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1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.xml.internal.org.jvnet.mimepull; |
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27 |
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28 import java.io.File; |
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29 import java.io.IOException; |
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30 import java.io.RandomAccessFile; |
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31 import java.lang.ref.ReferenceQueue; |
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32 import java.lang.ref.WeakReference; |
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33 import java.util.ArrayList; |
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34 import java.util.List; |
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35 import java.util.concurrent.Executor; |
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36 import java.util.logging.Level; |
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37 import java.util.logging.Logger; |
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38 |
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39 /** |
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40 * Removing files based on this |
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41 * <a href="http://java.sun.com/developer/technicalArticles/javase/finalization/">article</a> |
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42 * |
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43 * @author Jitendra Kotamraju |
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44 */ |
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45 final class WeakDataFile extends WeakReference<DataFile> { |
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46 |
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47 private static final Logger LOGGER = Logger.getLogger(WeakDataFile.class.getName()); |
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48 //private static final int MAX_ITERATIONS = 2; |
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49 private static ReferenceQueue<DataFile> refQueue = new ReferenceQueue<DataFile>(); |
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50 private static List<WeakDataFile> refList = new ArrayList<WeakDataFile>(); |
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51 private final File file; |
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52 private final RandomAccessFile raf; |
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53 private static boolean hasCleanUpExecutor = false; |
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54 static { |
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55 CleanUpExecutorFactory executorFactory = CleanUpExecutorFactory.newInstance(); |
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56 if (executorFactory!=null) { |
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57 if (LOGGER.isLoggable(Level.FINE)) { |
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58 LOGGER.log(Level.FINE, "Initializing clean up executor for MIMEPULL: {0}", executorFactory.getClass().getName()); |
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59 } |
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60 Executor executor = executorFactory.getExecutor(); |
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61 executor.execute(new Runnable() { |
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62 @Override |
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63 public void run() { |
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64 WeakDataFile weak; |
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65 while (true) { |
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66 try { |
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67 weak = (WeakDataFile) refQueue.remove(); |
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68 if (LOGGER.isLoggable(Level.FINE)) { |
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69 LOGGER.log(Level.FINE, "Cleaning file = {0} from reference queue.", weak.file); |
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70 } |
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71 weak.close(); |
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72 } catch (InterruptedException e) { |
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73 } |
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74 } |
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75 } |
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76 }); |
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77 hasCleanUpExecutor = true; |
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78 } |
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79 } |
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80 |
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81 WeakDataFile(DataFile df, File file) { |
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82 super(df, refQueue); |
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83 refList.add(this); |
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84 this.file = file; |
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85 try { |
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86 raf = new RandomAccessFile(file, "rw"); |
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87 } catch(IOException ioe) { |
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88 throw new MIMEParsingException(ioe); |
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89 } |
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90 if (!hasCleanUpExecutor) { |
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91 drainRefQueueBounded(); |
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92 } |
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93 } |
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94 |
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95 synchronized void read(long pointer, byte[] buf, int offset, int length ) { |
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96 try { |
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97 raf.seek(pointer); |
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98 raf.readFully(buf, offset, length); |
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99 } catch(IOException ioe) { |
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100 throw new MIMEParsingException(ioe); |
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101 } |
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102 } |
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103 |
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104 synchronized long writeTo(long pointer, byte[] data, int offset, int length) { |
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105 try { |
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106 raf.seek(pointer); |
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107 raf.write(data, offset, length); |
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108 return raf.getFilePointer(); // Update pointer for next write |
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109 } catch(IOException ioe) { |
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110 throw new MIMEParsingException(ioe); |
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111 } |
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112 } |
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113 |
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114 void close() { |
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115 if (LOGGER.isLoggable(Level.FINE)) { |
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116 LOGGER.log(Level.FINE, "Deleting file = {0}", file.getName()); |
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117 } |
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118 refList.remove(this); |
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119 try { |
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120 raf.close(); |
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121 boolean deleted = file.delete(); |
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122 if (!deleted) { |
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123 if (LOGGER.isLoggable(Level.INFO)) { |
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124 LOGGER.log(Level.INFO, "File {0} was not deleted", file.getAbsolutePath()); |
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125 } |
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126 } |
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127 } catch(IOException ioe) { |
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128 throw new MIMEParsingException(ioe); |
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129 } |
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130 } |
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131 |
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132 void renameTo(File f) { |
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133 if (LOGGER.isLoggable(Level.FINE)) { |
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134 LOGGER.log(Level.FINE, "Moving file={0} to={1}", new Object[]{file, f}); |
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135 } |
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136 refList.remove(this); |
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137 try { |
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138 raf.close(); |
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139 boolean renamed = file.renameTo(f); |
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140 if (!renamed) { |
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141 if (LOGGER.isLoggable(Level.INFO)) { |
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142 LOGGER.log(Level.INFO, "File {0} was not moved to {1}", new Object[] {file.getAbsolutePath(), f.getAbsolutePath()}); |
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143 } |
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144 } |
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145 } catch(IOException ioe) { |
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146 throw new MIMEParsingException(ioe); |
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147 } |
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148 |
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149 } |
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150 |
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151 static void drainRefQueueBounded() { |
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152 WeakDataFile weak; |
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153 while (( weak = (WeakDataFile) refQueue.poll()) != null ) { |
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154 if (LOGGER.isLoggable(Level.FINE)) { |
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155 LOGGER.log(Level.FINE, "Cleaning file = {0} from reference queue.", weak.file); |
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156 } |
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157 weak.close(); |
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158 } |
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159 } |
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160 } |