annotate cmdline/org/tmatesoft/hg/console/Incoming.java @ 173:4bf061a7c001

Test algorithm to build sequence of missing revisions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 29 Mar 2011 02:20:02 +0200
parents 2c3e96674e2a
children b1de83ffa7f8
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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.console;
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18
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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.Arrays;
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22 import java.util.Collection;
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23 import java.util.Collections;
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24 import java.util.Comparator;
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25 import java.util.HashSet;
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26 import java.util.Iterator;
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27 import java.util.LinkedHashMap;
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28 import java.util.LinkedHashSet;
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29 import java.util.LinkedList;
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30 import java.util.List;
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31 import java.util.Map.Entry;
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33 import junit.framework.Assert;
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35 import org.tmatesoft.hg.core.Nodeid;
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36 import org.tmatesoft.hg.repo.HgChangelog;
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37 import org.tmatesoft.hg.repo.HgRemoteRepository.RemoteBranch;
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38 import org.tmatesoft.hg.repo.HgRepository;
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39
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41 /**
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42 * WORK IN PROGRESS, DO NOT USE
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43 * hg incoming counterpart
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44 *
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45 * @author Artem Tikhomirov
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46 * @author TMate Software Ltd.
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47 */
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48 public class Incoming {
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49
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50 public static void main(String[] args) throws Exception {
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51 if (Boolean.TRUE.booleanValue()) {
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52 new SequenceConstructor().test();
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53 return;
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54 }
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55 Options cmdLineOpts = Options.parse(args);
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56 HgRepository hgRepo = cmdLineOpts.findRepository();
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57 if (hgRepo.isInvalid()) {
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58 System.err.printf("Can't find repository in: %s\n", hgRepo.getLocation());
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59 return;
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60 }
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61 // in fact, all we need from changelog is set of all nodeids. However, since ParentWalker reuses same Nodeids, it's not too expensive
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62 // to reuse it here, XXX although later this may need to be refactored
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63 final HgChangelog.ParentWalker pw = hgRepo.getChangelog().new ParentWalker();
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64 pw.init();
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65 //
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66 HashSet<Nodeid> base = new HashSet<Nodeid>();
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67 HashSet<Nodeid> unknownRemoteHeads = new HashSet<Nodeid>();
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68 // imagine empty repository - any nodeid from remote heads would be unknown
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69 unknownRemoteHeads.add(Nodeid.fromAscii("382cfe9463db0484a14136e4b38407419525f0c0".getBytes(), 0, 40));
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70 //
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71 LinkedList<RemoteBranch> remoteBranches = new LinkedList<RemoteBranch>();
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72 remoteBranches(unknownRemoteHeads, remoteBranches);
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73 //
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74 HashSet<Nodeid> visited = new HashSet<Nodeid>();
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75 HashSet<RemoteBranch> processed = new HashSet<RemoteBranch>();
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76 LinkedList<Nodeid[]> toScan = new LinkedList<Nodeid[]>();
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77 LinkedHashSet<Nodeid> toFetch = new LinkedHashSet<Nodeid>();
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78 // next one seems to track heads we've asked (or plan to ask) remote.branches for
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79 HashSet<Nodeid> unknownHeads /*req*/ = new HashSet<Nodeid>(unknownRemoteHeads);
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80 while (!remoteBranches.isEmpty()) {
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81 LinkedList<Nodeid> toQueryRemote = new LinkedList<Nodeid>();
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82 while (!remoteBranches.isEmpty()) {
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83 RemoteBranch next = remoteBranches.removeFirst();
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84 if (visited.contains(next.head) || processed.contains(next)) {
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85 continue;
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86 }
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87 if (Nodeid.NULL.equals(next.head)) {
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88 // it's discovery.py that expects next.head to be nullid here, I can't imagine how this may happen, hence this exception
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89 throw new IllegalStateException("I wonder if null if may ever get here with remote branches");
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90 } else if (pw.knownNode(next.root)) {
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91 // root of the remote change is known locally, analyze to find exact missing changesets
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92 toScan.addLast(new Nodeid[] { next.head, next.root });
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93 processed.add(next);
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94 } else {
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95 if (!visited.contains(next.root) && !toFetch.contains(next.root)) {
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96 // if parents are locally known, this is new branch (sequence of changes) (sequence sprang out of known parents)
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97 if ((next.p1 == null || pw.knownNode(next.p1)) && (next.p2 == null || pw.knownNode(next.p2))) {
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98 toFetch.add(next.root);
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99 }
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100 // XXX perhaps, may combine this parent processing below (I don't understand what this code is exactly about)
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101 if (pw.knownNode(next.p1)) {
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102 base.add(next.p1);
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103 }
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104 if (pw.knownNode(next.p2)) {
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105 base.add(next.p2);
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106 }
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107 }
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108 if (next.p1 != null && !pw.knownNode(next.p1) && !unknownHeads.contains(next.p1)) {
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109 toQueryRemote.add(next.p1);
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110 unknownHeads.add(next.p1);
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111 }
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112 if (next.p2 != null && !pw.knownNode(next.p2) && !unknownHeads.contains(next.p2)) {
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113 toQueryRemote.add(next.p2);
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114 unknownHeads.add(next.p2);
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115 }
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116 }
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117 visited.add(next.head);
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118 }
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119 if (!toQueryRemote.isEmpty()) {
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120 // discovery.py in fact does this in batches of 10 revisions a time.
