Keep mobile download buttons consistent with durable state
Returning to the shelf shows Download while a transfer is active. Render controls from one persisted lifecycle.
- Focused work estimate
- 1h 45m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- State machines · Persistence
Estimated field mix
- Mobile80%
- Storage systems20%
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 learning app Birch offers synthetic text and small local media fixtures through a loopback adapter. No copyrighted course assets or network accounts are needed.
Setup prerequisites
- Create small local byte fixtures and a range-response stub.
- Simulate low storage, interruptions and stale manifests.
Preceding work
No earlier ticket is required. Complete the project setup above.
Acceptance criteria
- Active transfer shows pause
- Completed content shows open
- Invalid states do not expose start
Implementation constraints
- Define explicit lifecycle transitions.
Verification to include
- Navigate away and return
- Load corrupt lifecycle value
Deliverables
- Download-state projection
Rollout and recovery
Disable new downloads if state cannot be read.
Value of the work
For the engineer: Practice mobile file lifecycles and background state recovery.
For the team: Inspect predictable resource usage and truthful download status.
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.