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laravel_events&_listeners.html
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<!DOCTYPE html>
<html lang="en"><head>
<script src="laravel_events&_listeners_files/libs/clipboard/clipboard.min.js"></script>
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<meta name="generator" content="quarto-1.2.335">
<meta name="author" content="Vladimir Lelicanin - SAE Institute">
<title>Laravel Events & Listeners</title>
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<section id="title-slide" data-background-image="https://keystoneacademic-res.cloudinary.com/image/upload/f_auto/q_auto/g_auto/w_256/element/15/156456_sae.jpg" data-background-position="top left" data-background-repeat="no-repeat" data-background-size="100px" class="quarto-title-block center">
<h1 class="title">Laravel Events & Listeners</h1>
<div class="quarto-title-authors">
<div class="quarto-title-author">
<div class="quarto-title-author-name">
Vladimir Lelicanin - SAE Institute
</div>
</div>
</div>
</section>
<section class="slide level1">
<h2 id="what-are-laravel-events-listeners">What are Laravel Events & Listeners?</h2>
<ul>
<li>Laravel provides a simple and robust way of implementing event-driven architecture.</li>
<li>Laravel’s <code>Event</code> class provides methods for event registration, dispatching, and listening.</li>
<li>Laravel’s <code>Listener</code> interface can be implemented to handle events.</li>
</ul>
<h2 id="creating-an-event">Creating an Event</h2>
<ul>
<li>To create a new event class, use the <code>php artisan event:generate</code> command.</li>
<li>This will create a new <code>app/Events</code> folder and generate a skeleton event class.</li>
<li>Edit the <code>$broadcastOn</code> property to define the channel for broadcasting the event.</li>
<li>Add any additional data that should be passed with the event to the <code>$data</code> property.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="dispatching-an-event">Dispatching an Event</h2>
<ul>
<li>To dispatch an event, use the <code>event()</code> function, passing in an instance of the event class.</li>
<li>All listeners registered for the event will receive the event and can react accordingly.</li>
<li>Laravel will automatically broadcast any event that has a <code>$broadcastOn</code> property defined.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="creating-a-listener">Creating a Listener</h2>
<ul>
<li>To create a new listener, use the <code>php artisan make:listener</code> command.</li>
<li>This will create a new <code>app/Listeners</code> folder and generate a skeleton listener class.</li>
<li>Implement the <code>handle()</code> method to define what should happen when the event is received.</li>
<li>Bind the listener to the event in the <code>EventServiceProvider</code>.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="binding-a-listener">Binding a Listener</h2>
<ul>
<li>Add the listener to the <code>$listen</code> property on the <code>EventServiceProvider</code>.</li>
<li>The key should be the name of the event and the value should be an array of listeners.</li>
<li>If the listener is a class name, it should be specified as a string.</li>
<li>If the listener is a closure, it can be specified inline.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="variable-listener-subscriptions">Variable Listener Subscriptions</h2>
<ul>
<li>It’s possible to bind a listener with variables by passing them as arguments to the <code>listen()</code> method.</li>
<li>The variables will be passed as additional parameters to the listener’s <code>handle()</code> method.</li>
<li>This can be useful for dynamic listener subscriptions.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="queued-listeners">Queued Listeners</h2>
<ul>
<li>Laravel also supports queued listeners.</li>
<li>To queue a listener, add the <code>ShouldQueue</code> interface to the listener class.</li>
<li>Laravel will handle the rest for you, queuing the listener and processing it when resources are available.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="events-models">Events & Models</h2>
<ul>
<li>Laravel offers an easy way to link events to models through event broadcasting.</li>
<li>By default, Laravel will automatically broadcast events that implement the <code>Illuminate\Broadcasting\InteractsWithSockets</code> trait.</li>
<li>This trait provides methods to define the channel and event name, and to broadcast data with the event.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="event-discovery">Event Discovery</h2>
<ul>
<li>By default, Laravel will discover events within the <code>app/Events</code> folder and listeners within the <code>app/Listeners</code> folder.</li>
<li>To change this, modify the <code>$discoveredEvents</code> and <code>$discoveredListeners</code> properties in <code>EventServiceProvider.php</code>.</li>
<li>Alternatively, you can register events and listeners manually.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="manually-registering-events-listeners">Manually Registering Events & Listeners</h2>
<ul>
<li>To register events and listeners manually, use the <code>Event::listen()</code> method.</li>
<li>The first argument is the name of the event.</li>
<li>The second argument is the listener or an array of listeners.</li>
<li>You can pass a function as the second argument to define the listeners inline.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="event-discovery-manual-registration">Event Discovery & Manual Registration</h2>
