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<title>Recorder Task</title>
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<h2 id="log">Record</h2>
<h3>Description</h3>
<p>A recorder is a listener to the current build process that records the output to a file.</p>

<p>Several recorders can exist at the same time.  Each recorder is associated with a file.  The
filename is used as a unique identifier for the recorders.  The first call to
the <code>record</code> task with an unused filename will create a recorder (using the parameters
provided) and add it to the listeners of the build.  All subsequent calls to the <code>record</code>
task using this filename will modify that recorder's state (recording or not) or other properties
(like logging level).</p>

<p>Some technical issues: the file's print stream is flushed for <q>finished</q> events
(<q>buildFinished</q>, <q>targetFinished</q> and <q>taskFinished</q>), and is closed on
a <q>buildFinished</q> event.</p>

<h3>Parameters</h3>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>name</td>
    <td>The name of the file this logger is associated with.</td>
    <td>Yes</td>
  </tr>
  <tr>
    <td>action</td>
    <td>This tells the logger what to do: should it start recording or stop?  The first time that
      the recorder task is called for this logfile, and if this attribute is not provided, then the
      default for this attribute is <q>start</q>.  If this attribute is not provided on subsequent
      calls, then the state remains as previous.</td>
    <td>No [values = <q>start|stop</q>, default = no state change]</td>
  </tr>
  <tr>
    <td>append</td>
    <td>Should the recorder append to a file, or create a new one? This is only applicable the first
      time this task is called for this file.</td>
    <td>No [values = <q>start|stop</q>, default = no state change]</td>
  </tr>
  <tr>
    <td>emacsmode</td>
    <td>Removes <code>[task]</code> banners like Apache Ant's <kbd>-emacs</kbd> command line
      switch if set to <q>true</q>.</td>
    <td>No; default is <q>false</q></td>
  </tr>
  <tr>
    <td>loglevel</td>
    <td>At what logging level should this recorder instance record to?  This is not a once only
      parameter (like <var>append</var> is)&mdash;you can increase or decrease the logging level as
      the build process continues.
    </td>
    <td>No [values = <q>error|warn|info|verbose|debug</q>, default = no change]</td>
  </tr>
</table>

<h3>Examples</h3>
<p>The following <samp>build.xml</samp> snippet is an example of how to use the recorder to record
just the <code>&lt;javac&gt;</code> task:</p>
<pre>
    ...
    &lt;compile &gt;
        &lt;record name=&quot;log.txt&quot; action=&quot;start&quot;/&gt;
        &lt;javac ...
        &lt;record name=&quot;log.txt&quot; action=&quot;stop&quot;/&gt;
    &lt;compile/&gt;
    ...
</pre>

<p>The following two calls to <code>&lt;record&gt;</code> set up two recorders: one to
file <samp>records-simple.log</samp> at logging level <q>info</q> (the default) and one to
file <samp>ISO.log</samp> using logging level of <q>verbose</q>.</p>
<pre>
    ...
    &lt;record name=&quot;records-simple.log&quot;/&gt;
    &lt;record name=&quot;ISO.log&quot; loglevel=&quot;verbose&quot;/&gt;
    ...
</pre>

<h3>Notes</h3>
<p>There is some functionality that I would like to be able to add in the future.  They include
things like the following:</p>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>listener</td>
    <td>A classname of a build listener to use from this point on instead of the default
      listener.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>includetarget</td>
    <td rowspan="2">A comma-separated list of targets to automatically record.  If this value
      is <q>all</q>, then all targets are recorded.</td>
    <td>No; default is <q>all</q></td>
  </tr>
  <tr>
    <td>excludetarget</td>
    <td>No</td>
  </tr>
  <tr>
    <td>includetask</td>
    <td rowspan="2">A comma-separated list of tasks to automatically record or not.  This could be
      difficult as it may conflict with the <code>includetarget/excludetarget</code>.
      (e.g.: <code>includetarget=&quot;compile&quot; excludetask=&quot;javac&quot;</code>, what
      should happen?)</td>
    <td>No</td>
  </tr>
  <tr>
    <td>excludetask</td>
    <td>No</td>
  </tr>
  <tr>
    <td>action</td>
    <td>add greater flexibility to the <var>action</var> attribute.  Things like <q>close</q> to
      close the print stream.</td>
    <td>No</td>
  </tr>
</table>

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