Mercurial > jhg
annotate src/org/tmatesoft/hg/repo/HgChangelog.java @ 681:4f93bbc73b64
Do not instantiate thousands of small arrays(numerous readInt/readLong calls)
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Sun, 21 Jul 2013 17:48:05 +0200 |
parents | 545b1d4cc11d |
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Refactor to move revlog content to base class
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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 java.io.IOException; |
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20 import java.util.ArrayList; |
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21 import java.util.Arrays; |
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22 import java.util.Calendar; |
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23 import java.util.Date; |
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24 import java.util.Formatter; |
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25 import java.util.List; |
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26 import java.util.Locale; |
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27 import java.util.Map; |
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28 import java.util.TimeZone; |
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29 |
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30 import org.tmatesoft.hg.core.Nodeid; |
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31 import org.tmatesoft.hg.core.SessionContext; |
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32 import org.tmatesoft.hg.internal.Callback; |
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33 import org.tmatesoft.hg.internal.ChangesetParser; |
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34 import org.tmatesoft.hg.internal.DataAccess; |
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35 import org.tmatesoft.hg.internal.Lifecycle; |
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36 import org.tmatesoft.hg.internal.LifecycleBridge; |
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37 import org.tmatesoft.hg.internal.RevlogStream; |
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38 import org.tmatesoft.hg.util.Adaptable; |
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39 import org.tmatesoft.hg.util.CancelSupport; |
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40 import org.tmatesoft.hg.util.ProgressSupport; |
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41 |
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42 /** |
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43 * Representation of the Mercurial changelog file (list of ChangeSets) |
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45 * @author Artem Tikhomirov |
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46 * @author TMate Software Ltd. |
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47 */ |
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48 public final class HgChangelog extends Revlog { |
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49 |
153 | 50 /* package-local */HgChangelog(HgRepository hgRepo, RevlogStream content) { |
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51 super(hgRepo, content, true); |
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52 } |
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53 |
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54 /** |
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55 * Iterate over whole changelog |
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56 * @param inspector callback to process entries |
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57 * @throws HgInvalidControlFileException if failed to access revlog index/data entry. <em>Runtime exception</em> |
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58 * @throws HgRuntimeException subclass thereof to indicate other issues with the library. <em>Runtime exception</em> |
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59 */ |
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60 public void all(final HgChangelog.Inspector inspector) throws HgRuntimeException { |
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61 range(0, getLastRevision(), inspector); |
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62 } |
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63 |
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64 /** |
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65 * Iterate over changelog part |
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66 * @param start first changelog entry to process |
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67 * @param end last changelog entry to process |
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68 * @param inspector callback to process entries |
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69 * @throws HgInvalidRevisionException if any supplied revision doesn't identify revision from this revlog. <em>Runtime exception</em> |
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70 * @throws HgInvalidControlFileException if failed to access revlog index/data entry. <em>Runtime exception</em> |
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71 * @throws HgRuntimeException subclass thereof to indicate other issues with the library. <em>Runtime exception</em> |
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72 */ |
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73 public void range(int start, int end, final HgChangelog.Inspector inspector) throws HgRuntimeException { |
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74 if (inspector == null) { |
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75 throw new IllegalArgumentException(); |
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76 } |
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77 content.iterate(start, end, true, new RawCsetParser(getRepo(), inspector)); |
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78 } |
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79 |
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80 /** |
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81 * @see #range(int, int, Inspector) |
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82 * @return changeset entry objects, never <code>null</code> |
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83 * @throws HgInvalidRevisionException if any supplied revision doesn't identify revision from this revlog. <em>Runtime exception</em> |
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84 * @throws HgInvalidControlFileException if failed to access revlog index/data entry. <em>Runtime exception</em> |
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85 * @throws HgRuntimeException subclass thereof to indicate other issues with the library. <em>Runtime exception</em> |
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86 */ |
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87 public List<RawChangeset> range(int start, int end) throws HgRuntimeException { |
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88 final RawCsetCollector c = new RawCsetCollector(end - start + 1); |
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89 range(start, end, c); |
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90 return c.result; |
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91 } |
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92 |
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93 /** |
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94 * Access individual revisions. Note, regardless of supplied revision order, inspector gets |
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95 * changesets strictly in the order they are in the changelog. |
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96 * @param inspector callback to get changesets |
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97 * @param revisions revisions to read, unrestricted ordering. |
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98 * @throws HgInvalidRevisionException if any supplied revision doesn't identify revision from this revlog <em>Runtime exception</em> |
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99 * @throws HgInvalidControlFileException if failed to access revlog index/data entry. <em>Runtime exception</em> |
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100 * @throws HgRuntimeException subclass thereof to indicate other issues with the library. <em>Runtime exception</em> |
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101 */ |
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102 public void range(final HgChangelog.Inspector inspector, final int... revisions) throws HgRuntimeException { |
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103 Arrays.sort(revisions); |
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104 rangeInternal(inspector, revisions); |
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105 } |
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106 |
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107 /** |
