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annotate src/org/tmatesoft/hg/repo/HgMergeState.java @ 264:6bb5e7ed051a

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Optimize memory usage (reduce number of objects instantiated) when pooling file names and nodeids during manifest parsing
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 19 Aug 2011 03:36:25 +0200
parents 4c3b9f679412
children c6450b0b1fd5
rev   line source
231
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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18
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19 import java.io.BufferedReader;
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20 import java.io.File;
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21 import java.io.FileReader;
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22 import java.io.IOException;
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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.Collections;
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26 import java.util.List;
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27
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28 import org.tmatesoft.hg.core.HgBadStateException;
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29 import org.tmatesoft.hg.core.HgFileRevision;
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30 import org.tmatesoft.hg.core.Nodeid;
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31 import org.tmatesoft.hg.internal.ManifestRevision;
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32 import org.tmatesoft.hg.internal.Pool;
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33 import org.tmatesoft.hg.util.Path;
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34 import org.tmatesoft.hg.util.PathPool;
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35 import org.tmatesoft.hg.util.PathRewrite;
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36
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37 /**
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38 *
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 public class HgMergeState {
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43 private Nodeid wcp1, wcp2;
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44
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45 public enum Kind {
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46 Resolved, Unresolved;
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47 }
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48
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49 public static class Entry {
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50 private final Kind state;
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51 private final HgFileRevision parent1;
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52 private final HgFileRevision parent2;
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53 private final HgFileRevision ancestor;
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54 private final Path wcFile;
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55
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56 /*package-local*/Entry(Kind s, Path actualCopy, HgFileRevision p1, HgFileRevision p2, HgFileRevision ca) {
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57 if (p1 == null || p2 == null || ca == null || actualCopy == null) {
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58 throw new IllegalArgumentException();
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59 }
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60 state = s;
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61 wcFile = actualCopy;
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62 parent1 = p1;
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63 parent2 = p2;
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64 ancestor = ca;
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65 }
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66
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67 public Kind getState() {
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68 return state;
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69 }
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70 public Path getActualFile() {
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71 return wcFile;
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72 }
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73 public HgFileRevision getFirstParent() {
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74 return parent1;
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75 }
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76 public HgFileRevision getSecondParent() {
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77 return parent2;
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78 }
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79 public HgFileRevision getCommonAncestor() {
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80 return ancestor;
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81 }
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82 }
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83
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84 private final HgRepository repo;
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85 private Entry[] entries;
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86
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87 HgMergeState(HgRepository hgRepo) {
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88 repo = hgRepo;
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89 }
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90
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91 public void refresh() throws IOException/*XXX it's unlikely caller can do anything reasonable about IOException */ {
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92 entries = null;
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93 final File f = new File(repo.getRepositoryRoot(), "merge/state");
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94 if (!f.canRead()) {
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95 // empty state
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96 return;
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97 }
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98 Nodeid[] wcParents = repo.loadDirstate().parents();
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99 wcp1 = wcParents[0]; wcp2 = wcParents[1];
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100 ArrayList<Entry> result = new ArrayList<Entry>();
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101 PathPool pathPool = new PathPool(new PathRewrite.Empty());
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102 Pool<Nodeid> nodeidPool = new Pool<Nodeid>();
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103 Pool<String> fnamePool = new Pool<String>();
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104 final ManifestRevision m1 = new ManifestRevision(nodeidPool, fnamePool);
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105 final ManifestRevision m2 = new ManifestRevision(nodeidPool, fnamePool);
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106 final int rp1 = repo.getChangelog().getLocalRevision(wcp1);
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107 final int rp2 = repo.getChangelog().getLocalRevision(wcp2);
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108 repo.getManifest().walk(rp1, rp1, m1);
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109 repo.getManifest().walk(rp2, rp2, m2);
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110 BufferedReader br = new BufferedReader(new FileReader(f));
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111 String s = br.readLine();
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112 Nodeid n = Nodeid.fromAscii(s);
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113 if (!wcp1.equals(n)) {
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114 throw new AssertionError("I assume merge/state records revision of the wc we merge into");
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115 }
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116 while ((s = br.readLine()) != null) {
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117 String[] r = s.split("\\00");
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118 HgFileRevision p1 = new HgFileRevision(repo, m1.nodeid(r[3]), pathPool.path(r[3]));
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119 HgFileRevision ca = new HgFileRevision(repo, Nodeid.fromAscii(r[5]), pathPool.path(r[4]));
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120 HgFileRevision p2 = new HgFileRevision(repo, m2.nodeid(r[6]), pathPool.path(r[6]));
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121 final Kind k;
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122 if ("u".equals(r[1])) {
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123 k = Kind.Unresolved;
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124 } else if ("r".equals(r[1])) {
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125 k = Kind.Resolved;
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126 } else {
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127 throw new HgBadStateException(r[1]);
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128 }
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129 Entry e = new Entry(k, pathPool.path(r[0]), p1, p2, ca);
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130 result.add(e);
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131 }
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132 entries = result.toArray(new Entry[result.size()]);
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133 br.close();
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134 pathPool.clear();
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135 }
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136
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137 public Nodeid getFirstParent() {
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138 if (wcp1 == null) {
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139 throw new HgBadStateException("Call #refresh() first");
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140 }
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141 return wcp1;
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142 }
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143
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144 public Nodeid getSecondParent() {
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145 if (wcp2 == null) {
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146 throw new HgBadStateException("Call #refresh() first");
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147 }
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148 return wcp2;
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149 }
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150
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151 public List<Entry> getConflicts() {
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152 return entries == null ? Collections.<Entry>emptyList() : Arrays.asList(entries);
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153 }
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154 }