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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>ChamplainFileCache</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
<link rel="home" href="index.html" title="libchamplain Reference Manual">
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<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2">
<tr valign="middle">
<td><a accesskey="p" href="ChamplainTileCache.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td>
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<th width="100%" align="center">libchamplain Reference Manual</th>
<td><a accesskey="n" href="ChamplainMemoryCache.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td>
</tr>
<tr><td colspan="5" class="shortcuts">
<a href="#ChamplainFileCache.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#ChamplainFileCache.description" class="shortcut">Description</a>
                   | 
                  <a href="#ChamplainFileCache.object-hierarchy" class="shortcut">Object Hierarchy</a>
                   | 
                  <a href="#ChamplainFileCache.properties" class="shortcut">Properties</a>
</td></tr>
</table>
<div class="refentry">
<a name="ChamplainFileCache"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="ChamplainFileCache.top_of_page"></a>ChamplainFileCache</span></h2>
<p>ChamplainFileCache — Stores and loads cached tiles from the file system</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="ChamplainFileCache.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">struct              <a class="link" href="ChamplainFileCache.html#ChamplainFileCache-struct" title="struct ChamplainFileCache">ChamplainFileCache</a>;
<a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="returnvalue">ChamplainFileCache</span></a> * <a class="link" href="ChamplainFileCache.html#champlain-file-cache-new-full" title="champlain_file_cache_new_full ()">champlain_file_cache_new_full</a>      (<em class="parameter"><code><span class="type">guint</span> size_limit</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *cache_dir</code></em>,
                                                         <em class="parameter"><code><a class="link" href="ChamplainRenderer.html" title="ChamplainRenderer"><span class="type">ChamplainRenderer</span></a> *renderer</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="ChamplainFileCache.html#champlain-file-cache-set-size-limit" title="champlain_file_cache_set_size_limit ()">champlain_file_cache_set_size_limit</a> (<em class="parameter"><code><a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> *file_cache</code></em>,
                                                         <em class="parameter"><code><span class="type">guint</span> size_limit</code></em>);
<span class="returnvalue">guint</span>               <a class="link" href="ChamplainFileCache.html#champlain-file-cache-get-size-limit" title="champlain_file_cache_get_size_limit ()">champlain_file_cache_get_size_limit</a> (<em class="parameter"><code><a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> *file_cache</code></em>);
const <span class="returnvalue">gchar</span> *       <a class="link" href="ChamplainFileCache.html#champlain-file-cache-get-cache-dir" title="champlain_file_cache_get_cache_dir ()">champlain_file_cache_get_cache_dir</a>  (<em class="parameter"><code><a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> *file_cache</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="ChamplainFileCache.html#champlain-file-cache-purge" title="champlain_file_cache_purge ()">champlain_file_cache_purge</a>          (<em class="parameter"><code><a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> *file_cache</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="ChamplainFileCache.html#champlain-file-cache-purge-on-idle" title="champlain_file_cache_purge_on_idle ()">champlain_file_cache_purge_on_idle</a>  (<em class="parameter"><code><a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> *file_cache</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="ChamplainFileCache.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
  GObject
   +----GInitiallyUnowned
         +----<a class="link" href="ChamplainMapSource.html" title="ChamplainMapSource">ChamplainMapSource</a>
               +----<a class="link" href="ChamplainTileCache.html" title="ChamplainTileCache">ChamplainTileCache</a>
                     +----ChamplainFileCache
</pre>
</div>
<div class="refsect1">
<a name="ChamplainFileCache.properties"></a><h2>Properties</h2>
<pre class="synopsis">
  "<a class="link" href="ChamplainFileCache.html#ChamplainFileCache--cache-dir" title='The "cache-dir" property'>cache-dir</a>"                <span class="type">gchar</span>*                : Read / Write / Construct Only
  "<a class="link" href="ChamplainFileCache.html#ChamplainFileCache--size-limit" title='The "size-limit" property'>size-limit</a>"               <span class="type">guint</span>                 : Read / Write / Construct
</pre>
</div>
<div class="refsect1">
<a name="ChamplainFileCache.description"></a><h2>Description</h2>
<p>
<a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> is a cache that stores and retrieves tiles from the
file system. Tiles most frequently loaded gain in "popularity". This popularity
is taken into account when purging the cache.
