Mercurial > jhg
annotate src/org/tmatesoft/hg/repo/Revlog.java @ 599:55b7987c1796
Do not instantiate intermediate arrays
| author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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| date | Fri, 03 May 2013 15:29:26 +0200 |
| parents | dd4f6311af52 |
| children | 46f29b73e51e |
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1 /* |
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2 * Copyright (c) 2010-2013 TMate Software Ltd |
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3 * |
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4 * This program is free software; you can redistribute it and/or modify |
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5 * it under the terms of the GNU General Public License as published by |
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6 * the Free Software Foundation; version 2 of the License. |
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7 * |
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8 * This program is distributed in the hope that it will be useful, |
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 * GNU General Public License for more details. |
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12 * |
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13 * For information on how to redistribute this software under |
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14 * the terms of a license other than GNU General Public License |
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15 * contact TMate Software at support@hg4j.com |
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16 */ |
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17 package org.tmatesoft.hg.repo; |
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18 |
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19 import static org.tmatesoft.hg.repo.HgRepository.*; |
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20 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn; |
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21 |
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22 import java.io.IOException; |
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23 import java.nio.ByteBuffer; |
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24 import java.util.ArrayList; |
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25 import java.util.Arrays; |
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26 import java.util.List; |
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27 |
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28 import org.tmatesoft.hg.core.Nodeid; |
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29 import org.tmatesoft.hg.internal.DataAccess; |
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30 import org.tmatesoft.hg.internal.Experimental; |
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Issue 31: Revlog#walk() fails with AIOOBE when start > 0
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31 import org.tmatesoft.hg.internal.IntMap; |
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32 import org.tmatesoft.hg.internal.Preview; |
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33 import org.tmatesoft.hg.internal.RevlogStream; |
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34 import org.tmatesoft.hg.util.Adaptable; |
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35 import org.tmatesoft.hg.util.ByteChannel; |
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36 import org.tmatesoft.hg.util.CancelSupport; |
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37 import org.tmatesoft.hg.util.CancelledException; |
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38 import org.tmatesoft.hg.util.LogFacility; |
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39 import org.tmatesoft.hg.util.ProgressSupport; |
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40 |
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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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53 |
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54 private final HgRepository repo; |
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55 protected final RevlogStream content; |
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56 |
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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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67 |
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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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73 |
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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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77 |
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78 /** |
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79 * @return total number of revisions kept in this revlog |
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80 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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81 */ |
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82 public final int getRevisionCount() throws HgRuntimeException { |
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83 return content.revisionCount(); |
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84 } |
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85 |
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86 /** |
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87 * @return index of last known revision, a.k.a. {@link HgRepository#TIP}, or {@link HgRepository#NO_REVISION} if revlog is empty |
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88 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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89 */ |
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90 public final int getLastRevision() throws HgRuntimeException { |
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91 // although old code gives correct result when revlog is empty (NO_REVISION deliberately == -1), |
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92 // it's still better to be explicit |
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93 int revCount = content.revisionCount(); |
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94 return revCount == 0 ? NO_REVISION : revCount - 1; |
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95 } |
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96 |
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97 /** |
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98 * Map revision index to unique revision identifier (nodeid). |
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99 * |
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100 * @param revisionIndex index of the entry in this revlog, may be {@link HgRepository#TIP} |
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101 * @return revision nodeid of the entry |
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102 * |
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103 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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104 */ |
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105 public final Nodeid getRevision(int revisionIndex) throws HgRuntimeException { |
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106 // XXX cache nodeids? Rather, if context.getCache(this).getRevisionMap(create == false) != null, use it |
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107 return Nodeid.fromBinary(content.nodeid(revisionIndex), 0); |
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108 } |
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109 |
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110 /** |
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111 * Effective alternative to map few revision indexes to corresponding nodeids at once. |
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112 * <p>Note, there are few aspects to be careful about when using this method<ul> |
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113 * <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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114 * <li>supplied array get modified (sorted)</ul> |
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115 * @return list of mapped revisions in no particular order |
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116 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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117 */ |
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118 public final List<Nodeid> getRevisions(int... revisions) throws HgRuntimeException { |
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119 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(revisions.length); |
