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<div class="section" id="capped-collections">
<h1>Capped Collections<a class="headerlink" href="#capped-collections" title="Permalink to this headline"></a></h1>
<p>Capped collections are fixed sized collections that have a very
high performance auto-LRU age-out feature (age out is based on
insertion order).</p>
<p>In addition, capped collections automatically, with high
performance, maintain insertion order for the objects in the
collection; this is very powerful for certain use cases such as
logging.</p>
<div class="section" id="mapping">
<h2>Mapping<a class="headerlink" href="#mapping" title="Permalink to this headline"></a></h2>
<p>You can configure the collection in the <code class="docutils literal"><span class="pre">collection</span></code> attribute of
the <code class="docutils literal"><span class="pre">&#64;Document</span></code> annotation:</p>
<div class="configuration-block">
<ul class="simple">
<li><em>PHP</em><div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="sd">/**</span>
<span class="sd"> * @Document(collection={</span>
<span class="sd"> * &quot;name&quot;=&quot;collname&quot;,</span>
<span class="sd"> * &quot;capped&quot;=true,</span>
<span class="sd"> * &quot;size&quot;=100000,</span>
<span class="sd"> * &quot;max&quot;=1000</span>
<span class="sd"> * })</span>
<span class="sd"> */</span>
<span class="k">class</span> <span class="nc">Category</span>
<span class="p">{</span>
<span class="sd">/** @Id */</span>
<span class="k">public</span> <span class="nv">$id</span><span class="p">;</span>
<span class="sd">/** @Field(type=&quot;string&quot;) */</span>
<span class="k">public</span> <span class="nv">$name</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
</li>
<li><em>XML</em><div class="highlight-xml"><div class="highlight"><pre><span class="cp">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span class="nt">&lt;doctrine-mongo-mapping</span> <span class="na">xmlns=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping&quot;</span>
<span class="na">xmlns:xsi=</span><span class="s">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span>
<span class="na">xsi:schemaLocation=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping</span>
<span class="s"> http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;document</span> <span class="na">name=</span><span class="s">&quot;Documents\Category&quot;</span> <span class="na">collection=</span><span class="s">&quot;collname&quot;</span> <span class="na">capped-collection=</span><span class="s">&quot;true&quot;</span> <span class="na">capped-collection-size=</span><span class="s">&quot;100000&quot;</span> <span class="na">capped-collection-max=</span><span class="s">&quot;1000&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;field</span> <span class="na">fieldName=</span><span class="s">&quot;id&quot;</span> <span class="na">id=</span><span class="s">&quot;true&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">fieldName=</span><span class="s">&quot;name&quot;</span> <span class="na">type=</span><span class="s">&quot;string&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/document&gt;</span>
<span class="nt">&lt;/doctrine-mongo-mapping&gt;</span>
</pre></div>
</div>
</li>
<li><em>YAML</em><div class="highlight-yaml"><div class="highlight"><pre><span class="l l-Scalar l-Scalar-Plain">Documents\Category</span><span class="p p-Indicator">:</span>
<span class="l l-Scalar l-Scalar-Plain">type</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">document</span>
<span class="l l-Scalar l-Scalar-Plain">collection</span><span class="p p-Indicator">:</span>
<span class="l l-Scalar l-Scalar-Plain">name</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">collname</span>
<span class="l l-Scalar l-Scalar-Plain">capped</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">true</span>
<span class="l l-Scalar l-Scalar-Plain">size</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">100000</span>
<span class="l l-Scalar l-Scalar-Plain">max</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">1000</span>
<span class="l l-Scalar l-Scalar-Plain">fields</span><span class="p p-Indicator">:</span>
<span class="l l-Scalar l-Scalar-Plain">id</span><span class="p p-Indicator">:</span>
<span class="l l-Scalar l-Scalar-Plain">type</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">id</span>
<span class="l l-Scalar l-Scalar-Plain">id</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">true</span>
<span class="l l-Scalar l-Scalar-Plain">name</span><span class="p p-Indicator">:</span>
<span class="l l-Scalar l-Scalar-Plain">type</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">string</span>
</pre></div>
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</li>
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<div class="section" id="creating">
<h2>Creating<a class="headerlink" href="#creating" title="Permalink to this headline"></a></h2>
<p>Remember that you must manually create the collections. If you let
MongoDB create the collection lazily the first time it is selected,
it will not be created with the capped configuration. You can
create the collection for a document with the <code class="docutils literal"><span class="pre">SchemaManager</span></code>
that can be acquired from your <code class="docutils literal"><span class="pre">DocumentManager</span></code> instance:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="nv">$documentManager</span><span class="o">-&gt;</span><span class="na">getSchemaManager</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">createDocumentCollection</span><span class="p">(</span><span class="s1">&#39;Category&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>You can drop the collection too if it already exists:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="nv">$documentManager</span><span class="o">-&gt;</span><span class="na">getSchemaManager</span><span class="p">()</span><span class="o">-&gt;</span><span class="na">dropDocumentCollection</span><span class="p">(</span><span class="s1">&#39;Category&#39;</span><span class="p">);</span>
</pre></div>
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<h3><a href="../index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Capped Collections</a><ul>
<li><a class="reference internal" href="#mapping">Mapping</a></li>
<li><a class="reference internal" href="#creating">Creating</a></li>
</ul>
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