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Build E-Commerce Apps with Reactive Programming in Spring Boot

Coding a Consumer

Explore how to write a RabbitMQ consumer in Spring Boot using Spring AMQP. Understand @RabbitListener annotation, queue and exchange bindings, message serialization with Jackson, and testing techniques to efficiently handle asynchronous messaging.

We'll cover the following...

Writing a RabbitMQ consumer

With the producer nicely defined in a WebFlux controller, it’s time to switch gears and focus on writing a RabbitMQ consumer. Spring AMQP actually has multiple options. The absolute simplest approach available is to use AmqpTemplate.receive(queueName). It’s probably not the best solution, though, especially for high-volume environments.

Java
@Service //1
public class SpringAmqpItemService {
    private static final Logger log = 
        LoggerFactory.getLogger(SpringAmqpItemService.class);
    private final ItemRepository repository; //2
    public SpringAmqpItemService(ItemRepository repository) {
        this.repository = repository;
    }
}
Consuming AMQP messages reactively

Here’s a breakdown of the code above:

  1. In line 1, @Service ensures that an instance of this class is created when launched.

  2. In line 7, the ItemRepository is injected through ...