Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/RepositoryComparator.java @ 650:3b275cc2d2aa

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Push: phase4 - settle local and remote phases, push updated phases regardless of server publishing state, do not push secret changesets
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 28 Jun 2013 19:27:26 +0200
parents 14dac192aa26
children cd77bf51b562
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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 static org.tmatesoft.hg.core.Nodeid.NULL;
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20
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21 import java.util.ArrayList;
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22 import java.util.Arrays;
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23 import java.util.Collections;
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24 import java.util.HashMap;
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25 import java.util.HashSet;
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26 import java.util.LinkedList;
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27 import java.util.List;
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28 import java.util.ListIterator;
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29 import java.util.Map;
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30 import java.util.Map.Entry;
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31 import java.util.Set;
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32
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33 import org.tmatesoft.hg.core.HgRemoteConnectionException;
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34 import org.tmatesoft.hg.core.Nodeid;
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35 import org.tmatesoft.hg.repo.HgChangelog;
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36 import org.tmatesoft.hg.repo.HgInvalidStateException;
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37 import org.tmatesoft.hg.repo.HgParentChildMap;
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38 import org.tmatesoft.hg.repo.HgRemoteRepository;
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39 import org.tmatesoft.hg.repo.HgRemoteRepository.Range;
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40 import org.tmatesoft.hg.repo.HgRemoteRepository.RemoteBranch;
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41 import org.tmatesoft.hg.repo.HgRuntimeException;
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42 import org.tmatesoft.hg.util.CancelSupport;
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43 import org.tmatesoft.hg.util.CancelledException;
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44 import org.tmatesoft.hg.util.ProgressSupport;
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46 /**
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47 *
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48 * @author Artem Tikhomirov
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49 * @author TMate Software Ltd.
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50 */
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51 public class RepositoryComparator {
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52
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53 private final boolean debug = Boolean.parseBoolean(System.getProperty("hg4j.remote.debug"));
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54 private final HgParentChildMap<HgChangelog> localRepo;
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55 private final HgRemoteRepository remoteRepo;
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56 private List<Nodeid> common;
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57 private List<Nodeid> remoteHeads;
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58
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59 public RepositoryComparator(HgParentChildMap<HgChangelog> pwLocal, HgRemoteRepository hgRemote) {
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60 localRepo = pwLocal;
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61 remoteRepo = hgRemote;
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62 }
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63
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64 public RepositoryComparator compare(ProgressSupport progressSupport, CancelSupport cancelSupport) throws HgRemoteConnectionException, CancelledException {
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65 cancelSupport.checkCancelled();
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66 progressSupport.start(10);
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67 common = Collections.unmodifiableList(findCommonWithRemote());
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68 // sanity check
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69 for (Nodeid n : common) {
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70 if (!localRepo.knownNode(n)) {
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71 throw new HgInvalidStateException("Unknown node reported as common:" + n);
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72 }
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73 }
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74 progressSupport.done();
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75 return this;
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76 }
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78 public List<Nodeid> getCommon() {
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79 if (common == null) {
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80 throw new HgInvalidStateException("Call #compare(Object) first");
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81 }
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82 return common;
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83 }
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84
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85 public List<Nodeid> getRemoteHeads() {
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86 assert remoteHeads != null;
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87 return remoteHeads;
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88 }
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89
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90 /**
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91 * @return revisions that are children of common entries, i.e. revisions that are present on the local server and not on remote.
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92 */
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93 public List<Nodeid> getLocalOnlyRevisions() {
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94 final List<Nodeid> c = getCommon();
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95 if (c.isEmpty()) {
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96 return localRepo.all();
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97 } else {
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98 return localRepo.childrenOf(c);
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99 }
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100 }
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101
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102 /**
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103 * Similar to @link {@link #getLocalOnlyRevisions()}, use this one if you need access to changelog entry content, not
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104 * only its revision number.
