The EventDispatcher Component (Symfony Docs)

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class="breadcrumb-item text-truncate"> <a href="/doc/current/index.html" class="ui-link-muted">Documentation</a> </li> <li class="breadcrumb-item text-truncate active" aria-current="page"> The EventDispatcher Component </li> </ol> </div> </nav> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"\/","name":"Home"}},{"@type":"ListItem","position":2,"item":{"@id":"\/doc\/current\/index.html","name":"Documentation"}},{"@type":"ListItem","position":3,"item":{"@id":"\/doc\/current\/components\/event_dispatcher.html","name":"The EventDispatcher Component"}}]}</script> <main id="main-content" class="ui-page-main-content "> <div class="ui-page-container ui-page-container-wide"> <div class="ui-page-grid-content-left-sidebar-right-sidebar"> <aside class="sidebar sidebar-left"> <div class="ui-sidebar-content-sticky"> <div class="doc-sidebar-search mt-2 mb-3"> <button type="button" class="form-search-input-button d-flex flex-fill align-items-center flex-nowrap w-100 rounded-5 ui-border-primary ui-text-muted ui-text-sm px-2 py-1 ui-hover-outline-link ui-cursor-pointer"> <svg width="1em" height="1em" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true" class="me-2"><path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 10a7 7 0 1 0 14 0a7 7 0 1 0-14 0m18 11l-6-6"></path></svg> Search Symfony Docs </button> </div> <div class="doc-action doc-alternative-selector branch-selector"> <span class="label">Version:</span> <select class="form-select ui-text-sm"> <optgroup label="Maintained Versions"> <option data-url="https://symfony.com/doc/7.3/components/event_dispatcher.html"> 7.3 (dev) </option> <option data-url="https://symfony.com/doc/7.2/components/event_dispatcher.html"> 7.2 </option> <option selected data-url="https://symfony.com/doc/current/components/event_dispatcher.html"> 7.1 (current) </option> <option data-url="https://symfony.com/doc/6.4/components/event_dispatcher.html"> 6.4 </option> <option data-url="https://symfony.com/doc/5.x/components/event_dispatcher.html"> 5.x </option> </optgroup> <optgroup label="Unmaintained Versions"> <option data-url="https://symfony.com/doc/7.0/components/event_dispatcher.html"> 7.0 </option> <option data-url="https://symfony.com/doc/6.3/components/event_dispatcher.html"> 6.3 </option> <option data-url="https://symfony.com/doc/6.2/components/event_dispatcher.html"> 6.2 </option> <option data-url="https://symfony.com/doc/6.1/components/event_dispatcher.html"> 6.1 </option> <option data-url="https://symfony.com/doc/6.0/components/event_dispatcher.html"> 6.0 </option> <option data-url="https://symfony.com/doc/4.x/components/event_dispatcher.html"> 4.x </option> <option data-url="https://symfony.com/doc/3.x/components/event_dispatcher.html"> 3.x </option> <option data-url="https://symfony.com/doc/2.x/components/event_dispatcher.html"> 2.x </option> </optgroup> </select> </div> <div class="doc-sidebar-menu"> <div class="toctree-wrapper toctree-programmatic toctree-size-lg"> <p class="toctree-title">Table of Contents</p> <ul class="toctree toctree-level-1 toctree-length-5"> <li> <a href="#introduction">Introduction</a> </li> <li> <a href="#installation">Installation</a> </li> <li> <a href="#usage">Usage</a> <ul class="toctree toctree-level-2 toctree-length-8"> <li> <a href="#events">Events</a> </li> <li> <a href="#the-dispatcher">The Dispatcher</a> </li> <li> <a href="#connecting-listeners">Connecting Listeners</a> </li> <li> <a href="#creating-and-dispatching-an-event">Creating and Dispatching an Event</a> </li> <li> <a href="#using-event-subscribers">Using Event Subscribers</a> </li> <li> <a href="#stopping-event-flow-propagation">Stopping Event Flow/Propagation</a> </li> <li> <a href="#eventdispatcher-aware-events-and-listeners">EventDispatcher Aware Events and Listeners</a> </li> <li> <a href="#event-name-introspection">Event Name Introspection</a> </li> </ul> </li> <li> <a href="#other-dispatchers">Other Dispatchers</a> </li> <li> <a href="#learn-more">Learn More</a> </li> </ul> </div> </div> </div> </aside> <article class="content" lang="en"> <div class="ui-heading"> <h1 id="the-eventdispatcher-component" class="ui-heading-title"> The EventDispatcher Component </h1> </div> <a class="doc-action content-edit ui-link-muted mb-2" href="https://github.com/symfony/symfony-docs/edit/7.1/components/event_dispatcher.rst"> <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" height="18" stroke="currentColor"> <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z" /> </svg> Edit this page </a> <div class="ui-prose"> <div class="section"> <blockquote><p>The EventDispatcher component provides tools that allow your application components to communicate with each other by dispatching events and listening to them.</p> </blockquote> <div class="section"> <h2 id="introduction"><a class="headerlink" href="#introduction" title="Permalink to this headline">Introduction</a></h2> <p>Object-oriented code has gone a long way to ensuring code extensibility. By creating classes that have well-defined responsibilities, your code becomes more flexible and a developer can extend them with subclasses to modify their behaviors. But if they want to share the changes with other developers who have also made their own subclasses, code inheritance is no longer the answer.</p> <p>Consider the real-world example where you want to provide a plugin system for your project. A plugin should be able to add methods, or do something before or after a method is executed, without interfering with other plugins. This is not an easy problem to solve with single inheritance, and even if multiple inheritance was possible with PHP, it comes with its own drawbacks.</p> <p>The Symfony EventDispatcher component implements the <a href="https://en.wikipedia.org/wiki/Mediator_pattern" class="reference external" rel="external noopener noreferrer" target="_blank">Mediator</a> and <a href="https://en.wikipedia.org/wiki/Observer_pattern" class="reference external" rel="external noopener noreferrer" target="_blank">Observer</a> design patterns to make all these things possible and to make your projects truly extensible.