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| 55 | <H3><A NAME="SECTION0082954000000000000000"> |
| 56 | 6.29.5.4 TimedRotatingFileHandler</A> |
| 57 | </H3> |
| 58 | |
| 59 | <P> |
| 60 | The <tt class="class">TimedRotatingFileHandler</tt> class supports rotation of disk log files |
| 61 | at certain timed intervals. |
| 62 | |
| 63 | <P> |
| 64 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 65 | <td><nobr><b><span class="typelabel">class</span> <tt id='l2h-2516' xml:id='l2h-2516' class="class">TimedRotatingFileHandler</tt></b>(</nobr></td> |
| 66 | <td><var>filename |
| 67 | </var><big>[</big><var>,when |
| 68 | </var><big>[</big><var>,interval |
| 69 | </var><big>[</big><var>,backupCount</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt> |
| 70 | <dd> |
| 71 | |
| 72 | <P> |
| 73 | Returns a new instance of the <tt class="class">TimedRotatingFileHandler</tt> class. The |
| 74 | specified file is opened and used as the stream for logging. On rotating |
| 75 | it also sets the filename suffix. Rotating happens based on the product |
| 76 | of <var>when</var> and <var>interval</var>. |
| 77 | |
| 78 | <P> |
| 79 | You can use the <var>when</var> to specify the type of <var>interval</var>. The |
| 80 | list of possible values is, note that they are not case sensitive: |
| 81 | |
| 82 | <P> |
| 83 | <div class="center"><table class="realtable"> |
| 84 | <thead> |
| 85 | <tr> |
| 86 | <th class="left" >Value</th> |
| 87 | <th class="left" >Type of interval</th> |
| 88 | </tr> |
| 89 | </thead> |
| 90 | <tbody> |
| 91 | <tr><td class="left" valign="baseline">S</td> |
| 92 | <td class="left" >Seconds</td></tr> |
| 93 | <tr><td class="left" valign="baseline">M</td> |
| 94 | <td class="left" >Minutes</td></tr> |
| 95 | <tr><td class="left" valign="baseline">H</td> |
| 96 | <td class="left" >Hours</td></tr> |
| 97 | <tr><td class="left" valign="baseline">D</td> |
| 98 | <td class="left" >Days</td></tr> |
| 99 | <tr><td class="left" valign="baseline">W</td> |
| 100 | <td class="left" >Week day (0=Monday)</td></tr> |
| 101 | <tr><td class="left" valign="baseline">midnight</td> |
| 102 | <td class="left" >Roll over at midnight</td></tr></tbody> |
| 103 | </table></div> |
| 104 | |
| 105 | <P> |
| 106 | If <var>backupCount</var> is non-zero, the system will save old log files by |
| 107 | appending the extensions ".1", ".2" etc., to the filename. For example, |
| 108 | with a <var>backupCount</var> of 5 and a base file name of <span class="file">app.log</span>, |
| 109 | you would get <span class="file">app.log</span>, <span class="file">app.log.1</span>, <span class="file">app.log.2</span>, up to |
| 110 | <span class="file">app.log.5</span>. The file being written to is always <span class="file">app.log</span>. |
| 111 | When this file is filled, it is closed and renamed to <span class="file">app.log.1</span>, |
| 112 | and if files <span class="file">app.log.1</span>, <span class="file">app.log.2</span>, etc. exist, then they |
| 113 | are renamed to <span class="file">app.log.2</span>, <span class="file">app.log.3</span> etc. respectively. |
| 114 | </dl> |
| 115 | |
| 116 | <P> |
| 117 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 118 | <td><nobr><b><tt id='l2h-2517' xml:id='l2h-2517' class="method">doRollover</tt></b>(</nobr></td> |
| 119 | <td><var></var>)</td></tr></table></dt> |
| 120 | <dd> |
| 121 | Does a rollover, as described above. |
| 122 | </dl> |
| 123 | |
| 124 | <P> |
| 125 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 126 | <td><nobr><b><tt id='l2h-2518' xml:id='l2h-2518' class="method">emit</tt></b>(</nobr></td> |
| 127 | <td><var>record</var>)</td></tr></table></dt> |
| 128 | <dd> |
| 129 | Outputs the record to the file, catering for rollover as described |
| 130 | above. |
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