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annotate test/org/tmatesoft/hg/test/MapTagsToFileRevisions.java @ 254:a620f0663a37

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Collect tags for a file - improve performance of 'sparse' manifest reads
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Aug 2011 04:03:29 +0200
parents
children 5a6ab50b4cbf
rev   line source
254
a620f0663a37 Collect tags for a file - improve performance of 'sparse' manifest reads
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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1 package org.tmatesoft.hg.test;
a620f0663a37 Collect tags for a file - improve performance of 'sparse' manifest reads
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2
a620f0663a37 Collect tags for a file - improve performance of 'sparse' manifest reads
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3 import java.io.*;
a620f0663a37 Collect tags for a file - improve performance of 'sparse' manifest reads
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4 import java.util.*;
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5 import java.util.Map.Entry;
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6
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7 import org.tmatesoft.hg.core.*;
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8 import org.tmatesoft.hg.internal.Pool;
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9 import org.tmatesoft.hg.repo.*;
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10 import org.tmatesoft.hg.repo.HgTags.TagInfo;
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11 import org.tmatesoft.hg.util.*;
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12
a620f0663a37 Collect tags for a file - improve performance of 'sparse' manifest reads
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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13 /**
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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14 * @author Marc Strapetz
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15 */
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16 public class MapTagsToFileRevisions {
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17
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18 // Static =================================================================
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19
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20 public static void main(String[] args) throws HgException, CancelledException {
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21 final long start = System.currentTimeMillis();
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22 final HgRepository repository = new HgLookup().detect(new File("/temp/hg/cpython"));
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23 final HgTags tags = repository.getTags();
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24 //
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25 // build cache
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26 final Map<String, Map<TagInfo, Nodeid>> file2tag2rev = new HashMap<String, Map<TagInfo, Nodeid>>();
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27 System.out.printf("Collecting manifests for %d tags\n", tags.getTags().size());
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28 // effective translation of changeset revisions to their local indexes
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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29 final HgChangelog.RevisionMap clogrmap = repository.getChangelog().new RevisionMap().init();
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30 int[] tagLocalRevs = new int[tags.getTags().size()];
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31 int i = 0;
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32 for (TagInfo tag : tags.getTags().values()) {
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33 final Nodeid tagRevision = tag.revision();
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34 int tagLocalRev = clogrmap.localRevision(tagRevision);
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35 tagLocalRevs[i++] = tagLocalRev;
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36 }
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37 System.out.printf("Found tag revisions to analyze: %d\n", System.currentTimeMillis() - start);
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38 //
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39 repository.getManifest().walk(new HgManifest.Inspector() {
a620f0663a37 Collect tags for a file - improve performance of 'sparse' manifest reads
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40 private List<String> tagsAtRev;
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41 final Pool<String> filenamePool = new Pool<String>();
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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42 final Pool<Nodeid> nodeidPool = new Pool<Nodeid>();
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43
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44 public boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision) {
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45 Nodeid cset = clogrmap.revision(changelogRevision);
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46 tagsAtRev = tags.tags(cset);
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47 if (tagsAtRev.isEmpty()) {
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48 System.out.println("Can't happen, provided we iterate over revisions with tags only");
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49 }
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50 return true;
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51 }
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52
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53 public boolean next(Nodeid nid, String fname, String flags) {
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54 fname = filenamePool.unify(fname);
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55 nid = nodeidPool.unify(nid);
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56 Map<TagInfo, Nodeid> m = file2tag2rev.get(fname);
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57 if (m == null) {
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58 file2tag2rev.put(fname, m = new HashMap<TagInfo, Nodeid>());
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59 }
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60 for (String tag : tagsAtRev) {
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61 m.put(tags.getTags().get(tag), nid);
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62 }
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63 return true;
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64 }
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65
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66 public boolean end(int manifestRevision) {
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67 return true;
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68 }
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69
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70 }, tagLocalRevs);
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71 System.out.printf("Cache built: %d\n", System.currentTimeMillis() - start);
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72 //
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73 // look up specific file. This part is fast.
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74 final Path targetPath = Path.create("README");
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75 HgDataFile fileNode = repository.getFileNode(targetPath);
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76 // TODO if fileNode.isCopy, repeat for each getCopySourceName()
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77 for (int localFileRev = 0; localFileRev < fileNode.getRevisionCount(); localFileRev++) {
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78 Nodeid fileRev = fileNode.getRevision(localFileRev);
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79 int changesetLocalRev = fileNode.getChangesetLocalRevision(localFileRev);
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80 List<String> associatedTags = new LinkedList<String>();
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81 final Map<TagInfo, Nodeid> allTagsOfTheFile = file2tag2rev.get(targetPath.toString());
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82 for (Entry<TagInfo, Nodeid> e : allTagsOfTheFile.entrySet()) {
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83 Nodeid fileRevAtTag = e.getValue();
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84 if (fileRev.equals(fileRevAtTag)) {
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85 associatedTags.add(e.getKey().name());
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86 }
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87 }
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88 System.out.printf("%3d%7d%s\n", localFileRev, changesetLocalRev, associatedTags);
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89 }
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90 System.out.printf("Total time: %d", System.currentTimeMillis() - start);
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91 }
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92
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93 public static void main2(String[] args) throws HgException, CancelledException {
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94 final HgRepository repository = new HgLookup().detect(new File("/temp/hg/cpython"));
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95 final Path targetPath = Path.create("README");
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96 final HgTags tags = repository.getTags();
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97 final Map<String, HgTags.TagInfo> tagToInfo = tags.getTags();
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98 final HgManifest manifest = repository.getManifest();
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99 final Map<Nodeid, List<String>> changeSetRevisionToTags = new HashMap<Nodeid, List<String>>();
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100 final HgDataFile fileNode = repository.getFileNode(targetPath);
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101 for (String tagName : tagToInfo.keySet()) {
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102 final HgTags.TagInfo info = tagToInfo.get(tagName);
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103 final Nodeid nodeId = info.revision();
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104 // TODO: This is not correct as we can't be sure that file at the corresponding revision is actually our target file (which may have been renamed, etc.)
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105 final Nodeid fileRevision = manifest.getFileRevision(repository.getChangelog().getLocalRevision(nodeId), targetPath);
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106 if (fileRevision == null) {
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107 continue;
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108 }
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109
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110 final Nodeid changeSetRevision = fileNode.getChangesetRevision(fileRevision);
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111 List<String> revisionTags = changeSetRevisionToTags.get(changeSetRevision);
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112 if (revisionTags == null) {
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113 revisionTags = new ArrayList<String>();
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114 changeSetRevisionToTags.put(changeSetRevision, revisionTags);
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115 }
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116 revisionTags.add(tagName);
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117 }
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118
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119 final HgLogCommand logCommand = new HgLogCommand(repository);
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120 logCommand.file(targetPath, true);
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121 logCommand.execute(new HgChangesetHandler() {
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122 public void next(HgChangeset changeset) {
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123 if (changeset.getAffectedFiles().contains(targetPath)) {
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124 System.out.println(changeset.getRevision() + " " + changeSetRevisionToTags.get(changeset.getNodeid()));
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125 }
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126 }
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127 });
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128 }
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129 }