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<div class="section" id="events">
<h1>Events<a class="headerlink" href="#events" title="Permalink to this headline">¶</a></h1>
<p>Doctrine features a lightweight event system that is part of the
Common package.</p>
<div class="section" id="the-event-system">
<h2>The Event System<a class="headerlink" href="#the-event-system" title="Permalink to this headline">¶</a></h2>
<p>The event system is controlled by the <code class="docutils literal"><span class="pre">EventManager</span></code>. It is the
central point of Doctrine's event listener system. Listeners are
registered on the manager and events are dispatched through the
manager.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventManager</span><span class="p">();</span>
</pre></div>
</div>
<p>Now we can add some event listeners to the <code class="docutils literal"><span class="pre">$evm</span></code>. Let's create a
<code class="docutils literal"><span class="pre">EventTest</span></code> class to play around with.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">const</span> <span class="no">preFoo</span> <span class="o">=</span> <span class="s1">'preFoo'</span><span class="p">;</span>
<span class="k">const</span> <span class="no">postFoo</span> <span class="o">=</span> <span class="s1">'postFoo'</span><span class="p">;</span>
<span class="k">private</span> <span class="nv">$_evm</span><span class="p">;</span>
<span class="k">public</span> <span class="nv">$preFooInvoked</span> <span class="o">=</span> <span class="k">false</span><span class="p">;</span>
<span class="k">public</span> <span class="nv">$postFooInvoked</span> <span class="o">=</span> <span class="k">false</span><span class="p">;</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">(</span><span class="nv">$evm</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="nx">self</span><span class="o">::</span><span class="na">preFoo</span><span class="p">,</span> <span class="nx">self</span><span class="o">::</span><span class="na">postFoo</span><span class="p">),</span> <span class="nv">$this</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">preFoo</span><span class="p">(</span><span class="nx">EventArgs</span> <span class="nv">$e</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">preFooInvoked</span> <span class="o">=</span> <span class="k">true</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">postFoo</span><span class="p">(</span><span class="nx">EventArgs</span> <span class="nv">$e</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">postFooInvoked</span> <span class="o">=</span> <span class="k">true</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="c1">// Create a new instance</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">(</span><span class="nv">$evm</span><span class="p">);</span>
</pre></div>
</div>
<p>Events can be dispatched by using the <code class="docutils literal"><span class="pre">dispatchEvent()</span></code> method.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">dispatchEvent</span><span class="p">(</span><span class="nx">EventTest</span><span class="o">::</span><span class="na">preFoo</span><span class="p">);</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">dispatchEvent</span><span class="p">(</span><span class="nx">EventTest</span><span class="o">::</span><span class="na">postFoo</span><span class="p">);</span>
</pre></div>
</div>
<p>You can easily remove a listener with the <code class="docutils literal"><span class="pre">removeEventListener()</span></code>
method.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">removeEventListener</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="nx">self</span><span class="o">::</span><span class="na">preFoo</span><span class="p">,</span> <span class="nx">self</span><span class="o">::</span><span class="na">postFoo</span><span class="p">),</span> <span class="nv">$this</span><span class="p">);</span>
</pre></div>
</div>
<p>The Doctrine event system also has a simple concept of event
subscribers. We can define a simple <code class="docutils literal"><span class="pre">TestEventSubscriber</span></code> class
which implements the <code class="docutils literal"><span class="pre">\Doctrine\Common\EventSubscriber</span></code> interface
and implements a <code class="docutils literal"><span class="pre">getSubscribedEvents()</span></code> method which returns an
array of events it should be subscribed to.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">TestEventSubscriber</span> <span class="k">implements</span> <span class="nx">\Doctrine\Common\EventSubscriber</span>
<span class="p">{</span>
<span class="k">const</span> <span class="no">preFoo</span> <span class="o">=</span> <span class="s1">'preFoo'</span><span class="p">;</span>
<span class="k">public</span> <span class="nv">$preFooInvoked</span> <span class="o">=</span> <span class="k">false</span><span class="p">;</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">preFoo</span><span class="p">()</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">preFooInvoked</span> <span class="o">=</span> <span class="k">true</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">getSubscribedEvents</span><span class="p">()</span>
<span class="p">{</span>