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120 Arrays.sort(revisions); |
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121 getRevisionsInternal(rv, revisions); |
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122 return rv; |
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123 } |
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124 |
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125 /*package-local*/ void getRevisionsInternal(final List<Nodeid> retVal, int[] sortedRevs) throws HgInvalidRevisionException, HgInvalidControlFileException { |
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126 // once I have getRevisionMap and may find out whether it is avalable from cache, |
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127 // may use it, perhaps only for small number of revisions |
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128 content.iterate(sortedRevs, false, new RevlogStream.Inspector() { |
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129 |
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130 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) { |
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131 retVal.add(Nodeid.fromBinary(nodeid, 0)); |
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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 /** |
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137 * Get local index of the specified revision. |
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138 * If unsure, use {@link #isKnown(Nodeid)} to find out whether nodeid belongs to this revlog. |
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139 * |
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140 * For occasional queries, this method works with decent performance, despite its O(n/2) approach. |
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141 * Alternatively, if you need to perform multiple queries (e.g. at least 15-20), {@link HgRevisionMap} may come handy. |
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142 * |
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143 * @param nid revision to look up |
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144 * @return revision local index in this revlog |
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145 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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146 */ |
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147 public final int getRevisionIndex(Nodeid nid) throws HgRuntimeException { |
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148 int revision = content.findRevisionIndex(nid); |
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149 if (revision == BAD_REVISION) { |
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150 // using toString() to identify revlog. HgDataFile.toString includes path, HgManifest and HgChangelog instances |
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151 // are fine with default (class name) |
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152 // Perhaps, more tailored description method would be suitable here |
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153 throw new HgInvalidRevisionException(String.format("Can't find revision %s in %s", nid.shortNotation(), this), nid, null); |
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154 } |
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155 return revision; |
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156 } |
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157 |
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158 /** |
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159 * Note, {@link Nodeid#NULL} nodeid is not reported as known in any revlog. |
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160 * |
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161 * @param nodeid |
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162 * @return <code>true</code> if revision is part of this revlog |
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163 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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164 */ |
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165 public final boolean isKnown(Nodeid nodeid) throws HgRuntimeException { |
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166 final int rn = content.findRevisionIndex(nodeid); |
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167 if (BAD_REVISION == rn) { |
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168 return false; |
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169 } |
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170 if (rn < 0 || rn >= content.revisionCount()) { |
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171 // Sanity check |
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172 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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173 } |
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174 return true; |
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175 } |
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176 |
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177 /** |
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178 * Access to revision data as is, equivalent to <code>rawContent(getRevisionIndex(nodeid), sink)</code> |
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179 * |
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180 * @param nodeid revision to retrieve |
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181 * @param sink data destination |
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182 * |
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183 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog |
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184 * @throws HgInvalidControlFileException if access to revlog index/data entry failed |
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185 * @throws CancelledException if content retrieval operation was cancelled |
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186 * |
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187 * @see #rawContent(int, ByteChannel) |
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188 */ |
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189 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException { |
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190 rawContent(getRevisionIndex(nodeid), sink); |
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191 } |
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192 |
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193 /** |
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194 * 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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195 * |
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196 * @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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197 * @param sink data destination |
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198 * |
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199 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog |
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200 * @throws HgInvalidControlFileException if access to revlog index/data entry failed |
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201 * @throws CancelledException if content retrieval operation was cancelled |
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202 */ |
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203 protected void rawContent(int revisionIndex, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException { |
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204 if (sink == null) { |
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205 throw new IllegalArgumentException(); |
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206 } |
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207 try { |
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208 ContentPipe insp = new ContentPipe(sink, 0, repo.getSessionContext().getLog()); |
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209 insp.checkCancelled(); |
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210 content.iterate(revisionIndex, revisionIndex, true, insp); |
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211 insp.checkFailed(); |
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212 } catch (IOException ex) { |
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213 HgInvalidControlFileException e = new HgInvalidControlFileException(String.format("Access to revision %d content failed", revisionIndex), ex, null); |
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214 e.setRevisionIndex(revisionIndex); |
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215 // TODO post 1.0 e.setFileName(content.getIndexFile() or this.getHumanFriendlyPath()) - shall decide whether |
