annotate src/org/tmatesoft/hg/internal/RepositoryComparator.java @ 697:24f4efedc9d5

Respect the fact ssh and http protocols use different compression approach to sent changegroup data
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 06 Aug 2013 13:34:34 +0200
parents 12a4f60ea972
children 822f3a83ff57
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.util.CancelSupport;
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42 import org.tmatesoft.hg.util.CancelledException;
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43 import org.tmatesoft.hg.util.ProgressSupport;
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45 /**
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46 *
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47 * @author Artem Tikhomirov
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48 * @author TMate Software Ltd.
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49 */
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50 public class RepositoryComparator {
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51
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52 private final boolean debug = Boolean.parseBoolean(System.getProperty("hg4j.remote.debug"));
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53 private final HgParentChildMap<HgChangelog> localRepo;
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54 private final HgRemoteRepository remoteRepo;
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55 private List<Nodeid> common;
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56 private List<Nodeid> remoteHeads;
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57
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58 public RepositoryComparator(HgParentChildMap<HgChangelog> pwLocal, HgRemoteRepository hgRemote) {
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59 localRepo = pwLocal;
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60 remoteRepo = hgRemote;
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61 }
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62
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63 public RepositoryComparator compare(ProgressSupport progressSupport, CancelSupport cancelSupport) throws HgRemoteConnectionException, CancelledException {
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64 cancelSupport.checkCancelled();
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65 progressSupport.start(10);
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66 common = Collections.unmodifiableList(findCommonWithRemote());
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67 // sanity check
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68 for (Nodeid n : common) {
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69 if (!localRepo.knownNode(n)) {
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70 throw new HgInvalidStateException("Unknown node reported as common:" + n);
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71 }
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72 }
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73 progressSupport.done();
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74 return this;
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75 }
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77 public List<Nodeid> getCommon() {
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78 if (common == null) {
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79 throw new HgInvalidStateException("Call #compare(Object) first");
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80 }
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81 return common;
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82 }
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83
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84 public List<Nodeid> getRemoteHeads() {
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85 assert remoteHeads != null;
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86 return remoteHeads;
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87 }
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88
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89 /**
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90 * @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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91 */
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92 public List<Nodeid> getLocalOnlyRevisions() {
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93 final List<Nodeid> c = getCommon();
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94 if (c.isEmpty()) {
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95 return localRepo.all();
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96 } else {
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97 final RevisionSet rsCommon = new RevisionSet(c);
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98 final RevisionSet localHeads = new RevisionSet(localRepo.heads());
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99 final List<Nodeid> commonChildren = localRepo.childrenOf(c);
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100 final RevisionSet rsCommonChildren = new RevisionSet(commonChildren);
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101 // check if there's any revision in the repository that doesn't trace to common
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102 // e.g. branches from one of common ancestors
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103 RevisionSet headsNotFromCommon = localHeads.subtract(rsCommonChildren).subtract(rsCommon);
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104 if (headsNotFromCommon.isEmpty()) {
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105 return commonChildren;
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106 }
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107 RevisionSet all = new RevisionSet(localRepo.all());
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108 // need outgoing := ancestors(missing) - ancestors(common):
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109 RevisionSet rsAncestors = all.ancestors(headsNotFromCommon, localRepo);
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110 // #ancestors gives only parents, we need terminating children as well
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111 rsAncestors = rsAncestors.union(headsNotFromCommon);
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112 final RevisionSet rsAncestorsCommon = all.ancestors(rsCommon, localRepo);
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113 RevisionSet outgoing = rsAncestors.subtract(rsAncestorsCommon).subtract(rsCommon);
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114 // outgoing keeps children that spined off prior to common revisions
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115 return outgoing.union(rsCommonChildren).asList();
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116 }
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117 }
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118
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119 private List<Nodeid> findCommonWithRemote() throws HgRemoteConnectionException {
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120 remoteHeads = remoteRepo.heads();
181
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121 LinkedList<Nodeid> resultCommon = new LinkedList<Nodeid>(); // these remotes are known in local
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122 LinkedList<Nodeid> toQuery = new LinkedList<Nodeid>(); // these need further queries to find common
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123 for (Nodeid rh : remoteHeads) {
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124 if (localRepo.knownNode(rh)) {
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125 resultCommon.add(rh);
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126 } else {
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127 toQuery.add(rh);
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128 }
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129 }
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130 if (toQuery.isEmpty()) {
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131 return resultCommon;
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132 }
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133 LinkedList<RemoteBranch> checkUp2Head = new LinkedList<RemoteBranch>(); // branch.root and branch.head are of interest only.
