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annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 673:545b1d4cc11d

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Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 12 Jul 2013 20:14:24 +0200
parents fba85bc1dfb8
children
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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18
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19 import java.io.File;
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20 import java.io.IOException;
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21 import java.io.InputStream;
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22 import java.util.ConcurrentModificationException;
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23
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24 import org.tmatesoft.hg.core.HgIOException;
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25 import org.tmatesoft.hg.core.Nodeid;
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26 import org.tmatesoft.hg.core.SessionContext;
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27 import org.tmatesoft.hg.internal.ByteArrayChannel;
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28 import org.tmatesoft.hg.internal.ByteArrayDataAccess;
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29 import org.tmatesoft.hg.internal.Callback;
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30 import org.tmatesoft.hg.internal.ChangesetParser;
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31 import org.tmatesoft.hg.internal.DataAccess;
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32 import org.tmatesoft.hg.internal.DataAccessInputStream;
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33 import org.tmatesoft.hg.internal.DataAccessProvider;
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34 import org.tmatesoft.hg.internal.DigestHelper;
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35 import org.tmatesoft.hg.internal.EncodingHelper;
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36 import org.tmatesoft.hg.internal.Experimental;
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37 import org.tmatesoft.hg.internal.InflaterDataAccess;
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38 import org.tmatesoft.hg.internal.Internals;
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39 import org.tmatesoft.hg.internal.Lifecycle;
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40 import org.tmatesoft.hg.internal.Patch;
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41 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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42 import org.tmatesoft.hg.util.Adaptable;
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43 import org.tmatesoft.hg.util.CancelledException;
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44
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45 /**
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46 * WORK IN PROGRESS
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47 *
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48 * @see http://mercurial.selenic.com/wiki/BundleFormat
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49 *
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50 * @author Artem Tikhomirov
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51 * @author TMate Software Ltd.
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52 */
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53 @Experimental(reason="API is not stable")
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54 public class HgBundle {
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55
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56 final File bundleFile;
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57 private final DataAccessProvider accessProvider;
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58 final SessionContext ctx;
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59 private final EncodingHelper fnDecorer;
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60 private Lifecycle.BasicCallback flowControl;
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62 HgBundle(SessionContext sessionContext, DataAccessProvider dap, File bundle) {
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63 ctx = sessionContext;
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64 accessProvider = dap;
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65 bundleFile = bundle;
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66 fnDecorer = Internals.buildFileNameEncodingHelper(new SessionContext.SourcePrim(ctx));
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67 }
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68
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69 private DataAccess getDataStream() throws IOException {
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70 DataAccess da = accessProvider.createReader(bundleFile, false);
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71 byte[] signature = new byte[6];
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72 if (da.length() > 6) {
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73 da.readBytes(signature, 0, 6);
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74 if (signature[0] == 'H' && signature[1] == 'G' && signature[2] == '1' && signature[3] == '0') {
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75 if (signature[4] == 'G' && signature[5] == 'Z') {
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76 return new InflaterDataAccess(da, 6, da.length() - 6);
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77 }
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78 if (signature[4] == 'B' && signature[5] == 'Z') {
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79 throw Internals.notImplemented();
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80 }
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81 if (signature[4] != 'U' || signature[5] != 'N') {
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82 throw new HgInvalidStateException(String.format("Bad bundle signature: %s", String.valueOf(signature)));
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83 }
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84 // "...UN", fall-through
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85 } else {
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86 da.reset();
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87 }
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88 }
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89 return da;
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90 }
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91
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92 private int uses = 0;
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93 public HgBundle link() {
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94 uses++;
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95 return this;
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96 }
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97 public void unlink() {
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98 uses--;
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99 if (uses == 0 && bundleFile != null) {
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100 bundleFile.deleteOnExit();
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101 }
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102 }
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103 public boolean inUse() {
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104 return uses > 0;
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105 }
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106
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107 /**
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108 * Get changes recorded in the bundle that are missing from the supplied repository.
