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annotate src/org/eclipse/jetty/io/nio/RandomAccessFileBuffer.java @ 954:a021c4c9c244

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author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 13 Oct 2016 00:54:10 -0600
parents 3428c60d7cfc
children
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.io.nio;
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20
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21 import java.io.File;
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22 import java.io.FileNotFoundException;
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23 import java.io.IOException;
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24 import java.io.RandomAccessFile;
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25 import java.nio.channels.FileChannel;
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26 import java.nio.channels.WritableByteChannel;
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27
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28 import org.eclipse.jetty.io.AbstractBuffer;
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29 import org.eclipse.jetty.io.Buffer;
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30
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31 public class RandomAccessFileBuffer extends AbstractBuffer implements Buffer
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32 {
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33 final RandomAccessFile _file;
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34 final FileChannel _channel;
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35 final int _capacity;
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36
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37 public RandomAccessFileBuffer(File file)
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38 throws FileNotFoundException
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39 {
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40 super(READWRITE,true);
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41 assert file.length()<=Integer.MAX_VALUE;
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42 _file = new RandomAccessFile(file,"rw");
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43 _channel=_file.getChannel();
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44 _capacity=Integer.MAX_VALUE;
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45 setGetIndex(0);
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46 setPutIndex((int)file.length());
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47 }
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48
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49 public RandomAccessFileBuffer(File file,int capacity)
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50 throws FileNotFoundException
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51 {
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52 super(READWRITE,true);
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53 assert capacity>=file.length();
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54 assert file.length()<=Integer.MAX_VALUE;
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55 _capacity=capacity;
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56 _file = new RandomAccessFile(file,"rw");
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57 _channel=_file.getChannel();
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58 setGetIndex(0);
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59 setPutIndex((int)file.length());
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60 }
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61
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62 public RandomAccessFileBuffer(File file,int capacity,int access)
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63 throws FileNotFoundException
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64 {
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65 super(access,true);
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66 assert capacity>=file.length();
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67 assert file.length()<=Integer.MAX_VALUE;
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68 _capacity=capacity;
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69 _file = new RandomAccessFile(file,access==READWRITE?"rw":"r");
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70 _channel=_file.getChannel();
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71 setGetIndex(0);
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72 setPutIndex((int)file.length());
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73 }
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74
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75 public byte[] array()
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76 {
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77 return null;
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78 }
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79
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80 public int capacity()
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81 {
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82 return _capacity;
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83 }
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84
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85 @Override
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86 public void clear()
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87 {
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88 try
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89 {
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90 synchronized (_file)
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91 {
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92 super.clear();
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93 _file.setLength(0);
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94 }
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95 }
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96 catch(Exception e)
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97 {
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98 throw new RuntimeException(e);
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99 }
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100 }
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101
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102
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103 @Override
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104 public byte peek()
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105 {
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106 synchronized (_file)
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107 {
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108 try
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109 {
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110 if (_get!=_file.getFilePointer())
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111 _file.seek(_get);
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112 return _file.readByte();
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113 }
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114 catch(Exception e)
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115 {
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116 throw new RuntimeException(e);
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117 }
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118 }
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119 }
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120
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121 public byte peek(int index)
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122 {
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123 synchronized (_file)
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124 {
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125 try
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126 {
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127 _file.seek(index);
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128 return _file.readByte();
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129 }
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130 catch(Exception e)
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131 {
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132 throw new RuntimeException(e);
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133 }
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134 }
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135 }
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136
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137 public int peek(int index, byte[] b, int offset, int length)
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138 {
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139 synchronized (_file)
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140 {
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141 try
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142 {
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143 _file.seek(index);
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144 return _file.read(b,offset,length);
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145 }
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146 catch(Exception e)
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147 {
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148 throw new RuntimeException(e);
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149 }
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150 }
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151 }
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152
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153 public void poke(int index, byte b)
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154 {
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155 synchronized (_file)
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156 {
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157 try
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158 {
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159 _file.seek(index);
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160 _file.writeByte(b);
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161 }
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162 catch(Exception e)
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163 {
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164 throw new RuntimeException(e);
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165 }
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166 }
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167 }
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168
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169 @Override
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170 public int poke(int index, byte[] b, int offset, int length)
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171 {
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172 synchronized (_file)
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173 {
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174 try
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175 {
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176 _file.seek(index);
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177 _file.write(b,offset,length);
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178 return length;
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179 }
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180 catch(Exception e)
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181 {
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182 throw new RuntimeException(e);
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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 public int writeTo(WritableByteChannel channel,int index, int length)
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188 throws IOException
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189 {
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190 synchronized (_file)
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191 {
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192 return (int)_channel.transferTo(index,length,channel);
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193 }
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194 }
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195
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196 }