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annotate src/org/tmatesoft/hg/internal/ManifestRevision.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 3fbfce107f94
children 6dbbc53fc46d
rev   line source
248
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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.internal;
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18
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19 import java.util.Collection;
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20 import java.util.TreeMap;
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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.repo.HgManifest;
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24
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25 /**
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26 * Specific revision of the manifest.
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27 * Note, suited to keep single revision only ({@link #changeset()}).
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 public final class ManifestRevision implements HgManifest.Inspector {
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33 private final TreeMap<String, Nodeid> idsMap;
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34 private final TreeMap<String, String> flagsMap;
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35 private final Pool<Nodeid> idsPool;
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36 private final Pool<String> namesPool;
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37 private Nodeid changeset;
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38 private int changelogRev;
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39
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40 // optional pools for effective management of nodeids and filenames (they are likely
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41 // to be duplicated among different manifest revisions
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42 public ManifestRevision(Pool<Nodeid> nodeidPool, Pool<String> filenamePool) {
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43 idsPool = nodeidPool;
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44 namesPool = filenamePool;
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45 idsMap = new TreeMap<String, Nodeid>();
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46 flagsMap = new TreeMap<String, String>();
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47 }
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48
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49 public Collection<String> files() {
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50 return idsMap.keySet();
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51 }
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52
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53 public Nodeid nodeid(String fname) {
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54 return idsMap.get(fname);
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55 }
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56
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57 public String flags(String fname) {
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58 return flagsMap.get(fname);
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59 }
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60
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61 /**
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62 * @return identifier of the changeset this manifest revision corresponds to.
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63 */
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64 public Nodeid changeset() {
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65 return changeset;
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66 }
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67
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68 public int changesetLocalRev() {
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69 return changelogRev;
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70 }
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71
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72 //
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73
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74 public boolean next(Nodeid nid, String fname, String flags) {
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75 if (namesPool != null) {
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76 fname = namesPool.unify(fname);
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77 }
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78 if (idsPool != null) {
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79 nid = idsPool.unify(nid);
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80 }
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81 idsMap.put(fname, nid);
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82 if (flags != null) {
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83 // TreeMap$Entry takes 32 bytes. No reason to keep null for such price
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84 // Perhaps, Map<String, Pair<Nodeid, String>> might be better solution
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85 flagsMap.put(fname, flags);
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86 }
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87 return true;
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88 }
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89
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90 public boolean end(int revision) {
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91 // in fact, this class cares about single revision
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92 return false;
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93 }
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94
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95 public boolean begin(int revision, Nodeid nid, int changelogRevision) {
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96 if (changeset != null) {
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97 idsMap.clear();
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98 flagsMap.clear();
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99 }
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100 changeset = nid;
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101 changelogRev = changelogRevision;
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102 return true;
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103 }
3fbfce107f94 Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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