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109 * @param hgRepo repository that shall possess base revision for this bundle
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110 * @param inspector callback to get each changeset found
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111 */
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112 public void changes(final HgRepository hgRepo, final HgChangelog.Inspector inspector) throws HgIOException, HgRuntimeException {
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113 Inspector bundleInsp = new Inspector() {
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114 DigestHelper dh = new DigestHelper();
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115 boolean emptyChangelog = true;
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116 private DataAccess prevRevContent;
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117 private int revisionIndex;
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118 private ChangesetParser csetBuilder;
169
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119
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120 public void changelogStart() {
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121 emptyChangelog = true;
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122 revisionIndex = 0;
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123 csetBuilder = new ChangesetParser(hgRepo, new HgChangelog.RawCsetFactory(true));
169
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124 }
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125
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126 public void changelogEnd() {
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127 if (emptyChangelog) {
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128 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
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129 }
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130 }
169
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131
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132 /*
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133 * Despite that BundleFormat wiki says: "Each Changelog entry patches the result of all previous patches
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134 * (the previous, or parent patch of a given patch p is the patch that has a node equal to p's p1 field)",
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135 * it seems not to hold true. Instead, each entry patches previous one, regardless of whether the one
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136 * before is its parent (i.e. ge.firstParent()) or not.
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137 *
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138 Actual state in the changelog.i
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139 Index Offset Flags Packed Actual Base Rev Link Rev Parent1 Parent2 nodeid
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140 50: 9212 0 209 329 48 50 49 -1 f1db8610da62a3e0beb8d360556ee1fd6eb9885e
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141 51: 9421 0 278 688 48 51 50 -1 9429c7bd1920fab164a9d2b621d38d57bcb49ae0
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142 52: 9699 0 154 179 52 52 50 -1 30bd389788464287cee22ccff54c330a4b715de5
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143 53: 9853 0 133 204 52 53 51 52 a6f39e595b2b54f56304470269a936ead77f5725
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144 54: 9986 0 156 182 54 54 52 -1 fd4f2c98995beb051070630c272a9be87bef617d
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145
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146 Excerpt from bundle (nodeid, p1, p2, cs):
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147 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 26e3eeaa39623de552b45ee1f55c14f36460f220 0000000000000000000000000000000000000000 f1db8610da62a3e0beb8d360556ee1fd6eb9885e; patches:4
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148 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 9429c7bd1920fab164a9d2b621d38d57bcb49ae0; patches:3
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149 > 30bd389788464287cee22ccff54c330a4b715de5 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 30bd389788464287cee22ccff54c330a4b715de5; patches:3
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150 a6f39e595b2b54f56304470269a936ead77f5725 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 30bd389788464287cee22ccff54c330a4b715de5 a6f39e595b2b54f56304470269a936ead77f5725; patches:3
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151 fd4f2c98995beb051070630c272a9be87bef617d 30bd389788464287cee22ccff54c330a4b715de5 0000000000000000000000000000000000000000 fd4f2c98995beb051070630c272a9be87bef617d; patches:3
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152
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153 To recreate 30bd..e5, one have to take content of 9429..e0, not its p1 f1db..5e
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154 */
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155 public boolean element(GroupElement ge) throws IOException, HgRuntimeException {
169
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156 emptyChangelog = false;
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157 HgChangelog changelog = hgRepo.getChangelog();
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158 try {
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159 if (prevRevContent == null) {
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160 if (ge.firstParent().isNull() && ge.secondParent().isNull()) {
169
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161 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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162 } else {
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163 final Nodeid base = ge.firstParent();
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164 if (!changelog.isKnown(base) /*only first parent, that's Bundle contract*/) {
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165 throw new IllegalStateException(String.format("Revision %s needs a parent %s, which is missing in the supplied repo %s", ge.node().shortNotation(), base.shortNotation(), hgRepo.toString()));
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166 }
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167 ByteArrayChannel bac = new ByteArrayChannel();
418
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168 changelog.rawContent(base, bac); // TODO post-1.0 get DataAccess directly, to avoid
169
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169 // extra byte[] (inside ByteArrayChannel) duplication just for the sake of subsequent ByteArrayDataChannel wrap.
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170 prevRevContent = new ByteArrayDataAccess(bac.toArray());
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171 }
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172 }
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173 //
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174 byte[] csetContent = ge.patch().apply(prevRevContent, -1);
169
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175 dh = dh.sha1(ge.firstParent(), ge.secondParent(), csetContent); // XXX ge may give me access to byte[] content of nodeid directly, perhaps, I don't need DH to be friend of Nodeid?
