Rebuild workshop availability after a missed realtime update
Dropped socket messages leave the workshop full after holds expire. Detect version gaps and refresh a snapshot.
- Focused work estimate
- 2h 45m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Synchronization · Recovery
Estimated field mix
- Real-time systems50%
- Distributed systems50%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
Review it, then add it to your workspace.
The board opens an editable draft; nothing is saved until you confirm it. Sign-in and workspace permissions apply, and Demo boards remain ephemeral.
Project context
Fictional craft studio Maple offers workshop seats. Implement synthetic reservations without payments or real booking services.
Setup prerequisites
- Create synthetic workshops with small capacities.
- Implement local transactional hold storage and injected clocks.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- CAUCT-101 · Specify workshop seat counts without negative availability
- CAUCT-102 · Validate workshop hold quantities before storage
- CAUCT-103 · Create workshop holds atomically under contention
- CAUCT-104 · Scope workshop hold lookup and cancellation to its owner
- CAUCT-105 · Confirm workshop holds only before the expiry boundary
- CAUCT-106 · Replay workshop hold requests with the same idempotency key
- CAUCT-107 · Publish workshop availability changes only after commit
Acceptance criteria
- Versions advance monotonically
- Gap triggers resync
- Stale events cannot reduce version
Implementation constraints
- Snapshot and event versions share one scope.
Verification to include
- Apply contiguous updates
- Skip one version and reconnect
Deliverables
- Versioned client projection
Rollout and recovery
Poll snapshots if delta recovery fails.
Value of the work
For the engineer: Practice contention, expiry and truthful realtime projections.
For the team: Inspect whether concurrent clients avoid overselling and recover uncertain results.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.