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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<th width="100%" align="center">Evolution-Data-Server Manual: Backend Utilities (libebackend)</th>
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<tr><td colspan="5" class="shortcuts">
<a href="#libebackend-EFileCache.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#libebackend-EFileCache.description" class="shortcut">Description</a>
</td></tr>
</table>
<div class="refentry">
<a name="libebackend-EFileCache"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libebackend-EFileCache.top_of_page"></a>EFileCache</span></h2>
<p>EFileCache — Simple file-based hash table for strings</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="libebackend-EFileCache.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">struct              <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache">EFileCache</a>;
<a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="returnvalue">EFileCache</span></a> *        <a class="link" href="libebackend-EFileCache.html#e-file-cache-new" title="e_file_cache_new ()">e_file_cache_new</a>                    (<em class="parameter"><code>const <span class="type">gchar</span> *filename</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="libebackend-EFileCache.html#e-file-cache-remove" title="e_file_cache_remove ()">e_file_cache_remove</a>                 (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="libebackend-EFileCache.html#e-file-cache-clean" title="e_file_cache_clean ()">e_file_cache_clean</a>                  (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);
const <span class="returnvalue">gchar</span> *       <a class="link" href="libebackend-EFileCache.html#e-file-cache-get-object" title="e_file_cache_get_object ()">e_file_cache_get_object</a>             (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>);
<span class="returnvalue">GSList</span> *            <a class="link" href="libebackend-EFileCache.html#e-file-cache-get-objects" title="e_file_cache_get_objects ()">e_file_cache_get_objects</a>            (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);
<span class="returnvalue">GSList</span> *            <a class="link" href="libebackend-EFileCache.html#e-file-cache-get-keys" title="e_file_cache_get_keys ()">e_file_cache_get_keys</a>               (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="libebackend-EFileCache.html#e-file-cache-add-object" title="e_file_cache_add_object ()">e_file_cache_add_object</a>             (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *value</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="libebackend-EFileCache.html#e-file-cache-replace-object" title="e_file_cache_replace_object ()">e_file_cache_replace_object</a>         (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *new_value</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="libebackend-EFileCache.html#e-file-cache-remove-object" title="e_file_cache_remove_object ()">e_file_cache_remove_object</a>          (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libebackend-EFileCache.html#e-file-cache-freeze-changes" title="e_file_cache_freeze_changes ()">e_file_cache_freeze_changes</a>         (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libebackend-EFileCache.html#e-file-cache-thaw-changes" title="e_file_cache_thaw_changes ()">e_file_cache_thaw_changes</a>           (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);
const <span class="returnvalue">gchar</span> *       <a class="link" href="libebackend-EFileCache.html#e-file-cache-get-filename" title="e_file_cache_get_filename ()">e_file_cache_get_filename</a>           (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libebackend-EFileCache.description"></a><h2>Description</h2>
<p>
An <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> is a simple hash table of strings backed by an XML file
for permanent storage.  The XML file is written to disk with every unless
the cache is temporarily frozen with <a class="link" href="libebackend-EFileCache.html#e-file-cache-freeze-changes" title="e_file_cache_freeze_changes ()"><code class="function">e_file_cache_freeze_changes()</code></a>.
</p>
</div>
<div class="refsect1">
<a name="libebackend-EFileCache.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="EFileCache"></a><h3>struct EFileCache</h3>
<pre class="programlisting">struct EFileCache {
	GObject parent;
	EFileCachePrivate *priv;
};
</pre>
<p>
Contains only private data that should be read and manipulated using the
functions below.
