Mercurial > hg4j

annotate src/com/tmate/hgkit/fs/DataAccessProvider.java @ 26:71a9ba42cee8

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Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 09 Jan 2011 15:59:54 +0100
parents 6f9aca1a97be
children b0a15cefdfd6
rev   line source
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1 /*
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2 * Copyright (c) 2010, 2011 Artem Tikhomirov
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3 */
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4 package com.tmate.hgkit.fs;
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6 import java.io.File;
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7 import java.io.FileInputStream;
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8 import java.io.IOException;
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9 import java.nio.ByteBuffer;
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10 import java.nio.MappedByteBuffer;
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11 import java.nio.channels.FileChannel;
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13 /**
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14 *
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15 * @author artem
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16 */
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17 public class DataAccessProvider {
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19 private final int mapioMagicBoundary;
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20 private final int bufferSize;
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22 public DataAccessProvider() {
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23 mapioMagicBoundary = 100 * 1024;
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24 bufferSize = 8 * 1024;
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25 }
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27 public DataAccess create(File f) {
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28 if (!f.exists()) {
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29 return new DataAccess();
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30 }
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31 try {
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32 FileChannel fc = new FileInputStream(f).getChannel();
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33 if (fc.size() > mapioMagicBoundary) {
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34 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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35 return new MemoryMapFileAccess(fc, fc.size(), mapioMagicBoundary);
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36 } else {
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37 // XXX once implementation is more or less stable,
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38 // may want to try ByteBuffer.allocateDirect() to see
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39 // if there's any performance gain.
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40 boolean useDirectBuffer = false;
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41 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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42 return new FileAccess(fc, fc.size(), bufferSize, useDirectBuffer);
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43 }
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44 } catch (IOException ex) {
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45 // unlikely to happen, we've made sure file exists.
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46 ex.printStackTrace(); // FIXME log error
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47 }
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48 return new DataAccess(); // non-null, empty.
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49 }
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50
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51 // DOESN'T WORK YET
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52 private static class MemoryMapFileAccess extends DataAccess {
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53 private FileChannel fileChannel;
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54 private final long size;
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55 private long position = 0; // always points to buffer's absolute position in the file
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56 private final int memBufferSize;
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57 private MappedByteBuffer buffer;
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58
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59 public MemoryMapFileAccess(FileChannel fc, long channelSize, int /*long?*/ bufferSize) {
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60 fileChannel = fc;
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61 size = channelSize;
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62 memBufferSize = bufferSize;
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63 }
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64
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65 @Override
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66 public boolean isEmpty() {
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67 return position + (buffer == null ? 0 : buffer.position()) >= size;
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68 }
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69
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70 @Override
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71 public void seek(long offset) {
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72 assert offset >= 0;
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73 // offset may not necessarily be further than current position in the file (e.g. rewind)
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74 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
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75 buffer.position((int) (offset - position));
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76 } else {
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77 position = offset;
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78 buffer = null;
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79 }
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80 }
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81
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82 @Override
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83 public void skip(int bytes) throws IOException {
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84 assert bytes >= 0;
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85 if (buffer == null) {
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86 position += bytes;
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87 return;
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88 }
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89 if (buffer.remaining() > bytes) {
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90 buffer.position(buffer.position() + bytes);
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91 } else {
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92 position += buffer.position() + bytes;
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93 buffer = null;
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94 }
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95 }
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96
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97 private void fill() throws IOException {
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98 if (buffer != null) {
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99 position += buffer.position();
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100 }
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101 long left = size - position;
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102 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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103 }
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104
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105 @Override
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106 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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107 if (buffer == null || !buffer.hasRemaining()) {
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108 fill();
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109 }
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110 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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111 while (length > 0) {
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112 int tail = buffer.remaining();
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113 if (tail == 0) {
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114 throw new IOException();
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115 }
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116 if (tail >= length) {
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117 buffer.get(buf, offset, length);
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118 } else {
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119 buffer.get(buf, offset, tail);
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120 fill();
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121 }
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122 offset += tail;
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123 length -= tail;
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124 }
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125 }
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126
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127 @Override
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128 public byte readByte() throws IOException {
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129 if (buffer == null || !buffer.hasRemaining()) {
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130 fill();
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131 }
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132 if (buffer.hasRemaining()) {
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133 return buffer.get();
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134 }
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135 throw new IOException();
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136 }
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137
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138 @Override
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139 public void done() {
26
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140 buffer = null;
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141 if (fileChannel != null) {
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142 try {
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143 fileChannel.close();
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144 } catch (IOException ex) {
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145 ex.printStackTrace(); // log debug
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146 }
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147 fileChannel = null;
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148 }
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149 }
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150 }
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151
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152 // (almost) regular file access - FileChannel and buffers.