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134 // these are branches with unknown head but known root, which might not be the last common known,
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135 // i.e. there might be children changeset that are also available at remote, [..?..common-head..remote-head] - need to
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136 // scroll up to common head.
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137 while (!toQuery.isEmpty()) {
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138 List<RemoteBranch> remoteBranches = remoteRepo.branches(toQuery); //head, root, first parent, second parent
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139 toQuery.clear();
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140 while(!remoteBranches.isEmpty()) {
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141 RemoteBranch rb = remoteBranches.remove(0);
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142 // I assume branches remote call gives branches with head equal to what I pass there, i.e.
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143 // that I don't need to check whether rb.head is unknown.
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144 if (localRepo.knownNode(rb.root)) {
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145 // we known branch start, common head is somewhere in its descendants line
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146 checkUp2Head.add(rb);
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147 } else {
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148 // dig deeper in the history, if necessary
274
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149 if (!rb.p1.isNull() && !localRepo.knownNode(rb.p1)) {
181
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150 toQuery.add(rb.p1);
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151 }
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152 if (!rb.p2.isNull() && !localRepo.knownNode(rb.p2)) {
181
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153 toQuery.add(rb.p2);
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154 }
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155 }
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156 }
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157 }
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158 // can't check nodes between checkUp2Head element and local heads, remote might have distinct descendants sequence
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159 for (RemoteBranch rb : checkUp2Head) {
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160 // rb.root is known locally
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161 List<Nodeid> remoteRevisions = remoteRepo.between(rb.head, rb.root);
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162 if (remoteRevisions.isEmpty()) {
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163 // head is immediate child
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164 resultCommon.add(rb.root);
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165 } else {
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166 // between gives result from head to root, I'd like to go in reverse direction
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167 Collections.reverse(remoteRevisions);
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168 Nodeid root = rb.root;
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169 while(!remoteRevisions.isEmpty()) {
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170 Nodeid n = remoteRevisions.remove(0);
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171 if (localRepo.knownNode(n)) {
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172 if (remoteRevisions.isEmpty()) {
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173 // this is the last known node before an unknown
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174 resultCommon.add(n);
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175 break;
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176 }
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177 if (remoteRevisions.size() == 1) {
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178 // there's only one left between known n and unknown head
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179 // this check is to save extra between query, not really essential
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180 Nodeid last = remoteRevisions.remove(0);
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181 resultCommon.add(localRepo.knownNode(last) ? last : n);
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182 break;
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183 }
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184 // might get handy for next between query, to narrow search down
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185 root = n;
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186 } else {
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187 remoteRevisions = remoteRepo.between(n, root);
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188 Collections.reverse(remoteRevisions);
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189 if (remoteRevisions.isEmpty()) {
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190 resultCommon.add(root);
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191 }
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192 }
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193 }
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194 }
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195 }
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196 // TODO ensure unique elements in the list
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197 return resultCommon;
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198 }
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199
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200 // somewhat similar to Outgoing.findCommonWithRemote()
215
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201 public List<BranchChain> calculateMissingBranches() throws HgRemoteConnectionException {
181
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202 List<Nodeid> remoteHeads = remoteRepo.heads();
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203 LinkedList<Nodeid> common = new LinkedList<Nodeid>(); // these remotes are known in local
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204 LinkedList<Nodeid> toQuery = new LinkedList<Nodeid>(); // these need further queries to find common
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205 for (Nodeid rh : remoteHeads) {
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206 if (localRepo.knownNode(rh)) {
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207 common.add(rh);
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208 } else {
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209 toQuery.add(rh);
