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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 618:7c0d2ce340b8

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Refactor approach how content finds it way down to a commit revision
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 16 May 2013 19:46:13 +0200
parents 65c01508f002
children 868b2ffdcd5c
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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21
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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.FileOutputStream;
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25 import java.io.IOException;
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26 import java.nio.ByteBuffer;
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27 import java.nio.MappedByteBuffer;
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28 import java.nio.channels.FileChannel;
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29
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30 import org.tmatesoft.hg.core.HgIOException;
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31 import org.tmatesoft.hg.core.SessionContext;
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32 import org.tmatesoft.hg.util.LogFacility;
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33
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34 /**
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35 *
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36 * @author Artem Tikhomirov
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37 * @author TMate Software Ltd.
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38 */
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39 public class DataAccessProvider {
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40 /**
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41 * Boundary to start using file memory mapping instead of regular file access, in bytes.
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42 * Set to 0 to indicate mapping files into memory shall not be used.
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43 * If set to -1, file of any size would be mapped in memory.
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44 */
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45 public static final String CFG_PROPERTY_MAPIO_LIMIT = "hg4j.dap.mapio_limit";
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46 public static final String CFG_PROPERTY_MAPIO_BUFFER_SIZE = "hg4j.dap.mapio_buffer";
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47 public static final String CFG_PROPERTY_FILE_BUFFER_SIZE = "hg4j.dap.file_buffer";
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48
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49 private static final int DEFAULT_MAPIO_LIMIT = 100 * 1024; // 100 kB
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50 private static final int DEFAULT_FILE_BUFFER = 8 * 1024; // 8 kB
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51 private static final int DEFAULT_MAPIO_BUFFER = DEFAULT_MAPIO_LIMIT; // same as default boundary
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53 private final int mapioMagicBoundary;
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54 private final int bufferSize, mapioBufSize;
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55 private final SessionContext context;
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56
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57 public DataAccessProvider(SessionContext ctx) {
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58 context = ctx;
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59 PropertyMarshal pm = new PropertyMarshal(ctx);
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60 mapioMagicBoundary = mapioBoundaryValue(pm.getInt(CFG_PROPERTY_MAPIO_LIMIT, DEFAULT_MAPIO_LIMIT));
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61 bufferSize = pm.getInt(CFG_PROPERTY_FILE_BUFFER_SIZE, DEFAULT_FILE_BUFFER);
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62 mapioBufSize = pm.getInt(CFG_PROPERTY_MAPIO_BUFFER_SIZE, DEFAULT_MAPIO_BUFFER);
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63 }
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64
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65 public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize, int mapioBufferSize) {
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66 context = ctx;
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67 mapioMagicBoundary = mapioBoundaryValue(mapioBoundary);
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68 bufferSize = regularBufferSize;
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69 mapioBufSize = mapioBufferSize;
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70 }
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72 // ensure contract of CFG_PROPERTY_MAPIO_LIMIT, for mapioBoundary == 0 use MAX_VALUE so that no file is memmap-ed
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73 private static int mapioBoundaryValue(int mapioBoundary) {
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74 return mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
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75 }
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76
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77 public DataAccess createReader(File f, boolean shortRead) {
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78 if (!f.exists()) {
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79 return new DataAccess();
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80 }
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81 try {
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82 FileChannel fc = new FileInputStream(f).getChannel(); // FIXME SHALL CLOSE FIS, not only channel
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83 long flen = fc.size();
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84 if (!shortRead && flen > mapioMagicBoundary) {
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85 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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86 return new MemoryMapFileAccess(fc, flen, mapioBufSize, context.getLog());
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87 } else {
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88 // XXX once implementation is more or less stable,
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89 // may want to try ByteBuffer.allocateDirect() to see
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90 // if there's any performance gain.
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91 boolean useDirectBuffer = false; // XXX might be another config option
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92 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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93 return new FileAccess(fc, flen, bufferSize, useDirectBuffer, context.getLog());
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94 }
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95 } catch (IOException ex) {
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96 // unlikely to happen, we've made sure file exists.
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97 context.getLog().dump(getClass(), Error, ex, null);
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98 }
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99 return new DataAccess(); // non-null, empty.