</p> <p>Take an example from <a href="http_kernel.html" class="reference internal">the HttpKernel component</a>. Once a <code translate="no" class="notranslate">Response</code> object has been created, it may be useful to allow other elements in the system to modify it (e.g. add some cache headers) before it's actually used. To make this possible, the Symfony kernel dispatches an event - <code translate="no" class="notranslate">kernel.response</code>. Here's how it works:</p> <ul> <li>A <em>listener</em> (PHP object) tells a central <em>dispatcher</em> object that it wants to listen to the <code translate="no" class="notranslate">kernel.response</code> event;</li> <li>At some point, the Symfony kernel tells the <em>dispatcher</em> object to dispatch the <code translate="no" class="notranslate">kernel.response</code> event, passing with it an <code translate="no" class="notranslate">Event</code> object that has access to the <code translate="no" class="notranslate">Response</code> object;</li> <li>The dispatcher notifies (i.e. calls a method on) all listeners of the <code translate="no" class="notranslate">kernel.response</code> event, allowing each of them to make modifications to the <code translate="no" class="notranslate">Response</code> object.</li> </ul> </div> <div class="section"> <h2 id="installation"><a class="headerlink" href="#installation" title="Permalink to this headline">Installation</a></h2> <div translate="no" data-loc="1" class="notranslate codeblock codeblock-length-sm codeblock-terminal codeblock-bash"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1</pre> <pre class="codeblock-code"><code><span class="hljs-prompt">$ </span>composer require symfony/event-dispatcher</code></pre> </div> </div> <div class="admonition admonition-note "> <p class="admonition-title"> <svg fill="none" width="24" height="24" viewbox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"></path></svg> <span>Note</span> </p><p>If you install this component outside of a Symfony application, you must require the <code translate="no" class="notranslate">vendor/autoload.php</code> file in your code to enable the class autoloading mechanism provided by Composer. Read <a href="using_components.html" class="reference internal">this article</a> for more details.</p> </div> </div> <div class="section"> <h2 id="usage"><a class="headerlink" href="#usage" title="Permalink to this headline">Usage</a></h2> <div class="admonition admonition-seealso "> <p class="admonition-title"> <svg fill="none" width="24" height="24" viewbox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13.828 10.172a4 4 0 00-5.656 0l-4 4a4 4 0 105.656 5.656l1.102-1.101m-.758-4.899a4 4 0 005.656 0l4-4a4 4 0 00-5.656-5.656l-1.1 1.1"></path></svg> <span>See also</span> </p><p>This article explains how to use the EventDispatcher features as an independent component in any PHP application. Read the <a href="../event_dispatcher.html" class="reference internal">Events and Event Listeners</a> article to learn about how to use it in Symfony applications.</p> </div> <div class="section"> <h3 id="events"><a class="headerlink" href="#events" title="Permalink to this headline">Events</a></h3> <p>When an event is dispatched, it's identified by a unique name (e.g. <code translate="no" class="notranslate">kernel.response</code>), which any number of listeners might be listening to. An <a href="https://github.com/symfony/symfony/blob/7.1/src/Symfony/Contracts/EventDispatcher/Event.php" class="reference external" title="Symfony\Contracts\EventDispatcher\Event" rel="external noopener noreferrer" target="_blank">Event</a> instance is also created and passed to all of the listeners. As you'll see later, the <code translate="no" class="notranslate">Event</code> object itself often contains data about the event being dispatched.</p> <div class="section"> <h4 id="event-names-and-event-objects"><a class="headerlink" href="#event-names-and-event-objects" title="Permalink to this headline">Event Names and Event Objects</a></h4> <p>When the dispatcher notifies listeners, it passes an actual <code translate="no" class="notranslate">Event</code> object to those listeners. The base <code translate="no" class="notranslate">Event</code> class contains a method for stopping <a href="event_dispatcher.html#event_dispatcher-event-propagation" class="reference internal">event propagation</a>, but not much else.</p> <div class="admonition admonition-seealso "> <p class="admonition-title"> <svg fill="none" width="24" height="24" viewbox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13.828 10.172a4 4 0 00-5.656 0l-4 4a4 4 0 105.656 5.656l1.102-1.101m-.758-4.899a4 4 0 005.656 0l4-4a4 4 0 00-5.656-5.656l-1.1 1.1"></path></svg> <span>See also</span> </p><p>Read "<a href="../components/event_dispatcher/generic_event.html" class="reference internal">The Generic Event Object</a>" for more information about this base event object.</p> </div> <p>Often times, data about a specific event needs to be passed along with the <code translate="no" class="notranslate">Event</code> object so that the listeners have the needed information. In such case, a special subclass that has additional methods for retrieving and overriding information can be passed when dispatching an event. For example, the <code translate="no" class="notranslate">kernel.response</code> event uses a <a href="https://github.com/symfony/symfony/blob/7.1/src/Symfony/Component/HttpKernel/Event/ResponseEvent.php" class="reference external" title="Symfony\Component\HttpKernel\Event\ResponseEvent" rel="external noopener noreferrer" target="_blank">ResponseEvent</a>, which contains methods to get and even replace the <code translate="no" class="notranslate">Response</code> object.