Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 315:8952f89be195
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author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Wed, 28 Sep 2011 12:18:21 +0200 |
parents | 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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18 |
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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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25 |
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26 import org.tmatesoft.hg.core.HgBadStateException; |
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27 import org.tmatesoft.hg.core.SessionContext; |
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28 |
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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 private final int mapioMagicBoundary; |
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37 private final int bufferSize; |
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38 private final SessionContext context; |
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39 |
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40 public DataAccessProvider(SessionContext ctx) { |
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41 this(ctx, 100 * 1024, 8 * 1024); |
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42 } |
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43 |
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44 public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize) { |
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45 context = ctx; |
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46 mapioMagicBoundary = mapioBoundary; |
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47 bufferSize = regularBufferSize; |
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48 } |
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49 |
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50 public DataAccess create(File f) { |
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51 if (!f.exists()) { |
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52 return new DataAccess(); |
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53 } |
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54 try { |
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55 FileChannel fc = new FileInputStream(f).getChannel(); |
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56 int flen = (int) fc.size(); |
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57 if (fc.size() - flen != 0) { |
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58 throw new HgBadStateException("Files greater than 2Gb are not yet supported"); |
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59 } |
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60 if (flen > mapioMagicBoundary) { |
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61 // TESTS: bufLen of 1024 was used to test MemMapFileAccess |
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62 return new MemoryMapFileAccess(fc, flen, mapioMagicBoundary); |
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63 } else { |
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64 // XXX once implementation is more or less stable, |
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65 // may want to try ByteBuffer.allocateDirect() to see |
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66 // if there's any performance gain. |
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67 boolean useDirectBuffer = false; |
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68 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize |
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69 return new FileAccess(fc, flen, bufferSize, useDirectBuffer); |
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70 } |
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71 } catch (IOException ex) { |
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72 // unlikely to happen, we've made sure file exists. |
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73 context.getLog().error(getClass(), ex, null); |
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74 } |
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75 return new DataAccess(); // non-null, empty. |
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76 } |
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77 |
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78 // DOESN'T WORK YET |
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79 private static class MemoryMapFileAccess extends DataAccess { |
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80 private FileChannel fileChannel; |
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81 private final int size; |
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82 private long position = 0; // always points to buffer's absolute position in the file |
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83 private final int memBufferSize; |
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84 private MappedByteBuffer buffer; |
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85 |
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86 public MemoryMapFileAccess(FileChannel fc, int channelSize, int /*long?*/ bufferSize) { |
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87 fileChannel = fc; |
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88 size = channelSize; |
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89 memBufferSize = bufferSize; |
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90 } |
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91 |
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92 @Override |
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93 public boolean isEmpty() { |
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94 return position + (buffer == null ? 0 : buffer.position()) >= size; |
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95 } |
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96 |
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97 @Override |
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98 public int length() { |
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99 return size; |
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100 } |
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101 |
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102 @Override |
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103 public DataAccess reset() throws IOException { |
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104 seek(0); |
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105 return this; |
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106 } |
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107 |
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108 @Override |
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109 public void seek(int offset) { |
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110 assert offset >= 0; |
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111 // offset may not necessarily be further than current position in the file (e.g. rewind) |
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112 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) { |
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113 buffer.position((int) (offset - position)); |
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114 } else { |
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115 position = offset; |
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116 buffer = null; |
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117 } |
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118 } |
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119 |
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120 @Override |
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121 public void skip(int bytes) throws IOException { |
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122 assert bytes >= 0; |
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123 if (buffer == null) { |
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124 position += bytes; |
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125 return; |
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126 } |
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127 if (buffer.remaining() > bytes) { |
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128 buffer.position(buffer.position() + bytes); |
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129 } else { |
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130 position += buffer.position() + bytes; |
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131 buffer = null; |
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132 } |
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133 } |
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134 |
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135 private void fill() throws IOException { |
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136 if (buffer != null) { |
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137 position += buffer.position(); |
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138 } |
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139 long left = size - position; |
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140 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize); |
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141 } |
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142 |
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143 @Override |
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144 public void readBytes(byte[] buf, int offset, int length) throws IOException { |
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145 if (buffer == null || !buffer.hasRemaining()) { |
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146 fill(); |
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147 } |
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148 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away |
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149 while (length > 0) { |
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150 int tail = buffer.remaining(); |
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151 if (tail == 0) { |
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152 throw new IOException(); |
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153 } |
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154 if (tail >= length) { |
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155 buffer.get(buf, offset, length); |
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156 } else { |
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157 buffer.get(buf, offset, tail); |
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158 fill(); |
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159 } |
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160 offset += tail; |
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161 length -= tail; |
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162 } |
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163 } |
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164 |
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165 @Override |
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166 public byte readByte() throws IOException { |