<span class="k">return</span> <span class="k">array</span><span class="p">(</span><span class="nx">self</span><span class="o">::</span><span class="na">preFoo</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="nv">$eventSubscriber</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">TestEventSubscriber</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventSubscriber</span><span class="p">(</span><span class="nv">$eventSubscriber</span><span class="p">);</span>
</pre></div>
</div>
<p>Now when you dispatch an event any event subscribers will be
notified for that event.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">dispatchEvent</span><span class="p">(</span><span class="nx">TestEventSubscriber</span><span class="o">::</span><span class="na">preFoo</span><span class="p">);</span>
</pre></div>
</div>
<p>Now test the <code class="docutils literal"><span class="pre">$eventSubscriber</span></code> instance to see if the
<code class="docutils literal"><span class="pre">preFoo()</span></code> method was invoked.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">if</span> <span class="p">(</span><span class="nv">$eventSubscriber</span><span class="o">-></span><span class="na">preFooInvoked</span><span class="p">)</span> <span class="p">{</span>
<span class="k">echo</span> <span class="s1">'pre foo invoked!'</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="lifecycle-events">
<span id="id1"></span><h2>Lifecycle Events<a class="headerlink" href="#lifecycle-events" title="Permalink to this headline">¶</a></h2>
<p>The DocumentManager and UnitOfWork trigger several events during
the life-time of their registered documents.</p>
<ul class="simple">
<li>preRemove - The preRemove event occurs for a given document before
the respective DocumentManager remove operation for that document
is executed.</li>
<li>postRemove - The postRemove event occurs for a document after the
document has been removed. It will be invoked after the database
delete operations.</li>
<li>prePersist - The prePersist event occurs for a given document
before the respective DocumentManager persist operation for that
document is executed.</li>
<li>postPersist - The postPersist event occurs for a document after
the document has been made persistent. It will be invoked after the
database insert operations. Generated primary key values are
available in the postPersist event.</li>
<li>preUpdate - The preUpdate event occurs before the database update
operations to document data.</li>
<li>postUpdate - The postUpdate event occurs after the database update
operations to document data.</li>
<li>preLoad - The preLoad event occurs for a document before the
document has been loaded into the current DocumentManager from the
database or after the refresh operation has been applied to it.</li>
<li>postLoad - The postLoad event occurs for a document after the
document has been loaded into the current DocumentManager from the
database or after the refresh operation has been applied to it.</li>
<li>loadClassMetadata - The loadClassMetadata event occurs after the
mapping metadata for a class has been loaded from a mapping source
(annotations/xml/yaml).</li>
<li>preFlush - The preFlush event occurs before the change-sets of all
managed documents are computed. This both a lifecycle call back and
and listener.</li>
<li>postFlush - The postFlush event occurs after the change-sets of all
managed documents are computed.</li>
<li>onFlush - The onFlush event occurs after the change-sets of all
managed documents are computed. This event is not a lifecycle
callback.</li>
<li>onClear - The onClear event occurs after the UnitOfWork has had
its state cleared.</li>
<li>documentNotFound - The documentNotFound event occurs when a proxy object
could not be initialized. This event is not a lifecycle callback.</li>
<li>postCollectionLoad - The postCollectionLoad event occurs just after
collection has been initialized (loaded) and before new elements
are re-added to it.</li>
</ul>
<p>You can access the Event constants from the <code class="docutils literal"><span class="pre">Events</span></code> class in the
ODM package.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">use</span> <span class="nx">Doctrine\ODM\MongoDB\Events</span><span class="p">;</span>
<span class="k">echo</span> <span class="nx">Events</span><span class="o">::</span><span class="na">preUpdate</span><span class="p">;</span>
</pre></div>
</div>
<p>These can be hooked into by two different types of event
listeners:</p>
<ul class="simple">
<li>Lifecycle Callbacks are methods on the document classes that are
called when the event is triggered. They receive instances
of <code class="docutils literal"><span class="pre">Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span></code> (see relevant
examples below) as arguments and are specifically designed to allow
changes inside the document classes state.</li>
<li>Lifecycle Event Listeners are classes with specific callback
methods that receives some kind of <code class="docutils literal"><span class="pre">EventArgs</span></code> instance which
give access to the document, DocumentManager or other relevant
data.</li>
</ul>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">All Lifecycle events that happen during the <code class="docutils literal"><span class="pre">flush()</span></code> of
a DocumentManager have very specific constraints on the allowed
operations that can be executed. Please read the
<em>Implementing Event Listeners</em> section very carefully to understand