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105 * @param inspector delegate to analyze changesets, shall not be <code>null</code>
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106 */
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107 public void visitLocalOnlyRevisions(HgChangelog.Inspector inspector) throws HgRuntimeException {
192
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108 if (inspector == null) {
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109 throw new IllegalArgumentException();
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110 }
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111 // one can use localRepo.childrenOf(getCommon()) and then iterate over nodeids, but there seems to be
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112 // another approach to get all changes after common:
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113 // find index of earliest revision, and report all that were later
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114 final HgChangelog changelog = localRepo.getRepo().getChangelog();
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115 int earliestRevision = Integer.MAX_VALUE;
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116 List<Nodeid> commonKnown = getCommon();
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117 for (Nodeid n : commonKnown) {
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118 if (!localRepo.hasChildren(n)) {
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119 // there might be (old) nodes, known both locally and remotely, with no children
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120 // hence, we don't need to consider their local revision number
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121 continue;
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122 }
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123 int lr = changelog.getRevisionIndex(n);
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124 if (lr < earliestRevision) {
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125 earliestRevision = lr;
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126 }
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127 }
203
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128 if (earliestRevision == Integer.MAX_VALUE) {
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129 // either there are no common nodes (known locally and at remote)
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130 // or no local children found (local is up to date). In former case, perhaps I shall bit return silently,
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131 // but check for possible wrong repo comparison (hs says 'repository is unrelated' if I try to
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132 // check in/out for a repo that has no common nodes.
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133 return;
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134 }
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135 if (earliestRevision < 0 || earliestRevision >= changelog.getLastRevision()) {
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136 throw new HgInvalidStateException(String.format("Invalid index of common known revision: %d in total of %d", earliestRevision, 1+changelog.getLastRevision()));
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137 }
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138 changelog.range(earliestRevision+1, changelog.getLastRevision(), inspector);
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139 }
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140
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41a778e3fd31 Issue 5: Facilities for progress and cancellation. More specific exceptions. Exceptions from callbacks as RuntimeException
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141 private List<Nodeid> findCommonWithRemote() throws HgRemoteConnectionException {
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14dac192aa26 Push: phase2 - upload bundle with changes to remote server
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142 remoteHeads = remoteRepo.heads();
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143 LinkedList<Nodeid> resultCommon = new LinkedList<Nodeid>(); // these remotes are known in local
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144 LinkedList<Nodeid> toQuery = new LinkedList<Nodeid>(); // these need further queries to find common
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145 for (Nodeid rh : remoteHeads) {
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146 if (localRepo.knownNode(rh)) {
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147 resultCommon.add(rh);
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148 } else {
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149 toQuery.add(rh);
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150 }
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151 }
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152 if (toQuery.isEmpty()) {
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153 return resultCommon;
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154 }
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155 LinkedList<RemoteBranch> checkUp2Head = new LinkedList<RemoteBranch>(); // branch.root and branch.head are of interest only.
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156 // these are branches with unknown head but known root, which might not be the last common known,
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157 // i.e. there might be children changeset that are also available at remote, [..?..common-head..remote-head] - need to
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158 // scroll up to common head.
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159 while (!toQuery.isEmpty()) {
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160 List<RemoteBranch> remoteBranches = remoteRepo.branches(toQuery); //head, root, first parent, second parent
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161 toQuery.clear();
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162 while(!remoteBranches.isEmpty()) {
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163 RemoteBranch rb = remoteBranches.remove(0);
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164 // I assume branches remote call gives branches with head equal to what I pass there, i.e.
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165 // that I don't need to check whether rb.head is unknown.
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166 if (localRepo.knownNode(rb.root)) {
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167 // we known branch start, common head is somewhere in its descendants line
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168 checkUp2Head.add(rb);
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169 } else {
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170 // dig deeper in the history, if necessary
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171 if (!rb.p1.isNull() && !localRepo.knownNode(rb.p1)) {
181
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172 toQuery.add(rb.p1);
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173 }
274
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174 if (!rb.p2.isNull() && !localRepo.knownNode(rb.p2)) {
181
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175 toQuery.add(rb.p2);
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176 }
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177 }
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178 }
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179 }
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180 // can't check nodes between checkUp2Head element and local heads, remote might have distinct descendants sequence
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181 for (RemoteBranch rb : checkUp2Head) {
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182 // rb.root is known locally
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183 List<Nodeid> remoteRevisions = remoteRepo.between(rb.head, rb.root);
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184 if (remoteRevisions.isEmpty()) {
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185 // head is immediate child
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186 resultCommon.add(rb.root);
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187 } else {
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188 // between gives result from head to root, I'd like to go in reverse direction
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189 Collections.reverse(remoteRevisions);
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190 Nodeid root = rb.root;
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191 while(!remoteRevisions.isEmpty()) {
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192 Nodeid n = remoteRevisions.remove(0);
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193 if (localRepo.knownNode(n)) {
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194 if (remoteRevisions.isEmpty()) {
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195 // this is the last known node before an unknown
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196 resultCommon.add(n);
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197 break;
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198 }
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199 if (remoteRevisions.size() == 1) {
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200 // there's only one left between known n and unknown head
