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<span class="ModifiedDate">
March 22, 2022 at 1:33 PM </span>
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<p>The <code>CacheInterface</code> interface defines functions that need to be implemented. To create a new cache that implements <code>CacheInterface</code> you must implement following functions:</p>
<ul>
<li>
<a href="#the-loaddata-function">loadData</a>
</li>
<li>
<a href="#the-savedata-function">saveData</a>
</li>
<li>
<a href="#the-gettime-function">getTime</a>
</li>
<li>
<a href="#the-purgecache-function">purgeCache</a>
</li>
</ul>
<p>Find a <a href="#template">template</a> at the end of this file.</p>
<h1><a id="functions" href="#functions" class="Permalink" aria-hidden="true" title="Permalink">#</a>Functions</h1>
<h2><a id="the-loaddata-function" href="#the-loaddata-function" class="Permalink" aria-hidden="true" title="Permalink">#</a>The <code>loadData</code> function</h2>
<p>This function loads data from the cache and returns the data in the same format provided to the <a href="#the-savedata-function">saveData</a> function.</p>
<pre><code class="language-PHP">loadData(): mixed
</code></pre>
<h2><a id="the-savedata-function" href="#the-savedata-function" class="Permalink" aria-hidden="true" title="Permalink">#</a>The <code>saveData</code> function</h2>
<p>This function stores the given data into the cache and returns the object instance.</p>
<pre><code class="language-PHP">saveData(mixed $data): self
</code></pre>
<h2><a id="the-gettime-function" href="#the-gettime-function" class="Permalink" aria-hidden="true" title="Permalink">#</a>The <code>getTime</code> function</h2>
<p>This function returns the last write time for the cache, or <code>false</code> if the cache does not yet exist. Please notice that cache refers to one specific item in the cache repository and might require additional data to identify a specific item (introduce custom functions where necessary!).</p>
<pre><code class="language-PHP">getTime(): int, false
</code></pre>
<h2><a id="the-purgecache-function" href="#the-purgecache-function" class="Permalink" aria-hidden="true" title="Permalink">#</a>The <code>purgeCache</code> function</h2>
<p>This function removes any data from the cache that is not within the given duration. The duration is specified in seconds and defines the period between now and the oldest item to keep.</p>
<pre><code class="language-PHP">purgeCache(int $duration): null
</code></pre>
<h1><a id="template" href="#template" class="Permalink" aria-hidden="true" title="Permalink">#</a>Template</h1>
<p>This is the bare minimum template for a new cache:</p>
<pre><code class="language-PHP">&lt;?php
class MyTypeCache implements CacheInterface {
public function loadData(){
// Implement your algorithm here!
return null;
}
public function saveData($data){
// Implement your algorithm here!
return $this;
}
public function getTime(){
// Implement your algorithm here!
return false;
}
public function purgeCache($duration){
// Implement your algorithm here!
}
}
// Imaginary empty line!
</code></pre>
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<!DOCTYPE html>
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<span class="ModifiedDate">
March 22, 2022 at 1:33 PM </span>
<span class="EditOn">
<a href="https://github.com/RSS-Bridge/rss-bridge/tree/master/docs/07_Cache_API/01_How_to_create_a_new_cache.md" target="_blank">
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<p>Create a new file in the <code>caches/</code> folder (see <a href="../For_Developers/Folder_structure.html">Folder structure</a>).</p>
<p>The file must be named according to following specification:</p>
<ul>
<li>It starts with the type</li>
<li>The file name must end with Cache</li>
<li>The file type must be PHP, written in small letters (seriously!) “.php”</li>
</ul>
<p><strong>Examples:</strong></p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Filename</th>
</tr>
</thead>
<tbody>
<tr>
<td>File</td>
<td>FileCache.php</td>
</tr>
<tr>
<td>MySQL</td>
<td>MySQLCache.php</td>
</tr>
</tbody>
</table>
<p>The file must start with the PHP tags and end with an empty line. The closing tag <code>?&gt;</code> is <a href="http://php.net/basic-syntax.instruction-separation" class="Link--external" rel="noopener noreferrer">omitted</a>.</p>
<p>Example:</p>
<pre><code class="language-PHP">&lt;?PHP
// PHP code here
// This line is empty (just imagine it!)
</code></pre>
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<!DOCTYPE html>
<html class="no-js" lang="en">
<head>
<title>Cache API - RSS-Bridge</title>
<meta name="description" content="The RSS feed for websites missing it">
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<h1><a href="../Cache_API/index.html">Cache API</a></h1>
<span class="ModifiedDate">
March 22, 2022 at 1:33 PM </span>
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Edit on GitHub </a>
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<p>A <em>Cache</em> is a class that allows <strong>RSS-Bridge</strong> to store fetched data in a local storage area on the server. Cache imlementations are placed in the <code>caches/</code> folder (see <a href="../For_Developers/Folder_structure.html">Folder structure</a>). A cache must implement the <a href="CacheInterface.html"><code>CacheInterface</code></a> interface.</p>
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