</p>
</div>
<hr>
<div class="refsect2">
<a name="e-file-cache-new"></a><h3>e_file_cache_new ()</h3>
<pre class="programlisting"><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="returnvalue">EFileCache</span></a> *        e_file_cache_new                    (<em class="parameter"><code>const <span class="type">gchar</span> *filename</code></em>);</pre>
<p>
Creates a new <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> object, which implements a cache of
objects.  Useful for remote backends.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>filename where the cache is kept</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-file-cache-remove"></a><h3>e_file_cache_remove ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            e_file_cache_remove                 (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);</pre>
<p>
Remove the cache from disk.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cache</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if successful, <code class="literal">FALSE</code> if a file error occurred</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-file-cache-clean"></a><h3>e_file_cache_clean ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            e_file_cache_clean                  (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);</pre>
<p>
Clean up the cache's contents.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cache</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> always</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-file-cache-get-object"></a><h3>e_file_cache_get_object ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> *       e_file_cache_get_object             (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>);</pre>
<p>
Returns the object corresponding to <em class="parameter"><code>key</code></em>.  If no such object exists
in <em class="parameter"><code>cache</code></em>, the function returns <code class="literal">NULL</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cache</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>the hash key of the object to find</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the object corresponding to <em class="parameter"><code>key</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-file-cache-get-objects"></a><h3>e_file_cache_get_objects ()</h3>
<pre class="programlisting"><span class="returnvalue">GSList</span> *            e_file_cache_get_objects            (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);</pre>
<p>
Returns a list of objects in <em class="parameter"><code>cache</code></em>.  The objects are owned by <em class="parameter"><code>cache</code></em> and
must not be modified or freed.  Free the returned list with <code class="function">g_slist_free()</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cache</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a list of objects</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-file-cache-get-keys"></a><h3>e_file_cache_get_keys ()</h3>
<pre class="programlisting"><span class="returnvalue">GSList</span> *            e_file_cache_get_keys               (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);</pre>
<p>
Returns a list of keys in <em class="parameter"><code>cache</code></em>.  The keys are owned by <em class="parameter"><code>cache</code></em> and must
not be modified or freed.  Free the returned list with <code class="function">g_slist_free()</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cache</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a list of keys</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-file-cache-add-object"></a><h3>e_file_cache_add_object ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            e_file_cache_add_object             (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *value</code></em>);</pre>
<p>
Adds a new <em class="parameter"><code>key</code></em> / <em class="parameter"><code>value</code></em> entry to <em class="parameter"><code>cache</code></em>.  If an object corresponding
to <em class="parameter"><code>key</code></em> already exists in <em class="parameter"><code>cache</code></em>, the function returns <code class="literal">FALSE</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cache</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>the hash key of the object to add</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>the object to add</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if successful, <code class="literal">FALSE</code> if <em class="parameter"><code>key</code></em> already exists</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-file-cache-replace-object"></a><h3>e_file_cache_replace_object ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            e_file_cache_replace_object         (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *new_value</code></em>);</pre>
<p>
Replaces the object corresponding to <em class="parameter"><code>key</code></em> with <em class="parameter"><code>new_value</code></em>.
If no such object exists in <em class="parameter"><code>cache</code></em>, the function returns <code class="literal">FALSE</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>cache</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>the hash key of the object to replace</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>new_value</code></em> :</span></p></td>
<td>the new object for <em class="parameter"><code>key</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if successful, <code class="literal">FALSE</code> if <em class="parameter"><code>key</code></em> was not found</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="e-file-cache-remove-object"></a><h3>e_file_cache_remove_object ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            e_file_cache_remove_object          (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *key</code></em>);</pre>
<p>
Removes the object corresponding to <em class="parameter"><code>key</code></em> from <em class="parameter"><code>cache</code></em>.
If no such object exists in <em class="parameter"><code>cache</code></em>, the function returns <code class="literal">FALSE</code>.
</p>
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<td><p><span class="term"><em class="parameter"><code>cache</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a>
</td>
</tr>
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<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>the hash key of the object to remove</td>
</tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if successful, <code class="literal">FALSE</code> if <em class="parameter"><code>key</code></em> was not found</td>
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<div class="refsect2">
<a name="e-file-cache-freeze-changes"></a><h3>e_file_cache_freeze_changes ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                e_file_cache_freeze_changes         (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);</pre>
<p>
Disables temporarily all writes to disk for <em class="parameter"><code>cache</code></em>.
</p>
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<td><p><span class="term"><em class="parameter"><code>cache</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a>
</td>
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<div class="refsect2">
<a name="e-file-cache-thaw-changes"></a><h3>e_file_cache_thaw_changes ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                e_file_cache_thaw_changes           (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);</pre>
<p>
Reverts the affects of <a class="link" href="libebackend-EFileCache.html#e-file-cache-freeze-changes" title="e_file_cache_freeze_changes ()"><code class="function">e_file_cache_freeze_changes()</code></a>.
Each change to <em class="parameter"><code>cache</code></em> is once again written to disk.
</p>
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<td><p><span class="term"><em class="parameter"><code>cache</code></em> :</span></p></td>
<td>an <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a>
</td>
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</table></div>
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<div class="refsect2">
<a name="e-file-cache-get-filename"></a><h3>e_file_cache_get_filename ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> *       e_file_cache_get_filename           (<em class="parameter"><code><a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><span class="type">EFileCache</span></a> *cache</code></em>);</pre>
<p>
Gets the name of the file where the cache is being stored.
</p>
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<td><p><span class="term"><em class="parameter"><code>cache</code></em> :</span></p></td>
<td>A <a class="link" href="libebackend-EFileCache.html#EFileCache" title="struct EFileCache"><code class="literal">EFileCache</code></a> object.</td>
</tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The name of the cache.</td>
</tr>
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