Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgRevisionMap.java @ 698:822f3a83ff57

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
in, out and clone tests pass for ssh repositories. Infrastructure to decouple HgRemoteRepository from specific Connector implementation
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 06 Aug 2013 21:18:33 +0200
parents 6334b0267103
children
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21
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22 import org.tmatesoft.hg.core.Nodeid;
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23 import org.tmatesoft.hg.internal.ArrayHelper;
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24 import org.tmatesoft.hg.repo.Revlog.RevisionInspector;
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25
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26 /**
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27 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of
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28 * multiple {@link Revlog#getRevisionIndex(Nodeid)} calls. Rule of thumb is 20+ calls (given
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29 * initialization costs). It's also important to take into account memory consumption, for huge
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30 * repositories use of this class may pay off only when accessing greatest fraction of all revisions.
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31 *
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32 * <p>Next code snippet shows instantiation and sample use:
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33 * <pre>
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34 * RevisionMap<HgChangelog> clogMap = new RevisionMap<HgChangelog>(clog).init();
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35 * RevisionMap<HgDataFile> fileMap = new RevisionMap<HgDataFile>(fileNode).init();
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36 *
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37 * int fileRevIndex = 0;
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38 * Nodeid fileRev = fileMap.revision(fileRevIndex);
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39 * int csetRevIndex = fileNode.getChangesetRevisionIndex(fileRevIndex);
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40 * Nodeid csetRev = clogMap.revision(localCset);
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41 * changesetToNodeidMap.put(csetRev, fileRev);
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42 * </pre>
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43 *
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44 * <p>
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45 * {@link Revlog#getRevisionIndex(Nodeid)} with straightforward lookup approach performs O(n/2)
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46 * <p>
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47 * {@link HgRevisionMap#revisionIndex(Nodeid)} is log(n), plus initialization is O(n) (just once).
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48 *
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49 * @see HgParentChildMap
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50 *
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51 * @author Artem Tikhomirov
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52 * @author TMate Software Ltd.
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53 */
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54 public final class HgRevisionMap<T extends Revlog> implements RevisionInspector {
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55 /*
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56 * in fact, initialization is much slower as it instantiates Nodeids, while #getRevisionIndex
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57 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171)
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58 * for complete changelog iteration.
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59 */
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60
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61 private final T revlog;
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62 /*
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63 * XXX 3 * (x * 4) bytes. Can I do better?
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64 * It seems, yes. Don't need to keep sorted, always can emulate it with indirect access to sequential through sorted2natural.
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65 * i.e. instead sorted[mid].compareTo(toFind), do sequential[sorted2natural[mid]].compareTo(toFind)
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66 */
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67 private Nodeid[] sequential; // natural repository order
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68 private ArrayHelper<Nodeid> seqWrapper;
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69
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70 public HgRevisionMap(T owner) {
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71 revlog = owner;
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72 }
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73
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74 public HgRepository getRepo() {
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75 return revlog.getRepo();
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76 }
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77
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78 public void next(int revisionIndex, Nodeid revision, int linkedRevision) {
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79 sequential[revisionIndex] = revision;
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80 }
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81
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82 /**
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83 * @return <code>this</code> for convenience.
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84 */
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85 public HgRevisionMap<T> init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) throws HgRuntimeException {
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86 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed?
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87 final int revisionCount = revlog.getRevisionCount();
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88 sequential = new Nodeid[revisionCount];
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89 revlog.indexWalk(0, TIP, this);
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90 // next is alternative to Arrays.sort(sorted), and build sorted2natural looking up each element of sequential in sorted.
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91 // the way sorted2natural was build is O(n*log n).
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92 seqWrapper = new ArrayHelper<Nodeid>(sequential);
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93 seqWrapper.sort(null, true, false);
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94 return this;
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95 }
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96
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97 /* friendly initializer to use from HgParentChildMap
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98 /*package*/ void init(ArrayHelper<Nodeid> _seqWrapper) {
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99 assert _seqWrapper.getData().length == revlog.getRevisionCount();
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100 sequential = _seqWrapper.getData();
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101 seqWrapper = _seqWrapper;
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102 }
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103
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104 public Nodeid revision(int revisionIndex) {
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105 return sequential[revisionIndex];
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106 }
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107
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108 public int revisionIndex(Nodeid revision) {
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109 if (revision == null || revision.isNull()) {
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110 return BAD_REVISION;
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111 }
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6334b0267103 ParentChildMap can supply RevisionMap. Refactor ArrayHelper to keep most of sorted/reverse index magic inside
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 628
diff changeset
112 return seqWrapper.binarySearch(revision, BAD_REVISION);
433
be697c3e951e Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
113 }
be697c3e951e Revlog.RevisionMap helper class got promoted as TLC, renamed to HgRevisionMap
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
114 }