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121 // however, this slicing may be done in remoteBranches call instead (if needed)
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122 remoteBranches(toQueryRemote, remoteBranches);
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123 }
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124 }
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125 while (!toScan.isEmpty()) {
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126 Nodeid[] head_root = toScan.removeFirst();
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127 List<Nodeid> nodesBetween = remoteBetween(head_root[0], head_root[1], new LinkedList<Nodeid>());
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128 nodesBetween.add(head_root[1]);
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129 int x = 1;
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130 Nodeid p = head_root[0];
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131 for (Nodeid i : nodesBetween) {
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132 System.out.println("narrowing " + x + ":" + nodesBetween.size() + " " + i.shortNotation());
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133 if (pw.knownNode(i)) {
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134 if (x <= 2) {
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135 toFetch.add(p);
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136 base.add(i);
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137 } else {
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138 // XXX original discovery.py collects new elements to scan separately
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139 // likely to "batch" calls to server
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140 System.out.println("narrowed branch search to " + p.shortNotation() + ":" + i.shortNotation());
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141 toScan.addLast(new Nodeid[] { p, i });
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142 }
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143 break;
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144 }
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145 x = x << 1;
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146 p = i;
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147 }
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148 }
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149 for (Nodeid n : toFetch) {
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150 if (pw.knownNode(n)) {
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151 System.out.println("Erroneous to fetch:" + n);
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152 } else {
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153 System.out.println(n);
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154 }
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155 }
33
565ce0835674 TODO added, to try stream for unzip in revlog
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156
31
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157 }
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158
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159
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160 private static void remoteBranches(Collection<Nodeid> unknownRemoteHeads, List<RemoteBranch> remoteBranches) {
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161 //
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162 // TODO implement this with remote access
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163 //
171
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164 RemoteBranch rb = new RemoteBranch(unknownRemoteHeads.iterator().next(), Nodeid.fromAscii("dbd663faec1f0175619cf7668bddc6350548b8d6"), NULL, NULL);
31
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165 remoteBranches.add(rb);
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166 }
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167
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168 private static List<Nodeid> remoteBetween(Nodeid nodeid1, Nodeid nodeid2, List<Nodeid> list) {
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169 // sent: cmd=between&pairs=d6d2a630f4a6d670c90a5ca909150f2b426ec88f-dbd663faec1f0175619cf7668bddc6350548b8d6
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170 // received: a78c980749e3ccebb47138b547e9b644a22797a9 286d221f6c28cbfce25ea314e1f46a23b7f979d3 fc265ddeab262ff5c34b4cf4e2522d8d41f1f05b a3576694a4d1edaa681cab15b89d6b556b02aff4
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171 // 1st, 2nd, fourth and eights of total 8 changes between rev9 and rev0
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172 //
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173 //
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174 // a78c980749e3ccebb47138b547e9b644a22797a9 286d221f6c28cbfce25ea314e1f46a23b7f979d3 fc265ddeab262ff5c34b4cf4e2522d8d41f1f05b a3576694a4d1edaa681cab15b89d6b556b02aff4
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175 //d6d2a630f4a6d670c90a5ca909150f2b426ec88f a78c980749e3ccebb47138b547e9b644a22797a9 5abe5af181bd6a6d3e94c378376c901f0f80da50 08db726a0fb7914ac9d27ba26dc8bbf6385a0554
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176
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177 // TODO implement with remote access
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178 String response = null;
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179 if (nodeid1.equals(Nodeid.fromAscii("382cfe9463db0484a14136e4b38407419525f0c0".getBytes(), 0, 40)) && nodeid2.equals(Nodeid.fromAscii("dbd663faec1f0175619cf7668bddc6350548b8d6".getBytes(), 0, 40))) {
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180 response = "d6d2a630f4a6d670c90a5ca909150f2b426ec88f a78c980749e3ccebb47138b547e9b644a22797a9 5abe5af181bd6a6d3e94c378376c901f0f80da50 08db726a0fb7914ac9d27ba26dc8bbf6385a0554";
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181 } else if (nodeid1.equals(Nodeid.fromAscii("a78c980749e3ccebb47138b547e9b644a22797a9".getBytes(), 0, 40)) && nodeid2.equals(Nodeid.fromAscii("5abe5af181bd6a6d3e94c378376c901f0f80da50".getBytes(), 0, 40))) {
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182 response = "286d221f6c28cbfce25ea314e1f46a23b7f979d3";
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183 }
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184 if (response == null) {
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185 throw HgRepository.notImplemented();
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186 }
