Show course-download progress without rendering every chunk
Small network chunks trigger excessive mobile renders. Coalesce progress updates while keeping completion immediate.
- Focused work estimate
- 1h 45m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Rendering · Performance
Estimated field mix
- Performance engineering60%
- Mobile40%
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
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Updates have bounded frequency
- Completion bypasses throttle
- Paused bytes remain accurate
Implementation constraints
- Use an injected scheduler.
Verification to include
- Stream many chunks
- Pause between scheduled updates
Deliverables
- Progress coalescer and render-count check
Rollout and recovery
Reduce to coarse milestones if scheduling regresses.
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.