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annotate src/org/tmatesoft/hg/internal/RepositoryComparator.java @ 200:114c9fe7b643

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Performance optimization: reduce memory ParentWalker hogs
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 20 Apr 2011 21:14:51 +0200
parents e5407b5a586a
children 706bcc7cfee4
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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20
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21 import java.util.ArrayList;
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22 import java.util.Collections;
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23 import java.util.HashMap;
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24 import java.util.HashSet;
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25 import java.util.LinkedList;
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26 import java.util.List;
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27 import java.util.ListIterator;
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28 import java.util.Map;
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29 import java.util.Map.Entry;
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31 import org.tmatesoft.hg.core.HgBadStateException;
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32 import org.tmatesoft.hg.core.HgException;
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33 import org.tmatesoft.hg.core.Nodeid;
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34 import org.tmatesoft.hg.repo.HgChangelog;
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35 import org.tmatesoft.hg.repo.HgRemoteRepository;
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36 import org.tmatesoft.hg.repo.HgRemoteRepository.Range;
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37 import org.tmatesoft.hg.repo.HgRemoteRepository.RemoteBranch;
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38 import org.tmatesoft.hg.util.CancelSupport;
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39 import org.tmatesoft.hg.util.CancelledException;
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40 import org.tmatesoft.hg.util.ProgressSupport;
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41
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42 /**
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43 *
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44 * @author Artem Tikhomirov
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45 * @author TMate Software Ltd.
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46 */
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47 public class RepositoryComparator {
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48
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49 private final HgChangelog.ParentWalker localRepo;
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50 private final HgRemoteRepository remoteRepo;
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51 private List<Nodeid> common;
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52
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53 public RepositoryComparator(HgChangelog.ParentWalker pwLocal, HgRemoteRepository hgRemote) {
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54 localRepo = pwLocal;
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55 remoteRepo = hgRemote;
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56 }
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57
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58 public RepositoryComparator compare(Object context) throws HgException, CancelledException {
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59 ProgressSupport progressSupport = ProgressSupport.Factory.get(context);
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60 CancelSupport cancelSupport = CancelSupport.Factory.get(context);
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61 cancelSupport.checkCancelled();
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62 progressSupport.start(10);
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63 common = Collections.unmodifiableList(findCommonWithRemote());
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64 // sanity check
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65 for (Nodeid n : common) {
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66 if (!localRepo.knownNode(n)) {
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67 throw new HgBadStateException("Unknown node reported as common:" + n);
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68 }
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69 }
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70 progressSupport.done();
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71 return this;
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72 }
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73
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74 public List<Nodeid> getCommon() {
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75 if (common == null) {
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76 throw new HgBadStateException("Call #compare(Object) first");
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77 }
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78 return common;
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79 }
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80
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81 /**
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82 * @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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83 */
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84 public List<Nodeid> getLocalOnlyRevisions() {
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85 return localRepo.childrenOf(getCommon());
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86 }
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87
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88 /**
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89 * Similar to @link {@link #getLocalOnlyRevisions()}, use this one if you need access to changelog entry content, not
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90 * only its revision number.
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91 * @param inspector delegate to analyze changesets, shall not be <code>null</code>
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92 */
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93 public void visitLocalOnlyRevisions(HgChangelog.Inspector inspector) {
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94 if (inspector == null) {
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95 throw new IllegalArgumentException();
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96 }
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97 // one can use localRepo.childrenOf(getCommon()) and then iterate over nodeids, but there seems to be
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98 // another approach to get all changes after common:
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99 // find index of earliest revision, and report all that were later
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100 final HgChangelog changelog = localRepo.getRepo().getChangelog();
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101 int earliestRevision = Integer.MAX_VALUE;
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102 List<Nodeid> commonKnown = getCommon();
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103 for (Nodeid n : commonKnown) {
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104 if (!localRepo.hasChildren(n)) {
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105 // there might be (old) nodes, known both locally and remotely, with no children
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106 // hence, we don't need to consider their local revision number
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107 continue;
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108 }
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109 int lr = changelog.getLocalRevision(n);
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110 if (lr < earliestRevision) {
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111 earliestRevision = lr;
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112 }
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113 }
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114 if (earliestRevision < 0 || earliestRevision >= changelog.getLastRevision()) {
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115 throw new HgBadStateException(String.format("Invalid index of common known revision: %d in total of %d", earliestRevision, 1+changelog.getLastRevision()));
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116 }
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117 changelog.range(earliestRevision+1, changelog.getLastRevision(), inspector);
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118 }
181
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119
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120 private List<Nodeid> findCommonWithRemote() throws HgException {
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121 List<Nodeid> remoteHeads = remoteRepo.heads();
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122 LinkedList<Nodeid> resultCommon = new LinkedList<Nodeid>(); // these remotes are known in local
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123 LinkedList<Nodeid> toQuery = new LinkedList<Nodeid>(); // these need further queries to find common
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124 for (Nodeid rh : remoteHeads) {
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125 if (localRepo.knownNode(rh)) {
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126 resultCommon.add(rh);
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127 } else {
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128 toQuery.add(rh);
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129 }
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130 }
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131 if (toQuery.isEmpty()) {
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132 return resultCommon;
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133 }
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134 LinkedList<RemoteBranch> checkUp2Head = new LinkedList<RemoteBranch>(); // branch.root and branch.head are of interest only.