which operations are allowed in which lifecycle event.</p>
</div>
</div>
<div class="section" id="lifecycle-callbacks">
<h2>Lifecycle Callbacks<a class="headerlink" href="#lifecycle-callbacks" title="Permalink to this headline">¶</a></h2>
<p>A lifecycle event is a regular event with the additional feature of
providing a mechanism to register direct callbacks inside the
corresponding document classes that are executed when the lifecycle
event occurs.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="sd">/** @Document @HasLifecycleCallbacks */</span>
<span class="k">class</span> <span class="nc">User</span>
<span class="p">{</span>
<span class="c1">// ...</span>
<span class="sd">/**</span>
<span class="sd"> * @Field</span>
<span class="sd"> */</span>
<span class="k">public</span> <span class="nv">$value</span><span class="p">;</span>
<span class="sd">/** @Field */</span>
<span class="k">private</span> <span class="nv">$createdAt</span><span class="p">;</span>
<span class="sd">/** @PrePersist */</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">doStuffOnPrePersist</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">createdAt</span> <span class="o">=</span> <span class="nb">date</span><span class="p">(</span><span class="s1">'Y-m-d H:i:s'</span><span class="p">);</span>
<span class="p">}</span>
<span class="sd">/** @PrePersist */</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">doOtherStuffOnPrePersist</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">value</span> <span class="o">=</span> <span class="s1">'changed from prePersist callback!'</span><span class="p">;</span>
<span class="p">}</span>
<span class="sd">/** @PostPersist */</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">doStuffOnPostPersist</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">value</span> <span class="o">=</span> <span class="s1">'changed from postPersist callback!'</span><span class="p">;</span>
<span class="p">}</span>
<span class="sd">/** @PreLoad */</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">doStuffOnPreLoad</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\PreLoadEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$data</span> <span class="o">=&</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getData</span><span class="p">();</span>
<span class="nv">$data</span><span class="p">[</span><span class="s1">'value'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'changed from preLoad callback'</span><span class="p">;</span>
<span class="p">}</span>
<span class="sd">/** @PostLoad */</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">doStuffOnPostLoad</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">value</span> <span class="o">=</span> <span class="s1">'changed from postLoad callback!'</span><span class="p">;</span>
<span class="p">}</span>
<span class="sd">/** @PreUpdate */</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">doStuffOnPreUpdate</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\PreUpdateEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">value</span> <span class="o">=</span> <span class="s1">'changed from preUpdate callback!'</span><span class="p">;</span>
<span class="p">}</span>
<span class="sd">/** @PreFlush */</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">preFlush</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\PreFlushEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">value</span> <span class="o">=</span> <span class="s1">'changed from preFlush callback!'</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Note that when using annotations you have to apply the
@HasLifecycleCallbacks marker annotation on the document class.</p>
</div>
<div class="section" id="listening-to-lifecycle-events">
<h2>Listening to Lifecycle Events<a class="headerlink" href="#listening-to-lifecycle-events" title="Permalink to this headline">¶</a></h2>
<p>Lifecycle event listeners are much more powerful than the simple
lifecycle callbacks that are defined on the document classes. They
allow to implement re-usable behaviours between different document
classes, yet require much more detailed knowledge about the inner
workings of the DocumentManager and UnitOfWork. Please read the
<em>Implementing Event Listeners</em> section carefully if you are trying
to write your own listener.</p>
<p>To register an event listener you have to hook it into the
EventManager that is passed to the DocumentManager factory:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$eventManager</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventManager</span><span class="p">();</span>
<span class="nv">$eventManager</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">preUpdate</span><span class="p">),</span> <span class="k">new</span> <span class="nx">MyEventListener</span><span class="p">());</span>
<span class="nv">$eventManager</span><span class="o">-></span><span class="na">addEventSubscriber</span><span class="p">(</span><span class="k">new</span> <span class="nx">MyEventSubscriber</span><span class="p">());</span>
<span class="nv">$documentManager</span> <span class="o">=</span> <span class="nx">DocumentManager</span><span class="o">::</span><span class="na">create</span><span class="p">(</span><span class="nv">$mongo</span><span class="p">,</span> <span class="nv">$config</span><span class="p">,</span> <span class="nv">$eventManager</span><span class="p">);</span>
</pre></div>
</div>