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108 * Friends-only version of {@link #range(Inspector, int...)}, when callers know array is sorted |
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109 */ |
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110 /*package-local*/ void rangeInternal(HgChangelog.Inspector inspector, int[] sortedRevisions) throws HgRuntimeException { |
242
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111 if (sortedRevisions == null || sortedRevisions.length == 0) { |
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112 return; |
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113 } |
242
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114 if (inspector == null) { |
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115 throw new IllegalArgumentException(); |
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116 } |
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117 content.iterate(sortedRevisions, true, new RawCsetParser(getRepo(), inspector)); |
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118 } |
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119 |
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120 /** |
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121 * Get changeset entry object |
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122 * @throws HgInvalidRevisionException if supplied nodeid doesn't identify any revision from this revlog. <em>Runtime exception</em> |
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123 * @throws HgInvalidControlFileException if failed to access revlog index/data entry. <em>Runtime exception</em> |
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124 * @throws HgRuntimeException subclass thereof to indicate other issues with the library. <em>Runtime exception</em> |
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125 */ |
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126 public RawChangeset changeset(Nodeid nid) throws HgRuntimeException { |
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127 int x = getRevisionIndex(nid); |
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128 return range(x, x).get(0); |
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129 } |
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130 |
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131 @Callback |
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132 public interface Inspector { |
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133 /** |
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134 * Access next changeset |
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135 * TODO describe what revisionNumber is when Inspector is used with HgBundle (BAD_REVISION or bundle's local order?) |
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136 * |
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137 * @param revisionIndex index of revision being inspected, local to the inspected object |
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138 * @param nodeid revision being inspected |
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139 * @param cset changeset raw data |
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140 */ |
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141 void next(int revisionIndex, Nodeid nodeid, RawChangeset cset) throws HgRuntimeException; |
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142 } |
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143 |
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144 /** |
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145 * Entry in the Changelog |
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146 */ |
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147 public static final class RawChangeset implements Cloneable /* for those that would like to keep a copy */{ |
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148 // would be nice to get it immutable, but then we can't reuse instances |
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149 /* final */Nodeid manifest; |
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150 String user; |
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151 String comment; |
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152 String[] files; // shall not be modified (#clone() does shallow copy) |
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153 Date time; |
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154 int timezone; |
161
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155 // http://mercurial.selenic.com/wiki/PruningDeadBranches - Closing changesets can be identified by close=1 in the changeset's extra field. |
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156 Map<String, String> extras; |
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157 |
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158 private RawChangeset() { |
153 | 159 } |
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160 |
153 | 161 public Nodeid manifest() { |
162 return manifest; | |
163 } | |
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164 |
153 | 165 public String user() { |
166 return user; | |
167 } | |
168 | |
169 public String comment() { | |
170 return comment; | |
171 } | |
172 | |
173 public List<String> files() { | |
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174 return Arrays.asList(files); |
153 | 175 } |
176 | |
177 public Date date() { | |
178 return time; | |
179 } | |
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180 |
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181 /** |
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182 * @return time zone value, as is, positive for Western Hemisphere. |
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183 */ |
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184 public int timezone() { |
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185 return timezone; |
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186 } |
153 | 187 |
188 public String dateString() { | |
189 // XXX keep once formatted? Perhaps, there's faster way to set up calendar/time zone? | |
190 StringBuilder sb = new StringBuilder(30); | |
191 Formatter f = new Formatter(sb, Locale.US); | |
211
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192 TimeZone tz = TimeZone.getTimeZone(TimeZone.getAvailableIDs(timezone * 1000)[0]); |
153 | 193 // apparently timezone field records number of seconds time differs from UTC, |
194 // i.e. value to substract from time to get UTC time. Calendar seems to add | |
195 // timezone offset to UTC, instead, hence sign change. | |
211
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196 // tz.setRawOffset(timezone * -1000); |
153 | 197 Calendar c = Calendar.getInstance(tz, Locale.US); |
198 c.setTime(time); | |
199 f.format("%ta %<tb %<td %<tH:%<tM:%<tS %<tY %<tz", c); | |
200 return sb.toString(); | |
201 } | |
202 | |
203 public Map<String, String> extras() { | |
204 return extras; | |
205 } | |
206 | |
207 public String branch() { | |
208 return extras.get("branch"); | |
209 } | |
210 | |
211 @Override | |
212 public String toString() { | |
213 StringBuilder sb = new StringBuilder(); | |
214 sb.append("Changeset {"); | |
215 sb.append("User: ").append(user).append(", "); | |
216 sb.append("Comment: ").append(comment).append(", "); | |
217 sb.append("Manifest: ").append(manifest).append(", "); | |
218 sb.append("Date: ").append(time).append(", "); | |
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219 sb.append("Files: ").append(files.length); |
153 | 220 for (String s : files) { |
221 sb.append(", ").append(s); | |
222 } | |
223 if (extras != null) { | |
224 sb.append(", Extra: ").append(extras); | |
225 } | |
226 sb.append("}"); | |
227 return sb.toString(); | |
228 } | |
229 | |
230 @Override | |
154
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231 public RawChangeset clone() { |
153 | 232 try { |
154
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233 return (RawChangeset) super.clone(); |
153 | 234 } catch (CloneNotSupportedException ex) { |
235 throw new InternalError(ex.toString()); | |
236 } | |
237 } | |
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238 } |
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239 |
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240 /*package-local*/static final class RawCsetFactory implements ChangesetParser.CsetFactory { |
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241 private RawChangeset cset; |
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242 |
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243 public RawCsetFactory(boolean shallReuseCsetInstance) { |
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244 if (shallReuseCsetInstance) { |
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245 cset = new RawChangeset(); |
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246 } |
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247 } |
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248 |