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201 // this check is to save extra between query, not really essential
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202 Nodeid last = remoteRevisions.remove(0);
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203 resultCommon.add(localRepo.knownNode(last) ? last : n);
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204 break;
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205 }
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206 // might get handy for next between query, to narrow search down
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207 root = n;
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208 } else {
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209 remoteRevisions = remoteRepo.between(n, root);
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210 Collections.reverse(remoteRevisions);
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211 if (remoteRevisions.isEmpty()) {
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212 resultCommon.add(root);
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213 }
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214 }
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215 }
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216 }
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217 }
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218 // TODO ensure unique elements in the list
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219 return resultCommon;
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220 }
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221
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222 // somewhat similar to Outgoing.findCommonWithRemote()
215
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223 public List<BranchChain> calculateMissingBranches() throws HgRemoteConnectionException {
181
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224 List<Nodeid> remoteHeads = remoteRepo.heads();
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225 LinkedList<Nodeid> common = new LinkedList<Nodeid>(); // these remotes are known in local
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226 LinkedList<Nodeid> toQuery = new LinkedList<Nodeid>(); // these need further queries to find common
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227 for (Nodeid rh : remoteHeads) {
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228 if (localRepo.knownNode(rh)) {
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229 common.add(rh);
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230 } else {
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231 toQuery.add(rh);
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232 }
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233 }
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234 if (toQuery.isEmpty()) {
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235 return Collections.emptyList(); // no incoming changes
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236 }
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237 LinkedList<BranchChain> branches2load = new LinkedList<BranchChain>(); // return value
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238 // detailed comments are in Outgoing.findCommonWithRemote
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239 LinkedList<RemoteBranch> checkUp2Head = new LinkedList<RemoteBranch>();
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240 // records relation between branch head and its parent branch, if any
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241 HashMap<Nodeid, BranchChain> head2chain = new HashMap<Nodeid, BranchChain>();
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242 while (!toQuery.isEmpty()) {
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243 List<RemoteBranch> remoteBranches = remoteRepo.branches(toQuery); //head, root, first parent, second parent
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244 toQuery.clear();
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245 while(!remoteBranches.isEmpty()) {
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246 RemoteBranch rb = remoteBranches.remove(0);
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247 BranchChain chainElement = head2chain.get(rb.head);
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248 if (chainElement == null) {
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249 chainElement = new BranchChain(rb.head);
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250 // record this unknown branch to download later
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251 branches2load.add(chainElement);
184
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252 // the only chance we'll need chainElement in the head2chain is when we know this branch's root
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253 head2chain.put(rb.head, chainElement);
181
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254 }
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255 if (localRepo.knownNode(rb.root)) {
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256 // we known branch start, common head is somewhere in its descendants line
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257 checkUp2Head.add(rb);
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258 } else {
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259 chainElement.branchRoot = rb.root;
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260 // dig deeper in the history, if necessary
274
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261 boolean hasP1 = !rb.p1.isNull(), hasP2 = !rb.p2.isNull();
202
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262 if (hasP1 && !localRepo.knownNode(rb.p1)) {
181
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263 toQuery.add(rb.p1);
209
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264 // we might have seen parent node already, and recorded it as a branch chain
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265 // we shall reuse existing BC to get it completely initializer (head2chain map
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266 // on second put with the same key would leave first BC uninitialized.
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267
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268 // It seems there's no reason to be affraid (XXX although shall double-check)
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269 // that BC's chain would get corrupt (its p1 and p2 fields assigned twice with different values)
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270 // as parents are always the same (and likely, BC that is common would be the last unknown)
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271 BranchChain bc = head2chain.get(rb.p1);
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272 if (bc == null) {
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273 head2chain.put(rb.p1, bc = new BranchChain(rb.p1));
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274 }
210
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275 chainElement.p1 = bc;
181
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276 }
202
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277 if (hasP2 && !localRepo.knownNode(rb.p2)) {
181
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278 toQuery.add(rb.p2);
209
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279 BranchChain bc = head2chain.get(rb.p2);
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280 if (bc == null) {
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281 head2chain.put(rb.p2, bc = new BranchChain(rb.p2));
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282 }
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283 chainElement.p2 = bc;
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284 }
202
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285 if (!hasP1 && !hasP2) {
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286 // special case, when we do incoming against blank repository, chainElement.branchRoot
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287 // is first unknown element (revision 0). We need to add another fake BranchChain
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288 // to fill the promise that terminal BranchChain has branchRoot that is known both locally and remotely
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289 BranchChain fake = new BranchChain(NULL);
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290 fake.branchRoot = NULL;
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291 chainElement.p1 = chainElement.p2 = fake;
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292 }
181
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293 }
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294 }
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295 }
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296 for (RemoteBranch rb : checkUp2Head) {
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297 Nodeid h = rb.head;
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298 Nodeid r = rb.root;
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299 int watchdog = 1000;
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300 assert head2chain.containsKey(h);
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301 BranchChain bc = head2chain.get(h);
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302 assert bc != null : h.toString();
181
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303 // if we know branch root locally, there could be no parent branch chain elements.
