlog or RevlogStream
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212 // Do the same (add file name) below
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213 throw e;
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214 } catch (HgInvalidControlFileException ex) {
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215 throw ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(revisionIndex);
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216 }
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217 }
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218
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219 /**
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220 * Fills supplied arguments with information about revision parents.
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221 *
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222 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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223 * @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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224 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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225 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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226 * @throws IllegalArgumentException if passed arrays can't fit requested data
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227 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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228 */
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229 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) throws HgRuntimeException, IllegalArgumentException {
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230 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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231 throw new HgInvalidRevisionException(revision);
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232 }
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233 if (parentRevisions == null || parentRevisions.length < 2) {
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234 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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235 }
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236 if (parent1 != null && parent1.length < 20) {
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237 throw new IllegalArgumentException(parent1.toString());
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238 }
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239 if (parent2 != null && parent2.length < 20) {
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240 throw new IllegalArgumentException(parent2.toString());
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241 }
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242 class ParentCollector implements RevlogStream.Inspector {
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243 public int p1 = -1;
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244 public int p2 = -1;
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245 public byte[] nodeid;
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246
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247 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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248 p1 = parent1Revision;
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249 p2 = parent2Revision;
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250 this.nodeid = new byte[20];
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251 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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252 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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253 }
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254 };
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255 ParentCollector pc = new ParentCollector();
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256 content.iterate(revision, revision, false, pc);
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257 // although next code looks odd (NO_REVISION *is* -1), it's safer to be explicit
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258 parentRevisions[0] = pc.p1 == -1 ? NO_REVISION : pc.p1;
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259 parentRevisions[1] = pc.p2 == -1 ? NO_REVISION : pc.p2;
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260 if (parent1 != null) {
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261 if (parentRevisions[0] == NO_REVISION) {
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262 Arrays.fill(parent1, 0, 20, (byte) 0);
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263 } else {
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264 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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265 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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266 }
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267 }
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268 if (parent2 != null) {
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269 if (parentRevisions[1] == NO_REVISION) {
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270 Arrays.fill(parent2, 0, 20, (byte) 0);
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271 } else {
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272 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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273 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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274 }
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275 }
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276 }
425
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277
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278 /**
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279 * EXPERIMENTAL CODE, DO NOT USE
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280 *
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281 * Alternative revlog iteration
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282 *
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283 * @param start
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284 * @param end
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285 * @param inspector
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286 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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287 */
324
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288 @Experimental
431
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289 public void indexWalk(int start, int end, final Revlog.Inspector inspector) throws HgRuntimeException {
324
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290 int lastRev = getLastRevision();
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291 if (start == TIP) {
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292 start = lastRev;
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293 }
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294 if (end == TIP) {
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295 end = lastRev;
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296 }
356
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297 final RevisionInspector revisionInsp = Adaptable.Factory.getAdapter(inspector, RevisionInspector.class, null);
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298 final ParentInspector parentInsp = Adaptable.Factory.getAdapter(inspector, ParentInspector.class, null);
324
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299 final Nodeid[] allRevisions = parentInsp == null ? null : new Nodeid[end - start + 1];
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300
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301 content.iterate(start, end, false, new RevlogStream.Inspector() {
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302
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303 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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304 Nodeid nid = Nodeid.fromBinary(nodeid, 0);
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305 if (revisionInsp != null) {
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306 revisionInsp.next(revisionNumber, nid, linkRevision);
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307 }
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308 if (parentInsp != null) {
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309 Nodeid p1 = parent1Revision == -1 ? Nodeid.NULL : allRevisions[parent1Revision];
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310 Nodeid p2 = parent2Revision == -1 ? Nodeid.NULL : allRevisions[parent2Revision];
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311 allRevisions[revisionNumber] = nid;
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312 parentInsp.next(revisionNumber, nid, parent1Revision, parent2Revision, p1, p2);
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313 }
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314 }
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315 });
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316 }
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317
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318 /**
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319 * MARKER
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320 */
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321 @Experimental
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322 public interface Inspector {
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323 }
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324
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325 @Experimental
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326 public interface RevisionInspector extends Inspector {
368
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327 void next(int revisionIndex, Nodeid revision, int linkedRevisionIndex);
324
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328 }
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329
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330 @Experimental
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331 public interface ParentInspector extends Inspector {
327
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332 // XXX document whether parentX is -1 or a constant (BAD_REVISION? or dedicated?)
