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annotate src/org/eclipse/jetty/util/RolloverFileOutputStream.java @ 848:22a4e93ed20e

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 16:38:36 -0600
parents 3428c60d7cfc
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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.util;
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20
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21 import java.io.File;
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22 import java.io.FileOutputStream;
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23 import java.io.FilterOutputStream;
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24 import java.io.IOException;
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25 import java.io.OutputStream;
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26 import java.text.SimpleDateFormat;
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27 import java.util.Calendar;
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28 import java.util.Date;
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29 import java.util.GregorianCalendar;
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30 import java.util.Locale;
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31 import java.util.TimeZone;
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32 import java.util.Timer;
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33 import java.util.TimerTask;
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34
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35 /**
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36 * RolloverFileOutputStream
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37 *
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38 * This output stream puts content in a file that is rolled over every 24 hours.
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39 * The filename must include the string "yyyy_mm_dd", which is replaced with the
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40 * actual date when creating and rolling over the file.
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41 *
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42 * Old files are retained for a number of days before being deleted.
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43 *
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44 *
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45 */
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46 public class RolloverFileOutputStream extends FilterOutputStream
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47 {
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48 private static Timer __rollover;
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49
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50 final static String YYYY_MM_DD="yyyy_mm_dd";
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51 final static String ROLLOVER_FILE_DATE_FORMAT = "yyyy_MM_dd";
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52 final static String ROLLOVER_FILE_BACKUP_FORMAT = "HHmmssSSS";
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53 final static int ROLLOVER_FILE_RETAIN_DAYS = 31;
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54
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55 private RollTask _rollTask;
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56 private SimpleDateFormat _fileBackupFormat;
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57 private SimpleDateFormat _fileDateFormat;
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58
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59 private String _filename;
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60 private File _file;
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61 private boolean _append;
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62 private int _retainDays;
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63
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64 /* ------------------------------------------------------------ */
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65 /**
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66 * @param filename The filename must include the string "yyyy_mm_dd",
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67 * which is replaced with the actual date when creating and rolling over the file.
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68 * @throws IOException
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69 */
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70 public RolloverFileOutputStream(String filename)
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71 throws IOException
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72 {
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73 this(filename,true,ROLLOVER_FILE_RETAIN_DAYS);
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74 }
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75
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76 /* ------------------------------------------------------------ */
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77 /**
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78 * @param filename The filename must include the string "yyyy_mm_dd",
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79 * which is replaced with the actual date when creating and rolling over the file.
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80 * @param append If true, existing files will be appended to.
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81 * @throws IOException
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82 */
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83 public RolloverFileOutputStream(String filename, boolean append)
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84 throws IOException
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85 {
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86 this(filename,append,ROLLOVER_FILE_RETAIN_DAYS);
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87 }
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88
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89 /* ------------------------------------------------------------ */
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90 /**
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91 * @param filename The filename must include the string "yyyy_mm_dd",
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92 * which is replaced with the actual date when creating and rolling over the file.
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93 * @param append If true, existing files will be appended to.
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94 * @param retainDays The number of days to retain files before deleting them. 0 to retain forever.
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95 * @throws IOException
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96 */
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97 public RolloverFileOutputStream(String filename,
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98 boolean append,
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99 int retainDays)
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100 throws IOException
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101 {
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102 this(filename,append,retainDays,TimeZone.getDefault());
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103 }
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104
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105 /* ------------------------------------------------------------ */
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106 /**
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107 * @param filename The filename must include the string "yyyy_mm_dd",
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108 * which is replaced with the actual date when creating and rolling over the file.
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109 * @param append If true, existing files will be appended to.
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110 * @param retainDays The number of days to retain files before deleting them. 0 to retain forever.
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111 * @throws IOException
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112 */
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113 public RolloverFileOutputStream(String filename,
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114 boolean append,
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115 int retainDays,
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116 TimeZone zone)
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117 throws IOException
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118 {
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119
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120 this(filename,append,retainDays,zone,null,null);
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121 }
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122
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123 /* ------------------------------------------------------------ */
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124 /**
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125 * @param filename The filename must include the string "yyyy_mm_dd",
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126 * which is replaced with the actual date when creating and rolling over the file.
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127 * @param append If true, existing files will be appended to.
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128 * @param retainDays The number of days to retain files before deleting them. 0 to retain forever.
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129 * @param dateFormat The format for the date file substitution. The default is "yyyy_MM_dd".
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130 * @param backupFormat The format for the file extension of backup files. The default is "HHmmssSSS".
