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annotate src/org/tmatesoft/hg/internal/RepositoryComparator.java @ 183:9807bf8f3a9c

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Do not assume second parent can be set only when first one is set
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 13 Apr 2011 14:15:13 +0200
parents cd3371670f0b
children ec1820f64d2b
rev   line source
181
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import static org.tmatesoft.hg.core.Nodeid.NULL;
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21 import java.util.Collections;
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22 import java.util.HashMap;
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23 import java.util.HashSet;
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24 import java.util.LinkedList;
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25 import java.util.List;
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26 import java.util.Map;
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27 import java.util.Map.Entry;
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29 import org.tmatesoft.hg.core.HgBadStateException;
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30 import org.tmatesoft.hg.core.HgException;
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31 import org.tmatesoft.hg.core.Nodeid;
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32 import org.tmatesoft.hg.repo.HgChangelog;
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33 import org.tmatesoft.hg.repo.HgRemoteRepository;
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34 import org.tmatesoft.hg.repo.HgRemoteRepository.Range;
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35 import org.tmatesoft.hg.repo.HgRemoteRepository.RemoteBranch;
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36 import org.tmatesoft.hg.util.CancelSupport;
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37 import org.tmatesoft.hg.util.CancelledException;
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38 import org.tmatesoft.hg.util.ProgressSupport;
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39
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40 /**
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public class RepositoryComparator {
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46
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47 private final HgChangelog.ParentWalker localRepo;
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48 private final HgRemoteRepository remoteRepo;
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49 private List<Nodeid> common;
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50
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51 public RepositoryComparator(HgChangelog.ParentWalker pwLocal, HgRemoteRepository hgRemote) {
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52 localRepo = pwLocal;
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53 remoteRepo = hgRemote;
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54 }
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55
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56 public RepositoryComparator compare(Object context) throws HgException, CancelledException {
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57 ProgressSupport progressSupport = ProgressSupport.Factory.get(context);
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58 CancelSupport cancelSupport = CancelSupport.Factory.get(context);
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59 cancelSupport.checkCancelled();
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60 progressSupport.start(10);
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61 common = Collections.unmodifiableList(findCommonWithRemote());
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62 progressSupport.done();
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63 return this;
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64 }
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65
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66 public List<Nodeid> getCommon() {
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67 if (common == null) {
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68 throw new HgBadStateException("Call #compare(Object) first");
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69 }
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70 return common;
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71 }
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72
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73 private List<Nodeid> findCommonWithRemote() throws HgException {
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74 List<Nodeid> remoteHeads = remoteRepo.heads();
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75 LinkedList<Nodeid> resultCommon = new LinkedList<Nodeid>(); // these remotes are known in local
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76 LinkedList<Nodeid> toQuery = new LinkedList<Nodeid>(); // these need further queries to find common
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77 for (Nodeid rh : remoteHeads) {
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78 if (localRepo.knownNode(rh)) {
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79 resultCommon.add(rh);
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80 } else {
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81 toQuery.add(rh);
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82 }
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83 }
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84 if (toQuery.isEmpty()) {
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85 return resultCommon;
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86 }
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87 LinkedList<RemoteBranch> checkUp2Head = new LinkedList<RemoteBranch>(); // branch.root and branch.head are of interest only.
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88 // these are branches with unknown head but known root, which might not be the last common known,
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89 // i.e. there might be children changeset that are also available at remote, [..?..common-head..remote-head] - need to
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90 // scroll up to common head.
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91 while (!toQuery.isEmpty()) {
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92 List<RemoteBranch> remoteBranches = remoteRepo.branches(toQuery); //head, root, first parent, second parent
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93 toQuery.clear();
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94 while(!remoteBranches.isEmpty()) {
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95 RemoteBranch rb = remoteBranches.remove(0);
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96 // I assume branches remote call gives branches with head equal to what I pass there, i.e.
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97 // that I don't need to check whether rb.head is unknown.