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249 public RawChangeset create(Nodeid nodeidManifest, String user, Date time, int timezone, List<String> files, String comment, Map<String, String> extrasMap) { |
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250 RawChangeset target; |
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251 if (cset != null) { |
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252 target = cset; |
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253 } else { |
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254 target = new RawChangeset(); |
153 | 255 } |
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256 target.manifest = nodeidManifest; |
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257 target.user = user; |
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258 target.time = time; |
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259 target.timezone = timezone; |
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260 target.files = files == null ? new String[0] : files.toArray(new String[files.size()]); |
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261 target.comment = comment; |
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262 target.extras = extrasMap; |
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263 return target; |
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264 } |
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265 } |
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266 |
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267 private static class RawCsetCollector implements Inspector { |
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268 final ArrayList<RawChangeset> result; |
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269 |
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270 public RawCsetCollector(int count) { |
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271 result = new ArrayList<RawChangeset>(count > 0 ? count : 5); |
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272 } |
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273 |
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274 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) { |
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275 result.add(cset.clone()); |
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276 } |
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277 } |
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278 |
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279 private static final class RawCsetParser implements RevlogStream.Inspector, Adaptable, Lifecycle { |
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280 |
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281 private final Inspector inspector; |
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282 private final ChangesetParser csetBuilder; |
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283 // non-null when inspector uses high-level lifecycle entities (progress and/or cancel supports) |
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284 private final LifecycleBridge lifecycleStub; |
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285 // non-null when inspector relies on low-level lifecycle and is responsible |
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286 // to proceed any possible high-level entities himself. |
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287 private final Lifecycle inspectorLifecycle; |
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288 |
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289 public RawCsetParser(SessionContext.Source sessionContext, HgChangelog.Inspector delegate) { |
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290 assert delegate != null; |
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291 inspector = delegate; |
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292 csetBuilder = new ChangesetParser(sessionContext, new RawCsetFactory(true)); |
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293 inspectorLifecycle = Adaptable.Factory.getAdapter(delegate, Lifecycle.class, null); |
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294 if (inspectorLifecycle == null) { |
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295 ProgressSupport ph = Adaptable.Factory.getAdapter(delegate, ProgressSupport.class, null); |
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296 CancelSupport cs = Adaptable.Factory.getAdapter(delegate, CancelSupport.class, null); |
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297 if (cs != null || ph != null) { |
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298 lifecycleStub = new LifecycleBridge(ph, cs); |
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299 } else { |
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300 lifecycleStub = null; |
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301 } |
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302 } else { |
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303 lifecycleStub = null; |
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304 } |
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305 } |
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306 |
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307 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) throws HgRuntimeException { |
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308 try { |
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309 RawChangeset cset = csetBuilder.parse(da); |
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310 // XXX there's no guarantee for Changeset.Callback that distinct instance comes each time, consider instance reuse |
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311 inspector.next(revisionNumber, Nodeid.fromBinary(nodeid, 0), cset); |
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312 if (lifecycleStub != null) { |
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313 lifecycleStub.nextStep(); |
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314 } |
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315 } catch (HgInvalidDataFormatException ex) { |
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316 throw ex.setRevisionIndex(revisionNumber); |
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317 } catch (IOException ex) { |
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318 // XXX need better exception, perhaps smth like HgChangelogException (extends HgInvalidControlFileException) |
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319 throw new HgInvalidControlFileException("Failed reading changelog", ex, null).setRevisionIndex(revisionNumber); |
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320 } |
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321 } |
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322 |
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323 public <T> T getAdapter(Class<T> adapterClass) { |
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324 if (adapterClass == Lifecycle.class) { |
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325 return adapterClass.cast(this); |
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326 } |
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327 // XXX what if caller takes Progress/Cancel (which we update through lifecycleStub, too) |
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328 return Adaptable.Factory.getAdapter(inspector, adapterClass, null); |
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329 } |
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330 |
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331 public void start(int count, Callback callback, Object token) { |
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332 if (inspectorLifecycle != null) { |
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333 inspectorLifecycle.start(count, callback, token); |
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334 } else if (lifecycleStub != null) { |
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335 lifecycleStub.start(count, callback, token); |
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336 } |
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337 } |
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338 |
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339 public void finish(Object token) { |
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340 if (inspectorLifecycle != null) { |
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341 inspectorLifecycle.finish(token); |
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342 } else if (lifecycleStub != null) { |
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343 lifecycleStub.finish(token); |
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344 } |
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345 csetBuilder.dispose(); |
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346 } |
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347 |
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348 } |
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349 } |