<p>You can also retrieve the event manager instance after the
DocumentManager was created:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$documentManager</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">()</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">preUpdate</span><span class="p">),</span> <span class="k">new</span> <span class="nx">MyEventListener</span><span class="p">());</span>
<span class="nv">$documentManager</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">()</span><span class="o">-></span><span class="na">addEventSubscriber</span><span class="p">(</span><span class="k">new</span> <span class="nx">MyEventSubscriber</span><span class="p">());</span>
</pre></div>
</div>
</div>
<div class="section" id="implementing-event-listeners">
<h2>Implementing Event Listeners<a class="headerlink" href="#implementing-event-listeners" title="Permalink to this headline">¶</a></h2>
<p>This section explains what is and what is not allowed during
specific lifecycle events of the UnitOfWork. Although you get
passed the DocumentManager in all of these events, you have to
follow this restrictions very carefully since operations in the
wrong event may produce lots of different errors, such as
inconsistent data and lost updates/persists/removes.</p>
<div class="section" id="prepersist">
<h3>prePersist<a class="headerlink" href="#prepersist" title="Permalink to this headline">¶</a></h3>
<p>Listen to the <code class="docutils literal"><span class="pre">prePersist</span></code> event:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">prePersist</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">prePersist</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$document</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getDocument</span><span class="p">();</span>
<span class="nv">$document</span><span class="o">-></span><span class="na">setSomething</span><span class="p">();</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="preload">
<h3>preLoad<a class="headerlink" href="#preload" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">preLoad</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class with a <code class="docutils literal"><span class="pre">preLoad()</span></code> method:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">preLoad</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\PreLoadEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$data</span> <span class="o">=&</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getData</span><span class="p">();</span>
<span class="c1">// do something</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="postload">
<h3>postLoad<a class="headerlink" href="#postload" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">postLoad</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class with a <code class="docutils literal"><span class="pre">postLoad()</span></code> method:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">postLoad</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$document</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getDocument</span><span class="p">();</span>
<span class="c1">// do something</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="preremove">
<h3>preRemove<a class="headerlink" href="#preremove" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">preRemove</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class with a <code class="docutils literal"><span class="pre">preRemove()</span></code> method:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">preRemove</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$document</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getDocument</span><span class="p">();</span>
<span class="c1">// do something</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="preflush">
<h3>preFlush<a class="headerlink" href="#preflush" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">preFlush</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class with a <code class="docutils literal"><span class="pre">preFlush()</span></code> method:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">preFlush</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\PreFlushEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$dm</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getDocumentManager</span><span class="p">();</span>
<span class="nv">$uow</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getUnitOfWork</span><span class="p">();</span>
<span class="c1">// do something</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="onflush">
<h3>onFlush<a class="headerlink" href="#onflush" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">onFlush</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class with a <code class="docutils literal"><span class="pre">onFlush()</span></code> method:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">onFlush</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\OnFlushEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$dm</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getDocumentManager</span><span class="p">();</span>
<span class="nv">$uow</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getUnitOfWork</span><span class="p">();</span>
<span class="c1">// do something</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="postflush">