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304 assert bc.p1 == null;
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305 assert bc.p2 == null;
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306 do {
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307 List<Nodeid> between = remoteRepo.between(h, r);
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308 if (between.isEmpty()) {
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309 bc.branchRoot = r;
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310 break;
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311 } else {
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312 Collections.reverse(between);
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313 for (Nodeid n : between) {
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314 if (localRepo.knownNode(n)) {
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315 r = n;
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316 } else {
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317 h = n;
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318 break;
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319 }
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320 }
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321 Nodeid lastInBetween = between.get(between.size() - 1);
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322 if (r.equals(lastInBetween)) {
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323 bc.branchRoot = r;
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324 break;
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325 } else if (h.equals(lastInBetween)) { // the only chance for current head pointer to point to the sequence tail
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326 // is when r is second from the between list end (iow, head,1,[2],4,8...,root)
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327 bc.branchRoot = r;
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328 break;
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329 }
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330 }
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331 } while(--watchdog > 0);
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332 if (watchdog == 0) {
423
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333 throw new HgInvalidStateException(String.format("Can't narrow down branch [%s, %s]", rb.head.shortNotation(), rb.root.shortNotation()));
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334 }
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335 }
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336 if (debug) {
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1bf0a5af2d5d Conditional debug printouts
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337 System.out.println("calculateMissingBranches:");
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338 for (BranchChain bc : branches2load) {
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339 bc.dump();
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340 }
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341 }
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342 return branches2load;
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343 }
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344
202
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345 // root and head (and all between) are unknown for each chain element but last (terminal), which has known root (revision
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346 // known to be locally and at remote server
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347 // alternative would be to keep only unknown elements (so that promise of calculateMissingBranches would be 100% true), but that
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348 // seems to complicate the method, while being useful only for the case when we ask incoming for an empty repository (i.e.
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349 // where branch chain return all nodes, -1..tip.
181
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350 public static final class BranchChain {
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351 // when we construct a chain, we know head which is missing locally, hence init it right away.
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352 // as for root (branch unknown start), we might happen to have one locally, and need further digging to find out right branch start
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353 public final Nodeid branchHead;
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354 public Nodeid branchRoot;
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355 // either of these can be null, or both.
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356 // although RemoteBranch has either both parents null, or both non-null, when we construct a chain
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357 // we might encounter that we locally know one of branch's parent, hence in the chain corresponding field will be blank.