</p> </div> </div> <div class="section"> <h3 id="the-dispatcher"><a class="headerlink" href="#the-dispatcher" title="Permalink to this headline">The Dispatcher</a></h3> <p>The dispatcher is the central object of the event dispatcher system. In general, a single dispatcher is created, which maintains a registry of listeners. When an event is dispatched via the dispatcher, it notifies all listeners registered with that event:</p> <div translate="no" data-loc="3" class="notranslate codeblock codeblock-length-sm codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">EventDispatcher</span>; <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>dispatcher</span> = <span class="hljs-keyword">new</span> <span class="hljs-title invoke__">EventDispatcher</span>();</code></pre> </div> </div> </div> <div class="section"> <h3 id="connecting-listeners"><a class="headerlink" href="#connecting-listeners" title="Permalink to this headline">Connecting Listeners</a></h3> <p>To take advantage of an existing event, you need to connect a listener to the dispatcher so that it can be notified when the event is dispatched. A call to the dispatcher's <code translate="no" class="notranslate">addListener()</code> method associates any valid PHP callable to an event:</p> <div translate="no" data-loc="2" class="notranslate codeblock codeblock-length-sm codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2</pre> <pre class="codeblock-code"><code><span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>listener</span> = <span class="hljs-keyword">new</span> <span class="hljs-title invoke__">AcmeListener</span>(); <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>dispatcher</span>-><span class="hljs-title invoke__">addListener</span>(<span class="hljs-string">'acme.foo.action'</span>, [<span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>listener</span>, <span class="hljs-string">'onFooAction'</span>]);</code></pre> </div> </div> <p>The <code translate="no" class="notranslate">addListener()</code> method takes up to three arguments:</p> <ol class="arabic"> <li>The event name (string) that this listener wants to listen to;</li> <li>A PHP callable that will be executed when the specified event is dispatched;</li> <li>An optional priority, defined as a positive or negative integer (defaults to <code translate="no" class="notranslate">0</code>). The higher the number, the earlier the listener is called. If two listeners have the same priority, they are executed in the order that they were added to the dispatcher.</li> </ol> <div class="admonition admonition-note "> <p class="admonition-title"> <svg fill="none" width="24" height="24" viewbox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"></path></svg> <span>Note</span> </p><p>A <a href="https://www.php.net/manual/en/language.types.callable.php" class="reference external" rel="external noopener noreferrer" target="_blank">PHP callable</a> is a PHP variable that can be used by the <code translate="no" class="notranslate">call_user_func()</code> function and returns <code translate="no" class="notranslate">true</code> when passed to the <code translate="no" class="notranslate">is_callable()</code> function. It can be a <code translate="no" class="notranslate">\Closure</code> instance, an object implementing an <code translate="no" class="notranslate">__invoke()</code> method (which is what closures are in fact), a string representing a function or an array representing an object method or a class method.</p> <p>So far, you've seen how PHP objects can be registered as listeners. You can also register PHP <a href="https://www.php.net/manual/en/functions.anonymous.php" class="reference external" rel="external noopener noreferrer" target="_blank">Closures</a> as event listeners:</p> <div translate="no" data-loc="5" class="notranslate codeblock codeblock-length-sm codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Contracts</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">Event</span>; <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>dispatcher</span>-><span class="hljs-title invoke__">addListener</span>(<span class="hljs-string">'acme.foo.action'</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-params">(Event <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>)</span>: <span class="hljs-title">void</span> </span>{ // will be executed when the acme.foo.action event is dispatched });</code></pre> </div> </div> </div> <p>Once a listener is registered with the dispatcher, it waits until the event is notified. In the above example, when the <code translate="no" class="notranslate">acme.foo.action</code> event is dispatched, the dispatcher calls the <code translate="no" class="notranslate">AcmeListener::onFooAction()</code> method and passes the <code translate="no" class="notranslate">Event</code> object as the single argument:</p> <div translate="no" data-loc="11" class="notranslate codeblock codeblock-length-md codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5 6 7 8 9 10 11</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Contracts</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">Event</span>; <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">AcmeListener</span> </span>{ <span class="hljs-comment">// ...</span> <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">onFooAction</span><span class="hljs-params">(Event <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>)</span>: <span class="hljs-title">void</span> </span>{ <span class="hljs-comment">// ... do something</span> } }</code></pre> </div> </div> <p>The <code translate="no" class="notranslate">$event</code> argument is the event object that was passed when dispatching the event. In many cases, a special event subclass is passed with extra information. You can check the documentation or implementation of each event to determine which instance is passed.