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210 }
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211 }
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212 if (toQuery.isEmpty()) {
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213 return Collections.emptyList(); // no incoming changes
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214 }
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215 LinkedList<BranchChain> branches2load = new LinkedList<BranchChain>(); // return value
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216 // detailed comments are in Outgoing.findCommonWithRemote
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217 LinkedList<RemoteBranch> checkUp2Head = new LinkedList<RemoteBranch>();
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218 // records relation between branch head and its parent branch, if any
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219 HashMap<Nodeid, BranchChain> head2chain = new HashMap<Nodeid, BranchChain>();
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220 while (!toQuery.isEmpty()) {
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221 List<RemoteBranch> remoteBranches = remoteRepo.branches(toQuery); //head, root, first parent, second parent
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222 toQuery.clear();
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223 while(!remoteBranches.isEmpty()) {
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224 RemoteBranch rb = remoteBranches.remove(0);
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225 BranchChain chainElement = head2chain.get(rb.head);
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226 if (chainElement == null) {
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227 chainElement = new BranchChain(rb.head);
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228 // record this unknown branch to download later
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229 branches2load.add(chainElement);
184
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230 // the only chance we'll need chainElement in the head2chain is when we know this branch's root
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231 head2chain.put(rb.head, chainElement);
181
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232 }
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233 if (localRepo.knownNode(rb.root)) {
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234 // we known branch start, common head is somewhere in its descendants line
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235 checkUp2Head.add(rb);
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236 } else {
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237 chainElement.branchRoot = rb.root;
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238 // dig deeper in the history, if necessary
274
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239 boolean hasP1 = !rb.p1.isNull(), hasP2 = !rb.p2.isNull();
202
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240 if (hasP1 && !localRepo.knownNode(rb.p1)) {
181
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241 toQuery.add(rb.p1);
209
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242 // we might have seen parent node already, and recorded it as a branch chain
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243 // we shall reuse existing BC to get it completely initializer (head2chain map
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244 // on second put with the same key would leave first BC uninitialized.
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245
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246 // It seems there's no reason to be affraid (XXX although shall double-check)
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247 // that BC's chain would get corrupt (its p1 and p2 fields assigned twice with different values)
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248 // as parents are always the same (and likely, BC that is common would be the last unknown)
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249 BranchChain bc = head2chain.get(rb.p1);
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250 if (bc == null) {
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251 head2chain.put(rb.p1, bc = new BranchChain(rb.p1));
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252 }
210
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253 chainElement.p1 = bc;
181
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254 }
202
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255 if (hasP2 && !localRepo.knownNode(rb.p2)) {
181
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256 toQuery.add(rb.p2);
209
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257 BranchChain bc = head2chain.get(rb.p2);
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258 if (bc == null) {
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259 head2chain.put(rb.p2, bc = new BranchChain(rb.p2));
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260 }
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261 chainElement.p2 = bc;
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262 }
202
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263 if (!hasP1 && !hasP2) {
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264 // special case, when we do incoming against blank repository, chainElement.branchRoot
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265 // is first unknown element (revision 0). We need to add another fake BranchChain
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266 // to fill the promise that terminal BranchChain has branchRoot that is known both locally and remotely
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267 BranchChain fake = new BranchChain(NULL);
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268 fake.branchRoot = NULL;
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269 chainElement.p1 = chainElement.p2 = fake;
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270 }
181
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271 }
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272 }
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273 }
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274 for (RemoteBranch rb : checkUp2Head) {
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275 Nodeid h = rb.head;
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276 Nodeid r = rb.root;
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277 int watchdog = 1000;
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278 assert head2chain.containsKey(h);
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279 BranchChain bc = head2chain.get(h);
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280 assert bc != null : h.toString();
181
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281 // if we know branch root locally, there could be no parent branch chain elements.