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131 * @throws IOException
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132 */
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133 public RolloverFileOutputStream(String filename,
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134 boolean append,
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135 int retainDays,
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136 TimeZone zone,
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137 String dateFormat,
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138 String backupFormat)
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139 throws IOException
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140 {
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141 super(null);
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142
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143 if (dateFormat==null)
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144 dateFormat=ROLLOVER_FILE_DATE_FORMAT;
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145 _fileDateFormat = new SimpleDateFormat(dateFormat);
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146
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147 if (backupFormat==null)
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148 backupFormat=ROLLOVER_FILE_BACKUP_FORMAT;
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149 _fileBackupFormat = new SimpleDateFormat(backupFormat);
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150
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151 _fileBackupFormat.setTimeZone(zone);
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152 _fileDateFormat.setTimeZone(zone);
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153
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154 if (filename!=null)
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155 {
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156 filename=filename.trim();
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157 if (filename.length()==0)
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158 filename=null;
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159 }
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160 if (filename==null)
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161 throw new IllegalArgumentException("Invalid filename");
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162
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163 _filename=filename;
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164 _append=append;
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165 _retainDays=retainDays;
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166 setFile();
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167
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168 synchronized(RolloverFileOutputStream.class)
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169 {
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170 if (__rollover==null)
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171 __rollover=new Timer(RolloverFileOutputStream.class.getName(),true);
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172
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173 _rollTask=new RollTask();
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174
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175 Calendar now = Calendar.getInstance();
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176 now.setTimeZone(zone);
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177
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178 GregorianCalendar midnight =
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179 new GregorianCalendar(now.get(Calendar.YEAR),
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180 now.get(Calendar.MONTH),
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181 now.get(Calendar.DAY_OF_MONTH),
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182 23,0);
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183 midnight.setTimeZone(zone);
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184 midnight.add(Calendar.HOUR,1);
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185 __rollover.scheduleAtFixedRate(_rollTask,midnight.getTime(),1000L*60*60*24);
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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 public String getFilename()
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191 {
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192 return _filename;
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193 }
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194
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195 /* ------------------------------------------------------------ */
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196 public String getDatedFilename()
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197 {
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198 if (_file==null)
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199 return null;
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200 return _file.toString();
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201 }
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202
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203 /* ------------------------------------------------------------ */
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204 public int getRetainDays()
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205 {
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206 return _retainDays;
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207 }
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208
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209 /* ------------------------------------------------------------ */
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210 private synchronized void setFile()
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211 throws IOException
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212 {
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213 // Check directory
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214 File file = new File(_filename);
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215 _filename=file.getCanonicalPath();
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216 file=new File(_filename);
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217 File dir= new File(file.getParent());
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218 if (!dir.isDirectory() || !dir.canWrite())
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219 throw new IOException("Cannot write log directory "+dir);
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220
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221 Date now=new Date();
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222
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223 // Is this a rollover file?
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224 String filename=file.getName();
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225 int i=filename.toLowerCase(Locale.ENGLISH).indexOf(YYYY_MM_DD);
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226 if (i>=0)
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227 {
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228 file=new File(dir,
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229 filename.substring(0,i)+
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230 _fileDateFormat.format(now)+
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231 filename.substring(i+YYYY_MM_DD.length()));
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232 }
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233
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234 if (file.exists()&&!file.canWrite())
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235 throw new IOException("Cannot write log file "+file);
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236
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237 // Do we need to change the output stream?
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238 if (out==null || !file.equals(_file))
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239 {
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240 // Yep
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241 _file=file;
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242 if (!_append && file.exists())
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243 file.renameTo(new File(file.toString()+"."+_fileBackupFormat.format(now)));
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244 OutputStream oldOut=out;
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245 out=new FileOutputStream(file.toString(),_append);
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246 if (oldOut!=null)
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247 oldOut.close();
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248 //if(log.isDebugEnabled())log.debug("Opened "+_file);
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249 }
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250 }
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251
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252 /* ------------------------------------------------------------ */
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253 private void removeOldFiles()
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254 {
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255 if (_retainDays>0)
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256 {
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257 long now = System.currentTimeMillis();
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258
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259 File file= new File(_filename);
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260 File dir = new File(file.getParent());
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261 String fn=file.getName();
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262 int s=fn.toLowerCase(Locale.ENGLISH).indexOf(YYYY_MM_DD);
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263 if (s<0)
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264 return;
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265 String prefix=fn.substring(0,s);
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266 String suffix=fn.substring(s+YYYY_MM_DD.length());
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267
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268 String[] logList=dir.list();
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269 for (int i=0;i<logList.length;i++)
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270 {
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271 fn = logList[i];
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272 if(fn.startsWith(prefix)&&fn.indexOf(suffix,prefix.length())>=0)
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273 {
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274 File f = new File(dir,fn);
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275 long date = f.lastModified();
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276 if ( ((now-date)/(1000*60*60*24))>_retainDays)
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277 f.delete();
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278 }
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279 }
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280 }
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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 void write (byte[] buf)
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286 throws IOException
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287 {
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288 out.write (buf);
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289 }
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290
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291 /* ------------------------------------------------------------ */
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292 @Override
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293 public void write (byte[] buf, int off, int len)
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294 throws IOException
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295 {
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296 out.write (buf, off, len);
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297 }
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298
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299 /* ------------------------------------------------------------ */
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300 /**
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301 */
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302 @Override
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303 public void close()
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304 throws IOException
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305 {
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306 synchronized(RolloverFileOutputStream.class)
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307 {
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308 try{super.close();}
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309 finally
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310 {
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311 out=null;
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312 _file=null;
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313 }
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314
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315 _rollTask.cancel();
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316 }
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317 }
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318
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319 /* ------------------------------------------------------------ */
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320 /* ------------------------------------------------------------ */
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321 /* ------------------------------------------------------------ */
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322 private class RollTask extends TimerTask
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323 {
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324 @Override
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325 public void run()
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326 {
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327 try
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328 {
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329 RolloverFileOutputStream.this.setFile();
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330 RolloverFileOutputStream.this.removeOldFiles();
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331
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332 }
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333 catch(IOException e)
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334 {
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335 // Cannot log this exception to a LOG, as RolloverFOS can be used by logging
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parents:
diff changeset
336 e.printStackTrace();
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
337 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
338 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
339 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
340 }