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98 if (localRepo.knownNode(rb.root)) {
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99 // we known branch start, common head is somewhere in its descendants line
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100 checkUp2Head.add(rb);
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101 } else {
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102 // dig deeper in the history, if necessary
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103 if (!NULL.equals(rb.p1) && !localRepo.knownNode(rb.p1)) {
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104 toQuery.add(rb.p1);
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105 }
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106 if (!NULL.equals(rb.p2) && !localRepo.knownNode(rb.p2)) {
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107 toQuery.add(rb.p2);
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108 }
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109 }
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110 }
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111 }
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112 // can't check nodes between checkUp2Head element and local heads, remote might have distinct descendants sequence
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113 for (RemoteBranch rb : checkUp2Head) {
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114 // rb.root is known locally
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115 List<Nodeid> remoteRevisions = remoteRepo.between(rb.head, rb.root);
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116 if (remoteRevisions.isEmpty()) {
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117 // head is immediate child
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118 resultCommon.add(rb.root);
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119 } else {
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120 // between gives result from head to root, I'd like to go in reverse direction
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121 Collections.reverse(remoteRevisions);
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122 Nodeid root = rb.root;
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123 while(!remoteRevisions.isEmpty()) {
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124 Nodeid n = remoteRevisions.remove(0);
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125 if (localRepo.knownNode(n)) {
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126 if (remoteRevisions.isEmpty()) {
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127 // this is the last known node before an unknown
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128 resultCommon.add(n);
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129 break;
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130 }
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131 if (remoteRevisions.size() == 1) {
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132 // there's only one left between known n and unknown head
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133 // this check is to save extra between query, not really essential
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134 Nodeid last = remoteRevisions.remove(0);
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135 resultCommon.add(localRepo.knownNode(last) ? last : n);
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136 break;
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137 }
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138 // might get handy for next between query, to narrow search down
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139 root = n;
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140 } else {
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141 remoteRevisions = remoteRepo.between(n, root);
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142 Collections.reverse(remoteRevisions);
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143 if (remoteRevisions.isEmpty()) {
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144 resultCommon.add(root);
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145 }
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146 }
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147 }
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148 }
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149 }
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150 // TODO ensure unique elements in the list
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151 return resultCommon;
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152 }
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153
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154 // somewhat similar to Outgoing.findCommonWithRemote()
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155 public List<BranchChain> calculateMissingBranches() throws HgException {
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156 List<Nodeid> remoteHeads = remoteRepo.heads();
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157 LinkedList<Nodeid> common = new LinkedList<Nodeid>(); // these remotes are known in local
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158 LinkedList<Nodeid> toQuery = new LinkedList<Nodeid>(); // these need further queries to find common
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159 for (Nodeid rh : remoteHeads) {
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160 if (localRepo.knownNode(rh)) {
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161 common.add(rh);
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162 } else {
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163 toQuery.add(rh);
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164 }
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165 }
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166 if (toQuery.isEmpty()) {
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167 return Collections.emptyList(); // no incoming changes
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168 }
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169 LinkedList<BranchChain> branches2load = new LinkedList<BranchChain>(); // return value
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170 // detailed comments are in Outgoing.findCommonWithRemote
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171 LinkedList<RemoteBranch> checkUp2Head = new LinkedList<RemoteBranch>();
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172 // records relation between branch head and its parent branch, if any
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173 HashMap<Nodeid, BranchChain> head2chain = new HashMap<Nodeid, BranchChain>();
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174 while (!toQuery.isEmpty()) {
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175 List<RemoteBranch> remoteBranches = remoteRepo.branches(toQuery); //head, root, first parent, second parent
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176 toQuery.clear();
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177 while(!remoteBranches.isEmpty()) {
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178 RemoteBranch rb = remoteBranches.remove(0);
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179 BranchChain chainElement = head2chain.get(rb.head);
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180 if (chainElement == null) {
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181 chainElement = new BranchChain(rb.head);
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182 // record this unknown branch to download later
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183 branches2load.add(chainElement);
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184 }
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185 if (localRepo.knownNode(rb.root)) {
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186 // we known branch start, common head is somewhere in its descendants line
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187 checkUp2Head.add(rb);
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188 } else {
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189 chainElement.branchRoot = rb.root;
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190 // dig deeper in the history, if necessary
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191 if (!NULL.equals(rb.p1) && !localRepo.knownNode(rb.p1)) {
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192 toQuery.add(rb.p1);
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193 head2chain.put(rb.p1, chainElement.p1 = new BranchChain(rb.p1));
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194 }
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195 if (!NULL.equals(rb.p2) && !localRepo.knownNode(rb.p2)) {
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196 toQuery.add(rb.p2);
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197 head2chain.put(rb.p2, chainElement.p2 = new BranchChain(rb.p2));
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198 }
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199 }
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200 }
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201 }
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202 for (RemoteBranch rb : checkUp2Head) {
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203 Nodeid h = rb.head;
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204 Nodeid r = rb.root;
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205 int watchdog = 1000;
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206 BranchChain bc = head2chain.get(h);
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207 assert bc != null;
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208 // if we know branch root locally, there could be no parent branch chain elements.
