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<title>6.29.5.4 TimedRotatingFileHandler</title>
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<H3><A NAME="SECTION0082954000000000000000">
6.29.5.4 TimedRotatingFileHandler</A>
</H3>

<P>
The <tt class="class">TimedRotatingFileHandler</tt> class supports rotation of disk log files
at certain timed intervals.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-2516' xml:id='l2h-2516' class="class">TimedRotatingFileHandler</tt></b>(</nobr></td>
  <td><var>filename
                                            </var><big>[</big><var>,when
                                            </var><big>[</big><var>,interval
                                            </var><big>[</big><var>,backupCount</var><big>]</big><var></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>

<P>
Returns a new instance of the <tt class="class">TimedRotatingFileHandler</tt> class. The
specified file is opened and used as the stream for logging. On rotating
it also sets the filename suffix. Rotating happens based on the product
of <var>when</var> and <var>interval</var>.

<P>
You can use the <var>when</var> to specify the type of <var>interval</var>. The
list of possible values is, note that they are not case sensitive:

<P>
<div class="center"><table class="realtable">
  <thead>
    <tr>
      <th class="left"  >Value</th>
      <th class="left"  >Type of interval</th>
      </tr>
    </thead>
  <tbody>
    <tr><td class="left"   valign="baseline">S</td>
        <td class="left"  >Seconds</td></tr>
    <tr><td class="left"   valign="baseline">M</td>
        <td class="left"  >Minutes</td></tr>
    <tr><td class="left"   valign="baseline">H</td>
        <td class="left"  >Hours</td></tr>
    <tr><td class="left"   valign="baseline">D</td>
        <td class="left"  >Days</td></tr>
    <tr><td class="left"   valign="baseline">W</td>
        <td class="left"  >Week day (0=Monday)</td></tr>
    <tr><td class="left"   valign="baseline">midnight</td>
        <td class="left"  >Roll over at midnight</td></tr></tbody>
</table></div>

<P>
If <var>backupCount</var> is non-zero, the system will save old log files by
appending the extensions ".1", ".2" etc., to the filename. For example,
with a <var>backupCount</var> of 5 and a base file name of <span class="file">app.log</span>,
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
<span class="file">app.log.5</span>. The file being written to is always <span class="file">app.log</span>.
When this file is filled, it is closed and renamed to <span class="file">app.log.1</span>,
and if files <span class="file">app.log.1</span>, <span class="file">app.log.2</span>, etc. exist, then they
are renamed to <span class="file">app.log.2</span>, <span class="file">app.log.3</span> etc. respectively.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-2517' xml:id='l2h-2517' class="method">doRollover</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Does a rollover, as described above.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-2518' xml:id='l2h-2518' class="method">emit</tt></b>(</nobr></td>
  <td><var>record</var>)</td></tr></table></dt>
<dd>
Outputs the record to the file, catering for rollover as described
above.
</dl>

<P>

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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