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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 617:65c01508f002

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Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 15 May 2013 20:10:09 +0200
parents e1b29756f901
children 7c0d2ce340b8
rev   line source
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1 /*
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2 * Copyright (c) 2010-2013 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.internal;
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18
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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20 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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22 import java.io.File;
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23 import java.io.FileInputStream;
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24 import java.io.FileNotFoundException;
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25 import java.io.FileOutputStream;
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26 import java.io.IOException;
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27 import java.io.OutputStream;
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28 import java.nio.ByteBuffer;
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29 import java.nio.MappedByteBuffer;
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30 import java.nio.channels.FileChannel;
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31
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32 import org.tmatesoft.hg.core.HgIOException;
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33 import org.tmatesoft.hg.core.SessionContext;
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34 import org.tmatesoft.hg.util.LogFacility;
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35
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36 /**
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public class DataAccessProvider {
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42 /**
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43 * Boundary to start using file memory mapping instead of regular file access, in bytes.
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44 * Set to 0 to indicate mapping files into memory shall not be used.
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45 * If set to -1, file of any size would be mapped in memory.
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46 */
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47 public static final String CFG_PROPERTY_MAPIO_LIMIT = "hg4j.dap.mapio_limit";
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48 public static final String CFG_PROPERTY_MAPIO_BUFFER_SIZE = "hg4j.dap.mapio_buffer";
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49 public static final String CFG_PROPERTY_FILE_BUFFER_SIZE = "hg4j.dap.file_buffer";
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50
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51 private static final int DEFAULT_MAPIO_LIMIT = 100 * 1024; // 100 kB
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52 private static final int DEFAULT_FILE_BUFFER = 8 * 1024; // 8 kB
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53 private static final int DEFAULT_MAPIO_BUFFER = DEFAULT_MAPIO_LIMIT; // same as default boundary
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55 private final int mapioMagicBoundary;
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56 private final int bufferSize, mapioBufSize;
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57 private final SessionContext context;
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58
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59 public DataAccessProvider(SessionContext ctx) {
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60 context = ctx;
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61 PropertyMarshal pm = new PropertyMarshal(ctx);
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62 mapioMagicBoundary = mapioBoundaryValue(pm.getInt(CFG_PROPERTY_MAPIO_LIMIT, DEFAULT_MAPIO_LIMIT));
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63 bufferSize = pm.getInt(CFG_PROPERTY_FILE_BUFFER_SIZE, DEFAULT_FILE_BUFFER);
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64 mapioBufSize = pm.getInt(CFG_PROPERTY_MAPIO_BUFFER_SIZE, DEFAULT_MAPIO_BUFFER);
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65 }
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66
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67 public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize, int mapioBufferSize) {
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68 context = ctx;
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69 mapioMagicBoundary = mapioBoundaryValue(mapioBoundary);
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70 bufferSize = regularBufferSize;
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71 mapioBufSize = mapioBufferSize;
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72 }
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74 // ensure contract of CFG_PROPERTY_MAPIO_LIMIT, for mapioBoundary == 0 use MAX_VALUE so that no file is memmap-ed
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75 private static int mapioBoundaryValue(int mapioBoundary) {
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76 return mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
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77 }
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78
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79 public DataAccess createReader(File f, boolean shortRead) {
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80 if (!f.exists()) {
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81 return new DataAccess();
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82 }
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83 try {
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84 FileChannel fc = new FileInputStream(f).getChannel(); // FIXME SHALL CLOSE FIS, not only channel
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85 long flen = fc.size();
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86 if (!shortRead && flen > mapioMagicBoundary) {
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87 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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88 return new MemoryMapFileAccess(fc, flen, mapioBufSize, context.getLog());
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89 } else {
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90 // XXX once implementation is more or less stable,
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91 // may want to try ByteBuffer.allocateDirect() to see
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92 // if there's any performance gain.
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93 boolean useDirectBuffer = false; // XXX might be another config option
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94 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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95 return new FileAccess(fc, flen, bufferSize, useDirectBuffer, context.getLog());
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96 }
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97 } catch (IOException ex) {
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98 // unlikely to happen, we've made sure file exists.
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99 context.getLog().dump(getClass(), Error, ex, null);
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100 }
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101 return new DataAccess(); // non-null, empty.
