FANCLASSNOTIF

FANCLASSNOTIF is a hypothetical notification protocol described within the FANCLASS framework to publish and broadcast updates to entities referred to as fan classes. It is designed to support a decoupled, event-driven architecture where services react to changes asynchronously without direct dependencies on the producers of those changes.

Overview and design

FANCLASSNOTIF uses a publish–subscribe model. Topics are organized by fan class identifiers, typically in a path-like structure such as fanclass/{id}/events. Message payloads are formatted as structured JSON objects that convey the nature of the event, the affected class, and the relevant data. Core event types include CLASS_CREATED, CLASS_UPDATED, CLASS_DELETED, and MEMBER_CHANGED, among others. Each message carries metadata such as a timestamp, a correlationId for tracing, and a version field to support schema evolution. The protocol emphasizes backward compatibility and supports schema versions to enable smooth upgrades.

Message schema and payload

A typical FANCLASSNOTIF message contains:

- event: the type of change (e.g., CLASS_UPDATED)

- classId: the identifier of the fan class

- timestamp: ISO 8601 time of emission

- payload: a domain-specific object describing changes (name, attributes, member changes)

- version and $schema: for schema governance

Messages are designed to be idempotent where possible and to support correlation across distributed workflows.

Reliability, security, and compatibility

FANCLASSNOTIF assumes at-least-once delivery from the broker, with handlers expected to be idempotent. Security considerations include authentication, authorization, and per-topic access controls, often implemented via tokens or keys. The protocol is intended to be broker-agnostic and interoperable with common messaging systems such as Kafka and RabbitMQ, with reference client libraries across multiple programming languages.

See also: FANCLASS, event-driven architecture, publish–subscribe pattern.