symfony/messenger v7.0.1

The Symfony Messenger is a powerful component that aids applications in sending and receiving messages to and from other applications or through message queues. It is particularly helpful in the handling of tasks asynchronously or where inter-application communication is required, enhancing the performance, efficiency and scalability of the overall application.

To use the Symfony Messenger in your PHP application, you'll first have to install it through composer. You can do that by running the following command in your terminal:

composer require symfony/messenger

After installation, you can dispatch messages by creating a message class and a message handler and then dispatching your message. Let's create an UpdateUserPreferences message as an example:

namespace App\Message;

class UpdateUserPreferences
{
    private $userPreferences;

    public function __construct(array $userPreferences)
    {
{
        $this->userPreferences = $userPreferences;
    }

    public function getUserPreferences(): array
    {
        return $this->userPreferences;
    }
}

Now, we create a UpdateUserPreferencesHandler:

namespace App\MessageHandler;

use App\Message\UpdateUserPreferences;

class UpdateUserPreferencesHandler
{
    public function __invoke(UpdateUserPreferences $updateUserPreferences): void
    {
        // Do some logic with $updateUserPreferences
    }
}

With Symfony Messenger installed and the message and handler created, you can then dispatch the message in your application:

namespace App\Controller;

// Make sure to import the necessary namespaces
use App\Message\UpdateUserPreferences;
use Symfony\Component\Messenger\MessageBusInterface;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;

class SomeController extends AbstractController
{
    private $bus;

    public function __construct(MessageBusInterface $bus)
    {
        $this->bus = $bus;
    }

    public function someAction()
    {
        $userPreferences = ['key' => 'value'];

        // The message will be handled asynchronously and the process will continue
        $this->bus->dispatch(new UpdateUserPreferences($userPreferences));
    }
}

Remember, this is a basic example. Using Symfony's Messenger component with routing, transports and middleware can provide a powerful way of handling and dispatching messages.

For a more comprehensive understanding of how Symfony Messenger works, refer to the official Symfony Messenger Documentation. The documentation provides an in-depth look into the component, including how to use it, configure it, and extend it according to your application's requirements. You can also contribute to the project through issues and pull requests on the Symfony GitHub repository.