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135 // these are branches with unknown head but known root, which might not be the last common known,
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136 // i.e. there might be children changeset that are also available at remote, [..?..common-head..remote-head] - need to
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137 // scroll up to common head.
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138 while (!toQuery.isEmpty()) {
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139 List<RemoteBranch> remoteBranches = remoteRepo.branches(toQuery); //head, root, first parent, second parent
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140 toQuery.clear();
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141 while(!remoteBranches.isEmpty()) {
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142 RemoteBranch rb = remoteBranches.remove(0);
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143 // I assume branches remote call gives branches with head equal to what I pass there, i.e.
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144 // that I don't need to check whether rb.head is unknown.
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145 if (localRepo.knownNode(rb.root)) {
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146 // we known branch start, common head is somewhere in its descendants line
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147 checkUp2Head.add(rb);
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148 } else {
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149 // dig deeper in the history, if necessary
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150 if (!NULL.equals(rb.p1) && !localRepo.knownNode(rb.p1)) {
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151 toQuery.add(rb.p1);
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152 }
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153 if (!NULL.equals(rb.p2) && !localRepo.knownNode(rb.p2)) {
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154 toQuery.add(rb.p2);
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155 }
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156 }
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157 }
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158 }
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159 // can't check nodes between checkUp2Head element and local heads, remote might have distinct descendants sequence
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160 for (RemoteBranch rb : checkUp2Head) {
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161 // rb.root is known locally
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162 List<Nodeid> remoteRevisions = remoteRepo.between(rb.head, rb.root);
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163 if (remoteRevisions.isEmpty()) {
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164 // head is immediate child
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165 resultCommon.add(rb.root);
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166 } else {
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167 // between gives result from head to root, I'd like to go in reverse direction
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168 Collections.reverse(remoteRevisions);
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169 Nodeid root = rb.root;
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170 while(!remoteRevisions.isEmpty()) {
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171 Nodeid n = remoteRevisions.remove(0);
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172 if (localRepo.knownNode(n)) {
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173 if (remoteRevisions.isEmpty()) {
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174 // this is the last known node before an unknown
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175 resultCommon.add(n);
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176 break;
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177 }
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178 if (remoteRevisions.size() == 1) {
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179 // there's only one left between known n and unknown head
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180 // this check is to save extra between query, not really essential
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181 Nodeid last = remoteRevisions.remove(0);
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182 resultCommon.add(localRepo.knownNode(last) ? last : n);
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183 break;
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184 }
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185 // might get handy for next between query, to narrow search down
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186 root = n;
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187 } else {
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188 remoteRevisions = remoteRepo.between(n, root);
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189 Collections.reverse(remoteRevisions);
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190 if (remoteRevisions.isEmpty()) {
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191 resultCommon.add(root);
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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 }
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197 // TODO ensure unique elements in the list
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198 return resultCommon;
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199 }
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200
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201 // somewhat similar to Outgoing.findCommonWithRemote()
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202 public List<BranchChain> calculateMissingBranches() throws HgException {
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203 List<Nodeid> remoteHeads = remoteRepo.heads();
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204 LinkedList<Nodeid> common = new LinkedList<Nodeid>(); // these remotes are known in local
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205 LinkedList<Nodeid> toQuery = new LinkedList<Nodeid>(); // these need further queries to find common
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206 for (Nodeid rh : remoteHeads) {
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207 if (localRepo.knownNode(rh)) {
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208 common.add(rh);
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209 } else {
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210 toQuery.add(rh);
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211 }
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212 }
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213 if (toQuery.isEmpty()) {
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214 return Collections.emptyList(); // no incoming changes
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215 }