</p> <div class="admonition-wrapper"><div class="admonition admonition-sidebar"><p class="sidebar-title"><span>Registering Event Listeners and Subscribers in the Service Container</span></p><p>Registering service definitions and tagging them with the <code translate="no" class="notranslate">kernel.event_listener</code> and <code translate="no" class="notranslate">kernel.event_subscriber</code> tags is not enough to enable the event listeners and event subscribers. You must also register a compiler pass called <code translate="no" class="notranslate">RegisterListenersPass()</code> in the container builder:</p> <div translate="no" data-loc="22" class="notranslate codeblock codeblock-length-md codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">DependencyInjection</span>\<span class="hljs-title">ContainerBuilder</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">DependencyInjection</span>\<span class="hljs-title">ParameterBag</span>\<span class="hljs-title">ParameterBag</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">DependencyInjection</span>\<span class="hljs-title">RegisterListenersPass</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">EventDispatcher</span>; <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>container</span> = <span class="hljs-keyword">new</span> <span class="hljs-title invoke__">ContainerBuilder</span>(<span class="hljs-keyword">new</span> <span class="hljs-title invoke__">ParameterBag</span>()); <span class="hljs-comment">// register the compiler pass that handles the 'kernel.event_listener'</span> <span class="hljs-comment">// and 'kernel.event_subscriber' service tags</span> <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>container</span>-><span class="hljs-title invoke__">addCompilerPass</span>(<span class="hljs-keyword">new</span> <span class="hljs-title invoke__">RegisterListenersPass</span>()); <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>container</span>-><span class="hljs-title invoke__">register</span>(<span class="hljs-string">'event_dispatcher'</span>, EventDispatcher::<span class="hljs-variable language_">class</span>); <span class="hljs-comment">// registers an event listener</span> <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>container</span>-><span class="hljs-title invoke__">register</span>(<span class="hljs-string">'listener_service_id'</span>, \AcmeListener::<span class="hljs-variable language_">class</span>) -><span class="hljs-title invoke__">addTag</span>(<span class="hljs-string">'kernel.event_listener'</span>, [ <span class="hljs-string">'event'</span> => <span class="hljs-string">'acme.foo.action'</span>, <span class="hljs-string">'method'</span> => <span class="hljs-string">'onFooAction'</span>, ]); <span class="hljs-comment">// registers an event subscriber</span> <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>container</span>-><span class="hljs-title invoke__">register</span>(<span class="hljs-string">'subscriber_service_id'</span>, \AcmeSubscriber::<span class="hljs-variable language_">class</span>) -><span class="hljs-title invoke__">addTag</span>(<span class="hljs-string">'kernel.event_subscriber'</span>);</code></pre> </div> </div> <p><code translate="no" class="notranslate">RegisterListenersPass</code> resolves aliased class names which for instance allows to refer to an event via the fully qualified class name (FQCN) of the event class. The pass will read the alias mapping from a dedicated container parameter. This parameter can be extended by registering another compiler pass, <code translate="no" class="notranslate">AddEventAliasesPass</code>:</p> <div translate="no" data-loc="22" class="notranslate codeblock codeblock-length-md codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">DependencyInjection</span>\<span class="hljs-title">Compiler</span>\<span class="hljs-title">PassConfig</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">DependencyInjection</span>\<span class="hljs-title">ContainerBuilder</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">DependencyInjection</span>\<span class="hljs-title">ParameterBag</span>\<span class="hljs-title">ParameterBag</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">DependencyInjection</span>\<span class="hljs-title">AddEventAliasesPass</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">DependencyInjection</span>\<span class="hljs-title">RegisterListenersPass</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">EventDispatcher</span>; <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>container</span> = <span class="hljs-keyword">new</span> <span class="hljs-title invoke__">ContainerBuilder</span>(<span class="hljs-keyword">new</span> <span class="hljs-title invoke__">ParameterBag</span>()); <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>container</span>-><span class="hljs-title invoke__">addCompilerPass</span>(<span class="hljs-keyword">new</span> <span class="hljs-title invoke__">AddEventAliasesPass</span>([ \AcmeFooActionEvent::<span class="hljs-variable language_">class</span> => <span class="hljs-string">'acme.foo.action'</span>, ])); <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>container</span>-><span class="hljs-title invoke__">addCompilerPass</span>(<span class="hljs-keyword">new</span> <span class="hljs-title invoke__">RegisterListenersPass</span>(), PassConfig::<span class="hljs-variable constant_">TYPE_BEFORE_REMOVING</span>); <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>container</span>-><span class="hljs-title invoke__">register</span>(<span class="hljs-string">'event_dispatcher'</span>, EventDispatcher::<span class="hljs-variable language_">class</span>); <span class="hljs-comment">// registers an event listener</span> <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>container</span>-><span class="hljs-title invoke__">register</span>(<span class="hljs-string">'listener_service_id'</span>, \AcmeListener::<span class="hljs-variable language_">class</span>) -><span class="hljs-title invoke__">addTag</span>(<span class="hljs-string">'kernel.event_listener'</span>, [ // will be translated to <span class="hljs-string">'acme.foo.action'</span> by RegisterListenersPass. <span class="hljs-string">'event'</span> => \AcmeFooActionEvent::<span class="hljs-variable language_">class</span>, <span class="hljs-string">'method'</span> => <span class="hljs-string">'onFooAction'</span>, ]);</code></pre> </div> </div> <div class="admonition admonition-note "> <p class="admonition-title"> <svg fill="none" width="24" height="24" viewbox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"></path></svg> <span>Note</span> </p><p>Note that <code translate="no" class="notranslate">AddEventAliasesPass</code> has to be processed before <code translate="no" class="notranslate">RegisterListenersPass</code>.