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209 assert bc.p1 == null;
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210 assert bc.p2 == null;
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211 do {
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212 List<Nodeid> between = remoteRepo.between(h, r);
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213 if (between.isEmpty()) {
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214 bc.branchRoot = r;
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215 break;
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216 } else {
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217 Collections.reverse(between);
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218 for (Nodeid n : between) {
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219 if (localRepo.knownNode(n)) {
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220 r = n;
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221 } else {
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222 h = n;
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223 break;
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224 }
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225 }
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226 Nodeid lastInBetween = between.get(between.size() - 1);
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227 if (r.equals(lastInBetween)) {
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228 bc.branchRoot = r;
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229 break;
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230 } else if (h.equals(lastInBetween)) { // the only chance for current head pointer to point to the sequence tail
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231 // is when r is second from the between list end (iow, head,1,[2],4,8...,root)
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232 bc.branchRoot = r;
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233 break;
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234 }
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235 }
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236 } while(--watchdog > 0);
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237 if (watchdog == 0) {
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238 throw new HgBadStateException(String.format("Can't narrow down branch [%s, %s]", rb.head.shortNotation(), rb.root.shortNotation()));
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239 }
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240 }
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241 return branches2load;
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242 }
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243
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244 public static final class BranchChain {
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245 // when we construct a chain, we know head which is missing locally, hence init it right away.
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246 // 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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247 public final Nodeid branchHead;
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248 public Nodeid branchRoot;
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249 // either of these can be null, or both.
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250 // although RemoteBranch has either both parents null, or both non-null, when we construct a chain
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251 // 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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252 public BranchChain p1;
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253 public BranchChain p2;
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254
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255 public BranchChain(Nodeid head) {
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256 assert head != null;
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257 branchHead = head;
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258 }
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259 public boolean isTerminal() {
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260 return p1 == null || p2 == null;
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261 }
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262
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263 @Override
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264 public String toString() {
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265 return String.format("BranchChain [%s, %s]", branchRoot, branchHead);
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266 }
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267
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268 public void dump() {
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269 System.out.println(toString());
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270 internalDump(" ");
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271 }
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272
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273 private void internalDump(String prefix) {
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274 if (p1 != null) {
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275 System.out.println(prefix + p1.toString());
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276 }
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277 if (p2 != null) {
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278 System.out.println(prefix + p2.toString());
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279 }
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280 prefix += " ";
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281 if (p1 != null) {
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282 p1.internalDump(prefix);
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283 }
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284 if (p2 != null) {
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285 p2.internalDump(prefix);
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286 }
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287 }
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288 }
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289
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290 /**
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291 * @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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292 */
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293 public List<Nodeid> completeBranch(final Nodeid branchRoot, final Nodeid branchHead) throws HgException {
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294 class DataEntry {
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295 public final Nodeid queryHead;
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296 public final int headIndex;
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297 public List<Nodeid> entries;
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298
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299 public DataEntry(Nodeid head, int index, List<Nodeid> data) {
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300 queryHead = head;
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301 headIndex = index;
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302 entries = data;
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303 }
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304 };
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305
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306 List<Nodeid> initial = remoteRepo.between(branchHead, branchRoot);
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307 Nodeid[] result = new Nodeid[1 + (1 << initial.size())];
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308 result[0] = branchHead;
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309 int rootIndex = -1; // index in the result, where to place branche's root.
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310 if (initial.isEmpty()) {
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311 rootIndex = 1;
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312 } else if (initial.size() == 1) {
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313 rootIndex = 2;
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314 }
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315 LinkedList<DataEntry> datas = new LinkedList<DataEntry>();
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316 // DataEntry in datas has entries list filled with 'between' data, whereas
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317 // DataEntry in toQuery keeps only nodeid and its index, with entries to be initialized before
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318 // moving to datas.
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319 LinkedList<DataEntry> toQuery = new LinkedList<DataEntry>();
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320 //
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321 datas.add(new DataEntry(branchHead, 0, initial));
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322 int totalQueries = 1;
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323 HashSet<Nodeid> queried = new HashSet<Nodeid>();
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324 while(!datas.isEmpty()) {
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325 // keep record of those planned to be queried next time we call between()
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326 // although may keep these in queried, if really don't want separate collection
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327 HashSet<Nodeid> scheduled = new HashSet<Nodeid>();
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328 do {
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329 DataEntry de = datas.removeFirst();
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330 // populate result with discovered elements between de.qiueryRoot and branch's head
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331 for (int i = 1, j = 0; j < de.entries.size(); i = i << 1, j++) {
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332 int idx = de.headIndex + i;
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333 result[idx] = de.entries.get(j);
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334 }
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335 // form next query entries from new unknown elements
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336 if (de.entries.size() > 1) {
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337 /* when entries has only one element, it means de.queryRoot was at head-2 position, and thus
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338 * 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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339 * [1,2] result, and we need one more query to get element 3.
