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annotate cmdline/org/tmatesoft/hg/console/Outgoing.java @ 171:2c3e96674e2a

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Towards outgoing changes - initial detection logic, get connected with remote repo stub
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 25 Mar 2011 00:05:52 +0100
parents a3a2e5deb320
children 87f40938c9b2
rev   line source
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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.net.URL;
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22 import java.util.Collection;
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23 import java.util.LinkedList;
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24 import java.util.List;
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25
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26 import org.tmatesoft.hg.core.HgException;
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.repo.HgChangelog;
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29 import org.tmatesoft.hg.repo.HgLookup;
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30 import org.tmatesoft.hg.repo.HgRemoteRepository;
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31 import org.tmatesoft.hg.repo.HgRemoteRepository.RemoteBranch;
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32 import org.tmatesoft.hg.repo.HgRepository;
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33
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34
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35 /**
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36 * WORK IN PROGRESS, DO NOT USE
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37 * hg outgoing
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38 *
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 public class Outgoing {
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43
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44 public static void main(String[] args) throws Exception {
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45 Options cmdLineOpts = Options.parse(args);
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46 HgRepository hgRepo = cmdLineOpts.findRepository();
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47 if (hgRepo.isInvalid()) {
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48 System.err.printf("Can't find repository in: %s\n", hgRepo.getLocation());
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49 return;
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50 }
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51 HgRemoteRepository hgRemote = new HgLookup().detect(new URL("hg4j-gc"));
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52
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53 HgChangelog.ParentWalker pw = hgRepo.getChangelog().new ParentWalker();
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54 pw.init();
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56 List<Nodeid> commonKnown = findCommonWithRemote(pw, hgRemote);
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57 dump("Nodes known to be both locally and at remote server", commonKnown);
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58 // sanity check
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59 for (Nodeid n : commonKnown) {
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60 if (!pw.knownNode(n)) {
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61 throw new HgException("Unknown node reported as common:" + n);
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62 }
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63 }
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64 // find all local children of commonKnown
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65 List<Nodeid> result = pw.childrenOf(commonKnown);
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66 dump("Result", result);
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67 }
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68
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69 private static List<Nodeid> findCommonWithRemote(HgChangelog.ParentWalker pwLocal, HgRemoteRepository hgRemote) {
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70 List<Nodeid> remoteHeads = hgRemote.heads();
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71 LinkedList<Nodeid> common = new LinkedList<Nodeid>(); // these remotes are known in local
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72 LinkedList<Nodeid> toQuery = new LinkedList<Nodeid>(); // these need further queries to find common
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73 for (Nodeid rh : remoteHeads) {
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74 if (pwLocal.knownNode(rh)) {
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75 common.add(rh);
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76 } else {
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77 toQuery.add(rh);
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78 }
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79 }
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80 if (toQuery.isEmpty()) {
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81 return common;
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82 }
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83 LinkedList<RemoteBranch> checkUp2Head = new LinkedList<RemoteBranch>(); // branch.root and branch.head are of interest only.
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84 // these are branches with unknown head but known root, which might not be the last common known,
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85 // i.e. there might be children changeset that are also available at remote, [..?..common-head..remote-head] - need to
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86 // scroll up to common head.
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87 while (!toQuery.isEmpty()) {
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88 List<RemoteBranch> remoteBranches = hgRemote.branches(toQuery); //head, root, first parent, second parent
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89 toQuery.clear();
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90 while(!remoteBranches.isEmpty()) {
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91 RemoteBranch rb = remoteBranches.remove(0);
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92 // I assume branches remote call gives branches with head equal to what I pass there, i.e.
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93 // that I don't need to check whether rb.head is unknown.
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94 if (pwLocal.knownNode(rb.root)) {
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95 // we known branch start, common head is somewhere in its descendants line
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96 checkUp2Head.add(rb);
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97 } else {
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98 // dig deeper in the history, if necessary
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99 if (!NULL.equals(rb.p1) && !pwLocal.knownNode(rb.p1)) {
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100 toQuery.add(rb.p1);
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101 }
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102 if (!NULL.equals(rb.p2) && !pwLocal.knownNode(rb.p2)) {
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103 toQuery.add(rb.p2);
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104 }
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105 }
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106 }
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107 }
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108 // can't check nodes between checkUp2Head element and local heads, remote might have distinct descendants sequence
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109 for (RemoteBranch rb : checkUp2Head) {
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110 // rb.root is known locally
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111 List<Nodeid> remoteRevisions = hgRemote.between(rb.root, rb.head);
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112 if (remoteRevisions.isEmpty()) {
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113 // head is immediate child
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114 common.add(rb.root);
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115 } else {
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116 Nodeid root = rb.root;
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117 while(!remoteRevisions.isEmpty()) {
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118 Nodeid n = remoteRevisions.remove(0);
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119 if (pwLocal.knownNode(n)) {
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120 if (remoteRevisions.isEmpty()) {
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121 // this is the last known node before an unknown
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122 common.add(n);
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123 break;
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124 }
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125 if (remoteRevisions.size() == 1) {
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126 // there's only one left between known n and unknown head
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127 // this check is to save extra between query, not really essential
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128 Nodeid last = remoteRevisions.remove(0);
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129 common.add(pwLocal.knownNode(last) ? last : n);
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130 break;
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131 }
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132 // might get handy for next between query, to narrow search down
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133 root = n;
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134 } else {
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135 remoteRevisions = hgRemote.between(root, n);
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136 if (remoteRevisions.isEmpty()) {
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diff changeset
137 common.add(root);
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138 }
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139 }
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140 }
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141 }
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142 }
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143 // TODO ensure unique elements in the list
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diff changeset
144 return common;
30
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145 }
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146
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147 private static void dump(String s, Collection<Nodeid> c) {
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148 System.out.println(s);
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149 for (Nodeid n : c) {
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150 System.out.println(n);
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151 }
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152 }
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153 }