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annotate src/org/tmatesoft/hg/internal/ManifestRevision.java @ 681:4f93bbc73b64

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Do not instantiate thousands of small arrays(numerous readInt/readLong calls)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 21 Jul 2013 17:48:05 +0200
parents dd4f6311af52
children 7743a9c10bfa
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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.internal;
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18
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19 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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21 import java.util.Collection;
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22 import java.util.TreeMap;
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24 import org.tmatesoft.hg.core.Nodeid;
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25 import org.tmatesoft.hg.repo.HgManifest;
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26 import org.tmatesoft.hg.util.Convertor;
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27 import org.tmatesoft.hg.util.Path;
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29 /**
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30 * Specific revision of the manifest.
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31 * Note, suited to keep single revision only ({@link #revision()}), which is linked to changeset {@link #changesetRevisionIndex()}.
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32 *
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33 * @author Artem Tikhomirov
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34 * @author TMate Software Ltd.
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35 */
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36 public final class ManifestRevision implements HgManifest.Inspector {
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37 private final TreeMap<Path, Nodeid> idsMap;
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38 private final TreeMap<Path, HgManifest.Flags> flagsMap;
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39 private final Convertor<Nodeid> idsPool;
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40 private final Convertor<Path> namesPool;
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41 private Nodeid manifestRev = Nodeid.NULL;
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42 private int changelogRevIndex = NO_REVISION, manifestRevIndex = NO_REVISION;
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44 // optional pools for effective management of nodeids and filenames (they are likely
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45 // to be duplicated among different manifest revisions
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46 public ManifestRevision(Pool<Nodeid> nodeidPool, Convertor<Path> filenamePool) {
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47 idsPool = nodeidPool;
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48 namesPool = filenamePool;
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49 idsMap = new TreeMap<Path, Nodeid>();
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50 flagsMap = new TreeMap<Path, HgManifest.Flags>();
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51 }
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52
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53 public Collection<Path> files() {
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54 return idsMap.keySet();
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55 }
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56
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57 public Nodeid nodeid(Path fname) {
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58 return idsMap.get(fname);
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59 }
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60
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61 public HgManifest.Flags flags(Path fname) {
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62 HgManifest.Flags f = flagsMap.get(fname);
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63 return f == null ? HgManifest.Flags.RegularFile : f;
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64 }
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66 /**
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67 * @return identifier of this manifest revision
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68 */
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69 public Nodeid revision() {
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70 return manifestRev;
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71 }
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72
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73 public int revisionIndex() {
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74 return manifestRevIndex;
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75 }
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77 /**
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78 * @return revision index for the changelog this manifest revision is linked to
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79 */
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80 public int changesetRevisionIndex() {
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81 return changelogRevIndex;
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82 }
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84 //
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85
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86 public boolean next(Nodeid nid, Path fname, HgManifest.Flags flags) {
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87 if (namesPool != null) {
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88 fname = namesPool.mangle(fname);
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89 }
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90 if (idsPool != null) {
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91 nid = idsPool.mangle(nid);
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92 }
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93 idsMap.put(fname, nid);
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94 if (flags != HgManifest.Flags.RegularFile) {
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95 // TreeMap$Entry takes 32 bytes. No reason to keep regular file attribute (in fact, no flags state)
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96 // for such price
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97 // Alternatively, Map<Path, Pair<Nodeid, Flags>> might come as a solution
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98 // however, with low rate of elements with flags this would consume more memory
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99 // than two distinct maps (sizeof(Pair) == 16).
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100 // Map<Pair>: n*(32+16)
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101 // 2 Maps: n*32 + m*32 <-- consumes more with m>n/2
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102 flagsMap.put(fname, flags);
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103 }
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104 return true;
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105 }
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106
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107 public boolean end(int revision) {
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108 // in fact, this class cares about single revision
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109 return false;
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110 }
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111
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112 public boolean begin(int revisionIndex, Nodeid revision, int changelogRevisionIndex) {
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113 if (manifestRev != null) {
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114 idsMap.clear();
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115 flagsMap.clear();
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116 }
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117 manifestRev = revision;
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118 manifestRevIndex = revisionIndex;
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119 changelogRevIndex = changelogRevisionIndex;
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120 return true;
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121 }
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122 }