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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: libchamplain Reference Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="index.html" title="libchamplain Reference Manual">
<link rel="up" href="ch05.html" title="Tile Caches">
<link rel="prev" href="ChamplainTileCache.html" title="ChamplainTileCache">
<link rel="next" href="ChamplainMemoryCache.html" title="ChamplainMemoryCache">
<meta name="generator" content="GTK-Doc V1.24 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#ChamplainFileCache.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#ChamplainFileCache.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_properties">  <span class="dim">|</span> 
                  <a href="#ChamplainFileCache.properties" class="shortcut">Properties</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="ch05.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="ChamplainTileCache.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="ChamplainMemoryCache.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></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 class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="ChamplainFileCache.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="returnvalue">ChamplainFileCache</span></a> *
</td>
<td class="function_name">
<a class="link" href="ChamplainFileCache.html#champlain-file-cache-new-full" title="champlain_file_cache_new_full ()">champlain_file_cache_new_full</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">guint</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="ChamplainFileCache.html#champlain-file-cache-purge" title="champlain_file_cache_purge ()">champlain_file_cache_purge</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ChamplainFileCache.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type">
<span class="type">gchar</span> *</td>
<td class="property_name"><a class="link" href="ChamplainFileCache.html#ChamplainFileCache--cache-dir" title="The “cache-dir” property">cache-dir</a></td>
<td class="property_flags">Read / Write / Construct Only</td>
</tr>
<tr>
<td class="property_type"><span class="type">guint</span></td>
<td class="property_name"><a class="link" href="ChamplainFileCache.html#ChamplainFileCache--size-limit" title="The “size-limit” property">size-limit</a></td>
<td class="property_flags">Read / Write / Construct</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ChamplainFileCache.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="ChamplainFileCache.html#ChamplainFileCache-struct" title="struct ChamplainFileCache">ChamplainFileCache</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ChamplainFileCache.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    GObject
    <span class="lineart">╰──</span> GInitiallyUnowned
        <span class="lineart">╰──</span> <a class="link" href="ChamplainMapSource.html" title="ChamplainMapSource">ChamplainMapSource</a>
            <span class="lineart">╰──</span> <a class="link" href="ChamplainTileCache.html" title="ChamplainTileCache">ChamplainTileCache</a>
                <span class="lineart">╰──</span> ChamplainFileCache
</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.functions_details"></a><h2>Functions</h2>
<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="refsect3">
<a name="id-1.5.4.3.8.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>size_limit</p></td>
<td class="parameter_description"><p>maximum size of the cache in bytes</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cache_dir</p></td>
<td class="parameter_description"><p> the directory where the cache is created. When cache_dir == NULL,
a cache in ~/.cache/champlain is used. </p></td>
<td class="parameter_annotations"><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 class="parameter_name"><p>renderer</p></td>
<td class="parameter_description"><p>the <a class="link" href="ChamplainRenderer.html" title="ChamplainRenderer"><span class="type">ChamplainRenderer</span></a> used for tiles rendering</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.4.3.8.2.6"></a><h4>Returns</h4>
<p> a constructed <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a></p>
</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="refsect3">
<a name="id-1.5.4.3.8.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>file_cache</p></td>
<td class="parameter_description"><p>a <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size_limit</p></td>
<td class="parameter_description"><p>the cache limit in bytes</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</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="refsect3">
<a name="id-1.5.4.3.8.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>file_cache</p></td>
<td class="parameter_description"><p>a <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.4.3.8.4.6"></a><h4>Returns</h4>
<p> size limit</p>
</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="refsect3">
<a name="id-1.5.4.3.8.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>file_cache</p></td>
<td class="parameter_description"><p>a <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.4.3.8.5.6"></a><h4>Returns</h4>
<p> the directory</p>
</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="refsect3">
<a name="id-1.5.4.3.8.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>file_cache</p></td>
<td class="parameter_description"><p>a <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</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="refsect3">
<a name="id-1.5.4.3.8.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>file_cache</p></td>
<td class="parameter_description"><p>a <a class="link" href="ChamplainFileCache.html" title="ChamplainFileCache"><span class="type">ChamplainFileCache</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 0.4</p>
</div>
</div>
<div class="refsect1">
<a name="ChamplainFileCache.other_details"></a><h2>Types and Values</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>
</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> *</pre>
<p>The directory where the tile database is stored.</p>
<p>Flags: Read / Write / Construct Only</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></pre>
<p>The cache size limit in bytes.</p>
<p>Note: this new value will not be applied until you call <a class="link" href="ChamplainFileCache.html#champlain-file-cache-purge" title="champlain_file_cache_purge ()"><code class="function">champlain_file_cache_purge()</code></a></p>
<p>Flags: Read / Write / Construct</p>
<p>Allowed values: [1,G_MAXINT]</p>
<p>Default value: 100000000</p>
<p class="since">Since: 0.4</p>
</div>
</div>
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