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216 LinkedList<BranchChain> branches2load = new LinkedList<BranchChain>(); // return value
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217 // detailed comments are in Outgoing.findCommonWithRemote
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218 LinkedList<RemoteBranch> checkUp2Head = new LinkedList<RemoteBranch>();
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219 // records relation between branch head and its parent branch, if any
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220 HashMap<Nodeid, BranchChain> head2chain = new HashMap<Nodeid, BranchChain>();
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221 while (!toQuery.isEmpty()) {
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222 List<RemoteBranch> remoteBranches = remoteRepo.branches(toQuery); //head, root, first parent, second parent
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223 toQuery.clear();
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224 while(!remoteBranches.isEmpty()) {
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225 RemoteBranch rb = remoteBranches.remove(0);
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226 BranchChain chainElement = head2chain.get(rb.head);
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227 if (chainElement == null) {
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228 chainElement = new BranchChain(rb.head);
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229 // record this unknown branch to download later
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230 branches2load.add(chainElement);
184
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231 // the only chance we'll need chainElement in the head2chain is when we know this branch's root
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232 head2chain.put(rb.head, chainElement);
181
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233 }
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234 if (localRepo.knownNode(rb.root)) {
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235 // we known branch start, common head is somewhere in its descendants line
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236 checkUp2Head.add(rb);
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237 } else {
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238 chainElement.branchRoot = rb.root;
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239 // dig deeper in the history, if necessary
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240 if (!NULL.equals(rb.p1) && !localRepo.knownNode(rb.p1)) {
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241 toQuery.add(rb.p1);
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242 head2chain.put(rb.p1, chainElement.p1 = new BranchChain(rb.p1));
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243 }
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244 if (!NULL.equals(rb.p2) && !localRepo.knownNode(rb.p2)) {
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245 toQuery.add(rb.p2);
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246 head2chain.put(rb.p2, chainElement.p2 = new BranchChain(rb.p2));
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247 }
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248 }
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249 }
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250 }
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251 for (RemoteBranch rb : checkUp2Head) {
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252 Nodeid h = rb.head;
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253 Nodeid r = rb.root;
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254 int watchdog = 1000;
184
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255 assert head2chain.containsKey(h);
181
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256 BranchChain bc = head2chain.get(h);
184
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257 assert bc != null : h.toString();
181
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258 // if we know branch root locally, there could be no parent branch chain elements.
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259 assert bc.p1 == null;
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260 assert bc.p2 == null;
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261 do {
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262 List<Nodeid> between = remoteRepo.between(h, r);
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263 if (between.isEmpty()) {
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264 bc.branchRoot = r;
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265 break;
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266 } else {
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267 Collections.reverse(between);
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268 for (Nodeid n : between) {
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269 if (localRepo.knownNode(n)) {
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270 r = n;
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271 } else {
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272 h = n;
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273 break;
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274 }
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275 }
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276 Nodeid lastInBetween = between.get(between.size() - 1);
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277 if (r.equals(lastInBetween)) {
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278 bc.branchRoot = r;
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279 break;
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280 } else if (h.equals(lastInBetween)) { // the only chance for current head pointer to point to the sequence tail
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281 // is when r is second from the between list end (iow, head,1,[2],4,8...,root)
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282 bc.branchRoot = r;
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283 break;
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284 }
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285 }
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286 } while(--watchdog > 0);
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287 if (watchdog == 0) {
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288 throw new HgBadStateException(String.format("Can't narrow down branch [%s, %s]", rb.head.shortNotation(), rb.root.shortNotation()));
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289 }
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290 }
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291 return branches2load;
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292 }
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293
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294 public static final class BranchChain {
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295 // when we construct a chain, we know head which is missing locally, hence init it right away.