<ul>
<li>You have the option to use event discovery and manual registration together.</li>
<li>In this case, Laravel will discover events automatically as well as those defined via <code>Event::listen()</code>.</li>
<li>This allows for a high degree of flexibility.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="stopping-event-propagation">Stopping Event Propagation</h2>
<ul>
<li>To stop an event from propagating to other listeners, call the <code>stopPropagation()</code> method on the event object.</li>
<li>This can be useful if a listener has taken care of an event and you want to ensure that other listeners don’t take action as well.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="prioritizing-listeners">Prioritizing Listeners</h2>
<ul>
<li>To define the order in which listeners should be invoked, use the <code>priority()</code> method.</li>
<li>The lower the number, the higher the priority.</li>
<li>Laravel will call the listeners in priority order.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="subscribing-to-multiple-events">Subscribing to Multiple Events</h2>
<ul>
<li>To subscribe a listener to multiple events, use the <code>subscribe()</code> method in the <code>EventServiceProvider</code>.</li>
<li>The subscriber class should implement the <code>Subscriber</code> interface.</li>
<li>All subscribed events and listeners should be defined within the <code>subscribe()</code> method.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="event-firing-testing">Event Firing & Testing</h2>
<ul>
<li>When testing events, you can use Laravel’s <code>Event::fake()</code> method to override event firing.</li>
<li>After calling <code>fake()</code>, events will be queued but not dispatched.</li>
<li>Use the <code>Event::assertDispatched()</code> and <code>Event::assertNotDispatched()</code> methods to test expected behavior.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="event-broadcasting">Event Broadcasting</h2>
<ul>
<li>Event broadcasting is implemented using Laravel’s WebSockets package.</li>
<li>To broadcast an event, implement the <code>ShouldBroadcast</code> interface in the event class.</li>
<li>Define the channel and payload that should be broadcast.</li>
</ul>
</section>
<section class="slide level1">
<h2 id="event-broadcasting-example">Event Broadcasting Example</h2>
<div class="sourceCode" id="cb1"><pre class="sourceCode numberSource php number-lines code-with-copy"><code class="sourceCode php"><span id="cb1-1"><a href="#cb1-1"></a><span class="kw">class</span> <span class="cn">O</span>rderShipped <span class="kw">implements</span> <span class="cn">S</span>houldBroadcast</span>
<span id="cb1-2"><a href="#cb1-2"></a>{</span>
<span id="cb1-3"><a href="#cb1-3"></a> <span class="kw">use</span> <span class="cn">I</span>nteractsWithSockets<span class="ot">;</span></span>
<span id="cb1-4"><a href="#cb1-4"></a></span>
<span id="cb1-5"><a href="#cb1-5"></a> <span class="kw">public</span> <span class="kw">function</span> <span class="bu">__construct</span>(<span class="va">$order</span>)</span>
<span id="cb1-6"><a href="#cb1-6"></a> {</span>
<span id="cb1-7"><a href="#cb1-7"></a> <span class="va">$this</span>->order <span class="op">=</span> <span class="va">$order</span><span class="ot">;</span></span>
<span id="cb1-8"><a href="#cb1-8"></a> }</span>
<span id="cb1-9"><a href="#cb1-9"></a></span>
<span id="cb1-10"><a href="#cb1-10"></a> <span class="kw">public</span> <span class="kw">function</span> broadcastOn()</span>
<span id="cb1-11"><a href="#cb1-11"></a> {</span>
<span id="cb1-12"><a href="#cb1-12"></a> <span class="cf">return</span> <span class="kw">new</span> <span class="cn">P</span>rivateChannel(<span class="st">'orders.'</span> <span class="op">.</span> <span class="va">$this</span>->order->user_id)<span class="ot">;</span></span>
<span id="cb1-13"><a href="#cb1-13"></a> }</span>
<span id="cb1-14"><a href="#cb1-14"></a></span>
<span id="cb1-15"><a href="#cb1-15"></a> <span class="kw">public</span> <span class="kw">function</span> broadcastWith()</span>
<span id="cb1-16"><a href="#cb1-16"></a> {</span>
<span id="cb1-17"><a href="#cb1-17"></a> <span class="cf">return</span> [<span class="st">'id'</span> => <span class="va">$this</span>->order->id]<span class="ot">;</span></span>
<span id="cb1-18"><a href="#cb1-18"></a> }</span>
<span id="cb1-19"><a href="#cb1-19"></a>}</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</section>
<section class="slide level1">
<h2 id="laravel-events-listeners-documentation">Laravel Events & Listeners Documentation</h2>
<ul>
<li><a href="https://laravel.com/docs/8.x/events">Laravel Events</a></li>
<li><a href="https://laravel.com/docs/8.x/events#defining-listeners">Laravel Listeners</a></li>
<li><a href="https://laravel.com/docs/8.x/broadcasting">Laravel Event Broadcasting</a></li>
</ul>
</section>
<section class="slide level1">
<h2 id="references">References</h2>
<ul>
<li><a href="https://laravel.com/docs/8.x">Laravel</a></li>
<li><a href="https://github.com/beyondcode/laravel-websockets">Laravel WebSockets</a></li>
<li><a href="https://en.wikipedia.org/wiki/Event-driven_architecture">Event-Driven Architecture</a></li>
</ul>
<img src="https://upload.wikimedia.org/wikipedia/commons/e/e2/SAE_Institute_Black_Logo.jpg" class="slide-logo r-stretch"><div class="footer footer-default">
<p>Vladimir Lelicanin - SAE Institute Belgrade</p>
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