When should I use event-driven architecture?

When you have workflows that span multiple services, need to handle partial failures gracefully, or have high-throughput requirements. For simple CRUD apps, direct API calls are simpler and sufficient.

How do you handle event ordering?

Kafka guarantees ordering within a partition. For RabbitMQ, we use single-consumer queues for order-sensitive events. Many workflows are designed to be idempotent, making ordering less critical.

Event-Driven Architecture Explained

Asynchronous events, decoupled services, and resilient workflows — the pattern for complex, scalable systems.

Event-Driven Architecture

An architectural pattern where components communicate by producing and consuming events (state changes) through a message broker, rather than direct synchronous calls.

Explanation

In event-driven architecture, when something happens (user places an order), the service emits an event ("OrderPlaced"). Other services subscribe to this event and react independently: the inventory service reserves stock, the payment service charges the card, the notification service sends a confirmation email. This decouples services, improves resilience (if the email service is down, the order still processes), and enables easier scaling. Common event brokers include Apache Kafka, RabbitMQ, and AWS EventBridge.

Bookuvai Implementation

Bookuvai uses event-driven patterns for workflows that involve multiple services or need to be resilient to partial failures. Our standard stack uses RabbitMQ for message brokering with dead-letter queues for failed events. For high-throughput systems, we use Apache Kafka with exactly-once semantics.

Related Terms

Frequently Asked Questions

When should I use event-driven architecture?: When you have workflows that span multiple services, need to handle partial failures gracefully, or have high-throughput requirements. For simple CRUD apps, direct API calls are simpler and sufficient.
How do you handle event ordering?: Kafka guarantees ordering within a partition. For RabbitMQ, we use single-consumer queues for order-sensitive events. Many workflows are designed to be idempotent, making ordering less critical.