Serialize mobile session refresh for simultaneous requests
Opening a linked screen triggers three refresh calls and conflicting session updates. Share one in-flight refresh.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Concurrency · Authentication
Estimated field mix
- Mobile50%
- Security30%
- Performance engineering20%
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 team-planning app Finch opens invitations and shared work items. All users and sessions are synthetic; implement the app in an emulator without external identity credentials.
Setup prerequisites
- Create a local session adapter with expiry and revocation.
- Define synthetic invitation and work-item links.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Concurrent reads share refresh
- Failure releases waiting requests consistently
- Later retry can start anew
Implementation constraints
- Session tokens stay outside generic logs.
Verification to include
- Trigger three expired reads
- Reject refresh then retry
Deliverables
- Refresh coordinator and concurrency tests
Rollout and recovery
Stop automatic refresh and require explicit sign-in.
Value of the work
For the engineer: Practice navigation state, capability checks and session boundaries.
For the team: Inspect whether links remain useful without bypassing authorization.
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.