367
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333 void next(int revisionIndex, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2);
324
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334 }
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335
432
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336 protected HgParentChildMap<? extends Revlog> getParentWalker() {
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337 HgParentChildMap<Revlog> pw = new HgParentChildMap<Revlog>(this);
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338 pw.init();
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339 return pw;
29
6cce719bbb62 Collector for nodes and their parents
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340 }
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341
433
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342 /*
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343 * class with cancel and few other exceptions support. TODO consider general superclass to share with e.g. HgManifestCommand.Mediator
243
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344 */
277
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345 protected abstract static class ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
157
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346 private Exception failure;
277
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347 private CancelSupport cancelSupport;
157
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348
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349 protected void setCancelSupport(CancelSupport cs) {
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350 assert cancelSupport == null; // no reason to set it twice
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351 cancelSupport = cs;
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352 }
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353
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354 protected void recordFailure(Exception ex) {
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355 assert failure == null;
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356 failure = ex;
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357 }
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358
425
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359 public void checkFailed() throws HgRuntimeException, IOException, CancelledException {
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360 if (failure == null) {
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361 return;
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362 }
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363 if (failure instanceof IOException) {
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364 throw (IOException) failure;
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365 }
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366 if (failure instanceof CancelledException) {
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367 throw (CancelledException) failure;
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368 }
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369 if (failure instanceof HgRuntimeException) {
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370 throw (HgRuntimeException) failure;
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371 }
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372 throw new HgInvalidStateException(failure.toString());
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373 }
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374
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375 public void checkCancelled() throws CancelledException {
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376 if (cancelSupport != null) {
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377 cancelSupport.checkCancelled();
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378 }
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379 }
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380 }
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381
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382 protected static class ContentPipe extends ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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383 private final ByteChannel sink;
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384 private final int offset;
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385 private final LogFacility logFacility;
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386
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387 /**
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388 * @param _sink - cannot be <code>null</code>
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389 * @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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390 * @param log optional facility to put warnings/debug messages into, may be null.
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391 */
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392 public ContentPipe(ByteChannel _sink, int seekOffset, LogFacility log) {
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393 assert _sink != null;
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394 sink = _sink;
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395 setCancelSupport(CancelSupport.Factory.get(_sink));
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396 offset = seekOffset;
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397 logFacility = log;
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398 }
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399
425
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400 protected void prepare(int revisionNumber, DataAccess da) throws IOException {
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401 if (offset > 0) { // save few useless reset/rewind operations
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402 da.seek(offset);
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403 }
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404 }
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405
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406 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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407 try {
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408 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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409 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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410 ByteBuffer buf = ByteBuffer.allocate(actualLen > 8192 ? 8192 : actualLen);
356
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411 Preview p = Adaptable.Factory.getAdapter(sink, Preview.class, null);
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412 if (p != null) {
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413 progressSupport.start(2 * da.length());
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414 while (!da.isEmpty()) {
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415 checkCancelled();
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416 da.readBytes(buf);
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417 p.preview(buf);
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418 buf.clear();
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419 }
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420 da.reset();
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421 prepare(revisionNumber, da);
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422 progressSupport.worked(da.length());
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423 buf.clear();
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424 } else {
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425 progressSupport.start(da.length());
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426 }
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427 while (!da.isEmpty()) {
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428 checkCancelled();
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429 da.readBytes(buf);
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430 buf.flip(); // post: position == 0
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431 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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432
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433 int consumed = sink.write(buf);
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434 if ((consumed == 0 || consumed != buf.position()) && logFacility != null) {
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435 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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436 }
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437 if (buf.position() == 0) {
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438 throw new HgInvalidStateException("Bad sink implementation (consumes no bytes) results in endless loop");
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439 }
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440 buf.compact(); // ensure (a) there's space for new (b) data starts at 0
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441 progressSupport.worked(consumed);
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442 }
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443 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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444 } catch (IOException ex) {
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445 recordFailure(ex);
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446 } catch (CancelledException ex) {
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447 recordFailure(ex);
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448 }
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449 }
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450 }
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451 }