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<title>Soprano.Util.SignalCacheModel</title>
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KDE 4.9 PyKDE API Reference
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<h1>SignalCacheModel Class Reference</h1>
<code>from PyKDE4.soprano import *</code>
<p>
Inherits: <a href="../soprano/Soprano.FilterModel.html">Soprano.FilterModel</a> → <a href="../soprano/Soprano.Model.html">Soprano.Model</a> → QObject<br />
Namespace: <a href="../soprano/Soprano.Util.html">Soprano.Util</a><br />
<h2>Detailed Description</h2>
<p>\class SignalCacheModel signalcachemodel.h Soprano/Util/SignalCacheModel
</p>
<p>
Caches multiple signals into one to avoid slowdown when adding
or removing many statements.
</p>
<p>
When adding or removing many statements with separate calls to Model.addStatement
or Model.removeStatement Model emits signals Model.statementsAdded and Model.statementsRemoved
over and over for each call. This can slow down an application that monitors
the state of the model.
</p>
<p>
The SignalCacheModel caches multiple emitted signals into one, trying to ensure
that only one signal is delivered in a certain time. The downside of this is
that signals are not delivered immiadetely but through the event loop. This,
however, should seldomly be a problem.
</p>
<p>
<dl class="author" compact><dt><b>Author:</b></dt><dd> Sebastian Trueg <trueg@kde.org> </dd></dl>
</p>
<p>
<dl class="since" compact><dt><b>Since:</b></dt><dd> 2.1
</dd></dl>
</p>
<table border="0" cellpadding="0" cellspacing="0"><tr><td colspan="2"><br><h2>Methods</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#SignalCacheModel">__init__</a> (self, <a href="../soprano/Soprano.Model.html">Soprano.Model</a> parent=0)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="#cacheTime">cacheTime</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#parentStatementsAdded">parentStatementsAdded</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#parentStatementsRemoved">parentStatementsRemoved</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#setCacheTime">setCacheTime</a> (self, int msec)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#timerEvent">timerEvent</a> (self, QTimerEvent event)</td></tr>
</table>
<hr><h2>Method Documentation</h2><a class="anchor" name="SignalCacheModel"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">__init__</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../soprano/Soprano.Model.html">Soprano.Model</a> </td>
<td class="paramname"><em>parent=0</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Create a new SignalCacheModel.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>parent</em> </td><td> The parent Model to forward
the actual calls to.
</td></tr>
</table></dl>
<p>
</p></div></div><a class="anchor" name="cacheTime"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">int cacheTime</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>The cache time.
\sa setCacheTime
</p></div></div><a class="anchor" name="parentStatementsAdded"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> parentStatementsAdded</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Reimplemented to do the actual signal caching.
</p></div></div><a class="anchor" name="parentStatementsRemoved"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> parentStatementsRemoved</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Reimplemented to do the actual signal caching.
</p></div></div><a class="anchor" name="setCacheTime"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> setCacheTime</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>msec</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Signals are only delivered once every <b>msec</b> milliseconds.
</p>
<p>
Default value is 50
</p></div></div><a class="anchor" name="timerEvent"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> timerEvent</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">QTimerEvent </td>
<td class="paramname"><em>event</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
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