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187 for (String s : response.split(" ")) {
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188 list.add(Nodeid.fromAscii(s.getBytes(), 0, 40));
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189 }
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190 return list;
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191 }
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192
173
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193 private static class SequenceConstructor {
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194
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195 private int[] between(int root, int head) {
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196 if (head <= (root+1)) {
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197 return new int[0];
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198 }
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199 System.out.printf("[%d, %d]\t\t", root, head);
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200 int size = 1 + (int) Math.floor(Math.log(head-root - 1) / Math.log(2));
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201 int[] rv = new int[size];
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202 for (int v = 1, i = 0; i < rv.length; i++) {
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203 rv[i] = root + v;
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204 v = v << 1;
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205 }
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206 System.out.println(Arrays.toString(rv));
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207 return rv;
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208 }
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209
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210 public void test() {
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211 int root = 0, head = 1000;
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212 int[] data = between(root, head); // max number of elements to recover is 2**(1+data.length)-1, need room for
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213 // as much elements, hence 2**(data.length+1). In worst case, when there are onlu 2**data.length + 1 missing element,
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214 // almost half of the finalSequence would be empty
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215 int[] finalSequence = new int[1 << (data.length+1) >>> 5]; // div 32 - total bits to integers
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216 int exactNumberOfElements = -1; // exact number of meaningful bits in finalSequence
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217 LinkedHashMap<Integer, int[]> datas = new LinkedHashMap<Integer, int[]>();
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218 datas.put(root, data);
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219 int totalQueries = 1;
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220 HashSet<Integer> queried = new HashSet<Integer>();
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221 int[] checkSequence = null;
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222 while(!datas.isEmpty()) {
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223 LinkedList<int[]> toQuery = new LinkedList<int[]>();
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224 do {
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225 Iterator<Entry<Integer, int[]>> it = datas.entrySet().iterator();
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226 Entry<Integer, int[]> next = it.next();
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227 int r = next.getKey();
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228 data = next.getValue();
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229 it.remove();
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230 populate(r, head, data, finalSequence);
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231 if (checkSequence != null) {
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232 boolean match = true;
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233 // System.out.println("Try to match:");
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234 for (int i = 0; i < checkSequence.length; i++) {
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235 // System.out.println(i);
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236 // System.out.println("control:" + toBinaryString(checkSequence[i], ' '));
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237 // System.out.println("present:" + toBinaryString(finalSequence[i], ' '));
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diff changeset
238 if (checkSequence[i] != finalSequence[i]) {
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diff changeset
239 match = false;
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240 } else {
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241 match &= true;
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242 }
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243 }
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244 System.out.println(match ? "Match, on query:" + totalQueries : "Didn't match");
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245 }
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diff changeset
246 if (data.length > 2) {
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247 for (int x : data) {
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248 if (!queried.contains(x) && head - x > 1) { /*queries for neighboring elements is senseless*/
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249 toQuery.add(new int[] {x, head});
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250 }
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251 }
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252 }
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253 } while (!datas.isEmpty()) ;
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254 if (!toQuery.isEmpty()) {
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255 System.out.println();
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256 totalQueries++;
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257 }
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258 Collections.sort(toQuery, new Comparator<int[]>() {
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259
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260 public int compare(int[] o1, int[] o2) {
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261 return o1[0] < o2[0] ? -1 : (o1[0] == o2[0] ? 0 : 1);
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262 }