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282 assert bc.p1 == null;
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283 assert bc.p2 == null;
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284 do {
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285 List<Nodeid> between = remoteRepo.between(h, r);
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286 if (between.isEmpty()) {
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287 bc.branchRoot = r;
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288 break;
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289 } else {
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290 Collections.reverse(between);
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291 for (Nodeid n : between) {
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292 if (localRepo.knownNode(n)) {
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293 r = n;
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294 } else {
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295 h = n;
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296 break;
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297 }
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298 }
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299 Nodeid lastInBetween = between.get(between.size() - 1);
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300 if (r.equals(lastInBetween)) {
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301 bc.branchRoot = r;
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302 break;
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303 } else if (h.equals(lastInBetween)) { // the only chance for current head pointer to point to the sequence tail
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304 // is when r is second from the between list end (iow, head,1,[2],4,8...,root)
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305 bc.branchRoot = r;
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306 break;
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307 }
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308 }
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309 } while(--watchdog > 0);
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310 if (watchdog == 0) {
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311 throw new HgInvalidStateException(String.format("Can't narrow down branch [%s, %s]", rb.head.shortNotation(), rb.root.shortNotation()));
181
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312 }
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313 }
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314 if (debug) {
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315 System.out.println("calculateMissingBranches:");
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316 for (BranchChain bc : branches2load) {
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317 bc.dump();
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318 }
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319 }
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320 return branches2load;
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321 }
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322
202
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323 // root and head (and all between) are unknown for each chain element but last (terminal), which has known root (revision
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324 // known to be locally and at remote server
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325 // alternative would be to keep only unknown elements (so that promise of calculateMissingBranches would be 100% true), but that
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326 // 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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327 // where branch chain return all nodes, -1..tip.
181
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328 public static final class BranchChain {
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329 // when we construct a chain, we know head which is missing locally, hence init it right away.
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330 // 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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331 public final Nodeid branchHead;
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332 public Nodeid branchRoot;
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333 // either of these can be null, or both.
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334 // although RemoteBranch has either both parents null, or both non-null, when we construct a chain
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335 // 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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336 public BranchChain p1;
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337 public BranchChain p2;
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338
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339 public BranchChain(Nodeid head) {
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340 assert head != null;
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341 branchHead = head;
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342 }
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343 public boolean isTerminal() {
202
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344 return p1 == null && p2 == null; // either can be null, see comment above. Terminal is only when no way to descent
181
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345 }
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346
202
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347 // true when this BranchChain is a branch that spans up to very start of the repository
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348 // Thus, the only common revision is NULL, recorded in a fake BranchChain object shared between p1 and p2
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349 /*package-local*/ boolean isRepoStart() {
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350 return p1 == p2 && p1 != null && p1.branchHead == p1.branchRoot && p1.branchHead.isNull();
202
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351 }
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352
181
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353 @Override
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354 public String toString() {
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355 return String.format("BranchChain [%s, %s]", branchRoot, branchHead);
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356 }
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357
206
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358 void dump() {
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359 System.out.println(toString());
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360 internalDump(" ");
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361 }
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362
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363 private void internalDump(String prefix) {
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364 if (p1 != null) {
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365 System.out.println(prefix + p1.toString());
210
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366 } else if (p2 != null) {
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367 System.out.println(prefix + "NONE?!");
181
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368 }
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369 if (p2 != null) {
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370 System.out.println(prefix + p2.toString());
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371 } else if (p1 != null) {
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372 System.out.println(prefix + "NONE?!");
181
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373 }
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374 prefix += " ";
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375 if (p1 != null) {
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376 p1.internalDump(prefix);
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377 }
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378 if (p2 != null) {
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379 p2.internalDump(prefix);
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380 }
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381 }
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382 }
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383
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384 /**
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385 * @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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386 */
295
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387 public List<Nodeid> completeBranch(final Nodeid branchRoot, final Nodeid branchHead) throws HgRemoteConnectionException {
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388 class DataEntry {
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389 public final Nodeid queryHead;
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390 public final int headIndex;
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391 public List<Nodeid> entries;
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392
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393 public DataEntry(Nodeid head, int index, List<Nodeid> data) {
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394 queryHead = head;
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395 headIndex = index;
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396 entries = data;
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397 }
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398 };
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399
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400 List<Nodeid> initial = remoteRepo.between(branchHead, branchRoot);
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401 Nodeid[] result = new Nodeid[1 + (1 << initial.size())];
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402 result[0] = branchHead;
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403 int rootIndex = -1; // index in the result, where to place branche's root.