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358 public BranchChain p1;
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359 public BranchChain p2;
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360
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361 public BranchChain(Nodeid head) {
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362 assert head != null;
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363 branchHead = head;
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364 }
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365 public boolean isTerminal() {
202
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366 return p1 == null && p2 == null; // either can be null, see comment above. Terminal is only when no way to descent
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367 }
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368
202
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369 // true when this BranchChain is a branch that spans up to very start of the repository
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370 // Thus, the only common revision is NULL, recorded in a fake BranchChain object shared between p1 and p2
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371 /*package-local*/ boolean isRepoStart() {
274
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372 return p1 == p2 && p1 != null && p1.branchHead == p1.branchRoot && p1.branchHead.isNull();
202
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373 }
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374
181
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375 @Override
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376 public String toString() {
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377 return String.format("BranchChain [%s, %s]", branchRoot, branchHead);
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378 }
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379
206
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380 void dump() {
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381 System.out.println(toString());
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382 internalDump(" ");
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383 }
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384
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385 private void internalDump(String prefix) {
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386 if (p1 != null) {
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387 System.out.println(prefix + p1.toString());
210
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388 } else if (p2 != null) {
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389 System.out.println(prefix + "NONE?!");
181
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390 }
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391 if (p2 != null) {
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392 System.out.println(prefix + p2.toString());
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393 } else if (p1 != null) {
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394 System.out.println(prefix + "NONE?!");
181
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395 }
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396 prefix += " ";
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397 if (p1 != null) {
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398 p1.internalDump(prefix);
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399 }
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400 if (p2 != null) {
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401 p2.internalDump(prefix);
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402 }
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403 }
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404 }
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405
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406 /**
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407 * @return list of nodeids from branchRoot to branchHead, inclusive. IOW, first element of the list is always root of the branch
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408 */
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409 public List<Nodeid> completeBranch(final Nodeid branchRoot, final Nodeid branchHead) throws HgRemoteConnectionException {
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410 class DataEntry {
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411 public final Nodeid queryHead;
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412 public final int headIndex;
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413 public List<Nodeid> entries;
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414
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415 public DataEntry(Nodeid head, int index, List<Nodeid> data) {
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416 queryHead = head;
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417 headIndex = index;
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418 entries = data;
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419 }
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420 };
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421
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422 List<Nodeid> initial = remoteRepo.between(branchHead, branchRoot);
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423 Nodeid[] result = new Nodeid[1 + (1 << initial.size())];
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424 result[0] = branchHead;
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425 int rootIndex = -1; // index in the result, where to place branche's root.
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426 if (initial.isEmpty()) {
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427 rootIndex = 1;
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428 } else if (initial.size() == 1) {
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429 rootIndex = 2;
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430 }
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431 LinkedList<DataEntry> datas = new LinkedList<DataEntry>();
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432 // DataEntry in datas has entries list filled with 'between' data, whereas
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433 // DataEntry in toQuery keeps only nodeid and its index, with entries to be initialized before
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434 // moving to datas.
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435 LinkedList<DataEntry> toQuery = new LinkedList<DataEntry>();
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436 //
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437 datas.add(new DataEntry(branchHead, 0, initial));
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438 int totalQueries = 1;
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439 HashSet<Nodeid> queried = new HashSet<Nodeid>();
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440 while(!datas.isEmpty()) {
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441 // keep record of those planned to be queried next time we call between()
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442 // although may keep these in queried, if really don't want separate collection
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443 HashSet<Nodeid> scheduled = new HashSet<Nodeid>();
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444 do {
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445 DataEntry de = datas.removeFirst();
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446 // populate result with discovered elements between de.qiueryRoot and branch's head
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447 for (int i = 1, j = 0; j < de.entries.size(); i = i << 1, j++) {
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448 int idx = de.headIndex + i;
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449 result[idx] = de.entries.get(j);
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450 }
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451 // form next query entries from new unknown elements
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452 if (de.entries.size() > 1) {
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453 /* when entries has only one element, it means de.queryRoot was at head-2 position, and thus
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454 * no new information can be obtained. E.g. when it's 2, it might be case of [0..4] query with
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455 * [1,2] result, and we need one more query to get element 3.
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456 */
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457 for (int i =1, j = 0; j < de.entries.size(); i = i<<1, j++) {
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458 int idx = de.headIndex + i;
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459 Nodeid x = de.entries.get(j);
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460 if (!queried.contains(x) && !scheduled.contains(x) && (rootIndex == -1 || rootIndex - de.headIndex > 1)) {
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461 /*queries for elements right before head is senseless, but unless we know head's index, do it anyway*/
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462 toQuery.add(new DataEntry(x, idx, null));
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463 scheduled.add(x);
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464 }
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465 }
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466 }
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467 } while (!datas.isEmpty());
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468 if (!toQuery.isEmpty()) {
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469 totalQueries++;
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470 }