</p>
</div>
<div class="refsect1">
<a name="ChamplainFileCache.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="ChamplainFileCache-struct"></a><h3>struct ChamplainFileCache</h3>
<pre class="programlisting">struct ChamplainFileCache;</pre>
<p>
The <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> structure contains only private data
and should be accessed using the provided API
</p>
<p class="since">Since 0.6</p>
</div>
<hr>
<div class="refsect2">
<a name="champlain-file-cache-new-full"></a><h3>champlain_file_cache_new_full ()</h3>
<pre class="programlisting"><a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="returnvalue">ChamplainFileCache</span></a> * champlain_file_cache_new_full      (<em class="parameter"><code><span class="type">guint</span> size_limit</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *cache_dir</code></em>,
                                                         <em class="parameter"><code><a class="link" href="ChamplainRenderer.html" title="ChamplainRenderer"><span class="type">ChamplainRenderer</span></a> *renderer</code></em>);</pre>
<p>
Constructor of <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>size_limit</code></em> :</span></p></td>
<td>maximal size of the cache in bytes</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cache_dir</code></em> :</span></p></td>
<td>the directory where the cache is created. When cache_dir == NULL,
a cache in ~/.cache/champlain is used. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>renderer</code></em> :</span></p></td>
<td>the <a class="link" href="ChamplainRenderer.html" title="ChamplainRenderer"><span class="type">ChamplainRenderer</span></a> used for tiles rendering</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a constructed <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.8</p>
</div>
<hr>
<div class="refsect2">
<a name="champlain-file-cache-set-size-limit"></a><h3>champlain_file_cache_set_size_limit ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                champlain_file_cache_set_size_limit (<em class="parameter"><code><a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> *file_cache</code></em>,
                                                         <em class="parameter"><code><span class="type">guint</span> size_limit</code></em>);</pre>
<p>
Sets the cache size limit in bytes.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>file_cache</code></em> :</span></p></td>
<td>a <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size_limit</code></em> :</span></p></td>
<td>the cache limit in bytes</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.4</p>
</div>
<hr>
<div class="refsect2">
<a name="champlain-file-cache-get-size-limit"></a><h3>champlain_file_cache_get_size_limit ()</h3>
<pre class="programlisting"><span class="returnvalue">guint</span>               champlain_file_cache_get_size_limit (<em class="parameter"><code><a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> *file_cache</code></em>);</pre>
<p>
Gets the cache size limit in bytes.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>file_cache</code></em> :</span></p></td>
<td>a <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>size limit</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.4</p>
</div>
<hr>
<div class="refsect2">
<a name="champlain-file-cache-get-cache-dir"></a><h3>champlain_file_cache_get_cache_dir ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> *       champlain_file_cache_get_cache_dir  (<em class="parameter"><code><a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> *file_cache</code></em>);</pre>
<p>
Gets the directory where the cache database is stored.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>file_cache</code></em> :</span></p></td>
<td>a <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the directory</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.6</p>
</div>
<hr>
<div class="refsect2">
<a name="champlain-file-cache-purge"></a><h3>champlain_file_cache_purge ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                champlain_file_cache_purge          (<em class="parameter"><code><a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> *file_cache</code></em>);</pre>
<p>
Purge the cache from the less popular tiles until cache's size limit is reached.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>file_cache</code></em> :</span></p></td>
<td>a <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.4</p>
</div>
<hr>
<div class="refsect2">
<a name="champlain-file-cache-purge-on-idle"></a><h3>champlain_file_cache_purge_on_idle ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                champlain_file_cache_purge_on_idle  (<em class="parameter"><code><a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a> *file_cache</code></em>);</pre>
<p>
Purge the cache from the less popular tiles until cache's size limit is reached.
This is a non blocking call as the purge will happen when the application is idle
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>file_cache</code></em> :</span></p></td>
<td>a <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.4</p>
</div>
</div>
<div class="refsect1">
<a name="ChamplainFileCache.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="ChamplainFileCache--cache-dir"></a><h3>The <code class="literal">"cache-dir"</code> property</h3>
<pre class="programlisting">  "cache-dir"                <span class="type">gchar</span>*                : Read / Write / Construct Only</pre>
<p>
The directory where the tile database is stored.
</p>
<p>Default value: NULL</p>
<p class="since">Since 0.6</p>
</div>
<hr>
<div class="refsect2">
<a name="ChamplainFileCache--size-limit"></a><h3>The <code class="literal">"size-limit"</code> property</h3>
<pre class="programlisting">  "size-limit"               <span class="type">guint</span>                 : Read / Write / Construct</pre>
<p>
The cache size limit in bytes.
</p>
<p>
Note: this new value will not be applied until you call <span class="type">champlain_cache_purge</span>
</p>
<p>Allowed values: [1,G_MAXLONG]</p>
<p>Default value: 100000000</p>
<p class="since">Since 0.4</p>
</div>
</div>
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