architecture-event-driven
Architecture Event Driven
Overview
Use this skill to design event-driven systems that remain correct under retries, delays, and partial failures.
Scope Boundaries
- Workflows span multiple bounded contexts or services asynchronously.
- Temporal decoupling is needed to improve autonomy or resilience.
- Integration churn is high and direct RPC coupling causes fragility.
Core Judgments
- Event semantics: fact versus command and ownership of meaning.
- Delivery guarantees: at-most-once, at-least-once, effectively-once patterns.
- Ordering strategy: global ordering, per-key ordering, or order independence.
- Recovery model: replay, dead-letter, compensating actions, and backfill.
Practitioner Heuristics
- Publish events as immutable domain facts from the source of truth.
- Never rely on "exactly-once" assumptions; design idempotent consumers.
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