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annotate src/org/tmatesoft/hg/internal/ManifestRevision.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 6dbbc53fc46d
children ee8264d80747
rev   line source
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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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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.HgBadStateException;
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23 import org.tmatesoft.hg.core.Nodeid;
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24 import org.tmatesoft.hg.repo.HgManifest;
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25 import org.tmatesoft.hg.util.Path;
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26
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27 /**
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28 * Specific revision of the manifest.
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29 * Note, suited to keep single revision only ({@link #changeset()}).
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 public final class ManifestRevision implements HgManifest.Inspector2 {
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35 private final TreeMap<Path, Nodeid> idsMap;
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36 private final TreeMap<Path, HgManifest.Flags> flagsMap;
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37 private final Pool<Nodeid> idsPool;
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38 private final Pool<Path> namesPool;
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39 private Nodeid changeset;
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40 private int changelogRev;
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41
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42 // optional pools for effective management of nodeids and filenames (they are likely
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43 // to be duplicated among different manifest revisions
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44 public ManifestRevision(Pool<Nodeid> nodeidPool, Pool<Path> filenamePool) {
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45 idsPool = nodeidPool;
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46 namesPool = filenamePool;
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47 idsMap = new TreeMap<Path, Nodeid>();
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48 flagsMap = new TreeMap<Path, HgManifest.Flags>();
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49 }
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50
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51 public Collection<Path> files() {
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52 return idsMap.keySet();
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53 }
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54
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55 public Nodeid nodeid(Path fname) {
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56 return idsMap.get(fname);
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57 }
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58
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59 public HgManifest.Flags flags(Path fname) {
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60 return flagsMap.get(fname);
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61 }
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62
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63 /**
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64 * @return identifier of the changeset this manifest revision corresponds to.
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65 */
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66 public Nodeid changeset() {
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67 return changeset;
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68 }
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69
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70 public int changesetLocalRev() {
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71 return changelogRev;
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72 }
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74 //
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75
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76 public boolean next(Nodeid nid, String fname, String flags) {
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77 throw new HgBadStateException(HgManifest.Inspector2.class.getName());
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78 }
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79
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80 public boolean next(Nodeid nid, Path fname, HgManifest.Flags flags) {
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81 if (namesPool != null) {
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82 fname = namesPool.unify(fname);
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83 }
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84 if (idsPool != null) {
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85 nid = idsPool.unify(nid);
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86 }
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87 idsMap.put(fname, nid);
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88 if (flags != null) {
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89 // TreeMap$Entry takes 32 bytes. No reason to keep null for such price
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90 // Alternatively, Map<Path, Pair<Nodeid, Flags>> might come as a solution
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91 // however, with low rate of elements with flags this would consume more memory
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92 // than two distinct maps (sizeof(Pair) == 16).
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93 // Map<Pair>: n*(32+16)
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94 // 2 Maps: n*32 + m*32 <-- consumes more with m>n/2
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95 flagsMap.put(fname, flags);
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96 }
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97 return true;
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98 }
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99
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100 public boolean end(int revision) {
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101 // in fact, this class cares about single revision
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102 return false;
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103 }
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104
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105 public boolean begin(int revision, Nodeid nid, int changelogRevision) {
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:
diff changeset
106 if (changeset != null) {
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:
diff changeset
107 idsMap.clear();
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:
diff changeset
108 flagsMap.clear();
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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109 }
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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110 changeset = nid;
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:
diff changeset
111 changelogRev = changelogRevision;
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:
diff changeset
112 return true;
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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113 }
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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114 }