<h3>postFlush<a class="headerlink" href="#postflush" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">postFlush</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class with a <code class="docutils literal"><span class="pre">postFlush()</span></code> method:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">postFlush</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\PostFlushEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$dm</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getDocumentManager</span><span class="p">();</span>
<span class="nv">$uow</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getUnitOfWork</span><span class="p">();</span>
<span class="c1">// do something</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="preupdate">
<h3>preUpdate<a class="headerlink" href="#preupdate" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">preUpdate</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class with a <code class="docutils literal"><span class="pre">preUpdate()</span></code> method:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">preUpdate</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$document</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getDocument</span><span class="p">();</span>
<span class="nv">$document</span><span class="o">-></span><span class="na">setSomething</span><span class="p">();</span>
<span class="nv">$dm</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getDocumentManager</span><span class="p">();</span>
<span class="nv">$class</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getClassMetadata</span><span class="p">(</span><span class="nb">get_class</span><span class="p">(</span><span class="nv">$document</span><span class="p">));</span>
<span class="nv">$dm</span><span class="o">-></span><span class="na">getUnitOfWork</span><span class="p">()</span><span class="o">-></span><span class="na">recomputeSingleDocumentChangeSet</span><span class="p">(</span><span class="nv">$class</span><span class="p">,</span> <span class="nv">$document</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If you modify a document in the preUpdate event you must call <code class="docutils literal"><span class="pre">recomputeSingleDocumentChangeSet</span></code>
for the modified document in order for the changes to be persisted.</p>
</div>
</div>
<div class="section" id="onclear">
<h3>onClear<a class="headerlink" href="#onclear" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">onClear</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class with a <code class="docutils literal"><span class="pre">onClear()</span></code> method:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">onClear</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\OnClearEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$class</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getDocumentClass</span><span class="p">();</span>
<span class="nv">$dm</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getDocumentManager</span><span class="p">();</span>
<span class="nv">$uow</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getUnitOfWork</span><span class="p">();</span>
<span class="c1">// Check if event clears all documents.</span>
<span class="k">if</span> <span class="p">(</span><span class="nv">$eventArgs</span><span class="o">-></span><span class="na">clearsAllDocuments</span><span class="p">())</span> <span class="p">{</span>
<span class="c1">// do something</span>
<span class="p">}</span>
<span class="c1">// do something</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="documentnotfound">
<h3>documentNotFound<a class="headerlink" href="#documentnotfound" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">documentNotFound</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class with a <code class="docutils literal"><span class="pre">documentNotFound()</span></code> method:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">documentNotFound</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\DocumentNotFoundEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$proxy</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getObject</span><span class="p">();</span>
<span class="nv">$identifier</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getIdentifier</span><span class="p">();</span>
<span class="c1">// do something</span>
<span class="c1">// To prevent the documentNotFound exception from being thrown, call the disableException() method:</span>
<span class="nv">$eventArgs</span><span class="o">-></span><span class="na">disableException</span><span class="p">();</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="postupdate-postremove-postpersist">
<h3>postUpdate, postRemove, postPersist<a class="headerlink" href="#postupdate-postremove-postpersist" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">postUpdate</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">postRemove</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">postPersist</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class with a <code class="docutils literal"><span class="pre">postUpdate()</span></code>, <code class="docutils literal"><span class="pre">postRemove()</span></code> and <code class="docutils literal"><span class="pre">postPersist()</span></code> method:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">postUpdate</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">postRemove</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">postPersist</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LifecycleEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="postcollectionload">
