Topic 15. Messaging through the RabbitMQ broker: work queues, publish–subscribe, delivery guarantees

Goal: become familiar with asynchronous messaging, the architecture of the RabbitMQ broker, and the AMQP 0-9-1 model; learn to publish and consume messages with the RabbitMQ.Client 7 library, build work queues with competing consumers, prefetch, and manual acknowledgments, and route messages with direct, fanout, and topic exchanges; master the tools of guaranteed delivery: durable queues, publisher confirms, dead letter exchanges, and idempotent processing, as well as the RPC pattern over queues and distributed computing through a broker.

Lecture contents

1. Messaging and RabbitMQ — Asynchronous messaging · RabbitMQ architecture and the AMQP 0-9-1 model · Deploying RabbitMQ and management tools
2. The .NET client and work queues — The RabbitMQ.Client 7 .NET client · Work queues and consumer acknowledgments
3. Routing and delivery guarantees — Exchanges and routing · Delivery guarantees
4. Queue types, RPC, and operations — Queue types, dead letter exchanges, and TTL · The RPC pattern over queues · Distributed computing through a broker · Monitoring and operations
5. Examples and common mistakes — Program examples · Common mistakes

Practice and review

• Practice — 3 worked examples with complete code and output
• Tasks — 30 variants, each with tasks at three difficulty levels
• Summary — conclusions, self-check questions, and useful links