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216 // protected abstract getHFPath() with impl in HgDataFile, HgManifest and HgChangelog or path is data of either Revlog or RevlogStream |
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217 // Do the same (add file name) below |
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218 throw e; |
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219 } catch (HgInvalidControlFileException ex) { |
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220 throw ex.isRevisionIndexSet() ? ex : ex.setRevisionIndex(revisionIndex); |
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221 } |
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222 } |
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223 |
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224 /** |
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225 * Fills supplied arguments with information about revision parents. |
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226 * |
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227 * @param revision - revision to query parents, or {@link HgRepository#TIP} |
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228 * @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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229 * @param parent1 - byte[20] or null, if parent's nodeid is not needed |
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230 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed |
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231 * @throws IllegalArgumentException if passed arrays can't fit requested data |
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232 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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233 */ |
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234 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) throws HgRuntimeException, IllegalArgumentException { |
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235 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) { |
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236 throw new HgInvalidRevisionException(revision); |
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237 } |
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238 if (parentRevisions == null || parentRevisions.length < 2) { |
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239 throw new IllegalArgumentException(String.valueOf(parentRevisions)); |
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240 } |
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241 if (parent1 != null && parent1.length < 20) { |
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242 throw new IllegalArgumentException(parent1.toString()); |
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243 } |
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244 if (parent2 != null && parent2.length < 20) { |
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245 throw new IllegalArgumentException(parent2.toString()); |
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246 } |
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247 class ParentCollector implements RevlogStream.Inspector { |
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248 public int p1 = -1; |
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249 public int p2 = -1; |
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250 public byte[] nodeid; |
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251 |
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252 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) { |
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253 p1 = parent1Revision; |
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254 p2 = parent2Revision; |
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255 this.nodeid = new byte[20]; |
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256 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros. |
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257 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20); |
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258 } |
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259 }; |
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260 ParentCollector pc = new ParentCollector(); |
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261 content.iterate(revision, revision, false, pc); |
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262 // although next code looks odd (NO_REVISION *is* -1), it's safer to be explicit |
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263 parentRevisions[0] = pc.p1 == -1 ? NO_REVISION : pc.p1; |
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264 parentRevisions[1] = pc.p2 == -1 ? NO_REVISION : pc.p2; |
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265 if (parent1 != null) { |
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266 if (parentRevisions[0] == NO_REVISION) { |
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267 Arrays.fill(parent1, 0, 20, (byte) 0); |
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268 } else { |
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269 content.iterate(parentRevisions[0], parentRevisions[0], false, pc); |
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270 System.arraycopy(pc.nodeid, 0, parent1, 0, 20); |
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271 } |
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272 } |
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273 if (parent2 != null) { |
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274 if (parentRevisions[1] == NO_REVISION) { |
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275 Arrays.fill(parent2, 0, 20, (byte) 0); |
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276 } else { |
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277 content.iterate(parentRevisions[1], parentRevisions[1], false, pc); |
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278 System.arraycopy(pc.nodeid, 0, parent2, 0, 20); |
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279 } |
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280 } |
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281 } |
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282 |
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283 /** |
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284 * EXPERIMENTAL CODE, DO NOT USE |
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285 * |
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286 * Alternative revlog iteration |
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287 * |
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288 * @param start |
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289 * @param end |
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290 * @param inspector |
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291 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em> |
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292 */ |
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324
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293 @Experimental |
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294 public final void indexWalk(int start, int end, final Revlog.Inspector inspector) throws HgRuntimeException { |
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295 int lastRev = getLastRevision(); |
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296 final int _start = start == TIP ? lastRev : start; |
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297 if (end == TIP) { |
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298 end = lastRev; |
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299 } |
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300 final RevisionInspector revisionInsp = Adaptable.Factory.getAdapter(inspector, RevisionInspector.class, null); |
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301 final ParentInspector parentInsp = Adaptable.Factory.getAdapter(inspector, ParentInspector.class, null); |
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302 final Nodeid[] allRevisions = parentInsp == null ? null : new Nodeid[end - _start + 1]; |
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303 // next are to build set of parent indexes that are not part of the range iteration |
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304 // i.e. those parents we need to read separately. See Issue 31 for details. |
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305 final int[] firstParentIndexes = parentInsp == null || _start == 0 ? null : new int[allRevisions.length]; |
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306 final int[] secondParentIndexes = parentInsp == null || _start == 0 ? null : new int[allRevisions.length]; |
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307 final IntMap<Nodeid> missingParents = parentInsp == null || _start == 0 ? null : new IntMap<Nodeid>(16); |
