What is RabbitMQ and how does it differ from Kafka? RabbitMQ क्या है और Kafka से कैसे अलग है?

RabbitMQ is a traditional message broker using AMQP protocol for queuing. Unlike Kafka (event streaming), RabbitMQ is optimized for point-to-point messaging, request-reply patterns, and guaranteed delivery with less throughput but simpler semantics.

// RabbitMQ Configuration
@Configuration
public class RabbitMQConfig {
    public static final String QUEUE = 'orders.queue';
    public static final String EXCHANGE = 'orders.exchange';
    public static final String ROUTING_KEY = 'order.#';
    
    @Bean
    public Queue queue() {
        return new Queue(QUEUE);
    }
    
    @Bean
    public TopicExchange exchange() {
        return new TopicExchange(EXCHANGE);
    }
    
    @Bean
    public Binding binding() {
        return BindingBuilder.bind(queue())
            .to(exchange())
            .with(ROUTING_KEY);
    }
}

// RabbitMQ Producer
@Service
public class RabbitProducer {
    @Autowired
    private RabbitTemplate rabbitTemplate;
    
    public void sendMessage(String message) {
        rabbitTemplate.convertAndSend(
            'orders.exchange', 'order.created', message);
    }
}

// RabbitMQ Consumer
@Service
public class RabbitConsumer {
    @RabbitListener(queues = 'orders.queue')
    public void consumeMessage(String message) {
        System.out.println('Received: ' + message);
    }
}

// RabbitMQ patterns:
// 1. Work queues - load balancing
// 2. Pub/Sub - multiple consumers
// 3. Routing - topic-based
// 4. RPC - request-reply

// When to use RabbitMQ:
// - Task queues (email, notifications)
// - Request-reply patterns
// - Complex routing
// - Guaranteed delivery
// - Lower throughput acceptable