Bound offline route-note retry backoff
A disconnected emulator retries uploads continuously and drains resources. Add capped backoff with manual retry semantics.
- Focused work estimate
- 1h 45m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Scheduling · Backoff
Estimated field mix
- Mobile60%
- Site reliability40%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
Fictional maintenance coordinator Elm dispatches non-safety-critical inspection visits. Implement a mobile application in an emulator with local API stubs; physical devices and credentials are unnecessary.
Setup prerequisites
- Create synthetic visits and a local sync adapter.
- Provide controllable connectivity and process-restart simulation.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- CROUTE-101 · Label route-note timestamps with their actual zone
- CROUTE-102 · Show downloaded visits when route refresh fails
- CROUTE-103 · Persist field-note edits before leaving a visit
- CROUTE-104 · Queue field-note synchronization by immutable operation ID
- CROUTE-106 · Resume route-note upload after application termination
Acceptance criteria
- Delays grow to cap
- Connectivity recovery can wake once
- Manual retry cannot create parallel senders
Implementation constraints
- Inject timers; avoid wall-clock sleeps in tests.
Verification to include
- Observe scheduled delays
- Toggle connectivity repeatedly
Deliverables
- Retry scheduler and fake-clock tests
Rollout and recovery
Stop automatic retries and expose manual sync.
Value of the work
For the engineer: Practice durable mobile state and explicit sync conflicts.
For the team: Inspect how an engineer protects field work during disconnection.
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.