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153 private static class FileAccess extends DataAccess {
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154 private FileChannel fileChannel;
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155 private final long size;
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156 private ByteBuffer buffer;
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157 private long bufferStartInFile = 0; // offset of this.buffer in the file.
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158
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159 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect) {
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160 fileChannel = fc;
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161 size = channelSize;
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162 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
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163 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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164 buffer.flip(); // or .limit(0) to indicate it's empty
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165 }
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166
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167 @Override
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168 public boolean isEmpty() {
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169 return bufferStartInFile + buffer.position() >= size;
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170 }
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171
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172 @Override
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173 public void seek(long offset) throws IOException {
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174 if (offset > size) {
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175 throw new IllegalArgumentException();
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176 }
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177 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
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178 buffer.position((int) (offset - bufferStartInFile));
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179 } else {
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180 // out of current buffer, invalidate it (force re-read)
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181 // XXX or ever re-read it right away?
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182 bufferStartInFile = offset;
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183 buffer.clear();
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184 buffer.limit(0); // or .flip() to indicate we switch to reading
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185 fileChannel.position(offset);
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186 }
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187 }
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188
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189 @Override
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190 public void skip(int bytes) throws IOException {
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191 final int newPos = buffer.position() + bytes;
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192 if (newPos >= 0 && newPos < buffer.limit()) {
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193 // no need to move file pointer, just rewind/seek buffer
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194 buffer.position(newPos);
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195 } else {
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196 //
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197 seek(bufferStartInFile + newPos);
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198 }
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199 }
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200
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201 private boolean fill() throws IOException {
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202 if (!buffer.hasRemaining()) {
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203 bufferStartInFile += buffer.limit();
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204 buffer.clear();
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205 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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206 fileChannel.read(buffer);
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207 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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208 }
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209 buffer.flip();
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210 }
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211 return buffer.hasRemaining();
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212 }
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213
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214 @Override
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215 public void readBytes(byte[] buf, int offset, int length) throws IOException {
26
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216 if (!buffer.hasRemaining()) {
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217 fill();
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218 }
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219 while (length > 0) {
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220 int tail = buffer.remaining();
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221 if (tail == 0) {
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222 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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223 }
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224 if (tail >= length) {
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225 buffer.get(buf, offset, length);
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226 } else {
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227 buffer.get(buf, offset, tail);
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228 fill();
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229 }
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230 offset += tail;
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231 length -= tail;
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232 }
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233 }
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234
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235 @Override
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236 public byte readByte() throws IOException {
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237 if (buffer.hasRemaining()) {
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238 return buffer.get();
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239 }
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240 if (fill()) {
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241 return buffer.get();
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242 }
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243 throw new IOException();
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244 }
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245
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246 @Override
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247 public void done() {
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248 if (buffer != null) {
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249 buffer = null;
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250 }
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251 if (fileChannel != null) {
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252 try {
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253 fileChannel.close();
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254 } catch (IOException ex) {
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255 ex.printStackTrace(); // log debug
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256 }
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257 fileChannel = null;
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258 }
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259 }
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260 }
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261 }