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annotate src/com/tmate/hgkit/fs/DataAccessProvider.java @ 52:30bd38978846

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brief explanation of patch record
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 16 Jan 2011 01:30:18 +0100
parents b0a15cefdfd6
children 9429c7bd1920
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 this(100 * 1024, 8 * 1024);
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24 }
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25
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26 public DataAccessProvider(int mapioBoundary, int regularBufferSize) {
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27 mapioMagicBoundary = mapioBoundary;
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28 bufferSize = regularBufferSize;
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29 }
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31 public DataAccess create(File f) {
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32 if (!f.exists()) {
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33 return new DataAccess();
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34 }
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35 try {
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36 FileChannel fc = new FileInputStream(f).getChannel();
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37 if (fc.size() > mapioMagicBoundary) {
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38 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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39 return new MemoryMapFileAccess(fc, fc.size(), mapioMagicBoundary);
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40 } else {
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41 // XXX once implementation is more or less stable,
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42 // may want to try ByteBuffer.allocateDirect() to see
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43 // if there's any performance gain.
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44 boolean useDirectBuffer = false;
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45 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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46 return new FileAccess(fc, fc.size(), bufferSize, useDirectBuffer);
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47 }
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48 } catch (IOException ex) {
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49 // unlikely to happen, we've made sure file exists.
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50 ex.printStackTrace(); // FIXME log error
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51 }
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52 return new DataAccess(); // non-null, empty.
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53 }
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55 // DOESN'T WORK YET
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56 private static class MemoryMapFileAccess extends DataAccess {
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57 private FileChannel fileChannel;
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58 private final long size;
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59 private long position = 0; // always points to buffer's absolute position in the file
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60 private final int memBufferSize;
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61 private MappedByteBuffer buffer;
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62
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63 public MemoryMapFileAccess(FileChannel fc, long channelSize, int /*long?*/ bufferSize) {
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64 fileChannel = fc;
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65 size = channelSize;
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66 memBufferSize = bufferSize;
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67 }
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68
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69 @Override
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70 public boolean isEmpty() {
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71 return position + (buffer == null ? 0 : buffer.position()) >= size;
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72 }
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73
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74 @Override
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75 public void seek(long offset) {
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76 assert offset >= 0;
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77 // offset may not necessarily be further than current position in the file (e.g. rewind)
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78 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
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79 buffer.position((int) (offset - position));
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80 } else {
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81 position = offset;
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82 buffer = null;
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83 }
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84 }
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85
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86 @Override
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87 public void skip(int bytes) throws IOException {
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88 assert bytes >= 0;
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89 if (buffer == null) {
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90 position += bytes;
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91 return;
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92 }
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93 if (buffer.remaining() > bytes) {
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94 buffer.position(buffer.position() + bytes);
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95 } else {
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96 position += buffer.position() + bytes;
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97 buffer = null;
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98 }
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99 }
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100
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101 private void fill() throws IOException {
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102 if (buffer != null) {
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103 position += buffer.position();
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104 }
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105 long left = size - position;
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106 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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107 }
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108
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109 @Override
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110 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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111 if (buffer == null || !buffer.hasRemaining()) {
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112 fill();
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113 }
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114 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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115 while (length > 0) {
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116 int tail = buffer.remaining();
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117 if (tail == 0) {
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118 throw new IOException();
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119 }
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120 if (tail >= length) {
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121 buffer.get(buf, offset, length);
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122 } else {
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123 buffer.get(buf, offset, tail);
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124 fill();
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125 }
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126 offset += tail;
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127 length -= tail;
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128 }
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129 }
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130
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131 @Override
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132 public byte readByte() throws IOException {
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133 if (buffer == null || !buffer.hasRemaining()) {
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134 fill();
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135 }
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136 if (buffer.hasRemaining()) {
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137 return buffer.get();
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138 }
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139 throw new IOException();
10
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140 }
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141
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142 @Override
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143 public void done() {
26
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144 buffer = null;
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145 if (fileChannel != null) {
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146 try {
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147 fileChannel.close();
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148 } catch (IOException ex) {
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149 ex.printStackTrace(); // log debug
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150 }
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151 fileChannel = null;
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152 }
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153 }
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154 }
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155
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156 // (almost) regular file access - FileChannel and buffers.
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157 private static class FileAccess extends DataAccess {
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158 private FileChannel fileChannel;
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159 private final long size;
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160 private ByteBuffer buffer;
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161 private long bufferStartInFile = 0; // offset of this.buffer in the file.
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162
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163 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect) {
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164 fileChannel = fc;
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165 size = channelSize;
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166 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
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167 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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168 buffer.flip(); // or .limit(0) to indicate it's empty
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169 }
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170
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171 @Override
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172 public boolean isEmpty() {
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173 return bufferStartInFile + buffer.position() >= size;
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174 }
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175
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176 @Override
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177 public void seek(long offset) throws IOException {
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178 if (offset > size) {
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179 throw new IllegalArgumentException();
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180 }
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181 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
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182 buffer.position((int) (offset - bufferStartInFile));
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183 } else {
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184 // out of current buffer, invalidate it (force re-read)
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185 // XXX or ever re-read it right away?
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186 bufferStartInFile = offset;
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187 buffer.clear();
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188 buffer.limit(0); // or .flip() to indicate we switch to reading
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189 fileChannel.position(offset);
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190 }
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191 }
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192
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193 @Override
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194 public void skip(int bytes) throws IOException {
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195 final int newPos = buffer.position() + bytes;
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196 if (newPos >= 0 && newPos < buffer.limit()) {
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197 // no need to move file pointer, just rewind/seek buffer
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198 buffer.position(newPos);
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199 } else {
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200 //
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201 seek(bufferStartInFile + newPos);
10
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202 }
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203 }
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204
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205 private boolean fill() throws IOException {
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206 if (!buffer.hasRemaining()) {
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207 bufferStartInFile += buffer.limit();
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208 buffer.clear();
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209 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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210 fileChannel.read(buffer);
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211 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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212 }
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213 buffer.flip();
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214 }
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215 return buffer.hasRemaining();
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216 }
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217
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218 @Override
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219 public void readBytes(byte[] buf, int offset, int length) throws IOException {
26
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220 if (!buffer.hasRemaining()) {
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221 fill();
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222 }
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diff changeset
223 while (length > 0) {
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diff changeset
224 int tail = buffer.remaining();
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225 if (tail == 0) {
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226 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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227 }
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228 if (tail >= length) {
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229 buffer.get(buf, offset, length);
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230 } else {
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231 buffer.get(buf, offset, tail);
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232 fill();
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233 }
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234 offset += tail;
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235 length -= tail;
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236 }
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237 }
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238
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239 @Override
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240 public byte readByte() throws IOException {
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241 if (buffer.hasRemaining()) {
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242 return buffer.get();
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243 }
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244 if (fill()) {
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245 return buffer.get();
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246 }
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247 throw new IOException();
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248 }
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249
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250 @Override
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251 public void done() {
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252 if (buffer != null) {
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253 buffer = null;
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254 }
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255 if (fileChannel != null) {
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256 try {
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257 fileChannel.close();
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258 } catch (IOException ex) {
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259 ex.printStackTrace(); // log debug
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260 }
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261 fileChannel = null;
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262 }
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263 }
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264 }
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265 }