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404 if (initial.isEmpty()) {
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405 rootIndex = 1;
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406 } else if (initial.size() == 1) {
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407 rootIndex = 2;
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408 }
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409 LinkedList<DataEntry> datas = new LinkedList<DataEntry>();
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410 // DataEntry in datas has entries list filled with 'between' data, whereas
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411 // DataEntry in toQuery keeps only nodeid and its index, with entries to be initialized before
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412 // moving to datas.
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413 LinkedList<DataEntry> toQuery = new LinkedList<DataEntry>();
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414 //
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415 datas.add(new DataEntry(branchHead, 0, initial));
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416 int totalQueries = 1;
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417 HashSet<Nodeid> queried = new HashSet<Nodeid>();
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418 while(!datas.isEmpty()) {
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419 // keep record of those planned to be queried next time we call between()
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420 // although may keep these in queried, if really don't want separate collection
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421 HashSet<Nodeid> scheduled = new HashSet<Nodeid>();
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422 do {
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423 DataEntry de = datas.removeFirst();
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424 // populate result with discovered elements between de.qiueryRoot and branch's head
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425 for (int i = 1, j = 0; j < de.entries.size(); i = i << 1, j++) {
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426 int idx = de.headIndex + i;
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427 result[idx] = de.entries.get(j);
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428 }
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429 // form next query entries from new unknown elements
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430 if (de.entries.size() > 1) {
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431 /* when entries has only one element, it means de.queryRoot was at head-2 position, and thus
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432 * 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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433 * [1,2] result, and we need one more query to get element 3.
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434 */
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435 for (int i =1, j = 0; j < de.entries.size(); i = i<<1, j++) {
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436 int idx = de.headIndex + i;
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437 Nodeid x = de.entries.get(j);
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438 if (!queried.contains(x) && !scheduled.contains(x) && (rootIndex == -1 || rootIndex - de.headIndex > 1)) {
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439 /*queries for elements right before head is senseless, but unless we know head's index, do it anyway*/
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440 toQuery.add(new DataEntry(x, idx, null));
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441 scheduled.add(x);
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442 }
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443 }
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444 }
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445 } while (!datas.isEmpty());
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446 if (!toQuery.isEmpty()) {
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447 totalQueries++;
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448 }
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449 // for each query, create an between request range, keep record Range->DataEntry to know range's start index
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450 LinkedList<HgRemoteRepository.Range> betweenBatch = new LinkedList<HgRemoteRepository.Range>();
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451 HashMap<HgRemoteRepository.Range, DataEntry> rangeToEntry = new HashMap<HgRemoteRepository.Range, DataEntry>();
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452 for (DataEntry de : toQuery) {
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453 queried.add(de.queryHead);
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454 HgRemoteRepository.Range r = new HgRemoteRepository.Range(branchRoot, de.queryHead);
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455 betweenBatch.add(r);
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456 rangeToEntry.put(r, de);
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457 }
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458 if (!betweenBatch.isEmpty()) {
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459 Map<Range, List<Nodeid>> between = remoteRepo.between(betweenBatch);
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460 for (Entry<Range, List<Nodeid>> e : between.entrySet()) {
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461 DataEntry de = rangeToEntry.get(e.getKey());
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462 assert de != null;
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463 de.entries = e.getValue();
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464 if (rootIndex == -1 && de.entries.size() == 1) {
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465 // returned sequence of length 1 means we used element from [head-2] as root
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466 int numberOfElementsExcludingRootAndHead = de.headIndex + 1;
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467 rootIndex = numberOfElementsExcludingRootAndHead + 1;
207
1bf0a5af2d5d Conditional debug printouts
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468 if (debug) {
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469 System.out.printf("On query %d found out exact number of missing elements: %d\n", totalQueries, numberOfElementsExcludingRootAndHead);
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470 }
181
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471 }
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472 datas.add(de); // queue up to record result and construct further requests
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473 }
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474 betweenBatch.clear();
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475 rangeToEntry.clear();
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476 }
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477 toQuery.clear();