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102 }
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103
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104 public DataSerializer createWriter(final Transaction tr, File f, boolean createNewIfDoesntExist) throws HgIOException {
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105 if (!f.exists() && !createNewIfDoesntExist) {
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106 return new DataSerializer();
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107 }
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108 try {
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109 final File transactionFile = tr.prepare(f);
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110 return new StreamDataSerializer(context.getLog(), new FileOutputStream(transactionFile, true)) {
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111 @Override
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112 public void done() {
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113 super.done();
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114 // FIXME invert RevlogStreamWriter to send DataSource here instead of grabbing DataSerializer
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115 // besides, DataSerializer#done is invoked regardless of whether write was successful or not,
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116 // while Transaction#done() assumes there's no error
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117 try {
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118 tr.done(transactionFile);
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119 } catch (HgIOException ex) {
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120 context.getLog().dump(DataAccessProvider.class, Error, ex, null);
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121 }
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122 }
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123 };
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124 } catch (final FileNotFoundException ex) {
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125 context.getLog().dump(getClass(), Error, ex, null);
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126 return new DataSerializer() {
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127 public void write(byte[] data, int offset, int length) throws IOException {
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128 throw ex;
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129 }
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130 };
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131 }
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132 }
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133
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134 private static class MemoryMapFileAccess extends DataAccess {
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135 private FileChannel fileChannel;
425
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136 private long position = 0; // always points to buffer's absolute position in the file
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137 private MappedByteBuffer buffer;
420
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138 private final long size;
26
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139 private final int memBufferSize;
425
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140 private final LogFacility logFacility;
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141
425
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142 public MemoryMapFileAccess(FileChannel fc, long channelSize, int bufferSize, LogFacility log) {
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143 fileChannel = fc;
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144 size = channelSize;
425
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145 logFacility = log;
420
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146 memBufferSize = bufferSize > channelSize ? (int) channelSize : bufferSize; // no reason to waste memory more than there's data
10
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147 }
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148
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149 @Override
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150 public boolean isEmpty() {
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151 return position + (buffer == null ? 0 : buffer.position()) >= size;
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152 }
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153
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154 @Override
420
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155 public DataAccess reset() throws IOException {
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156 longSeek(0);
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157 return this;
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158 }
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159
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160 @Override
158
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161 public int length() {
420
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162 return Internals.ltoi(longLength());
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163 }
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164
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165 @Override
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166 public long longLength() {
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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167 return size;
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168 }
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169
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170 @Override
420
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171 public void longSeek(long offset) {
26
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172 assert offset >= 0;
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173 // offset may not necessarily be further than current position in the file (e.g. rewind)
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174 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
420
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175 // cast is ok according to check above
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176 buffer.position(Internals.ltoi(offset - position));
26
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177 } else {
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178 position = offset;
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179 buffer = null;
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180 }
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181 }
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182
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183 @Override
420
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184 public void seek(int offset) {
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185 longSeek(offset);
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186 }
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187
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188 @Override
10
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189 public void skip(int bytes) throws IOException {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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190 assert bytes >= 0;
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191 if (buffer == null) {
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192 position += bytes;
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diff changeset
193 return;
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194 }
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diff changeset
195 if (buffer.remaining() > bytes) {
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diff changeset
196 buffer.position(buffer.position() + bytes);
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197 } else {
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198 position += buffer.position() + bytes;
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199 buffer = null;
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diff changeset
200 }
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201 }
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diff changeset
202
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
203 private void fill() throws IOException {
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diff changeset
204 if (buffer != null) {
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diff changeset
205 position += buffer.position();
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diff changeset
206 }
10
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diff changeset
207 long left = size - position;
440
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diff changeset
208 for (int i = 0; i < 3; i++) {
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diff changeset
209 try {
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diff changeset
210 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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diff changeset
211 return;
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diff changeset
212 } catch (IOException ex) {
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diff changeset
213 if (i == 2) {
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diff changeset
214 throw ex;
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diff changeset