</p> </div> <p>The listeners pass assumes that the event dispatcher's service id is <code translate="no" class="notranslate">event_dispatcher</code>, that event listeners are tagged with the <code translate="no" class="notranslate">kernel.event_listener</code> tag, that event subscribers are tagged with the <code translate="no" class="notranslate">kernel.event_subscriber</code> tag and that the alias mapping is stored as parameter <code translate="no" class="notranslate">event_dispatcher.event_aliases</code>.</p> </div></div> <span id="event_dispatcher-closures-as-listeners"></span> </div> <div class="section"> <h3 id="creating-and-dispatching-an-event"><a class="headerlink" href="#creating-and-dispatching-an-event" title="Permalink to this headline">Creating and Dispatching an Event</a></h3> <p>In addition to registering listeners with existing events, you can create and dispatch your own events. This is useful when creating third-party libraries and also when you want to keep different components of your own system flexible and decoupled.</p> <span id="creating-an-event-object"></span> <div class="section"> <h4 id="creating-an-event-class"><a class="headerlink" href="#creating-an-event-class" title="Permalink to this headline">Creating an Event Class</a></h4> <p>Suppose you want to create a new event that is dispatched each time a customer orders a product with your application. When dispatching this event, you'll pass a custom event instance that has access to the placed order. Start by creating this custom event class and documenting it:</p> <div translate="no" data-loc="18" class="notranslate codeblock codeblock-length-md codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">namespace</span> <span class="hljs-title">Acme</span>\<span class="hljs-title">Store</span>\<span class="hljs-title">Event</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Acme</span>\<span class="hljs-title">Store</span>\<span class="hljs-title">Order</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Contracts</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">Event</span>; <span class="hljs-comment">/** * This event is dispatched each time an order * is placed in the system. */</span> <span class="hljs-keyword">final</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">OrderPlacedEvent</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Event</span> </span>{ <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">__construct</span><span class="hljs-params">(<span class="hljs-keyword">private</span> Order <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>order</span>)</span> </span>{} <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getOrder</span><span class="hljs-params">()</span>: <span class="hljs-title">Order</span> </span>{ <span class="hljs-keyword">return</span> <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>this</span>->order; } }</code></pre> </div> </div> <p>Each listener now has access to the order via the <code translate="no" class="notranslate">getOrder()</code> method.</p> </div> <div class="section"> <h4 id="dispatch-the-event"><a class="headerlink" href="#dispatch-the-event" title="Permalink to this headline">Dispatch the Event</a></h4> <p>The <a href="https://github.com/symfony/symfony/blob/7.1/src/Symfony/Component/EventDispatcher/EventDispatcher.php#:~:text=function%20dispatch" class="reference external" title="Symfony\Component\EventDispatcher\EventDispatcher::dispatch()" rel="external noopener noreferrer" target="_blank">dispatch()</a> method notifies all listeners of the given event. It takes two arguments: the <code translate="no" class="notranslate">Event</code> instance to pass to each listener of that event and the name of the event to dispatch:</p> <div translate="no" data-loc="10" class="notranslate codeblock codeblock-length-md codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5 6 7 8 9 10</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">use</span> <span class="hljs-title">Acme</span>\<span class="hljs-title">Store</span>\<span class="hljs-title">Event</span>\<span class="hljs-title">OrderPlacedEvent</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Acme</span>\<span class="hljs-title">Store</span>\<span class="hljs-title">Order</span>; <span class="hljs-comment">// the order is somehow created or retrieved</span> <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>order</span> = <span class="hljs-keyword">new</span> <span class="hljs-title invoke__">Order</span>(); <span class="hljs-comment">// ...</span> <span class="hljs-comment">// creates the OrderPlacedEvent and dispatches it</span> <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span> = <span class="hljs-keyword">new</span> <span class="hljs-title invoke__">OrderPlacedEvent</span>(<span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>order</span>); <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>dispatcher</span>-><span class="hljs-title invoke__">dispatch</span>(<span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>);</code></pre> </div> </div> <p>Notice that the special <code translate="no" class="notranslate">OrderPlacedEvent</code> object is created and passed to the <code translate="no" class="notranslate">dispatch()</code> method. Now, any listener to the <code translate="no" class="notranslate">OrderPlacedEvent::class</code> event will receive the <code translate="no" class="notranslate">OrderPlacedEvent</code>.