How to use the Symfony messenger component to send messages between services?

@raphael_tillman 

The Symfony messenger component is a powerful tool that enables communication between different parts of your application by sending messages. To use it to send messages between services, you'll need to follow these steps:

1. Install the messenger component via composer:

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composer require symfony/messenger

1. Configure the messenger component in your config/packages/messenger.yaml file. Here's an example configuration for sending messages via the amqp transport:

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framework:
    messenger:
        transports:
            amqp:
                dsn: '%env(RABBITMQ_DSN)%'
        routing:
            'AppMessageYourMessage': amqp

1. Define your message class. This is the class that will contain the data you want to send between services. For example:

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namespace AppMessage;

class YourMessage
{
    private $data;

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

    public function getData()
    {
        return $this->data;
    }
}

1. Create a message handler class. This class will receive the message and perform any necessary actions. For example:

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namespace AppMessageHandler;

use AppMessageYourMessage;

class YourMessageHandler
{
    public function __invoke(YourMessage $message)
    {
        // Do something with the data
        $data = $message->getData();

        // Return any necessary response
        return $response;
    }
}

1. Use the messenger component to send the message from one service to another. For example:

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use AppMessageYourMessage;

$yourMessage = new YourMessage($data);
$this->messageBus->dispatch($yourMessage);

In this example, $this->messageBus is an instance of SymfonyComponentMessengerMessageBusInterface, which is responsible for dispatching the message to the appropriate handler.

That's it! With these steps, you can use the Symfony messenger component to send messages between services in your application.