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478 }
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479 if (rootIndex == -1) {
425
48f993aa2f41 FIXMEs: exceptions, javadoc
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480 throw new HgInvalidStateException("Shall not happen, provided between output is correct");
181
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481 }
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482 result[rootIndex] = branchRoot;
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483 boolean resultOk = true;
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484 LinkedList<Nodeid> fromRootToHead = new LinkedList<Nodeid>();
423
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485 IntVector missing = new IntVector();
181
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486 for (int i = 0; i <= rootIndex; i++) {
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487 Nodeid n = result[i];
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488 if (n == null) {
423
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489 missing.add(i);
181
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490 resultOk = false;
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491 }
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492 fromRootToHead.addFirst(n); // reverse order
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493 }
207
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494 if (debug) {
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495 System.out.println("Total queries:" + totalQueries);
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496 }
181
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497 if (!resultOk) {
423
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498 assert missing.size() > 0;
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499 // TODO post-1.0 perhaps, there's better alternative than HgInvalidStateException, e.g. HgDataFormatException?
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500 throw new HgInvalidStateException(String.format("Missing elements with indexes: %s", Arrays.toString(missing.toArray())));
181
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501 }
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502 return fromRootToHead;
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503 }
192
e5407b5a586a Incoming and Outgoing commands are alive
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504
e5407b5a586a Incoming and Outgoing commands are alive
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505 /**
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506 * returns in order from branch root to head
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507 * for a non-empty BranchChain, shall return modifiable list
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508 */
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509 public List<Nodeid> visitBranches(BranchChain bc) throws HgRemoteConnectionException {
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510 if (bc == null) {
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511 return Collections.emptyList();
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512 }
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513 List<Nodeid> mine = completeBranch(bc.branchRoot, bc.branchHead);
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514 if (bc.isTerminal() || bc.isRepoStart()) {
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515 return mine;
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516 }
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517 List<Nodeid> parentBranch1 = visitBranches(bc.p1);
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518 List<Nodeid> parentBranch2 = visitBranches(bc.p2);
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519 // merge
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520 LinkedList<Nodeid> merged = new LinkedList<Nodeid>();
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521 ListIterator<Nodeid> i1 = parentBranch1.listIterator(), i2 = parentBranch2.listIterator();
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522 while (i1.hasNext() && i2.hasNext()) {
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523 Nodeid n1 = i1.next();
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524 Nodeid n2 = i2.next();
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525 if (n1.equals(n2)) {
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526 merged.addLast(n1);
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527 } else {
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528 // first different => add both, and continue adding both tails sequentially
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529 merged.add(n2);
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530 merged.add(n1);
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531 break;
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532 }
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533 }
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534 // copy rest of second parent branch
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535 while (i2.hasNext()) {
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536 merged.add(i2.next());
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537 }
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538 // copy rest of first parent branch
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539 while (i1.hasNext()) {
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540 merged.add(i1.next());
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541 }
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542 //
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543 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(mine.size() + merged.size());
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544 rv.addAll(merged);
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545 rv.addAll(mine);
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546 return rv;
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547 }
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548
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549 public void collectKnownRoots(BranchChain bc, Set<Nodeid> result) {
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550 if (bc == null) {
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551 return;
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552 }
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553 if (bc.isTerminal()) {
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554 result.add(bc.branchRoot);
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555 return;
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556 }
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557 if (bc.isRepoStart()) {
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558 return;
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559 }
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560 collectKnownRoots(bc.p1, result);
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561 collectKnownRoots(bc.p2, result);
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562 }
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563 }