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176 if (!ge.node().equalsTo(dh.asBinary())) {
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177 throw new HgInvalidStateException(String.format("Integrity check failed on %s, node: %s", bundleFile, ge.node().shortNotation()));
169
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178 }
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179 RawChangeset cs = csetBuilder.parse(csetContent);
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180 inspector.next(revisionIndex++, ge.node(), cs);
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181 prevRevContent.done();
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182 prevRevContent = new ByteArrayDataAccess(csetContent);
169
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183 } catch (CancelledException ex) {
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184 return false;
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185 } catch (HgInvalidDataFormatException ex) {
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186 throw new HgInvalidControlFileException("Invalid bundle file", ex, bundleFile);
169
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187 }
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188 return true;
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189 }
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190
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191 public void manifestStart() {}
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192 public void manifestEnd() {}
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193 public void fileStart(String name) {}
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194 public void fileEnd(String name) {}
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195
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196 };
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197 inspectChangelog(bundleInsp);
169
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198 }
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199
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200 // callback to minimize amount of Strings and Nodeids instantiated
512
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201 @Callback
169
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202 public interface Inspector {
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203 void changelogStart() throws HgRuntimeException;
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204
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205 void changelogEnd() throws HgRuntimeException;
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206
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207 void manifestStart() throws HgRuntimeException;
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208
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209 void manifestEnd() throws HgRuntimeException;
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210
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211 void fileStart(String name) throws HgRuntimeException;
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212
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213 void fileEnd(String name) throws HgRuntimeException;
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214
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215 /**
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216 * @param element data element, instance might be reused, don't keep a reference to it or its raw data
169
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217 * @return <code>true</code> to continue
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218 * @throws IOException propagated exception from {@link GroupElement#data()}
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219 * @throws HgRuntimeException propagated exception (subclass thereof) to indicate issues with the library. <em>Runtime exception</em>
169
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220 */
673
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221 boolean element(GroupElement element) throws IOException, HgRuntimeException;
169
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222 }
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223
423
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224 /**
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225 * @param inspector callback to visit changelog entries
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226 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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227 * @throws IllegalArgumentException if inspector argument is null
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228 */
673
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229 public void inspectChangelog(Inspector inspector) throws HgIOException, HgRuntimeException {
169
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230 if (inspector == null) {
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231 throw new IllegalArgumentException();
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232 }
512
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233 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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234 DataAccess da = null;
169
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235 try {
295
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236 da = getDataStream();
182
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237 internalInspectChangelog(da, inspector);
295
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238 } catch (IOException ex) {
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239 throw new HgIOException("Failed to inspect changelog in the bundle", ex, bundleFile);
37
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240 } finally {
295
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241 if (da != null) {
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242 da.done();
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243 }
512
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244 lifecycleTearDown(lifecycle);
37
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245 }
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246 }
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247
423
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248 /**
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249 * @param inspector callback to visit manifest entries
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250 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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251 * @throws IllegalArgumentException if inspector argument is null
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252 */
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253 public void inspectManifest(Inspector inspector) throws HgIOException, HgRuntimeException {
169
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254 if (inspector == null) {
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255 throw new IllegalArgumentException();
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256 }
512
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257 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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258 DataAccess da = null;
36
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259 try {
295
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260 da = getDataStream();
169
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261 if (da.isEmpty()) {
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262 return;
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263 }
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264 skipGroup(da); // changelog
182
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265 internalInspectManifest(da, inspector);
295
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266 } catch (IOException ex) {
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267 throw new HgIOException("Failed to inspect manifest in the bundle", ex, bundleFile);
36
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268 } finally {
295
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269 if (da != null) {
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270 da.done();
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271 }
512
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272 lifecycleTearDown(lifecycle);
36
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273 }
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274 }
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275
423
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276 /**
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277 * @param inspector callback to visit file entries
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278 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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279 * @throws IllegalArgumentException if inspector argument is null
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280 */
673
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281 public void inspectFiles(Inspector inspector) throws HgIOException, HgRuntimeException {
169
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282 if (inspector == null) {
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283 throw new IllegalArgumentException();
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284 }
512
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285 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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286 DataAccess da = null;
169
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287 try {
295
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diff changeset
288 da = getDataStream();
182
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diff changeset
289 if (da.isEmpty()) {
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290 return;
169
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291 }
182
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diff changeset
292 skipGroup(da); // changelog
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293 if (da.isEmpty()) {
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diff changeset
294 return;
169