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100 }
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101
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102 public DataSerializer createWriter(final Transaction tr, File f, boolean createNewIfDoesntExist) {
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103 if (!f.exists() && !createNewIfDoesntExist) {
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104 return new DataSerializer();
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105 }
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106 // TODO invert RevlogStreamWriter to send DataSource here instead of grabbing DataSerializer
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107 // to control the moment transaction gets into play and whether it fails or not
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108 return new TransactionAwareFileSerializer(tr, f);
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109 }
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110
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111 private static class MemoryMapFileAccess extends DataAccess {
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112 private FileChannel fileChannel;
425
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113 private long position = 0; // always points to buffer's absolute position in the file
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114 private MappedByteBuffer buffer;
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115 private final long size;
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116 private final int memBufferSize;
425
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117 private final LogFacility logFacility;
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118
425
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119 public MemoryMapFileAccess(FileChannel fc, long channelSize, int bufferSize, LogFacility log) {
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120 fileChannel = fc;
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121 size = channelSize;
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122 logFacility = log;
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123 memBufferSize = bufferSize > channelSize ? (int) channelSize : bufferSize; // no reason to waste memory more than there's data
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124 }
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125
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126 @Override
26
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127 public boolean isEmpty() {
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128 return position + (buffer == null ? 0 : buffer.position()) >= size;
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129 }
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130
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131 @Override
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132 public DataAccess reset() throws IOException {
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133 longSeek(0);
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134 return this;
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135 }
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136
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137 @Override
158
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138 public int length() {
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139 return Internals.ltoi(longLength());
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140 }
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141
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142 @Override
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143 public long longLength() {
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144 return size;
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145 }
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146
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147 @Override
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148 public void longSeek(long offset) {
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149 assert offset >= 0;
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150 // offset may not necessarily be further than current position in the file (e.g. rewind)
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151 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
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152 // cast is ok according to check above
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153 buffer.position(Internals.ltoi(offset - position));
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154 } else {
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155 position = offset;
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156 buffer = null;
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157 }
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158 }
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159
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160 @Override
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161 public void seek(int offset) {
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162 longSeek(offset);
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163 }
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164
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165 @Override
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166 public void skip(int bytes) throws IOException {
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167 assert bytes >= 0;
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168 if (buffer == null) {
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169 position += bytes;
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170 return;
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171 }
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172 if (buffer.remaining() > bytes) {
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173 buffer.position(buffer.position() + bytes);
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174 } else {
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175 position += buffer.position() + bytes;
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176 buffer = null;
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177 }
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178 }
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179
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180 private void fill() throws IOException {
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181 if (buffer != null) {
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182 position += buffer.position();
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183 }
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184 long left = size - position;
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185 for (int i = 0; i < 3; i++) {
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186 try {
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187 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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188 return;
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189 } catch (IOException ex) {
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190 if (i == 2) {
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191 throw ex;
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192 }
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193 if (i == 0) {
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194 // if first attempt failed, try to free some virtual memory, see Issue 30 for details
456
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195 logFacility.dump(getClass(), Warn, ex, "Memory-map failed, gonna try gc() to free virtual memory");
440
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196 }
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197 try {
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198 buffer = null;
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199 System.gc();
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200 Thread.sleep((1+i) * 1000);
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201 } catch (Throwable t) {
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202 logFacility.dump(getClass(), Error, t, "Bad luck");
440
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203 }
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204 }
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205 }
26
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206 }
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207
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208 @Override
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209 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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210 if (buffer == null || !buffer.hasRemaining()) {
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211 fill();
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212 }
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213 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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214 while (length > 0) {
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215 int tail = buffer.remaining();
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216 if (tail == 0) {
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217 throw new IOException();
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218 }
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219 if (tail >= length) {
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220 buffer.get(buf, offset, length);
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221 } else {
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222 buffer.get(buf, offset, tail);
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223 fill();
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224 }
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225 offset += tail;
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226 length -= tail;
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227 }
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228 }
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229
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230 @Override
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231 public byte readByte() throws IOException {
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232 if (buffer == null || !buffer.hasRemaining()) {
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233 fill();
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234 }
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235 if (buffer.hasRemaining()) {
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236 return buffer.get();
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237 }
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238 throw new IOException();
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239 }
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240
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241 @Override
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242 public void done() {
26
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243 buffer = null;
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244 if (fileChannel != null) {
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245 try {
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246 fileChannel.close();
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247 } catch (IOException ex) {
456
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248 logFacility.dump(getClass(), Warn, ex, null);
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249 }
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250 fileChannel = null;
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251 }
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252 }
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253 }
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254
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255 // (almost) regular file access - FileChannel and buffers.
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256 private static class FileAccess extends DataAccess {
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257 private FileChannel fileChannel;
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258 private ByteBuffer buffer;
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259 private long bufferStartInFile = 0; // offset of this.buffer in the file.
425
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260 private final long size;
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261 private final LogFacility logFacility;
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262
425
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263 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect, LogFacility log) {
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264 fileChannel = fc;
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265 size = channelSize;
425
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266 logFacility = log;
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267 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
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268 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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269 buffer.flip(); // or .limit(0) to indicate it's empty
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270 }
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271
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272 @Override
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273 public boolean isEmpty() {
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274 return bufferStartInFile + buffer.position() >= size;
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275 }
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276
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277 @Override
420
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278 public DataAccess reset() throws IOException {
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279 longSeek(0);
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280 return this;
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281 }
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282
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283 @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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284 public int length() {
420
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285 return Internals.ltoi(longLength());
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286 }
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287
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288 @Override
420
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289 public long longLength() {
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290 return size;
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diff changeset
291 }
420
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292
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293 @Override
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294 public void longSeek(long offset) throws IOException {
23
6f9aca1a97be Severe defect in buffer wrap on seek
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diff changeset
295 if (offset > size) {
404
31a719b9f95e Provide more detailed information on erroneous file operation
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diff changeset
296 throw new IllegalArgumentException(String.format("Can't seek to %d for the file of size %d (buffer start:%d)", offset, size, bufferStartInFile));
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297 }
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298 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
420
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299 // cast to int is safe, we've checked we fit into buffer
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300 buffer.position(Internals.ltoi(offset - bufferStartInFile));
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301 } else {
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302 // out of current buffer, invalidate it (force re-read)
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303 // XXX or ever re-read it right away?