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340 */
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341 for (int i =1, j = 0; j < de.entries.size(); i = i<<1, j++) {
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342 int idx = de.headIndex + i;
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343 Nodeid x = de.entries.get(j);
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344 if (!queried.contains(x) && !scheduled.contains(x) && (rootIndex == -1 || rootIndex - de.headIndex > 1)) {
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345 /*queries for elements right before head is senseless, but unless we know head's index, do it anyway*/
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346 toQuery.add(new DataEntry(x, idx, null));
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347 scheduled.add(x);
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348 }
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349 }
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350 }
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351 } while (!datas.isEmpty());
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352 if (!toQuery.isEmpty()) {
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353 totalQueries++;
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354 }
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355 // for each query, create an between request range, keep record Range->DataEntry to know range's start index
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356 LinkedList<HgRemoteRepository.Range> betweenBatch = new LinkedList<HgRemoteRepository.Range>();
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357 HashMap<HgRemoteRepository.Range, DataEntry> rangeToEntry = new HashMap<HgRemoteRepository.Range, DataEntry>();
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358 for (DataEntry de : toQuery) {
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359 queried.add(de.queryHead);
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360 HgRemoteRepository.Range r = new HgRemoteRepository.Range(branchRoot, de.queryHead);
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361 betweenBatch.add(r);
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362 rangeToEntry.put(r, de);
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363 }
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364 if (!betweenBatch.isEmpty()) {
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365 Map<Range, List<Nodeid>> between = remoteRepo.between(betweenBatch);
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366 for (Entry<Range, List<Nodeid>> e : between.entrySet()) {
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367 DataEntry de = rangeToEntry.get(e.getKey());
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368 assert de != null;
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369 de.entries = e.getValue();
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370 if (rootIndex == -1 && de.entries.size() == 1) {
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371 // returned sequence of length 1 means we used element from [head-2] as root
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372 int numberOfElementsExcludingRootAndHead = de.headIndex + 1;
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373 rootIndex = numberOfElementsExcludingRootAndHead + 1;
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374 System.out.printf("On query %d found out exact number of missing elements: %d\n", totalQueries, numberOfElementsExcludingRootAndHead);
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375 }
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376 datas.add(de); // queue up to record result and construct further requests
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377 }
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378 betweenBatch.clear();
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379 rangeToEntry.clear();
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380 }
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381 toQuery.clear();
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382 }
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383 if (rootIndex == -1) {
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384 throw new HgBadStateException("Shall not happen, provided between output is correct"); // FIXME
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385 }
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386 result[rootIndex] = branchRoot;
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387 boolean resultOk = true;
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388 LinkedList<Nodeid> fromRootToHead = new LinkedList<Nodeid>();
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389 for (int i = 0; i <= rootIndex; i++) {
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390 Nodeid n = result[i];
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391 if (n == null) {
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392 System.out.printf("ERROR: element %d wasn't found\n",i);
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393 resultOk = false;
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394 }
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395 fromRootToHead.addFirst(n); // reverse order
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396 }
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397 System.out.println("Total queries:" + totalQueries);
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398 if (!resultOk) {
cd3371670f0b Refactor incoming and outgoing code to be shared with RepositoryComparator. Placeholders for in/out commands. Refactor common remote lookup code
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
399 throw new HgBadStateException("See console for details"); // FIXME
cd3371670f0b Refactor incoming and outgoing code to be shared with RepositoryComparator. Placeholders for in/out commands. Refactor common remote lookup code
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
400 }
cd3371670f0b Refactor incoming and outgoing code to be shared with RepositoryComparator. Placeholders for in/out commands. Refactor common remote lookup code
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
401 return fromRootToHead;
cd3371670f0b Refactor incoming and outgoing code to be shared with RepositoryComparator. Placeholders for in/out commands. Refactor common remote lookup code
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
402 }
cd3371670f0b Refactor incoming and outgoing code to be shared with RepositoryComparator. Placeholders for in/out commands. Refactor common remote lookup code
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
403 }