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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 158:b413b16d10a5

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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
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 09 Mar 2011 13:16:37 +0100
parents d5268ca7715b
children 981f9f50bb6c
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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.HgBadStateException;
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27
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28 /**
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 public class DataAccessProvider {
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34
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35 private final int mapioMagicBoundary;
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36 private final int bufferSize;
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38 public DataAccessProvider() {
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39 this(100 * 1024, 8 * 1024);
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40 }
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41
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42 public DataAccessProvider(int mapioBoundary, int regularBufferSize) {
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43 mapioMagicBoundary = mapioBoundary;
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44 bufferSize = regularBufferSize;
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45 }
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46
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47 public DataAccess create(File f) {
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48 if (!f.exists()) {
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49 return new DataAccess();
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50 }
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51 try {
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52 FileChannel fc = new FileInputStream(f).getChannel();
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53 int flen = (int) fc.size();
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54 if (fc.size() - flen != 0) {
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55 throw new HgBadStateException("Files greater than 2Gb are not yet supported");
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56 }
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57 if (flen > mapioMagicBoundary) {
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58 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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59 return new MemoryMapFileAccess(fc, flen, mapioMagicBoundary);
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60 } else {
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61 // XXX once implementation is more or less stable,
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62 // may want to try ByteBuffer.allocateDirect() to see
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63 // if there's any performance gain.
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64 boolean useDirectBuffer = false;
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65 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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66 return new FileAccess(fc, flen, bufferSize, useDirectBuffer);
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67 }
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68 } catch (IOException ex) {
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69 // unlikely to happen, we've made sure file exists.
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70 ex.printStackTrace(); // FIXME log error
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71 }
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72 return new DataAccess(); // non-null, empty.
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73 }
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75 // DOESN'T WORK YET
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76 private static class MemoryMapFileAccess extends DataAccess {
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77 private FileChannel fileChannel;
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78 private final int size;
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79 private long position = 0; // always points to buffer's absolute position in the file
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80 private final int memBufferSize;
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81 private MappedByteBuffer buffer;
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82
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83 public MemoryMapFileAccess(FileChannel fc, int channelSize, int /*long?*/ bufferSize) {
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84 fileChannel = fc;
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85 size = channelSize;
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86 memBufferSize = bufferSize;
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87 }
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89 @Override
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90 public boolean isEmpty() {
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91 return position + (buffer == null ? 0 : buffer.position()) >= size;
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92 }
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94 @Override
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95 public int length() {
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96 return size;
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97 }
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98
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99 @Override
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100 public DataAccess reset() throws IOException {
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101 seek(0);
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102 return this;
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103 }
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105 @Override
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106 public void seek(int offset) {
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107 assert offset >= 0;
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108 // offset may not necessarily be further than current position in the file (e.g. rewind)
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109 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
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110 buffer.position((int) (offset - position));
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111 } else {
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112 position = offset;
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113 buffer = null;
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114 }
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115 }
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116
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117 @Override
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118 public void skip(int bytes) throws IOException {
26
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119 assert bytes >= 0;
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120 if (buffer == null) {
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121 position += bytes;
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122 return;
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123 }
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124 if (buffer.remaining() > bytes) {
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125 buffer.position(buffer.position() + bytes);
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126 } else {
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127 position += buffer.position() + bytes;
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128 buffer = null;
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129 }
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130 }
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131
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132 private void fill() throws IOException {
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133 if (buffer != null) {
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134 position += buffer.position();
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135 }
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136 long left = size - position;
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137 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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138 }
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139
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140 @Override
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141 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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142 if (buffer == null || !buffer.hasRemaining()) {
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143 fill();
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144 }
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145 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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146 while (length > 0) {
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147 int tail = buffer.remaining();
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148 if (tail == 0) {
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149 throw new IOException();
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150 }
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151 if (tail >= length) {
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152 buffer.get(buf, offset, length);
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153 } else {
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154 buffer.get(buf, offset, tail);
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155 fill();
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156 }
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157 offset += tail;
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158 length -= tail;
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159 }
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160 }
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161
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162 @Override
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163 public byte readByte() throws IOException {
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164 if (buffer == null || !buffer.hasRemaining()) {
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165 fill();
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166 }
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167 if (buffer.hasRemaining()) {
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168 return buffer.get();
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169 }
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170 throw new IOException();
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171 }
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172
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173 @Override
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174 public void done() {
26
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175 buffer = null;
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176 if (fileChannel != null) {
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177 try {
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178 fileChannel.close();
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179 } catch (IOException ex) {
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180 ex.printStackTrace(); // log debug
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181 }
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182 fileChannel = null;
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183 }
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184 }
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185 }
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186
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187 // (almost) regular file access - FileChannel and buffers.
