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Messaging Guide

Concepts

  • Message: a small envelope with name, payload, and headers.
  • MessagePublisher: interface for publishing.
  • MessageHandler: interface for consuming.
  • InMemoryMessageBus: local example implementation for tests and demos.

Queue Adapters

Real projects can add adapters for RabbitMQ, SQS, Azure Service Bus, Kafka, or Celery without changing services. Services should depend on MessagePublisher.

Naming

Use past-tense event names for facts:

  • user.registered
  • invoice.created
  • payment.failed