</p> <div class="admonition admonition-note "> <p class="admonition-title"> <svg fill="none" width="24" height="24" viewbox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"></path></svg> <span>Note</span> </p><p>If you don't need to pass any additional data to the event listeners, you can also use the default <a href="https://github.com/symfony/symfony/blob/7.1/src/Symfony/Contracts/EventDispatcher/Event.php" class="reference external" title="Symfony\Contracts\EventDispatcher\Event" rel="external noopener noreferrer" target="_blank">Event</a> class. In such case, you can document the event and its name in a generic <code translate="no" class="notranslate">StoreEvents</code> class, similar to the <a href="https://github.com/symfony/symfony/blob/7.1/src/Symfony/Component/HttpKernel/KernelEvents.php" class="reference external" title="Symfony\Component\HttpKernel\KernelEvents" rel="external noopener noreferrer" target="_blank">KernelEvents</a> class:</p> <div translate="no" data-loc="9" class="notranslate codeblock codeblock-length-sm codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5 6 7 8 9</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">namespace</span> <span class="hljs-title">App</span>\<span class="hljs-title">Event</span>; <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">StoreEvents</span> </span>{ <span class="hljs-comment">/** * <span class="hljs-doctag">@Event</span>("Symfony\Contracts\EventDispatcher\Event") */</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">const</span> ORDER_PLACED = <span class="hljs-string">'order.placed'</span>; }</code></pre> </div> </div> <p>And use the <a href="https://github.com/symfony/symfony/blob/7.1/src/Symfony/Contracts/EventDispatcher/Event.php" class="reference external" title="Symfony\Contracts\EventDispatcher\Event" rel="external noopener noreferrer" target="_blank">Event</a> class to dispatch the event:</p> <div translate="no" data-loc="3" class="notranslate codeblock codeblock-length-sm codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Contracts</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">Event</span>; <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>this</span>->eventDispatcher-><span class="hljs-title invoke__">dispatch</span>(<span class="hljs-keyword">new</span> <span class="hljs-title invoke__">Event</span>(), StoreEvents::<span class="hljs-variable constant_">ORDER_PLACED</span>);</code></pre> </div> </div> </div> <span id="event_dispatcher-using-event-subscribers"></span> </div> </div> <div class="section"> <h3 id="using-event-subscribers"><a class="headerlink" href="#using-event-subscribers" title="Permalink to this headline">Using Event Subscribers</a></h3> <p>The most common way to listen to an event is to register an <em>event listener</em> with the dispatcher. This listener can listen to one or more events and is notified each time those events are dispatched.</p> <p>Another way to listen to events is via an <em>event subscriber</em>. An event subscriber is a PHP class that's able to tell the dispatcher exactly which events it should subscribe to. It implements the <a href="https://github.com/symfony/symfony/blob/7.1/src/Symfony/Component/EventDispatcher/EventSubscriberInterface.php" class="reference external" title="Symfony\Component\EventDispatcher\EventSubscriberInterface" rel="external noopener noreferrer" target="_blank">EventSubscriberInterface</a> interface, which requires a single static method called <a href="https://github.com/symfony/symfony/blob/7.1/src/Symfony/Component/EventDispatcher/EventSubscriberInterface.php#:~:text=function%20getSubscribedEvents" class="reference external" title="Symfony\Component\EventDispatcher\EventSubscriberInterface::getSubscribedEvents()" rel="external noopener noreferrer" target="_blank">getSubscribedEvents()</a>. Take the following example of a subscriber that subscribes to the <code translate="no" class="notranslate">kernel.response</code> and <code translate="no" class="notranslate">OrderPlacedEvent::class</code> events:</p> <div translate="no" data-loc="36" class="notranslate codeblock codeblock-length-md codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">namespace</span> <span class="hljs-title">Acme</span>\<span class="hljs-title">Store</span>\<span class="hljs-title">Event</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Acme</span>\<span class="hljs-title">Store</span>\<span class="hljs-title">Event</span>\<span class="hljs-title">OrderPlacedEvent</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">EventSubscriberInterface</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">HttpKernel</span>\<span class="hljs-title">Event</span>\<span class="hljs-title">ResponseEvent</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Component</span>\<span class="hljs-title">HttpKernel</span>\<span class="hljs-title">KernelEvents</span>; <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">StoreSubscriber</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">EventSubscriberInterface</span> </span>{ <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getSubscribedEvents</span><span class="hljs-params">()</span>: <span class="hljs-title">array</span> </span>{ <span class="hljs-keyword">return</span> [ KernelEvents::<span class="hljs-variable constant_">RESPONSE</span> => [ [<span class="hljs-string">'onKernelResponsePre'</span>, <span class="hljs-number">10</span>], [<span class="hljs-string">'onKernelResponsePost'</span>, <span class="hljs-number">-10</span>], ], OrderPlacedEvent::<span class="hljs-variable language_">class</span> => <span class="hljs-string">'onPlacedOrder'</span>, ]; } <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">onKernelResponsePre</span><span class="hljs-params">(ResponseEvent <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>)</span>: <span class="hljs-title">void</span> </span>{ <span class="hljs-comment">// ...