Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 434:7e1912b4ce99 v0.9.0

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Record few known issues while skimming through TODOs
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 30 Mar 2012 17:11:39 +0200
parents 48f993aa2f41
children 299870249a28
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import java.io.File;
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20 import java.io.FileInputStream;
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21 import java.io.IOException;
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22 import java.nio.ByteBuffer;
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23 import java.nio.MappedByteBuffer;
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24 import java.nio.channels.FileChannel;
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26 import org.tmatesoft.hg.core.SessionContext;
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27 import org.tmatesoft.hg.util.LogFacility;
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29 /**
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 public class DataAccessProvider {
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35 /**
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36 * Boundary to start using file memory mapping instead of regular file access, in bytes.
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37 * Set to 0 to indicate mapping files into memory shall not be used.
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38 * If set to -1, file of any size would be mapped in memory.
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39 */
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40 public static final String CFG_PROPERTY_MAPIO_LIMIT = "hg4j.dap.mapio_limit";
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41 public static final String CFG_PROPERTY_MAPIO_BUFFER_SIZE = "hg4j.dap.mapio_buffer";
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42 public static final String CFG_PROPERTY_FILE_BUFFER_SIZE = "hg4j.dap.file_buffer";
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43
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44 private static final int DEFAULT_MAPIO_LIMIT = 100 * 1024; // 100 kB
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45 private static final int DEFAULT_FILE_BUFFER = 8 * 1024; // 8 kB
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46 private static final int DEFAULT_MAPIO_BUFFER = DEFAULT_MAPIO_LIMIT; // same as default boundary
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48 private final int mapioMagicBoundary;
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49 private final int bufferSize;
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50 private final SessionContext context;
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51
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52 public DataAccessProvider(SessionContext ctx) {
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53 this(ctx, getConfigOption(ctx, CFG_PROPERTY_MAPIO_LIMIT, DEFAULT_MAPIO_LIMIT), getConfigOption(ctx, CFG_PROPERTY_FILE_BUFFER_SIZE, DEFAULT_FILE_BUFFER));
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54 }
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56 private static int getConfigOption(SessionContext ctx, String optName, int defaultValue) {
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57 Object v = ctx.getProperty(optName, defaultValue);
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58 if (false == v instanceof Number) {
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59 v = Integer.parseInt(v.toString());
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60 }
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61 return ((Number) v).intValue();
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62 }
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63
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64 public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize) {
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65 context = ctx;
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66 mapioMagicBoundary = mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
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67 bufferSize = regularBufferSize;
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68 }
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70 public DataAccess create(File f) {
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71 if (!f.exists()) {
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72 return new DataAccess();
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73 }
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74 try {
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75 FileChannel fc = new FileInputStream(f).getChannel();
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76 long flen = fc.size();
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77 if (flen > mapioMagicBoundary) {
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78 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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79 int mapioBufSize = getConfigOption(context, CFG_PROPERTY_MAPIO_BUFFER_SIZE, DEFAULT_MAPIO_BUFFER);
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80 return new MemoryMapFileAccess(fc, flen, mapioBufSize, context.getLog());
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81 } else {
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82 // XXX once implementation is more or less stable,
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83 // may want to try ByteBuffer.allocateDirect() to see
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84 // if there's any performance gain.
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85 boolean useDirectBuffer = false; // XXX might be another config option
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86 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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87 return new FileAccess(fc, flen, bufferSize, useDirectBuffer, context.getLog());
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88 }
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89 } catch (IOException ex) {
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90 // unlikely to happen, we've made sure file exists.
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91 context.getLog().error(getClass(), ex, null);
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92 }
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93 return new DataAccess(); // non-null, empty.
