# The Web Push Service

The bundle provides a public Web Push service that you can inject this service into your application components.

In the following example, let's imagine that a notification is dispatched using the Symfony Messanger component and catched by an event handler. This handler will fetch all subscriptions and send the notification.

{% hint style="info" %}
The SubscriptionRepository class is totally fictive
{% endhint %}

{% code title="src/MessageHandler/SendNotification.php" %}

```php
<?php

declare(strict_types=1);

namespace App\MessageHandler;

use App\Message\SubscriptionExpired;
use Symfony\Component\Messenger\Handler\MessageHandlerInterface;
use Symfony\Component\Messenger\MessageBusInterface;
use WebPush\Notification;
use WebPush\WebPush;

final class SendPushNotifications implements MessageHandlerInterface
{
    private MessageBusInterface $messageBus;
    private SubscriptionRepository $repository;
    private WebPush $webPush;

    public function __construct(MessageBusInterface $messageBus, SubscriptionRepository $repository, WebPush $webPush)
    {
        $this->messageBus = $messageBus;
        $this->repository = $repository;
        $this->webPush = $webPush;
    }

    public function __invoke(Notification $notification): void
    {
        // Fetch all subscriptions
        $subscriptions = $this->repository->fetchAllSubscriptions();
        foreach ($subscriptions as $subscription) {
            //Sends the notification to the subscriber
            $report = $this->webPush->send($notification, $subscription);

            //If the subscription expired
            if ($report->subscriptionExpired()) {
                //We dispatch a new message and expect for
                // the subscription to be deleted
                $this->messageBus->dispatch(
                    new SubscriptionExpired($subscription)
                );
            }
        }
    }
}
```

{% endcode %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://web-push.spomky-labs.com/3.1.x/the-symfony-bundle/untitled.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.