</span> } <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">onKernelResponsePost</span><span class="hljs-params">(ResponseEvent <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>)</span>: <span class="hljs-title">void</span> </span>{ <span class="hljs-comment">// ...</span> } <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">onPlacedOrder</span><span class="hljs-params">(OrderPlacedEvent <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>)</span>: <span class="hljs-title">void</span> </span>{ <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>order</span> = <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>-><span class="hljs-title invoke__">getOrder</span>(); <span class="hljs-comment">// ...</span> } }</code></pre> </div> </div> <p>This is very similar to a listener class, except that the class itself can tell the dispatcher which events it should listen to. To register a subscriber with the dispatcher, use the <a href="https://github.com/symfony/symfony/blob/7.1/src/Symfony/Component/EventDispatcher/EventDispatcher.php#:~:text=function%20addSubscriber" class="reference external" title="Symfony\Component\EventDispatcher\EventDispatcher::addSubscriber()" rel="external noopener noreferrer" target="_blank">addSubscriber()</a> method:</p> <div translate="no" data-loc="5" class="notranslate codeblock codeblock-length-sm codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">use</span> <span class="hljs-title">Acme</span>\<span class="hljs-title">Store</span>\<span class="hljs-title">Event</span>\<span class="hljs-title">StoreSubscriber</span>; <span class="hljs-comment">// ...</span> <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>subscriber</span> = <span class="hljs-keyword">new</span> <span class="hljs-title invoke__">StoreSubscriber</span>(); <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>dispatcher</span>-><span class="hljs-title invoke__">addSubscriber</span>(<span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>subscriber</span>);</code></pre> </div> </div> <p>The dispatcher will automatically register the subscriber for each event returned by the <code translate="no" class="notranslate">getSubscribedEvents()</code> method. This method returns an array indexed by event names and whose values are either the method name to call or an array composed of the method name to call and a priority (a positive or negative integer that defaults to <code translate="no" class="notranslate">0</code>).</p> <p>The example above shows how to register several listener methods for the same event in subscriber and also shows how to pass the priority of each listener method. The higher the number, the earlier the method is called. In the above example, when the <code translate="no" class="notranslate">kernel.response</code> event is triggered, the methods <code translate="no" class="notranslate">onKernelResponsePre()</code> and <code translate="no" class="notranslate">onKernelResponsePost()</code> are called in that order.</p> <span id="event_dispatcher-event-propagation"></span> </div> <div class="section"> <h3 id="stopping-event-flow-propagation"><a class="headerlink" href="#stopping-event-flow-propagation" title="Permalink to this headline">Stopping Event Flow/Propagation</a></h3> <p>In some cases, it may make sense for a listener to prevent any other listeners from being called. In other words, the listener needs to be able to tell the dispatcher to stop all propagation of the event to future listeners (i.e. to not notify any more listeners). This can be accomplished from inside a listener via the <a href="https://github.com/symfony/symfony/blob/7.1/src/Symfony/Contracts/EventDispatcher/Event.php#:~:text=function%20stopPropagation" class="reference external" title="Symfony\Contracts\EventDispatcher\Event::stopPropagation()" rel="external noopener noreferrer" target="_blank">stopPropagation()</a> method:</p> <div translate="no" data-loc="8" class="notranslate codeblock codeblock-length-sm codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5 6 7 8</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">use</span> <span class="hljs-title">Acme</span>\<span class="hljs-title">Store</span>\<span class="hljs-title">Event</span>\<span class="hljs-title">OrderPlacedEvent</span>; <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">onPlacedOrder</span><span class="hljs-params">(OrderPlacedEvent <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>)</span>: <span class="hljs-title">void</span> </span>{ <span class="hljs-comment">// ...</span> <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>-><span class="hljs-title invoke__">stopPropagation</span>(); }</code></pre> </div> </div> <p>Now, any listeners to <code translate="no" class="notranslate">OrderPlacedEvent::class</code> that have not yet been called will <em>not</em> be called.</p> <p>It is possible to detect if an event was stopped by using the <a href="https://github.com/symfony/symfony/blob/7.1/src/Symfony/Contracts/EventDispatcher/Event.php#:~:text=function%20isPropagationStopped" class="reference external" title="Symfony\Contracts\EventDispatcher\Event::isPropagationStopped()" rel="external noopener noreferrer" target="_blank">isPropagationStopped()</a> method which returns a boolean value:</p> <div translate="no" data-loc="5" class="notranslate codeblock codeblock-length-sm codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5</pre> <pre class="codeblock-code"><code><span class="hljs-comment">// ...</span> <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>dispatcher</span>-><span class="hljs-title invoke__">dispatch</span>(<span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>, <span class="hljs-string">'foo.event'</span>); <span class="hljs-keyword">if</span> (<span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>-><span class="hljs-title invoke__">isPropagationStopped</span>()) { <span class="hljs-comment">// ...