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annotate src/org/tmatesoft/hg/core/ChangesetTransformer.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 a674b8590362
children ac8e1ce67730
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.core;
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18
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19 import java.util.Set;
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20
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21 import org.tmatesoft.hg.repo.HgChangelog;
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22 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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23 import org.tmatesoft.hg.repo.HgRepository;
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24 import org.tmatesoft.hg.repo.HgStatusCollector;
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25 import org.tmatesoft.hg.util.CancelSupport;
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26 import org.tmatesoft.hg.util.CancelledException;
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27 import org.tmatesoft.hg.util.PathPool;
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28 import org.tmatesoft.hg.util.PathRewrite;
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29 import org.tmatesoft.hg.util.ProgressSupport;
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30
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31 /**
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32 * Bridges {@link HgChangelog.RawChangeset} with high-level {@link HgChangeset} API
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33 * FIXME move to .internal
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 /*package-local*/ class ChangesetTransformer implements HgChangelog.Inspector {
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39 private final HgChangesetHandler handler;
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40 private final ProgressSupport progressHelper;
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41 private final CancelSupport cancelHelper;
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42 private final Transformation t;
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43 private Set<String> branches;
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44 private HgCallbackTargetException failure;
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45 private CancelledException cancellation;
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46
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47 // repo and delegate can't be null, parent walker can
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48 // ps and cs can't be null
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49 public ChangesetTransformer(HgRepository hgRepo, HgChangesetHandler delegate, HgChangelog.ParentWalker pw, ProgressSupport ps, CancelSupport cs) {
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50 if (hgRepo == null || delegate == null) {
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51 throw new IllegalArgumentException();
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52 }
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53 if (ps == null || cs == null) {
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54 throw new IllegalArgumentException();
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55 }
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56 HgStatusCollector statusCollector = new HgStatusCollector(hgRepo);
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57 t = new Transformation(statusCollector, pw);
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58 handler = delegate;
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59 cancelHelper = cs;
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60 progressHelper = ps;
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61 }
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62
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63 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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64 if (failure != null || cancellation != null) {
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65 return; // FIXME need a better way to stop iterating revlog
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66 }
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67 if (branches != null && !branches.contains(cset.branch())) {
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68 return;
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69 }
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70
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71 HgChangeset changeset = t.handle(revisionNumber, nodeid, cset);
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72 try {
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73 handler.next(changeset);
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74 progressHelper.worked(1);
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75 cancelHelper.checkCancelled();
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76 } catch (RuntimeException ex) {
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77 failure = new HgCallbackTargetException(ex).setRevision(nodeid).setRevisionNumber(revisionNumber);
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78 } catch (CancelledException ex) {
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79 cancellation = ex;
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80 }
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81 }
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83 public void checkFailure() throws HgCallbackTargetException, CancelledException {
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84 if (failure != null) {
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85 HgCallbackTargetException toThrow = failure;
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86 failure = null; // just in (otherwise unexpected) case this instance would get reused
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87 throw toThrow;
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88 }
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89 if (cancellation != null) {
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90 CancelledException toThrow = cancellation;
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91 cancellation = null;
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92 throw toThrow;
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93 }
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94 }
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95
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96 public void limitBranches(Set<String> branches) {
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97 this.branches = branches;
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98 }
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100 // part relevant to RawChangeset->HgChangeset transformation
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101 static class Transformation {
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102 private final HgChangeset changeset;
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103
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104 public Transformation(HgStatusCollector statusCollector, HgChangelog.ParentWalker pw) {
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105 // files listed in a changeset don't need their names to be rewritten (they are normalized already)
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106 PathPool pp = new PathPool(new PathRewrite.Empty());
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107 statusCollector.setPathPool(pp);
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108 changeset = new HgChangeset(statusCollector, pp);
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109 changeset.setParentHelper(pw);
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110 }
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111
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112 HgChangeset handle(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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113 changeset.init(revisionNumber, nodeid, cset);
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114 return changeset;
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115 }
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116 }
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117 }