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    IRuntimeCache
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                  <a href="https://github.com/WoltLab/docs.woltlab.com/edit/5.4/docs/php/api/caches_runtime-caches.md" title="Edit this page" class="md-content__button md-icon">
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                <h1 id="runtime-caches">Runtime Caches<a class="headerlink" href="#runtime-caches" title="Permanent link">#</a></h1>
<p>Runtime caches store objects created during the runtime of the script and are automatically discarded after the script terminates.
Runtime caches are especially useful when objects are fetched by different APIs, each requiring separate requests.
By using a runtime cache, you have two advantages:</p>
<ol>
<li>If the API allows it, you can delay fetching the actual objects and initially only tell the runtime cache that at some point in the future of the current request, you need the objects with the given ids.
   If multiple APIs do this one after another, all objects can be fetched using only one query instead of each API querying the database on its own.</li>
<li>If an object with the same ID has already been fetched from database, this object is simply returned and can be reused instead of being fetched from database again.</li>
</ol>
<h2 id="iruntimecache"><code>IRuntimeCache</code><a class="headerlink" href="#iruntimecache" title="Permanent link">#</a></h2>
<p>Every runtime cache has to implement the <a href="https://github.com/WoltLab/WCF/blob/master/wcfsetup/install/files/lib/system/cache/runtime/IRuntimeCache.class.php">IRuntimeCache</a> interface.
It is recommended, however, that you extend <a href="https://github.com/WoltLab/WCF/blob/master/wcfsetup/install/files/lib/system/cache/runtime/AbstractRuntimeCache.class.php">AbstractRuntimeCache</a>, the default implementation of the runtime cache interface.
In most instances, you only need to set the <code>AbstractRuntimeCache::$listClassName</code> property to the name of database object list class which fetches the cached objects from database (see <a href="#example">example</a>).</p>
<h2 id="usage">Usage<a class="headerlink" href="#usage" title="Permanent link">#</a></h2>
<div class="highlight"><pre><span></span><code><span class="o">&lt;?</span><span class="nx">php</span>
<span class="k">use</span> <span class="nx">wcf\system\cache\runtime\UserRuntimeCache</span><span class="p">;</span>

<span class="nv">$userIDs</span> <span class="o">=</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">];</span>

<span class="c1">// first (optional) step: tell runtime cache to remember user ids</span>
<span class="nx">UserRuntimeCache</span><span class="o">::</span><span class="na">getInstance</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">cacheObjectIDs</span><span class="p">(</span><span class="nv">$userIDs</span><span class="p">);</span>

<span class="c1">// […]</span>

<span class="c1">// second step: fetch the objects from database</span>
<span class="nv">$users</span> <span class="o">=</span> <span class="nx">UserRuntimeCache</span><span class="o">::</span><span class="na">getInstance</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">getObjects</span><span class="p">(</span><span class="nv">$userIDs</span><span class="p">);</span>

<span class="c1">// somewhere else: fetch only one user</span>
<span class="nv">$userID</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span>

<span class="nx">UserRuntimeCache</span><span class="o">::</span><span class="na">getInstance</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">cacheObjectID</span><span class="p">(</span><span class="nv">$userID</span><span class="p">);</span>

<span class="c1">// […]</span>

<span class="c1">// get user without the cache actually fetching it from database because it has already been loaded</span>
<span class="nv">$user</span> <span class="o">=</span> <span class="nx">UserRuntimeCache</span><span class="o">::</span><span class="na">getInstance</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">getObject</span><span class="p">(</span><span class="nv">$userID</span><span class="p">);</span>

<span class="c1">// somewhere else: fetch users directly without caching user ids first</span>
<span class="nv">$users</span> <span class="o">=</span> <span class="nx">UserRuntimeCache</span><span class="o">::</span><span class="na">getInstance</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">getObjects</span><span class="p">([</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">]);</span>
</code></pre></div>
<h2 id="example">Example<a class="headerlink" href="#example" title="Permanent link">#</a></h2>
<div class="highlight"><pre><span></span><code><span class="o">&lt;?</span><span class="nx">php</span>
<span class="k">namespace</span> <span class="nx">wcf\system\cache\runtime</span><span class="p">;</span>
<span class="k">use</span> <span class="nx">wcf\data\user\User</span><span class="p">;</span>
<span class="k">use</span> <span class="nx">wcf\data\user\UserList</span><span class="p">;</span>

<span class="sd">/**</span>
<span class="sd"> * Runtime cache implementation for users.</span>
<span class="sd"> *</span>
<span class="sd"> * @author  Matthias Schmidt</span>
<span class="sd"> * @copyright   2001-2016 WoltLab GmbH</span>
<span class="sd"> * @license GNU Lesser General Public License &lt;http://opensource.org/licenses/lgpl-license.php&gt;</span>
<span class="sd"> * @package WoltLabSuite\Core\System\Cache\Runtime</span>
<span class="sd"> * @since   3.0</span>
<span class="sd"> * </span>
<span class="sd"> * @method  User[]      getCachedObjects()</span>
<span class="sd"> * @method  User        getObject($objectID)</span>
<span class="sd"> * @method  User[]      getObjects(array $objectIDs)</span>
<span class="sd"> */</span>
<span class="k">class</span> <span class="nc">UserRuntimeCache</span> <span class="k">extends</span> <span class="nx">AbstractRuntimeCache</span> <span class="p">{</span>
    <span class="sd">/**</span>
<span class="sd">     * @inheritDoc</span>
<span class="sd">     */</span>
    <span class="k">protected</span> <span class="nv">$listClassName</span> <span class="o">=</span> <span class="nx">UserList</span><span class="o">::</span><span class="na">class</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
                
                  
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