</span> }</code></pre> </div> </div> <span id="event_dispatcher-dispatcher-aware-events"></span> </div> <div class="section"> <h3 id="eventdispatcher-aware-events-and-listeners"><a class="headerlink" href="#eventdispatcher-aware-events-and-listeners" title="Permalink to this headline">EventDispatcher Aware Events and Listeners</a></h3> <p>The <code translate="no" class="notranslate">EventDispatcher</code> always passes the dispatched event, the event's name and a reference to itself to the listeners. This can lead to some advanced applications of the <code translate="no" class="notranslate">EventDispatcher</code> including dispatching other events inside listeners, chaining events or even lazy loading listeners into the dispatcher object.</p> <span id="event_dispatcher-event-name-introspection"></span> </div> <div class="section"> <h3 id="event-name-introspection"><a class="headerlink" href="#event-name-introspection" title="Permalink to this headline">Event Name Introspection</a></h3> <p>The <code translate="no" class="notranslate">EventDispatcher</code> instance, as well as the name of the event that is dispatched, are passed as arguments to the listener:</p> <div translate="no" data-loc="10" class="notranslate codeblock codeblock-length-md codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5 6 7 8 9 10</pre> <pre class="codeblock-code"><code><span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Contracts</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">Event</span>; <span class="hljs-keyword">use</span> <span class="hljs-title">Symfony</span>\<span class="hljs-title">Contracts</span>\<span class="hljs-title">EventDispatcher</span>\<span class="hljs-title">EventDispatcherInterface</span>; <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MyListener</span> </span>{ <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">myEventListener</span><span class="hljs-params">(Event <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>event</span>, <span class="hljs-keyword">string</span> <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>eventName</span>, EventDispatcherInterface <span class="hljs-variable"><span class="hljs-variable-other-marker">$</span>dispatcher</span>)</span>: <span class="hljs-title">void</span> </span>{ <span class="hljs-comment">// ... do something with the event name</span> } }</code></pre> </div> </div> </div> </div> <div class="section"> <h2 id="other-dispatchers"><a class="headerlink" href="#other-dispatchers" title="Permalink to this headline">Other Dispatchers</a></h2> <p>Besides the commonly used <code translate="no" class="notranslate">EventDispatcher</code>, the component comes with some other dispatchers:</p> <ul> <li><a href="../components/event_dispatcher/immutable_dispatcher.html" class="reference internal">The Immutable Event Dispatcher</a></li> <li><a href="../components/event_dispatcher/traceable_dispatcher.html" class="reference internal">The Traceable Event Dispatcher</a></li> </ul> </div> <div class="section"> <h2 id="learn-more"><a class="headerlink" href="#learn-more" title="Permalink to this headline">Learn More</a></h2> <div class="toctree-wrapper toc-size-md"> <ul class="toctree toctree-level-1 toctree-length-1"> <li> <a href="../components/event_dispatcher/generic_event.html">The Generic Event Object</a> </li> </ul> </div> <ul> <li><a href="../reference/dic_tags.html#dic-tags-kernel-event-listener" class="reference internal">The kernel.event_listener tag</a></li> <li><a href="../reference/dic_tags.html#dic-tags-kernel-event-subscriber" class="reference internal">The kernel.event_subscriber tag</a></li> </ul> </div> </div> </div> <div class="ui-text-sm ui-text-muted mt-4"> This work, including the code samples, is licensed under a <a class="ui-link-muted" rel="license" href="https://creativecommons.org/licenses/by-sa/3.0/">Creative Commons BY-SA 3.0</a> license. </div> <div id="doc-mobile-shortcuts-bar"> <div> <details class="toc"> <summary> <svg width="1em" height="1em" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true"><path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" 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-5.4 2.19 8.47 8.47 0 0 1 -3.84-.91 6.3 6.3 0 0 1 -2.78-2.67 8.91 8.91 0 0 1 -1-4.23zm4 .21a4.83 4.83 0 0 0 1 3.33 3.23 3.23 0 0 0 2.54 1.16 3.26 3.26 0 0 0 2.55-1.16 4.93 4.93 0 0 0 1-3.36 4.86 4.86 0 0 0 -1-3.31 3.29 3.29 0 0 0 -2.55-1.15 3.25 3.25 0 0 0 -2.54 1.15 4.86 4.86 0 0 0 -1.03 3.3z"/><path d="m75 28.49h-3.87v-14.64h3.6v2.08a6.06 6.06 0 0 1 1.66-1.93 3.07 3.07 0 0 1 1.67-.47 4.9 4.9 0 0 1 2.55.73l-1.2 3.38a3.32 3.32 0 0 0 -1.82-.64 2.11 2.11 0 0 0 -1.37.45 3 3 0 0 0 -.89 1.62 22.62 22.62 0 0 0 -.33 4.93z"/><path d="m81.77 13.85h3.57v2a5.75 5.75 0 0 1 4.56-2.33 4.87 4.87 0 0 1 2.44.58 4.39 4.39 0 0 1 1.66 1.75 6.73 6.73 0 0 1 2.09-1.75 5 5 0 0 1 2.38-.58 5.36 5.36 0 0 1 2.73.65 4.06 4.06 0 0 1 1.67 1.93 8.44 8.44 0 0 1 .4 3v9.36h-3.85v-8.34a6.16 6.16 0 0 0 -.4-2.81 1.83 1.83 0 0 0 -1.65-.83 2.66 2.66 0 0 0 -1.53.5 2.71 2.71 0 0 0 -1 1.45 10.52 10.52 0 0 0 -.32 3v7h-3.91v-8a11.17 11.17 0 0 0 -.2-2.76 1.76 1.76 0 0 0 -.64-.92 2 2 0 0 0 -1.18-.31 2.82 2.82 0 0 0 -1.59.56 2.7 2.7 0 0 0 -1 1.4 10.2 10.2 0 0 0 -.31 3v7.11h-3.92z"/><path d="m105.23 28.49v-3.88h3.87v3.88z"/><path d="m110.55 24.31 3.89-.59a2.84 2.84 0 0 0 1 1.72 3.4 3.4 0 0 0 2.12.58 3.86 3.86 0 0 0 2.27-.55 1.25 1.25 0 0 0 .5-1 1.05 1.05 0 0 0 -.27-.74 3.09 3.09 0 0 0 -1.3-.5q-4.68-1-5.94-1.89a3.79 3.79 0 0 1 -1.73-3.3 4.09 4.09 0 0 1 1.5-3.2 7 7 0 0 1 4.66-1.29 8 8 0 0 1 4.46 1 5 5 0 0 1 2 2.89l-3.66.68a2.21 2.21 0 0 0 -.89-1.31 3.18 3.18 0 0 0 -1.86-.45 4.33 4.33 0 0 0 -2.2.42.93.93 0 0 0 -.44.79.85.85 0 0 0 .39.7 14.37 14.37 0 0 0 3.62 1.09 10.82 10.82 0 0 1 4.33 1.64 3.58 3.58 0 0 1 1.21 2.88 4.4 4.4 0 0 1 -1.68 3.46 7.42 7.42 0 0 1 -5 1.45 8.07 8.07 0 0 1 -4.73-1.22 5.56 5.56 0 0 1 -2.25-3.26z"/><path d="m129.66 8.28v7.43a5.79 5.79 0 0 1 6.89-1.71 3.92 3.92 0 0 1 1.62 1.26 4.66 4.66 0 0 1 .74 1.71 15.64 15.64 0 0 1 .2 2.91v8.59h-3.87v-7.72a11.35 11.35 0 0 0 -.22-2.92 1.93 1.93 0 0 0 -.78-1 2.53 2.53 0 0 0 -1.4-.37 3.22 3.22 0 0 0 -1.72.47 2.64 2.64 0 0 0 -1.12 1.43 8.63 8.63 0 0 0 -.35 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