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188 private static class FileAccess extends DataAccess {
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189 private FileChannel fileChannel;
158
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190 private final int size;
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191 private ByteBuffer buffer;
158
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192 private int bufferStartInFile = 0; // offset of this.buffer in the file.
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193
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194 public FileAccess(FileChannel fc, int channelSize, int bufferSizeHint, boolean useDirect) {
10
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195 fileChannel = fc;
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196 size = channelSize;
158
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197 final int capacity = size < bufferSizeHint ? size : bufferSizeHint;
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198 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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199 buffer.flip(); // or .limit(0) to indicate it's empty
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200 }
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201
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202 @Override
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203 public boolean isEmpty() {
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204 return bufferStartInFile + buffer.position() >= size;
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205 }
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206
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207 @Override
158
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208 public int length() {
51
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209 return size;
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210 }
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211
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212 @Override
157
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213 public DataAccess reset() throws IOException {
51
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214 seek(0);
157
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diff changeset
215 return this;
51
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216 }
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217
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218 @Override
158
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219 public void seek(int offset) throws IOException {
23
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220 if (offset > size) {
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221 throw new IllegalArgumentException();
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222 }
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223 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
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224 buffer.position((int) (offset - bufferStartInFile));
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225 } else {
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226 // out of current buffer, invalidate it (force re-read)
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227 // XXX or ever re-read it right away?
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228 bufferStartInFile = offset;
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229 buffer.clear();
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230 buffer.limit(0); // or .flip() to indicate we switch to reading
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231 fileChannel.position(offset);
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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 void skip(int bytes) throws IOException {
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237 final int newPos = buffer.position() + bytes;
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238 if (newPos >= 0 && newPos < buffer.limit()) {
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239 // no need to move file pointer, just rewind/seek buffer
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240 buffer.position(newPos);
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241 } else {
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242 //
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243 seek(bufferStartInFile + newPos);
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244 }
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245 }
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246
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247 private boolean fill() throws IOException {
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248 if (!buffer.hasRemaining()) {
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249 bufferStartInFile += buffer.limit();
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250 buffer.clear();
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251 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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252 fileChannel.read(buffer);
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253 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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254 }
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255 buffer.flip();
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256 }
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257 return buffer.hasRemaining();
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258 }
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259
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260 @Override
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261 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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262 if (!buffer.hasRemaining()) {
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263 fill();
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264 }
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265 while (length > 0) {
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266 int tail = buffer.remaining();
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267 if (tail == 0) {
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268 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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269 }
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270 if (tail >= length) {
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271 buffer.get(buf, offset, length);
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272 } else {
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273 buffer.get(buf, offset, tail);
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274 fill();
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275 }
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276 offset += tail;
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277 length -= tail;
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278 }
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279 }
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280
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281 @Override
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282 public byte readByte() throws IOException {
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283 if (buffer.hasRemaining()) {
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284 return buffer.get();
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285 }
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286 if (fill()) {
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287 return buffer.get();
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288 }
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289 throw new IOException();
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290 }
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291
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292 @Override
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293 public void done() {
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294 if (buffer != null) {
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295 buffer = null;
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296 }
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297 if (fileChannel != null) {
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298 try {
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299 fileChannel.close();
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300 } catch (IOException ex) {
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301 ex.printStackTrace(); // log debug
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302 }
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303 fileChannel = null;
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304 }
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305 }
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306 }
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307 }