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94 }
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96 private static class MemoryMapFileAccess extends DataAccess {
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97 private FileChannel fileChannel;
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98 private long position = 0; // always points to buffer's absolute position in the file
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99 private MappedByteBuffer buffer;
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100 private final long size;
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101 private final int memBufferSize;
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102 private final LogFacility logFacility;
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103
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104 public MemoryMapFileAccess(FileChannel fc, long channelSize, int bufferSize, LogFacility log) {
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105 fileChannel = fc;
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106 size = channelSize;
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107 logFacility = log;
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108 memBufferSize = bufferSize > channelSize ? (int) channelSize : bufferSize; // no reason to waste memory more than there's data
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109 }
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110
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111 @Override
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112 public boolean isEmpty() {
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113 return position + (buffer == null ? 0 : buffer.position()) >= size;
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114 }
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115
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116 @Override
420
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117 public DataAccess reset() throws IOException {
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118 longSeek(0);
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119 return this;
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120 }
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121
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122 @Override
158
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123 public int length() {
420
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124 return Internals.ltoi(longLength());
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125 }
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126
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127 @Override
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128 public long longLength() {
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129 return size;
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130 }
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131
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132 @Override
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133 public void longSeek(long offset) {
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134 assert offset >= 0;
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135 // offset may not necessarily be further than current position in the file (e.g. rewind)
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136 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
420
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137 // cast is ok according to check above
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138 buffer.position(Internals.ltoi(offset - position));
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139 } else {
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140 position = offset;
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141 buffer = null;
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142 }
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143 }
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144
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145 @Override
420
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146 public void seek(int offset) {
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147 longSeek(offset);
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148 }
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149
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150 @Override
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151 public void skip(int bytes) throws IOException {
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152 assert bytes >= 0;
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153 if (buffer == null) {
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154 position += bytes;
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155 return;
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156 }
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157 if (buffer.remaining() > bytes) {
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158 buffer.position(buffer.position() + bytes);
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159 } else {
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160 position += buffer.position() + bytes;
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161 buffer = null;
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162 }
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163 }
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164
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165 private void fill() throws IOException {
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166 if (buffer != null) {
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167 position += buffer.position();
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168 }
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169 long left = size - position;
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170 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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171 }
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172
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173 @Override
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174 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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175 if (buffer == null || !buffer.hasRemaining()) {
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176 fill();
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177 }
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178 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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179 while (length > 0) {
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180 int tail = buffer.remaining();
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181 if (tail == 0) {
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182 throw new IOException();
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183 }
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184 if (tail >= length) {
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185 buffer.get(buf, offset, length);
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186 } else {
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187 buffer.get(buf, offset, tail);
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188 fill();
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189 }
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190 offset += tail;
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191 length -= tail;
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192 }
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193 }
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194
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195 @Override
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196 public byte readByte() throws IOException {
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197 if (buffer == null || !buffer.hasRemaining()) {
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198 fill();
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199 }
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200 if (buffer.hasRemaining()) {
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201 return buffer.get();
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202 }
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203 throw new IOException();
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204 }
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205
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206 @Override
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207 public void done() {
26
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208 buffer = null;
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209 if (fileChannel != null) {
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210 try {
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211 fileChannel.close();
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212 } catch (IOException ex) {
425
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diff changeset
213 logFacility.debug(getClass(), ex, null);
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214 }
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215 fileChannel = null;
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216 }
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217 }
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218 }
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219
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220 // (almost) regular file access - FileChannel and buffers.
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221 private static class FileAccess extends DataAccess {
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222 private FileChannel fileChannel;
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223 private ByteBuffer buffer;
420
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224 private long bufferStartInFile = 0; // offset of this.buffer in the file.