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263 });
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264 for (int[] x : toQuery) {
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265 if (!queried.contains(x[0])) {
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266 queried.add(x[0]);
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267 data = between(x[0], x[1]);
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268 if (exactNumberOfElements == -1 && data.length == 1) {
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269 exactNumberOfElements = x[0] + 1;
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270 System.out.printf("On query %d found out exact number of missing elements: %d\n", totalQueries, exactNumberOfElements);
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271 // get a bit sequence of exactNumberOfElements, 0111..110
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272 // to 'and' it with finalSequence later
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273 int totalInts = (exactNumberOfElements + 2 /*heading and tailing zero bits*/) >>> 5;
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274 int trailingBits = (exactNumberOfElements + 2) & 0x1f;
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275 if (trailingBits != 0) {
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276 totalInts++;
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277 }
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278 checkSequence = new int[totalInts];
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279 Arrays.fill(checkSequence, 0xffffffff);
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280 checkSequence[0] &= 0x7FFFFFFF;
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281 if (trailingBits == 0) {
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282 checkSequence[totalInts-1] &= 0xFFFFFFFE;
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283 } else if (trailingBits == 1) {
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284 checkSequence[totalInts-1] = 0;
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285 } else {
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286 // trailingBits include heading and trailing zero bits
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287 int mask = 0x80000000 >> trailingBits-2; // with sign!
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288 checkSequence[totalInts - 1] &= mask;
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289 }
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290 for (int e : checkSequence) {
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291 System.out.print(toBinaryString(e, ' '));
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292 }
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293 System.out.println();
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294 }
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295 datas.put(x[0], data);
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296 }
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297 }
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298 }
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299
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300 System.out.println("Total queries:" + totalQueries);
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301 for (int x : finalSequence) {
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302 System.out.print(toBinaryString(x, ' '));
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303 }
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304 }
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305
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306 private void populate(int root, int head, int[] data, int[] finalSequence) {
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307 for (int i = 1, x = 0; root+i < head; i = i << 1, x++) {
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308 int value = data[x];
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309 int value_check = root+i;
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310 Assert.assertEquals(value, value_check);
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311 int wordIx = (root + i) >>> 5;
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312 int bitIx = (root + i) & 0x1f;
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313 finalSequence[wordIx] |= 1 << (31-bitIx);
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314 }
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315 }
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316
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317 private static String toBinaryString(int x, char byteSeparator) {
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318 StringBuilder sb = new StringBuilder(4*8+4);
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319 sb.append(toBinaryString((byte) (x >>> 24)));
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320 sb.append(byteSeparator);
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321 sb.append(toBinaryString((byte) ((x & 0x00ff0000) >>> 16)));
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322 sb.append(byteSeparator);
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323 sb.append(toBinaryString((byte) ((x & 0x00ff00) >>> 8)));
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324 sb.append(byteSeparator);
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325 sb.append(toBinaryString((byte) (x & 0x00ff)));
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326 sb.append(byteSeparator);
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327 return sb.toString();
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328 }
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329
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330 private static String toBinaryString(byte b) {
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331 final String nibbles = "0000000100100011010001010110011110001001101010111100110111101111";
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332 assert nibbles.length() == 16*4;
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333 int x1 = (b >>> 4) & 0x0f, x2 = b & 0x0f;
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334 x1 *= 4; x2 *= 4; // 4 characters per nibble
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335 return nibbles.substring(x1, x1+4).concat(nibbles.substring(x2, x2+4));
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336 }
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337 }
31
346b66add79d Basic lookup for incoming changes
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338 }