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308 |
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309 content.iterate(_start, end, false, new RevlogStream.Inspector() { |
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310 private int i = 0; |
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311 |
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312 public void next(int revisionIndex, int actualLen, int baseRevIndex, int linkRevIndex, int parent1RevIndex, int parent2RevIndex, byte[] nodeid, DataAccess data) { |
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313 Nodeid nid = Nodeid.fromBinary(nodeid, 0); |
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314 if (revisionInsp != null) { |
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315 revisionInsp.next(revisionIndex, nid, linkRevIndex); |
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316 } |
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317 if (parentInsp != null) { |
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318 allRevisions[i] = nid; |
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319 if (_start > 0) { |
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320 firstParentIndexes[i] = parent1RevIndex; |
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321 secondParentIndexes[i] = parent2RevIndex; |
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322 if (parent1RevIndex < _start && parent1RevIndex >= 0) { |
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323 missingParents.put(parent1RevIndex, null); |
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324 } |
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325 if (parent2RevIndex < _start && parent2RevIndex >= 0) { |
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326 missingParents.put(parent2RevIndex, null); |
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327 } |
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328 } else { |
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329 Nodeid p1 = parent1RevIndex == -1 ? Nodeid.NULL : allRevisions[parent1RevIndex]; |
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330 Nodeid p2 = parent2RevIndex == -1 ? Nodeid.NULL : allRevisions[parent2RevIndex]; |
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331 parentInsp.next(revisionIndex, allRevisions[i], parent1RevIndex, parent2RevIndex, p1, p2); |
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332 } |
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333 i++; |
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334 } |
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335 } |
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336 }); |
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337 if (parentInsp != null && _start > 0) { |
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338 assert missingParents.size() > 0; // in fact, more relaxed than assert. rather 'assume' |
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339 // TODO int[] IntMap#keys() or even sort of iterator that can modify values |
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340 for (int k = missingParents.firstKey(), l = missingParents.lastKey(); k <= l; k++) { |
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341 if (missingParents.containsKey(k)) { |
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342 Nodeid nid = getRepo().getChangelog().getRevision(k); |
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343 missingParents.put(k, nid); |
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344 } |
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345 } |
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346 |
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347 for (int i = 0, revNum = _start; i < allRevisions.length; i++, revNum++) { |
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348 int riP1 = firstParentIndexes[i]; |
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349 int riP2 = secondParentIndexes[i]; |
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350 Nodeid p1, p2; |
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351 p1 = p2 = Nodeid.NULL; |
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352 if (riP1 >= _start) { |
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353 // p1 of revNum's revision is out of iterated range |
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354 // (don't check for riP1<end as I assume parents come prior to children in the changelog) |
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355 p1 = allRevisions[riP1 - start]; |
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356 } else if (riP1 != -1) { |
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357 assert riP1 >=0 && riP1 < _start; |
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358 p1 = missingParents.get(riP1); |
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359 } |
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360 // same for Pp2 |
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361 if (riP2 >= _start) { |
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362 p2 = allRevisions[riP2 - start]; |
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363 } else if (riP2 != -1) { |
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364 assert riP2 >= 0 && riP2 < _start; |
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365 p2 = missingParents.get(riP2); |
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366 } |
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367 parentInsp.next(revNum, allRevisions[i], riP1, riP2, p1, p2); |
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368 } |
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369 } |
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370 } |
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371 |
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372 /** |
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373 * MARKER |
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374 */ |
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375 @Experimental |
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376 public interface Inspector { |
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377 } |
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378 |
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379 @Experimental |
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380 public interface RevisionInspector extends Inspector { |
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368
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381 void next(int revisionIndex, Nodeid revision, int linkedRevisionIndex); |
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382 } |
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383 |
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384 @Experimental |
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385 public interface ParentInspector extends Inspector { |
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327
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386 // XXX document whether parentX is -1 or a constant (BAD_REVISION? or dedicated?) |
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387 void next(int revisionIndex, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2); |
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388 } |
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389 |
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432
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390 protected HgParentChildMap<? extends Revlog> getParentWalker() { |
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391 HgParentChildMap<Revlog> pw = new HgParentChildMap<Revlog>(this); |
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392 pw.init(); |
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393 return pw; |
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394 } |
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538
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395 |
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433
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396 /* |
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397 * class with cancel and few other exceptions support. TODO consider general superclass to share with e.g. HgManifestCommand.Mediator |
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398 */ |
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399 protected abstract static class ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport { |
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400 private Exception failure; |
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401 private CancelSupport cancelSupport; |
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402 |
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403 protected void setCancelSupport(CancelSupport cs) { |
