e41ecfad4c
Include Loyalty/Communication/Sports Center backends and registry updates alongside production nginx and compose wiring. Co-authored-by: Cursor <cursoragent@cursor.com>
71 lines
2.2 KiB
Markdown
71 lines
2.2 KiB
Markdown
# Event Template
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Standards for domain and integration events.
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## Domain Events
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- Emitted when an aggregate state change may matter inside or outside the service.
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- Written via outbox in the same DB transaction as the write ([ADR-006](../architecture/adr/ADR-006.md)).
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- Consumers treat events as facts; producers do not assume synchronous handling.
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## Integration Events
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- Cross-service contracts for interoperability (same envelope).
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- Stable payload fields; evolve additively when possible.
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- Consumers must be idempotent (inbox / `event_id`).
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## Naming
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Preferred forms (follow the owning service’s established style):
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| Style | Example | When |
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| --- | --- | --- |
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| `{aggregate}.{past_tense}` | `tenant.created` | Core / generic |
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| `{service}.{aggregate}.{past_tense}` | `crm.lead.created`, `loyalty.member.enrolled` | Namespaced business services |
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Use past tense. Do not use generic names like `update` without the aggregate.
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## Versioning
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1. Envelope fields remain stable ([event-driven-architecture.md](../architecture/event-driven-architecture.md)).
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2. Payload additive changes preferred.
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3. Breaking payload changes: new event type or explicit `payload_version` documented in catalog and handover.
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4. Never reuse an `event_type` string for a different meaning.
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## Payload Rules
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Envelope (canonical):
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```json
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{
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"event_id": "uuid",
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"event_type": "service.aggregate.past_tense",
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"aggregate_type": "aggregate",
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"aggregate_id": "uuid",
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"tenant_id": "uuid|null",
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"source_service": "service-name",
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"payload": {},
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"occurred_at": "ISO-8601"
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}
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```
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Payload must:
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- Include enough IDs for consumers to fetch details via API if needed
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- Avoid embedding secrets or large binaries
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- Prefer refs over duplicated foreign aggregates
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- Remain JSON-serializable
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## Catalog & Registration
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1. List new events in the phase doc and [event-catalog.md](../reference/event-catalog.md).
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2. Update [module-registry.md](../module-registry.md) Events fields.
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3. Update [service-manifest.yaml](service-manifest.yaml) event list.
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## Related Documents
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- [Event-Driven Architecture](../architecture/event-driven-architecture.md)
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- [ADR-006](../architecture/adr/ADR-006.md)
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- [Services Contracts](../reference/services-contracts.md)
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- [Service Layer Template](service-layer-template.md)
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