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471 // for each query, create an between request range, keep record Range->DataEntry to know range's start index
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472 LinkedList<HgRemoteRepository.Range> betweenBatch = new LinkedList<HgRemoteRepository.Range>();
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473 HashMap<HgRemoteRepository.Range, DataEntry> rangeToEntry = new HashMap<HgRemoteRepository.Range, DataEntry>();
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474 for (DataEntry de : toQuery) {
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475 queried.add(de.queryHead);
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476 HgRemoteRepository.Range r = new HgRemoteRepository.Range(branchRoot, de.queryHead);
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477 betweenBatch.add(r);
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478 rangeToEntry.put(r, de);
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479 }
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480 if (!betweenBatch.isEmpty()) {
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481 Map<Range, List<Nodeid>> between = remoteRepo.between(betweenBatch);
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482 for (Entry<Range, List<Nodeid>> e : between.entrySet()) {
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483 DataEntry de = rangeToEntry.get(e.getKey());
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484 assert de != null;
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485 de.entries = e.getValue();
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486 if (rootIndex == -1 && de.entries.size() == 1) {
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487 // returned sequence of length 1 means we used element from [head-2] as root
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488 int numberOfElementsExcludingRootAndHead = de.headIndex + 1;
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489 rootIndex = numberOfElementsExcludingRootAndHead + 1;
207
1bf0a5af2d5d Conditional debug printouts
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490 if (debug) {
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491 System.out.printf("On query %d found out exact number of missing elements: %d\n", totalQueries, numberOfElementsExcludingRootAndHead);
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492 }
181
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493 }
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494 datas.add(de); // queue up to record result and construct further requests
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495 }
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496 betweenBatch.clear();
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497 rangeToEntry.clear();
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498 }
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499 toQuery.clear();
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500 }
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501 if (rootIndex == -1) {
425
48f993aa2f41 FIXMEs: exceptions, javadoc
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502 throw new HgInvalidStateException("Shall not happen, provided between output is correct");
181
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503 }
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504 result[rootIndex] = branchRoot;
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505 boolean resultOk = true;
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506 LinkedList<Nodeid> fromRootToHead = new LinkedList<Nodeid>();
423
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507 IntVector missing = new IntVector();
181
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508 for (int i = 0; i <= rootIndex; i++) {
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509 Nodeid n = result[i];
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510 if (n == null) {
423
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511 missing.add(i);
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512 resultOk = false;
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513 }
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514 fromRootToHead.addFirst(n); // reverse order
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515 }
207
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516 if (debug) {
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517 System.out.println("Total queries:" + totalQueries);
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518 }
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519 if (!resultOk) {
423
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520 assert missing.size() > 0;
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521 // TODO post-1.0 perhaps, there's better alternative than HgInvalidStateException, e.g. HgDataFormatException?
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522 throw new HgInvalidStateException(String.format("Missing elements with indexes: %s", Arrays.toString(missing.toArray())));
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523 }
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524 return fromRootToHead;
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525 }
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526
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527 /**
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528 * returns in order from branch root to head
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529 * for a non-empty BranchChain, shall return modifiable list
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530 */
295
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531 public List<Nodeid> visitBranches(BranchChain bc) throws HgRemoteConnectionException {
192
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532 if (bc == null) {
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533 return Collections.emptyList();
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534 }
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535 List<Nodeid> mine = completeBranch(bc.branchRoot, bc.branchHead);
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536 if (bc.isTerminal() || bc.isRepoStart()) {
192
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537 return mine;
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538 }
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539 List<Nodeid> parentBranch1 = visitBranches(bc.p1);
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540 List<Nodeid> parentBranch2 = visitBranches(bc.p2);
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541 // merge
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542 LinkedList<Nodeid> merged = new LinkedList<Nodeid>();
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543 ListIterator<Nodeid> i1 = parentBranch1.listIterator(), i2 = parentBranch2.listIterator();
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544 while (i1.hasNext() && i2.hasNext()) {
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545 Nodeid n1 = i1.next();
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546 Nodeid n2 = i2.next();
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547 if (n1.equals(n2)) {
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548 merged.addLast(n1);
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549 } else {
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550 // first different => add both, and continue adding both tails sequentially
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551 merged.add(n2);
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552 merged.add(n1);
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553 break;
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554 }
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555 }
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556 // copy rest of second parent branch
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557 while (i2.hasNext()) {
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558 merged.add(i2.next());
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559 }
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560 // copy rest of first parent branch
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561 while (i1.hasNext()) {
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562 merged.add(i1.next());
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563 }
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564 //
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565 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(mine.size() + merged.size());
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566 rv.addAll(merged);
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567 rv.addAll(mine);
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568 return rv;
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569 }
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570
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571 public void collectKnownRoots(BranchChain bc, Set<Nodeid> result) {
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572 if (bc == null) {
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573 return;
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574 }
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575 if (bc.isTerminal()) {
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576 result.add(bc.branchRoot);
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577 return;
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578 }
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diff changeset
579 if (bc.isRepoStart()) {
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580 return;
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581 }
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582 collectKnownRoots(bc.p1, result);
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583 collectKnownRoots(bc.p2, result);
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584 }
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585 }