Queueable handlers

Queueable handlers allow you to handle your kafka messages in a queue. This will put a job into the Laravel queue system for each message received by your Kafka consumer.

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This only requires you to implements the Illuminate\Contracts\Queue\ShouldQueue interface in your Handler.

This is how a queueable handler looks like:

use Illuminate\Contracts\Queue\ShouldQueue;
use Junges\Kafka\Contracts\Handler as HandlerContract;
use Junges\Kafka\Contracts\KafkaConsumerMessage;

class Handler implements HandlerContract, ShouldQueue
{
    public function __invoke(KafkaConsumerMessage $message): void
    {
        // Handle the consumed message.
    }
}

As you can see on the __invoke method, queued handlers does not have access to a MessageConsumer instance when handling the message, because it's running on a laravel queue and there are no actions that can be performed asynchronously on Kafka message consumer.

After creating your handler class, you can use it just as a normal handler, and laravel-kafka will know how to handle it under the hoods 😄.