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295 }
182
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296 skipGroup(da); // manifest
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297 internalInspectFiles(da, inspector);
295
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298 } catch (IOException ex) {
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299 throw new HgIOException("Failed to inspect files in the bundle", ex, bundleFile);
169
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300 } finally {
295
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301 if (da != null) {
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302 da.done();
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diff changeset
303 }
512
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diff changeset
304 lifecycleTearDown(lifecycle);
169
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305 }
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diff changeset
306 }
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diff changeset
307
423
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308 /**
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diff changeset
309 * @param inspector visit complete bundle (changelog, manifest and file entries)
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310 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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311 * @throws IllegalArgumentException if inspector argument is null
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diff changeset
312 */
673
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diff changeset
313 public void inspectAll(Inspector inspector) throws HgIOException, HgRuntimeException {
169
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diff changeset
314 if (inspector == null) {
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diff changeset
315 throw new IllegalArgumentException();
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diff changeset
316 }
512
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diff changeset
317 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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318 DataAccess da = null;
169
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diff changeset
319 try {
295
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diff changeset
320 da = getDataStream();
182
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diff changeset
321 internalInspectChangelog(da, inspector);
513
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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parents: 512
diff changeset
322 if (flowControl.isStopped()) {
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
323 return;
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
324 }
182
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diff changeset
325 internalInspectManifest(da, inspector);
513
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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parents: 512
diff changeset
326 if (flowControl.isStopped()) {
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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parents: 512
diff changeset
327 return;
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
328 }
182
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diff changeset
329 internalInspectFiles(da, inspector);
295
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diff changeset
330 } catch (IOException ex) {
673
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diff changeset
331 throw new HgIOException("Failed to inspect bundle", ex, bundleFile);
169
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diff changeset
332 } finally {
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
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diff changeset
333 if (da != null) {
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diff changeset
334 da.done();
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
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diff changeset
335 }
512
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
336 lifecycleTearDown(lifecycle);
169
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
337 }
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
338 }
512
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
339
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
340 // initialize flowControl, check for concurrent usage, starts lifecyle, if any
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
341 // return non-null only if inspector is interested in lifecycle events
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diff changeset
342 private Lifecycle lifecycleSetUp(Inspector inspector) throws ConcurrentModificationException {
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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parents: 467
diff changeset
343 // Don't need flowControl in case Inspector doesn't implement Lifecycle,
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diff changeset
344 // however is handy not to expect it == null inside internalInspect*
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diff changeset
345 // XXX Once there's need to make this class thread-safe,
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
346 // shall move flowControl to thread-local state.
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
347 if (flowControl != null) {
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diff changeset
348 throw new ConcurrentModificationException("HgBundle is in use and not thread-safe yet");
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
349 }
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
350 flowControl = new Lifecycle.BasicCallback();
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diff changeset
351 final Lifecycle lifecycle = Adaptable.Factory.getAdapter(inspector, Lifecycle.class, null);
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
352 if (lifecycle != null) {
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diff changeset
353 lifecycle.start(-1, flowControl, flowControl);
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diff changeset
354 }
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diff changeset
355 return lifecycle;
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diff changeset
356 }
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
357
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diff changeset
358 private void lifecycleTearDown(Lifecycle lifecycle) {
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
359 if (lifecycle != null) {
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diff changeset
360 lifecycle.finish(flowControl);
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diff changeset
361 }
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diff changeset
362 flowControl = null;
10ca3ede8367 Issue 39: Progress and Cancel support for Clone command
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diff changeset
363 }
169
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diff changeset
364
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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diff changeset
365 private void internalInspectChangelog(DataAccess da, Inspector inspector) throws IOException, HgRuntimeException {
182
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diff changeset
366 if (da.isEmpty()) {
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diff changeset
367 return;
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
368 }
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
369 inspector.changelogStart();
513
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
370 if (flowControl.isStopped()) {
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
371 return;
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
372 }
182
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diff changeset
373 readGroup(da, inspector);
513
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
374 if (flowControl.isStopped()) {
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
375 return;
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
376 }
182
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diff changeset
377 inspector.changelogEnd();
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diff changeset
378 }
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
379
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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diff changeset
380 private void internalInspectManifest(DataAccess da, Inspector inspector) throws IOException, HgRuntimeException {
182
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diff changeset
381 if (da.isEmpty()) {
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diff changeset
382 return;
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
383 }
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
384 inspector.manifestStart();
513
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
385 if (flowControl.isStopped()) {
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
386 return;
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
387 }
182
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
388 readGroup(da, inspector);
513
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
389 if (flowControl.isStopped()) {
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
390 return;
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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diff changeset
391 }
182
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
392 inspector.manifestEnd();
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
393 }
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
394
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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diff changeset
395 private void internalInspectFiles(DataAccess da, Inspector inspector) throws IOException, HgRuntimeException {
182
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
396 while (!da.isEmpty()) {
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
397 int fnameLen = da.readInt();
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
398 if (fnameLen <= 4) {
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
399 break; // null chunk, the last one.
