Mercurial > hg > blitz_stable
annotate src/com/go/trove/io/FileByteData.java @ 35:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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1 /* ==================================================================== |
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2 * Trove - Copyright (c) 1999-2000 Walt Disney Internet Group |
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3 * ==================================================================== |
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4 * The Tea Software License, Version 1.1 |
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5 * |
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. |
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7 * |
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8 * Redistribution and use in source and binary forms, with or without |
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9 * modification, are permitted provided that the following conditions |
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10 * are met: |
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11 * |
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12 * 1. Redistributions of source code must retain the above copyright |
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13 * notice, this list of conditions and the following disclaimer. |
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14 * |
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15 * 2. Redistributions in binary form must reproduce the above copyright |
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16 * notice, this list of conditions and the following disclaimer in |
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17 * the documentation and/or other materials provided with the |
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18 * distribution. |
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19 * |
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20 * 3. The end-user documentation included with the redistribution, |
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21 * if any, must include the following acknowledgment: |
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22 * "This product includes software developed by the |
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23 * Walt Disney Internet Group (http://opensource.go.com/)." |
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24 * Alternately, this acknowledgment may appear in the software itself, |
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25 * if and wherever such third-party acknowledgments normally appear. |
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26 * |
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must |
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28 * not be used to endorse or promote products derived from this |
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29 * software without prior written permission. For written |
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30 * permission, please contact opensource@dig.com. |
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31 * |
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32 * 5. Products derived from this software may not be called "Tea", |
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", |
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior |
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35 * written permission of the Walt Disney Internet Group. |
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36 * |
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS |
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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48 * ==================================================================== |
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49 * |
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50 * For more information about Tea, please see http://opensource.go.com/. |
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51 */ |
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52 |
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53 package com.go.trove.io; |
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54 |
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55 import java.io.OutputStream; |
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56 import java.io.File; |
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57 import java.io.RandomAccessFile; |
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58 import java.io.IOException; |
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59 |
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60 /****************************************************************************** |
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61 * A ByteData implementation that reads the contents of a file. |
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62 * |
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63 * @author Brian S O'Neill |
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64 * @version |
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65 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/12/06 <!-- $--> |
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66 */ |
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67 public class FileByteData implements ByteData { |
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68 private static final Object NULL = new Object(); |
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69 |
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70 private File mFile; |
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71 |
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72 // Thread-local reference to a RandomAccessFile. |
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73 private ThreadLocal mRAF = new ThreadLocal(); |
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74 |
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75 public FileByteData(File file) { |
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76 mFile = file; |
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77 // Open here so that if file isn't found, error is logged earlier. |
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78 open(); |
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79 } |
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80 |
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81 public long getByteCount() throws IOException { |
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82 // Keep file open to ensure that length doesn't change between call to |
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83 // getByteCount and writeTo. |
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84 |
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85 RandomAccessFile raf = open(); |
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86 if (raf == null) { |
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87 return 0; |
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88 } |
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89 else { |
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90 return raf.length(); |
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91 } |
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92 } |
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93 |
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94 public void writeTo(OutputStream out) throws IOException { |
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95 RandomAccessFile raf = open(); |
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96 if (raf == null) { |
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97 return; |
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98 } |
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99 |
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100 try { |
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101 long length = raf.length(); |
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102 int bufSize; |
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103 if (length > 4000) { |
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104 bufSize = 4000; |
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105 } |
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106 else { |
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107 bufSize = (int)length; |
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108 } |
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109 |
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110 byte[] inputBuffer = new byte[bufSize]; |
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111 |
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112 raf.seek(0); |
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113 |
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114 int readAmount; |
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115 while ((readAmount = raf.read(inputBuffer, 0, bufSize)) > 0) { |
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116 out.write(inputBuffer, 0, readAmount); |
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117 } |
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118 } |
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119 finally { |
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120 try { |
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121 finalize(); |
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122 } |
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123 catch (IOException e) { |
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124 } |
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125 } |
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126 } |
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127 |
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128 public void reset() throws IOException { |
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129 Object obj = mRAF.get(); |
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130 try { |
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131 if (obj instanceof RandomAccessFile) { |
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132 ((RandomAccessFile)obj).close(); |
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133 } |
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134 } |
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135 finally { |
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136 mRAF.set(null); |
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137 } |
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138 } |
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139 |
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140 protected final void finalize() throws IOException { |
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141 reset(); |
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142 } |
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143 |
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144 private RandomAccessFile open() { |
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145 Object obj = mRAF.get(); |
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146 if (obj instanceof RandomAccessFile) { |
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147 return (RandomAccessFile)obj; |
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148 } |
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149 else if (obj == NULL) { |
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150 return null; |
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151 } |
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152 |
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153 RandomAccessFile raf = null; |
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154 |
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155 try { |
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156 raf = new RandomAccessFile(mFile, "r"); |
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157 mRAF.set(raf); |
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158 } |
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159 catch (IOException e) { |
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160 mRAF.set(NULL); |
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161 Thread t = Thread.currentThread(); |
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162 t.getThreadGroup().uncaughtException(t, e); |
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163 } |
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164 |
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165 return raf; |
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166 } |
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167 } |