{"id":325065,"date":"2022-03-13T04:34:05","date_gmt":"2022-03-13T04:34:05","guid":{"rendered":"https:\/\/webkul.com\/blog\/?p=325065"},"modified":"2022-03-13T04:34:08","modified_gmt":"2022-03-13T04:34:08","slug":"custom-events-and-event-subscribers-in-symfony","status":"publish","type":"post","link":"https:\/\/webkul.com\/blog\/custom-events-and-event-subscribers-in-symfony\/","title":{"rendered":"Custom Events and Event Subscribers in Symfony"},"content":{"rendered":"\n<p>In this blog we are going to discuss Custom Events and Event Subscribers in Symfony.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What is an Event?<\/strong><\/h3>\n\n\n\n<p>In general, Something that happens is an event. If we take an example of an eccomerce system the below are some events:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Create product <\/li><li>Update Product <\/li><li>Delete Product <\/li><li>Order Create<\/li><\/ul>\n\n\n\n<p>.. and many more<br>So these are the events examples in an eCommerce system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Symfony built-in Events<\/strong><\/h3>\n\n\n\n<p>In Symfony there are several events are already created. For example:<\/p>\n\n\n\n<p>HttpKernel component events: You can use these events to modify handling of request and the response return process.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>kernel.request<\/li><li>kernel.response<\/li><li>kernel.terminate<\/li><\/ul>\n\n\n\n<p>and many others (<a href=\"https:\/\/symfony.com\/doc\/current\/reference\/events.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/symfony.com\/doc\/current\/reference\/events.html<\/a>)<br><br><strong>Now we will understand the event subscribe process step by step.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. install EventDispatcher Component<\/h3>\n\n\n\n<p>To create, dispatch and subscribe events in symfony, &#8220;<strong>event-dispatcher<\/strong>&#8221; component must installed.<br>This component provides tools for :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Your application components can Dispatch events and communicate with each other. <\/li><li>Listening to the events.<br><\/li><\/ul>\n\n\n\n<p>To install <strong>EventDispatcher Component<\/strong> with composer run below command :<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\">composer require symfony\/event-dispatcher<\/pre>\n\n\n\n<p>So EventDispatcher now installed on your symfony application.<\/p>\n\n\n\n<p><strong><em>Further, we will create a custom event.<\/em><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Create Custom Event<\/h3>\n\n\n\n<p>In Symfony, you can also create your own custom events. <br>To create an event you have to create event class in <strong>src\/Event<\/strong> folder.<br>Lets create an event for product creation :<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\">\/\/ src\/ProductCreateEvent.php\n\n&lt;?php\n\nnamespace Product\\Event;\n\nuse Symfony\\Contracts\\EventDispatcher\\Event;\n\nclass ProductCreateEvent extends Event\n{\n    public const NAME = &#039;product.created&#039;;\n\n    \/\/ ....\n}<\/pre>\n\n\n\n<p>That&#8217;s it. Our event for product creation is created.<br>likewise, you can create <strong>ProductUpdateEvent<\/strong> and <strong>ProductDeleteEvent<\/strong> events for Product Updation and product deletion. <br><br><strong><em>Further, we will create subscriber for the event.<\/em><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Create EventSubscriber<\/h3>\n\n\n\n<p>An event subscriber is a method that listens for a specific event that is raised by an event publisher.<br>In this step, we will create an event subscriber for the Product Create Event.<br>event subscriber class is a PHP class which:<br><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Has to implements the <strong>EventSubscriberInterface<\/strong> interface. <\/li><li>Tells the dispatcher for which events event subscriber is subscribed. <\/li><li>Requires a static <strong>getSubscribedEvents() <\/strong>method. The dispatcher automatically registers subscriber for every event returned by this method. It returns an array indexed by event name and value by method name to call<\/li><\/ul>\n\n\n\n<p><strong><em>Create event subscriber class in &#8220;src\/Event&#8221; folder.<\/em><\/strong><br><br>Lets create an event subscriber for product creation events :<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\">\/\/ src\/Event\/ProductEventSubscriber.php\n\n&lt;?php\n\nnamespace Product\\Event;\n\nuse Product\\Event\\ProductCreateEvent;\nuse Symfony\\Component\\EventDispatcher\\EventSubscriberInterface;\nuse Symfony\\Component\\HttpKernel\\Event\\ResponseEvent;\nuse Symfony\\Component\\HttpKernel\\KernelEvents;\n\nclass ProductEventSubscriber implements EventSubscriberInterface\n{\n    \/\/ Returns an array indexed by event name and value by method name to call\n    public static function getSubscribedEvents()\n    {\n        return &#091;\n            ProductCreateEvent::NAME =&gt; &#039;onProductCreation&#039;,\n            \/\/hook multiple functions with the events with priority for sequence of function calls\n            ProductUpdateEvent::NAME =&gt; &#091;\n                &#091;&#039;onProductCreation&#039;, 1],\n                &#091;&#039;onProductUpdation&#039;, 2],\n            ],\n            ProductDeleteEvent::NAME =&gt; &#039;onProductDeletion&#039;,\n            KernelEvents::RESPONSE =&gt; &#039;onKernelResponse&#039;,\n        ];\n    }\n\n    public function onProductCreation(ProductCreateEvent $event)\n    {\n        \/\/ write code to execute on product creation event\n    }\n\n    public function onProductUpdation(ProductUpdateEvent $event)\n    {\n        \/\/ write code to execute on product updation event\n    }\n\n    public function onProductDeletion(ProductDeleteEvent $event)\n    {\n        \/\/ write code to execute on product deletion event\n    }\n\n    public function onKernelResponse(ResponseEvent  $event)\n    {\n        \/\/ write code to execute on in-built Kernel Response event\n    }\n}<\/pre>\n\n\n\n<p>In the above example, we have subscribed for some custom product events and also an in-built event <strong>KernelEvents::RESPONSE<\/strong><br><br><strong>N<em>ext, we have to add subscriber before dispatching the event in our code.<\/em><\/strong><br><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Add Subscriber and dispatching event<\/h3>\n\n\n\n<p>Now how we will add the above created subscriber to the events so that whenever the event occur, our subscriber will be invoked and our desired code can be executed for the event?<br><strong>The answer is addSubscriber() method<\/strong>: We have to call this method to register subscriber with the dispatcher. We have to pass the event subscriber object in the parameter of this function. <br>in our example, we have passed <strong>ProductEventSubscriber<\/strong> class object to in this function.<br><br>Now we have to dispatch the event.<\/p>\n\n\n\n<p><strong>The dispatch() method<\/strong> : Through this function all the listener of the event will get notified. This methods takes two parameters-<br><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>First is the object of the event class for which you have subscribed. In our example we are subscribing for new <strong>ProductCreateEvent()<\/strong>.<\/li><li>Second is the name of the event. So that specific method can be called for the event. In our example we are passing the name of product create event by <strong>ProductCreateEvent::NAME<\/strong>.<\/li><\/ul>\n\n\n\n<p>Lets call this methods in our controller.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\">\/\/ src\/controller\/ProductController.php\n\n&lt;?php\n\nnamespace App\\Controller;\n\nuse Symfony\\Bundle\\FrameworkBundle\\Controller\\AbstractController;\nuse Symfony\\Component\\HttpFoundation\\Response;\nuse Symfony\\Component\\Routing\\Annotation\\Route;\n\nuse Symfony\\Component\\EventDispatcher\\EventDispatcherInterface;\nuse Product\\Event\\ProductCreateEvent;\nuse Product\\Event\\ProductEventSubscriber;\n\nclass ProductController extends AbstractController\n{\n    public function __construct(EventDispatcherInterface $eventDispatcher)\n    {\n        $this-&gt;eventDispatcher = $eventDispatcher;\n    }\n\n    \/**\n     * @Route(&quot;\/products\/new&quot;)\n     *\/\n    public function new(): Response\n    {\n        $event = new ProductCreateEvent();\n        \n        $this-&gt;eventDispatcher-&gt;addSubscriber(new ProductEventSubscriber());\n\n        $this-&gt;eventDispatcher-&gt;dispatch($event, ProductCreateEvent::NAME);\n\n        return new Response(&#039;Return your response here.&#039;);\n    }\n}<\/pre>\n\n\n\n<p>In the above example we registered our subscriber by using <strong>addSubscriber()<\/strong> method on the dispatcher.<\/p>\n\n\n\n<p><strong>We can also do this by using services.yaml and you can register your subscribers in services.yaml.<\/strong><br>Lets add our product.created event subscriber:<\/p>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<pre class=\"EnlighterJSRAW\">\/\/ config\/services.yaml\nservices:\n    Product\\Event\\ProductEventSubscriber:\n        tags:\n            - { name: kernel.event_subscriber, event: product.created }<\/pre>\n<\/div><\/div>\n\n\n\n<p>So in the above ProductController example, we have subscribed (with addSubscriber()) and dispatched(with dispatch()) the event. <br>This is all for creating an event and listen to that event using event subscribers in Symfony.<\/p>\n\n\n\n<p>So this is all the process to create custom events in Symfony and listen to those events by the use of Event Subscribers using event-dispatcher component.<\/p>\n\n\n\n<p>Hope this blog will help you using event dispatcher in your application.<\/p>\n\n\n\n<p>Thanks for reading. Happy coding.\ud83d\ude42<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this blog we are going to discuss Custom Events and Event Subscribers in Symfony. What is an Event? In general, Something that happens is an event. If we take an example of an eccomerce system the below are some events: Create product Update Product Delete Product Order Create .. and many moreSo these are <a href=\"https:\/\/webkul.com\/blog\/custom-events-and-event-subscribers-in-symfony\/\">[&#8230;]<\/a><\/p>\n","protected":false},"author":83,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2029,13,2707,2708,1],"tags":[12498,12499,12495,12496,12494,12493],"class_list":["post-325065","post","type-post","status-publish","format-standard","hentry","category-event","category-php","category-symfony","category-symfony2","category-uncategorized","tag-custom-events-in-symfony","tag-event-dispacher","tag-event-subscribers","tag-event-subscribers-in-symfony","tag-symfony-custom-events","tag-symfony-events"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Custom Events and Event Subscribers in Symfony - 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