215 }
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diff changeset
216 if (i == 0) {
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diff changeset
217 // if first attempt failed, try to free some virtual memory, see Issue 30 for details
456
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diff changeset
218 logFacility.dump(getClass(), Warn, ex, "Memory-map failed, gonna try gc() to free virtual memory");
440
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diff changeset
219 }
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diff changeset
220 try {
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diff changeset
221 buffer = null;
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diff changeset
222 System.gc();
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diff changeset
223 Thread.sleep((1+i) * 1000);
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diff changeset
224 } catch (Throwable t) {
456
909306e412e2 Refactor LogFacility and SessionContext, better API for both
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diff changeset
225 logFacility.dump(getClass(), Error, t, "Bad luck");
440
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diff changeset
226 }
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diff changeset
227 }
299870249a28 Issue 30: bogus IOException for mmap file on linux
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diff changeset
228 }
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
229 }
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diff changeset
230
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231 @Override
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232 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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233 if (buffer == null || !buffer.hasRemaining()) {
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234 fill();
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235 }
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236 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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237 while (length > 0) {
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238 int tail = buffer.remaining();
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239 if (tail == 0) {
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240 throw new IOException();
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241 }
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242 if (tail >= length) {
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243 buffer.get(buf, offset, length);
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244 } else {
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245 buffer.get(buf, offset, tail);
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246 fill();
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247 }
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248 offset += tail;
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249 length -= tail;
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250 }
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251 }
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252
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253 @Override
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254 public byte readByte() throws IOException {
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255 if (buffer == null || !buffer.hasRemaining()) {
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256 fill();
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257 }
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258 if (buffer.hasRemaining()) {
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259 return buffer.get();
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260 }
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261 throw new IOException();
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262 }
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263
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264 @Override
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265 public void done() {
26
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266 buffer = null;
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267 if (fileChannel != null) {
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268 try {
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269 fileChannel.close();
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270 } catch (IOException ex) {
456
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271 logFacility.dump(getClass(), Warn, ex, null);
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272 }
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273 fileChannel = null;
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274 }
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275 }
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276 }
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277
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278 // (almost) regular file access - FileChannel and buffers.
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279 private static class FileAccess extends DataAccess {
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280 private FileChannel fileChannel;
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281 private ByteBuffer buffer;
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282 private long bufferStartInFile = 0; // offset of this.buffer in the file.
425
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283 private final long size;
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284 private final LogFacility logFacility;
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285
425
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286 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect, LogFacility log) {
10
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287 fileChannel = fc;
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288 size = channelSize;
425
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289 logFacility = log;
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290 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
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291 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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292 buffer.flip(); // or .limit(0) to indicate it's empty
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293 }
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294
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295 @Override
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296 public boolean isEmpty() {
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297 return bufferStartInFile + buffer.position() >= size;
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298 }
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299
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300 @Override
420
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301 public DataAccess reset() throws IOException {
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302 longSeek(0);
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303 return this;
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304 }
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305
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306 @Override
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
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diff changeset
307 public int length() {
420
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diff changeset
308 return Internals.ltoi(longLength());
51
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diff changeset
309 }
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310
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diff changeset
311 @Override
420
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diff changeset
312 public long longLength() {
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diff changeset
313 return size;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
314 }
420
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diff changeset
315
51
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diff changeset
316 @Override
420
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diff changeset
317 public void longSeek(long offset) throws IOException {
23
6f9aca1a97be Severe defect in buffer wrap on seek
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diff changeset
318 if (offset > size) {
404
31a719b9f95e Provide more detailed information on erroneous file operation
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diff changeset
319 throw new IllegalArgumentException(String.format("Can't seek to %d for the file of size %d (buffer start:%d)", offset, size, bufferStartInFile));
23
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diff changeset
320 }
10
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diff changeset
321 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
420
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diff changeset
322 // cast to int is safe, we've checked we fit into buffer
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diff changeset
323 buffer.position(Internals.ltoi(offset - bufferStartInFile));
10
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324 } else {
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diff changeset
325 // out of current buffer, invalidate it (force re-read)
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diff changeset
326 // XXX or ever re-read it right away?