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296 // 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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297 public final Nodeid branchHead;
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298 public Nodeid branchRoot;
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299 // either of these can be null, or both.
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300 // although RemoteBranch has either both parents null, or both non-null, when we construct a chain
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301 // 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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302 public BranchChain p1;
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303 public BranchChain p2;
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304
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305 public BranchChain(Nodeid head) {
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306 assert head != null;
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307 branchHead = head;
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308 }
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309 public boolean isTerminal() {
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310 return p1 == null || p2 == null;
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311 }
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312
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313 @Override
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314 public String toString() {
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315 return String.format("BranchChain [%s, %s]", branchRoot, branchHead);
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316 }
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317
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318 public void dump() {
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319 System.out.println(toString());
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320 internalDump(" ");
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321 }
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322
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323 private void internalDump(String prefix) {
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324 if (p1 != null) {
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325 System.out.println(prefix + p1.toString());
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326 }
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327 if (p2 != null) {
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328 System.out.println(prefix + p2.toString());
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329 }
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330 prefix += " ";
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331 if (p1 != null) {
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332 p1.internalDump(prefix);
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333 }
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334 if (p2 != null) {
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335 p2.internalDump(prefix);
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336 }
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337 }
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338 }
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339
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340 /**
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341 * @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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342 */
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343 public List<Nodeid> completeBranch(final Nodeid branchRoot, final Nodeid branchHead) throws HgException {
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344 class DataEntry {
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345 public final Nodeid queryHead;
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346 public final int headIndex;
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347 public List<Nodeid> entries;
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348
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349 public DataEntry(Nodeid head, int index, List<Nodeid> data) {
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350 queryHead = head;
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351 headIndex = index;
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352 entries = data;
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353 }
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354 };
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355
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356 List<Nodeid> initial = remoteRepo.between(branchHead, branchRoot);
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357 Nodeid[] result = new Nodeid[1 + (1 << initial.size())];
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358 result[0] = branchHead;
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359 int rootIndex = -1; // index in the result, where to place branche's root.
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360 if (initial.isEmpty()) {
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361 rootIndex = 1;
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362 } else if (initial.size() == 1) {
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363 rootIndex = 2;
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364 }
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365 LinkedList<DataEntry> datas = new LinkedList<DataEntry>();
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366 // DataEntry in datas has entries list filled with 'between' data, whereas
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367 // DataEntry in toQuery keeps only nodeid and its index, with entries to be initialized before
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368 // moving to datas.
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369 LinkedList<DataEntry> toQuery = new LinkedList<DataEntry>();
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370 //
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371 datas.add(new DataEntry(branchHead, 0, initial));
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372 int totalQueries = 1;
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373 HashSet<Nodeid> queried = new HashSet<Nodeid>();
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374 while(!datas.isEmpty()) {
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375 // keep record of those planned to be queried next time we call between()
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376 // although may keep these in queried, if really don't want separate collection
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377 HashSet<Nodeid> scheduled = new HashSet<Nodeid>();
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378 do {
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379 DataEntry de = datas.removeFirst();
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380 // populate result with discovered elements between de.qiueryRoot and branch's head
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381 for (int i = 1, j = 0; j < de.entries.size(); i = i << 1, j++) {
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382 int idx = de.headIndex + i;
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383 result[idx] = de.entries.get(j);
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384 }
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385 // form next query entries from new unknown elements
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386 if (de.entries.size() > 1) {
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387 /* when entries has only one element, it means de.queryRoot was at head-2 position, and thus
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388 * 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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389 * [1,2] result, and we need one more query to get element 3.