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404 assert cancelSupport == null; // no reason to set it twice |
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405 cancelSupport = cs; |
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406 } |
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407 |
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408 protected void recordFailure(Exception ex) { |
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409 assert failure == null; |
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410 failure = ex; |
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411 } |
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412 |
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413 public void checkFailed() throws HgRuntimeException, IOException, CancelledException { |
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414 if (failure == null) { |
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415 return; |
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416 } |
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417 if (failure instanceof IOException) { |
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418 throw (IOException) failure; |
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419 } |
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420 if (failure instanceof CancelledException) { |
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421 throw (CancelledException) failure; |
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422 } |
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423 if (failure instanceof HgRuntimeException) { |
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424 throw (HgRuntimeException) failure; |
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425 } |
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423
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426 throw new HgInvalidStateException(failure.toString()); |
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427 } |
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428 |
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429 public void checkCancelled() throws CancelledException { |
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430 if (cancelSupport != null) { |
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431 cancelSupport.checkCancelled(); |
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432 } |
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433 } |
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434 } |
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435 |
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436 protected static class ContentPipe extends ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport { |
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437 private final ByteChannel sink; |
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438 private final int offset; |
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439 private final LogFacility logFacility; |
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440 |
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441 /** |
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442 * @param _sink - cannot be <code>null</code> |
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443 * @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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444 * @param log optional facility to put warnings/debug messages into, may be null. |
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445 */ |
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446 public ContentPipe(ByteChannel _sink, int seekOffset, LogFacility log) { |
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447 assert _sink != null; |
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448 sink = _sink; |
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449 setCancelSupport(CancelSupport.Factory.get(_sink)); |
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450 offset = seekOffset; |
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451 logFacility = log; |
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452 } |
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453 |
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454 protected void prepare(int revisionNumber, DataAccess da) throws IOException { |
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455 if (offset > 0) { // save few useless reset/rewind operations |
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456 da.seek(offset); |
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457 } |
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458 } |
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459 |
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460 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) { |
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461 try { |
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462 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed) |
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463 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink); |
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464 ByteBuffer buf = ByteBuffer.allocate(actualLen > 8192 ? 8192 : actualLen); |
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465 Preview p = Adaptable.Factory.getAdapter(sink, Preview.class, null); |
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466 if (p != null) { |
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467 progressSupport.start(2 * da.length()); |
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468 while (!da.isEmpty()) { |
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469 checkCancelled(); |
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470 da.readBytes(buf); |
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471 p.preview(buf); |
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472 buf.clear(); |
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473 } |
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474 da.reset(); |
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475 prepare(revisionNumber, da); |
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476 progressSupport.worked(da.length()); |
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477 buf.clear(); |
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478 } else { |
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479 progressSupport.start(da.length()); |
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480 } |
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481 while (!da.isEmpty()) { |
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482 checkCancelled(); |
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483 da.readBytes(buf); |
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484 buf.flip(); // post: position == 0 |
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485 // XXX I may not rely on returned number of bytes but track change in buf position instead. |
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486 |
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487 int consumed = sink.write(buf); |
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488 if ((consumed == 0 || consumed != buf.position()) && logFacility != null) { |
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456
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489 logFacility.dump(getClass(), Warn, "Bad data sink when reading revision %d. Reported %d bytes consumed, byt actually read %d", revisionNumber, consumed, buf.position()); |
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490 } |
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491 if (buf.position() == 0) { |
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492 throw new HgInvalidStateException("Bad sink implementation (consumes no bytes) results in endless loop"); |
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493 } |
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494 buf.compact(); // ensure (a) there's space for new (b) data starts at 0 |
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495 progressSupport.worked(consumed); |
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496 } |
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497 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully. |
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498 } catch (IOException ex) { |
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499 recordFailure(ex); |
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500 } catch (CancelledException ex) { |
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501 recordFailure(ex); |
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502 } |
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503 } |
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504 } |
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505 } |