<h3>postCollectionLoad<a class="headerlink" href="#postcollectionload" title="Permalink to this headline">¶</a></h3>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This event was introduced in version 1.1</p>
</div>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">postCollectionLoad</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
</pre></div>
</div>
<p>Define the <code class="docutils literal"><span class="pre">EventTest</span></code> class with a <code class="docutils literal"><span class="pre">postCollectionLoad()</span></code> method:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">postCollectionLoad</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\PostCollectionLoadEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$collection</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getCollection</span><span class="p">();</span>
<span class="k">if</span> <span class="p">(</span><span class="nv">$collection</span> <span class="nx">instanceof</span> <span class="nx">\Malarzm\Collections\DiffableCollection</span><span class="p">)</span> <span class="p">{</span>
<span class="nv">$collection</span><span class="o">-></span><span class="na">snapshot</span><span class="p">();</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="load-classmetadata-event">
<h2>Load ClassMetadata Event<a class="headerlink" href="#load-classmetadata-event" title="Permalink to this headline">¶</a></h2>
<p>When the mapping information for a document is read, it is
populated in to a <code class="docutils literal"><span class="pre">ClassMetadata</span></code> instance. You can hook in to
this process and manipulate the instance with the <code class="docutils literal"><span class="pre">loadClassMetadata</span></code> event:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp"><?php</span>
<span class="nv">$test</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventTest</span><span class="p">();</span>
<span class="nv">$metadataFactory</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getMetadataFactory</span><span class="p">();</span>
<span class="nv">$evm</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-></span><span class="na">getEventManager</span><span class="p">();</span>
<span class="nv">$evm</span><span class="o">-></span><span class="na">addEventListener</span><span class="p">(</span><span class="nx">Events</span><span class="o">::</span><span class="na">loadClassMetadata</span><span class="p">,</span> <span class="nv">$test</span><span class="p">);</span>
<span class="k">class</span> <span class="nc">EventTest</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">loadClassMetadata</span><span class="p">(</span><span class="nx">\Doctrine\ODM\MongoDB\Event\LoadClassMetadataEventArgs</span> <span class="nv">$eventArgs</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$classMetadata</span> <span class="o">=</span> <span class="nv">$eventArgs</span><span class="o">-></span><span class="na">getClassMetadata</span><span class="p">();</span>
<span class="nv">$fieldMapping</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
<span class="s1">'fieldName'</span> <span class="o">=></span> <span class="s1">'about'</span><span class="p">,</span>
<span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'string'</span>
<span class="p">);</span>
<span class="nv">$classMetadata</span><span class="o">-></span><span class="na">mapField</span><span class="p">(</span><span class="nv">$fieldMapping</span><span class="p">);</span>
<span class="p">}</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="#">Events</a><ul>
<li><a class="reference internal" href="#the-event-system">The Event System</a></li>
<li><a class="reference internal" href="#lifecycle-events">Lifecycle Events</a></li>
<li><a class="reference internal" href="#lifecycle-callbacks">Lifecycle Callbacks</a></li>
<li><a class="reference internal" href="#listening-to-lifecycle-events">Listening to Lifecycle Events</a></li>
<li><a class="reference internal" href="#implementing-event-listeners">Implementing Event Listeners</a><ul>
<li><a class="reference internal" href="#prepersist">prePersist</a></li>
<li><a class="reference internal" href="#preload">preLoad</a></li>
<li><a class="reference internal" href="#postload">postLoad</a></li>
<li><a class="reference internal" href="#preremove">preRemove</a></li>
<li><a class="reference internal" href="#preflush">preFlush</a></li>
<li><a class="reference internal" href="#onflush">onFlush</a></li>
<li><a class="reference internal" href="#postflush">postFlush</a></li>
<li><a class="reference internal" href="#preupdate">preUpdate</a></li>
<li><a class="reference internal" href="#onclear">onClear</a></li>
<li><a class="reference internal" href="#documentnotfound">documentNotFound</a></li>
<li><a class="reference internal" href="#postupdate-postremove-postpersist">postUpdate, postRemove, postPersist</a></li>
<li><a class="reference internal" href="#postcollectionload">postCollectionLoad</a></li>
</ul>
</li>
<li><a class="reference internal" href="#load-classmetadata-event">Load ClassMetadata Event</a></li>
</ul>
</li>
</ul>
<h3>This Page</h3>
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