425
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225 private final long size;
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226 private final LogFacility logFacility;
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227
425
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228 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect, LogFacility log) {
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229 fileChannel = fc;
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230 size = channelSize;
425
48f993aa2f41 FIXMEs: exceptions, javadoc
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diff changeset
231 logFacility = log;
420
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diff changeset
232 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
10
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233 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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234 buffer.flip(); // or .limit(0) to indicate it's empty
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235 }
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236
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237 @Override
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238 public boolean isEmpty() {
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239 return bufferStartInFile + buffer.position() >= size;
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240 }
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241
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242 @Override
420
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diff changeset
243 public DataAccess reset() throws IOException {
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diff changeset
244 longSeek(0);
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245 return this;
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246 }
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247
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diff changeset
248 @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
249 public int length() {
420
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250 return Internals.ltoi(longLength());
51
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diff changeset
251 }
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252
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253 @Override
420
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254 public long longLength() {
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255 return size;
51
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diff changeset
256 }
420
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diff changeset
257
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diff changeset
258 @Override
420
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diff changeset
259 public void longSeek(long offset) throws IOException {
23
6f9aca1a97be Severe defect in buffer wrap on seek
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diff changeset
260 if (offset > size) {
404
31a719b9f95e Provide more detailed information on erroneous file operation
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diff changeset
261 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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262 }
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263 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
420
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diff changeset
264 // cast to int is safe, we've checked we fit into buffer
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diff changeset
265 buffer.position(Internals.ltoi(offset - bufferStartInFile));
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266 } else {
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267 // out of current buffer, invalidate it (force re-read)
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268 // XXX or ever re-read it right away?
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269 bufferStartInFile = offset;
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270 buffer.clear();
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271 buffer.limit(0); // or .flip() to indicate we switch to reading
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272 fileChannel.position(offset);
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273 }
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274 }
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275
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276 @Override
420
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diff changeset
277 public void seek(int offset) throws IOException {
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diff changeset
278 longSeek(offset);
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279 }
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diff changeset
280
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diff changeset
281 @Override
10
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282 public void skip(int bytes) throws IOException {
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283 final int newPos = buffer.position() + bytes;
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284 if (newPos >= 0 && newPos < buffer.limit()) {
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285 // no need to move file pointer, just rewind/seek buffer
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286 buffer.position(newPos);
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diff changeset
287 } else {
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diff changeset
288 //
420
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diff changeset
289 longSeek(bufferStartInFile + newPos);
10
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290 }
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291 }
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292
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diff changeset
293 private boolean fill() throws IOException {
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diff changeset
294 if (!buffer.hasRemaining()) {
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295 bufferStartInFile += buffer.limit();
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296 buffer.clear();
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diff changeset
297 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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diff changeset
298 fileChannel.read(buffer);
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diff changeset
299 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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diff changeset
300 }
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diff changeset
301 buffer.flip();
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diff changeset
302 }
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diff changeset
303 return buffer.hasRemaining();
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parents:
diff changeset
304 }
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parents:
diff changeset
305
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
306 @Override
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diff changeset
307 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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parents: 23
diff changeset
308 if (!buffer.hasRemaining()) {
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
309 fill();
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
310 }
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parents: 23
diff changeset
311 while (length > 0) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
312 int tail = buffer.remaining();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
313 if (tail == 0) {
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
314 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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parents: 23
diff changeset
315 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
316 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
317 buffer.get(buf, offset, length);
10
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diff changeset
318 } else {
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
319 buffer.get(buf, offset, tail);
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
320 fill();
10
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diff changeset
321 }
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
322 offset += tail;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
323 length -= tail;
10
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parents:
diff changeset
324 }
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parents:
diff changeset
325 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
326
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
327 @Override
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parents:
diff changeset
328 public byte readByte() throws IOException {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
329 if (buffer.hasRemaining()) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
330 return buffer.get();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
331 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
332 if (fill()) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
333 return buffer.get();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
334 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
335 throw new IOException();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
336 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
337
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
338 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
339 public void done() {
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diff changeset
340 if (buffer != null) {
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diff changeset
341 buffer = null;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
342 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
343 if (fileChannel != null) {
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parents:
diff changeset
344 try {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
345 fileChannel.close();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
346 } catch (IOException ex) {
425
48f993aa2f41 FIXMEs: exceptions, javadoc
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parents: 420
diff changeset
347 logFacility.debug(getClass(), ex, null);
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
348 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
349 fileChannel = null;
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parents:
diff changeset
350 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
351 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
352 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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