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304 bufferStartInFile = offset;
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305 buffer.clear();
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306 buffer.limit(0); // or .flip() to indicate we switch to reading
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307 fileChannel.position(offset);
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diff changeset
308 }
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309 }
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310
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311 @Override
420
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diff changeset
312 public void seek(int offset) throws IOException {
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diff changeset
313 longSeek(offset);
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314 }
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315
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diff changeset
316 @Override
10
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317 public void skip(int bytes) throws IOException {
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318 final int newPos = buffer.position() + bytes;
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diff changeset
319 if (newPos >= 0 && newPos < buffer.limit()) {
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320 // no need to move file pointer, just rewind/seek buffer
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321 buffer.position(newPos);
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diff changeset
322 } else {
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diff changeset
323 //
420
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diff changeset
324 longSeek(bufferStartInFile + newPos);
10
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325 }
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326 }
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diff changeset
327
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328 private boolean fill() throws IOException {
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diff changeset
329 if (!buffer.hasRemaining()) {
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330 bufferStartInFile += buffer.limit();
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diff changeset
331 buffer.clear();
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diff changeset
332 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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diff changeset
333 fileChannel.read(buffer);
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diff changeset
334 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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335 }
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336 buffer.flip();
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diff changeset
337 }
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338 return buffer.hasRemaining();
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339 }
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340
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341 @Override
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diff changeset
342 public void readBytes(byte[] buf, int offset, int length) 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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diff changeset
343 if (!buffer.hasRemaining()) {
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diff changeset
344 fill();
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diff changeset
345 }
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diff changeset
346 while (length > 0) {
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diff changeset
347 int tail = buffer.remaining();
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diff changeset
348 if (tail == 0) {
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diff changeset
349 throw new IOException(); // shall not happen provided stream contains expected data and no attempts to read past isEmpty() == true are made.
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
350 }
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
351 if (tail >= length) {
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
352 buffer.get(buf, offset, length);
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353 } else {
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354 buffer.get(buf, offset, tail);
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355 fill();
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356 }
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357 offset += tail;
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358 length -= tail;
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359 }
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360 }
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361
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362 @Override
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363 public byte readByte() throws IOException {
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364 if (buffer.hasRemaining()) {
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365 return buffer.get();
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366 }
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367 if (fill()) {
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368 return buffer.get();
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369 }
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370 throw new IOException();
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371 }
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372
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373 @Override
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374 public void done() {
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375 if (buffer != null) {
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376 buffer = null;
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377 }
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378 if (fileChannel != null) {
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379 try {
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380 fileChannel.close();
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381 } catch (IOException ex) {
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382 logFacility.dump(getClass(), Warn, ex, null);
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383 }
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384 fileChannel = null;
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385 }
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386 }
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387 }
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388
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389 /**
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390 * Appends serialized changes to the end of the file
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391 */
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392 private static class TransactionAwareFileSerializer extends DataSerializer {
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393
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394 private final Transaction transaction;
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395 private final File file;
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396 private FileOutputStream fos;
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397 private File transactionFile;
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398 private boolean writeFailed = false;
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399
618
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400 public TransactionAwareFileSerializer(Transaction tr, File f) {
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401 transaction = tr;
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402 file = f;
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403 }
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404
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405 @Override
618
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406 public void write(byte[] data, int offset, int length) throws HgIOException {
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407 try {
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408 if (fos == null) {
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409 transactionFile = transaction.prepare(file);
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410 fos = new FileOutputStream(transactionFile, true);
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411 }
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412 fos.write(data, offset, length);
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413 fos.flush();
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414 } catch (IOException ex) {
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415 writeFailed = true;
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416 transaction.failure(transactionFile, ex);
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417 throw new HgIOException("Write failure", ex, transactionFile);
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418 }
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419 }
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420
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421 @Override
618
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422 public void done() throws HgIOException {
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423 if (fos != null) {
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424 assert transactionFile != null;
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425 try {
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426 fos.close();
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427 if (!writeFailed) {
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428 // XXX, Transaction#done() assumes there's no error , but perhaps it's easier to
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429 // rely on #failure(), and call #done() always (or change #done() to #success()
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430 transaction.done(transactionFile);
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431 }
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432 fos = null;
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433 } catch (IOException ex) {
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434 if (!writeFailed) {
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435 // do not eclipse original exception
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436 transaction.failure(transactionFile, ex);
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437 }
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438 throw new HgIOException("Write failure", ex, transactionFile);
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439 }
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440 }
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441 }
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442 }
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443 }