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
400 }
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
401 byte[] fnameBuf = new byte[fnameLen - 4];
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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parents: 170
diff changeset
402 da.readBytes(fnameBuf, 0, fnameBuf.length);
667
fba85bc1dfb8 Refactoring: move all encoding/decoding operations into single place, EncodingHelper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 663
diff changeset
403 String name = fnDecorer.fromBundle(fnameBuf, 0, fnameBuf.length);
182
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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diff changeset
404 inspector.fileStart(name);
513
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 512
diff changeset
405 if (flowControl.isStopped()) {
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 512
diff changeset
406 return;
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 512
diff changeset
407 }
182
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
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parents: 170
diff changeset
408 readGroup(da, inspector);
513
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 512
diff changeset
409 if (flowControl.isStopped()) {
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 512
diff changeset
410 return;
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 512
diff changeset
411 }
182
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
412 inspector.fileEnd(name);
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
413 }
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
414 }
f26ffe04ced0 Refactor HgBundle to dispatch changes found through callback
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 170
diff changeset
415
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 606
diff changeset
416 private static void readGroup(DataAccess da, Inspector inspector) throws IOException, HgRuntimeException {
36
205f9b59b400 Strip parsing logic out from console frontend
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parents:
diff changeset
417 int len = da.readInt();
169
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
418 boolean good2go = true;
663
46b56864b483 Pull: phase2 - update phases from remote, fncache with added files. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 654
diff changeset
419 Nodeid prevNodeid = null;
169
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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diff changeset
420 while (len > 4 && !da.isEmpty() && good2go) {
36
205f9b59b400 Strip parsing logic out from console frontend
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parents:
diff changeset
421 byte[] nb = new byte[80];
205f9b59b400 Strip parsing logic out from console frontend
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parents:
diff changeset
422 da.readBytes(nb, 0, 80);
169
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
423 int dataLength = len - 84 /* length field + 4 nodeids */;
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
424 byte[] data = new byte[dataLength];
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
425 da.readBytes(data, 0, dataLength);
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
426 DataAccess slice = new ByteArrayDataAccess(data); // XXX in fact, may pass a slicing DataAccess.
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
427 // Just need to make sure that we seek to proper location afterwards (where next GroupElement starts),
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
428 // regardless whether that slice has read it or not.
532
688c1ab113bb Introduce explicit reference to base patch in bundle's group element, use it when cloning to fix defect when few revisions list null,null parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 526
diff changeset
429 GroupElement ge = new GroupElement(nb, prevNodeid, slice);
169
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
430 good2go = inspector.element(ge);
170
71ddbf8603e8 Initial clone: populate given directory from a bundle. Everything but remote server access is there, albeit prototype code style
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 169
diff changeset
431 slice.done(); // BADA doesn't implement done(), but it could (e.g. free array)
71ddbf8603e8 Initial clone: populate given directory from a bundle. Everything but remote server access is there, albeit prototype code style
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parents: 169
diff changeset
432 /// and we'd better tell it we are not going to use it any more. However, it's important to ensure Inspector
71ddbf8603e8 Initial clone: populate given directory from a bundle. Everything but remote server access is there, albeit prototype code style
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 169
diff changeset
433 // implementations out there do not retain GroupElement.rawData()
532
688c1ab113bb Introduce explicit reference to base patch in bundle's group element, use it when cloning to fix defect when few revisions list null,null parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 526
diff changeset
434 prevNodeid = ge.node();
36
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
435 len = da.isEmpty() ? 0 : da.readInt();
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
436 }
169
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
437 // need to skip up to group end if inspector told he don't want to continue with the group,
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
438 // because outer code may try to read next group immediately as we return back.