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327 bufferStartInFile = offset;
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diff changeset
328 buffer.clear();
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diff changeset
329 buffer.limit(0); // or .flip() to indicate we switch to reading
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330 fileChannel.position(offset);
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diff changeset
331 }
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diff changeset
332 }
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diff changeset
333
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
334 @Override
420
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diff changeset
335 public void seek(int offset) throws IOException {
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diff changeset
336 longSeek(offset);
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diff changeset
337 }
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diff changeset
338
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diff changeset
339 @Override
10
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340 public void skip(int bytes) throws IOException {
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diff changeset
341 final int newPos = buffer.position() + bytes;
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diff changeset
342 if (newPos >= 0 && newPos < buffer.limit()) {
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diff changeset
343 // no need to move file pointer, just rewind/seek buffer
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344 buffer.position(newPos);
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diff changeset
345 } else {
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diff changeset
346 //
420
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diff changeset
347 longSeek(bufferStartInFile + newPos);
10
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348 }
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diff changeset
349 }
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350
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diff changeset
351 private boolean fill() throws IOException {
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diff changeset
352 if (!buffer.hasRemaining()) {
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353 bufferStartInFile += buffer.limit();
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354 buffer.clear();
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355 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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356 fileChannel.read(buffer);
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357 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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358 }
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359 buffer.flip();
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360 }
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361 return buffer.hasRemaining();
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362 }
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363
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364 @Override
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365 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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366 if (!buffer.hasRemaining()) {
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367 fill();
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368 }
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369 while (length > 0) {
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370 int tail = buffer.remaining();
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371 if (tail == 0) {
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372 throw new IOException(); // shall not happen provided stream contains expected data and no attempts to read past isEmpty() == true are made.
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373 }
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374 if (tail >= length) {
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375 buffer.get(buf, offset, length);
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376 } else {
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377 buffer.get(buf, offset, tail);
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378 fill();
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379 }
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380 offset += tail;
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381 length -= tail;
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382 }
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383 }
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384
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385 @Override
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386 public byte readByte() throws IOException {
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387 if (buffer.hasRemaining()) {
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388 return buffer.get();
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389 }
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390 if (fill()) {
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391 return buffer.get();
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392 }
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393 throw new IOException();
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394 }
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395
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396 @Override
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397 public void done() {
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398 if (buffer != null) {
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399 buffer = null;
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400 }
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401 if (fileChannel != null) {
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402 try {
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403 fileChannel.close();
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404 } catch (IOException ex) {
456
909306e412e2 Refactor LogFacility and SessionContext, better API for both
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diff changeset
405 logFacility.dump(getClass(), Warn, ex, null);
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406 }
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407 fileChannel = null;
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diff changeset
408 }
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409 }
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410 }
534
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411
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diff changeset
412 public/*XXX, private, once HgCloneCommand stops using it */ static class StreamDataSerializer extends DataSerializer {
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413 private final OutputStream out;
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diff changeset
414 private final LogFacility log;
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415 private byte[] buffer;
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416
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417 public StreamDataSerializer(LogFacility logFacility, OutputStream os) {
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418 assert os != null;
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419 out = os;
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420 log = logFacility;
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421 }
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422
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diff changeset
423 @Override
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424 public void write(byte[] data, int offset, int length) throws IOException {
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425 out.write(data, offset, length);
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426 }
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diff changeset
427
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diff changeset
428 @Override
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429 public void writeInt(int... values) throws IOException {
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diff changeset
430 ensureBufferSize(4*values.length); // sizeof(int)
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431 int idx = 0;
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432 for (int v : values) {
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diff changeset
433 DataSerializer.bigEndian(v, buffer, idx);
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diff changeset
434 idx += 4;
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diff changeset
435 }
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diff changeset
436 out.write(buffer, 0, idx);
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diff changeset
437 }
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diff changeset
438
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diff changeset
439 @Override
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440 public void writeByte(byte... values) throws IOException {
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diff changeset
441 if (values.length == 1) {
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diff changeset
442 out.write(values[0]);
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diff changeset
443 } else {
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444 out.write(values, 0, values.length);
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diff changeset
445 }
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parents: 494
diff changeset
446 }
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diff changeset
447
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diff changeset
448 private void ensureBufferSize(int bytesNeeded) {
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diff changeset
449 if (buffer == null || buffer.length < bytesNeeded) {
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450 buffer = new byte[bytesNeeded];
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diff changeset
451 }
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parents: 494
diff changeset
452 }
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diff changeset
453
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diff changeset
454 @Override
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455 public void done() {
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456 try {
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457 out.flush();
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458 out.close();
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diff changeset
459 } catch (IOException ex) {
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460 log.dump(getClass(), Error, ex, "Failure to close stream");
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diff changeset
461 }
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diff changeset
462 }
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diff changeset
463 }
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464 }