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390 */
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391 for (int i =1, j = 0; j < de.entries.size(); i = i<<1, j++) {
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392 int idx = de.headIndex + i;
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393 Nodeid x = de.entries.get(j);
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394 if (!queried.contains(x) && !scheduled.contains(x) && (rootIndex == -1 || rootIndex - de.headIndex > 1)) {
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395 /*queries for elements right before head is senseless, but unless we know head's index, do it anyway*/
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396 toQuery.add(new DataEntry(x, idx, null));
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397 scheduled.add(x);
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398 }
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399 }
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400 }
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401 } while (!datas.isEmpty());
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402 if (!toQuery.isEmpty()) {
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403 totalQueries++;
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404 }
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405 // for each query, create an between request range, keep record Range->DataEntry to know range's start index
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406 LinkedList<HgRemoteRepository.Range> betweenBatch = new LinkedList<HgRemoteRepository.Range>();
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407 HashMap<HgRemoteRepository.Range, DataEntry> rangeToEntry = new HashMap<HgRemoteRepository.Range, DataEntry>();
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408 for (DataEntry de : toQuery) {
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409 queried.add(de.queryHead);
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410 HgRemoteRepository.Range r = new HgRemoteRepository.Range(branchRoot, de.queryHead);
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411 betweenBatch.add(r);
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412 rangeToEntry.put(r, de);
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413 }
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414 if (!betweenBatch.isEmpty()) {
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415 Map<Range, List<Nodeid>> between = remoteRepo.between(betweenBatch);
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416 for (Entry<Range, List<Nodeid>> e : between.entrySet()) {
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417 DataEntry de = rangeToEntry.get(e.getKey());
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418 assert de != null;
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419 de.entries = e.getValue();
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420 if (rootIndex == -1 && de.entries.size() == 1) {
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421 // returned sequence of length 1 means we used element from [head-2] as root
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422 int numberOfElementsExcludingRootAndHead = de.headIndex + 1;
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423 rootIndex = numberOfElementsExcludingRootAndHead + 1;
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424 System.out.printf("On query %d found out exact number of missing elements: %d\n", totalQueries, numberOfElementsExcludingRootAndHead);
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425 }
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426 datas.add(de); // queue up to record result and construct further requests
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427 }
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428 betweenBatch.clear();
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429 rangeToEntry.clear();
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430 }
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431 toQuery.clear();
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432 }
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433 if (rootIndex == -1) {
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434 throw new HgBadStateException("Shall not happen, provided between output is correct"); // FIXME
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435 }
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436 result[rootIndex] = branchRoot;
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437 boolean resultOk = true;
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438 LinkedList<Nodeid> fromRootToHead = new LinkedList<Nodeid>();
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439 for (int i = 0; i <= rootIndex; i++) {
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440 Nodeid n = result[i];
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441 if (n == null) {
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442 System.out.printf("ERROR: element %d wasn't found\n",i);
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443 resultOk = false;
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444 }
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445 fromRootToHead.addFirst(n); // reverse order
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446 }
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447 System.out.println("Total queries:" + totalQueries);
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448 if (!resultOk) {
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449 throw new HgBadStateException("See console for details"); // FIXME
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450 }
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451 return fromRootToHead;
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452 }
192
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453
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454 /**
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455 * returns in order from branch root to head
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456 * for a non-empty BranchChain, shall return modifiable list
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457 */
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458 public List<Nodeid> visitBranches(BranchChain bc) throws HgException {
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459 if (bc == null) {
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460 return Collections.emptyList();
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461 }
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462 List<Nodeid> mine = completeBranch(bc.branchRoot, bc.branchHead);
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463 if (bc.isTerminal()) {
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464 return mine;
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465 }
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466 List<Nodeid> parentBranch1 = visitBranches(bc.p1);
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467 List<Nodeid> parentBranch2 = visitBranches(bc.p2);
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468 // merge
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469 LinkedList<Nodeid> merged = new LinkedList<Nodeid>();
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470 ListIterator<Nodeid> i1 = parentBranch1.listIterator(), i2 = parentBranch2.listIterator();
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471 while (i1.hasNext() && i2.hasNext()) {
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472 Nodeid n1 = i1.next();
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473 Nodeid n2 = i2.next();
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474 if (n1.equals(n2)) {
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475 merged.addLast(n1);
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476 } else {
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477 // first different => add both, and continue adding both tails sequentially
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478 merged.add(n2);
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479 merged.add(n1);
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480 break;
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481 }
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482 }
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483 // copy rest of second parent branch
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484 while (i2.hasNext()) {
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485 merged.add(i2.next());
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486 }
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487 // copy rest of first parent branch
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488 while (i1.hasNext()) {
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489 merged.add(i1.next());
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490 }
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491 //
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492 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(mine.size() + merged.size());
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493 rv.addAll(merged);
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494 rv.addAll(mine);
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495 return rv;
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496 }
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497
181
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498 }