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
439 while (len > 4 && !da.isEmpty()) {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
440 da.skip(len - 4 /* length field */);
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
441 len = da.isEmpty() ? 0 : da.readInt();
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
442 }
36
205f9b59b400 Strip parsing logic out from console frontend
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
443 }
205f9b59b400 Strip parsing logic out from console frontend
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parents:
diff changeset
444
169
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
445 private static void skipGroup(DataAccess da) throws IOException {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
446 int len = da.readInt();
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
447 while (len > 4 && !da.isEmpty()) {
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
448 da.skip(len - 4); // sizeof(int)
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
449 len = da.isEmpty() ? 0 : da.readInt();
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
450 }
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
451 }
8c8e3f372fa1 Towards initial clone: refactor HgBundle to provide slightly higher-level structure of the bundle
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parents: 157
diff changeset
452
673
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453 /**
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454 * Describes single element (a.k.a. chunk) of the group, either changelog, manifest or a file.
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455 */
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456 public static final class GroupElement {
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457 private final byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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458 private final DataAccess dataAccess;
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459 private final Nodeid deltaBase;
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460 private Patch patches;
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461
532
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462 GroupElement(byte[] fourNodeids, Nodeid deltaBaseRev, DataAccess rawDataAccess) {
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463 assert fourNodeids != null && fourNodeids.length == 80;
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464 header = fourNodeids;
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465 deltaBase = deltaBaseRev;
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466 dataAccess = rawDataAccess;
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467 }
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468
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469 /**
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470 * <b>node</b> field of the group element
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471 * @return node revision, never <code>null</code>
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472 */
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473 public Nodeid node() {
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474 return Nodeid.fromBinary(header, 0);
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475 }
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476
358
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477 /**
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478 * <b>p1</b> <i>(parent 1)</i> field of the group element
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479 * @return revision of parent 1, never <code>null</code>
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480 */
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481 public Nodeid firstParent() {
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482 return Nodeid.fromBinary(header, 20);
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483 }
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484
358
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485 /**
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486 * <b>p2</b> <i>(parent 2)</i> field of the group element
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487 * @return revision of parent 2, never <code>null</code>
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488 */
36
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489 public Nodeid secondParent() {
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490 return Nodeid.fromBinary(header, 40);
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491 }
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492
358
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493 /**
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494 * <b>cs</b> <i>(changeset link)</i> field of the group element
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495 * @return changeset revision, never <code>null</code>
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496 */
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497 public Nodeid cset() {
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498 return Nodeid.fromBinary(header, 60);
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499 }
358
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500
532
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501 /**
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502 * Revision this element keeps patches against. For the patches of the very first revision returns {@link Nodeid#NULL}.
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503 * @return revision of delta base, never <code>null</code>
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504 */
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505 public Nodeid patchBase() {
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506 return deltaBase == null ? firstParent() : deltaBase;
532
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507 }
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diff changeset
508
673
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509 /**
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510 * Read data of the group element.
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511 * Note, {@link InputStream streams} obtained from several calls to this method
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512 * can't be read simultaneously.
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513 *
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514 * @return stream to access content of this group element, never <code>null</code>
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515 */
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516 public InputStream data() {
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517 return new DataAccessInputStream(dataAccess);
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518 }
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519
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520 /*package-local*/ Patch patch() throws IOException {
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521 if (patches == null) {
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522 dataAccess.reset();
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523 patches = new Patch();
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524 patches.read(dataAccess);
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525 }
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diff changeset
526 return patches;
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527 }
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528
357
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529 public String toString() {
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530 int patchCount;
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531 try {
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532 patchCount = patch().count();
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533 } catch (IOException ex) {
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534 ex.printStackTrace();
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535 patchCount = -1;
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536 }
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537 return String.format("%s %s %s %s; patches:%d\n", node().shortNotation(), firstParent().shortNotation(), secondParent().shortNotation(), cset().shortNotation(), patchCount);
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538 }
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539 }
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540 }