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167 if (buffer == null || !buffer.hasRemaining()) { |
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168 fill(); |
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169 } |
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170 if (buffer.hasRemaining()) { |
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171 return buffer.get(); |
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172 } |
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173 throw new IOException(); |
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174 } |
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175 |
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176 @Override |
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177 public void done() { |
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178 buffer = null; |
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179 if (fileChannel != null) { |
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180 try { |
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181 fileChannel.close(); |
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182 } catch (IOException ex) { |
295
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183 StreamLogFacility.newDefault().debug(getClass(), ex, null); |
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184 } |
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185 fileChannel = null; |
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186 } |
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187 } |
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188 } |
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189 |
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190 // (almost) regular file access - FileChannel and buffers. |
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191 private static class FileAccess extends DataAccess { |
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192 private FileChannel fileChannel; |
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193 private final int size; |
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194 private ByteBuffer buffer; |
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195 private int bufferStartInFile = 0; // offset of this.buffer in the file. |
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196 |
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197 public FileAccess(FileChannel fc, int channelSize, int bufferSizeHint, boolean useDirect) { |
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198 fileChannel = fc; |
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199 size = channelSize; |
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200 final int capacity = size < bufferSizeHint ? size : bufferSizeHint; |
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201 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity); |
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202 buffer.flip(); // or .limit(0) to indicate it's empty |
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203 } |
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204 |
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205 @Override |
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206 public boolean isEmpty() { |
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207 return bufferStartInFile + buffer.position() >= size; |
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208 } |
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209 |
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210 @Override |
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211 public int length() { |
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212 return size; |
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213 } |
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214 |
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215 @Override |
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216 public DataAccess reset() throws IOException { |
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217 seek(0); |
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218 return this; |
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219 } |
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220 |
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221 @Override |
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222 public void seek(int offset) throws IOException { |
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223 if (offset > size) { |
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224 throw new IllegalArgumentException(); |
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225 } |
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226 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) { |
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227 buffer.position((int) (offset - bufferStartInFile)); |
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228 } else { |
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229 // out of current buffer, invalidate it (force re-read) |
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230 // XXX or ever re-read it right away? |
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231 bufferStartInFile = offset; |
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232 buffer.clear(); |
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233 buffer.limit(0); // or .flip() to indicate we switch to reading |
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234 fileChannel.position(offset); |
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235 } |
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236 } |
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237 |
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238 @Override |
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239 public void skip(int bytes) throws IOException { |
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240 final int newPos = buffer.position() + bytes; |
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241 if (newPos >= 0 && newPos < buffer.limit()) { |
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242 // no need to move file pointer, just rewind/seek buffer |
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243 buffer.position(newPos); |
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244 } else { |
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245 // |
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246 seek(bufferStartInFile + newPos); |
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247 } |
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248 } |
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249 |
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250 private boolean fill() throws IOException { |
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251 if (!buffer.hasRemaining()) { |
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252 bufferStartInFile += buffer.limit(); |
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253 buffer.clear(); |
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254 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1 |
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255 fileChannel.read(buffer); |
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256 // may return -1 when EOF, but empty will reflect this, hence no explicit support here |
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257 } |
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258 buffer.flip(); |
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259 } |
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260 return buffer.hasRemaining(); |
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261 } |
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262 |
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263 @Override |
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264 public void readBytes(byte[] buf, int offset, int length) throws IOException { |
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265 if (!buffer.hasRemaining()) { |
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266 fill(); |
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267 } |
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268 while (length > 0) { |
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269 int tail = buffer.remaining(); |
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270 if (tail == 0) { |
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271 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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272 } |
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273 if (tail >= length) { |
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274 buffer.get(buf, offset, length); |
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275 } else { |
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276 buffer.get(buf, offset, tail); |
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277 fill(); |
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278 } |
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279 offset += tail; |
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280 length -= tail; |
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281 } |
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282 } |
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283 |
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284 @Override |
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285 public byte readByte() throws IOException { |
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286 if (buffer.hasRemaining()) { |
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287 return buffer.get(); |
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288 } |
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289 if (fill()) { |
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290 return buffer.get(); |
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291 } |
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292 throw new IOException(); |
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293 } |
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294 |
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295 @Override |
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296 public void done() { |
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297 if (buffer != null) { |
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298 buffer = null; |
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299 } |
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300 if (fileChannel != null) { |
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301 try { |
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302 fileChannel.close(); |
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303 } catch (IOException ex) { |
295
981f9f50bb6c
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304 StreamLogFacility.newDefault().debug(getClass(), ex, null); |
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305 } |
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306 fileChannel = null; |
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307 } |
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308 } |
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309 } |
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310 } |