---
phase: 02-in-memory-backend-and-owner-security
plan: 01
subsystem: database
tags: [dashmap, async-trait, in-memory-store, owner-isolation, security]

requires:
  - phase: 01-foundation-types-and-store-contract
    provides: TaskStore trait, TaskRecord, TaskStatus, TaskError, StoreConfig
provides:
  - InMemoryTaskStore implementing all 11 TaskStore trait methods
  - TaskSecurityConfig with owner resolution, max tasks, TTL enforcement
  - Owner isolation via structural key-based access (NotFound on mismatch)
affects: [02-02, 02-03, 03-handler-integration]

tech-stack:
  added: []
  patterns: [DashMap-based concurrent store, owner-as-key isolation, security config separation]

key-files:
  created:
    - crates/pmcp-tasks/src/store/memory.rs
    - crates/pmcp-tasks/src/store/mod.rs
    - crates/pmcp-tasks/src/security.rs
  modified:
    - crates/pmcp-tasks/src/lib.rs
    - crates/pmcp-tasks/Cargo.toml

key-decisions:
  - "DashMap for concurrent storage (matches SessionManager pattern)"
  - "Owner ID as structural key — mismatch returns NotFound, never OwnerMismatch"
  - "TaskSecurityConfig separate from StoreConfig (security vs storage concerns)"
  - "Expired tasks readable on get(), rejected on mutations"
  - "Default owner ID 'local' for single-user servers without OAuth"

patterns-established:
  - "Owner-as-key isolation: all store methods take owner_id, check against record"
  - "Security config passed at store construction, immutable after"
  - "TTL rejection (not clamping) for over-max values"

requirements-completed: [STOR-05, STOR-06, STOR-07, HNDL-02, HNDL-03, SEC-01, SEC-02, SEC-03, SEC-04, SEC-05, SEC-06, SEC-07, SEC-08]

duration: 7min
completed: 2026-02-21
---

# Phase 02-01: InMemoryTaskStore Summary

**DashMap-backed in-memory TaskStore with structural owner isolation, security config enforcement, and all 11 trait methods**

## Performance

- **Duration:** 7 min
- **Completed:** 2026-02-21
- **Tasks:** 2
- **Files created:** 3, modified: 2

## Accomplishments
- InMemoryTaskStore implementing all 11 TaskStore trait methods with DashMap concurrency
- TaskSecurityConfig with max_tasks_per_owner, TTL enforcement (reject over-max), anonymous access control
- Owner resolution utility (resolve_owner_id) for OAuth identity chain
- Structural owner isolation — owner ID as part of lookup, NotFound on mismatch

## Task Commits

1. **Task 1: TaskSecurityConfig and owner resolution** - `6da3ab7` (feat)
2. **Task 2: InMemoryTaskStore implementation** - `be34791` (feat)

## Files Created/Modified
- `crates/pmcp-tasks/src/security.rs` - TaskSecurityConfig, resolve_owner_id, DEFAULT_OWNER
- `crates/pmcp-tasks/src/store/memory.rs` - InMemoryTaskStore with all 11 methods
- `crates/pmcp-tasks/src/store/mod.rs` - Store module with trait re-export from store.rs (migrated)
- `crates/pmcp-tasks/src/lib.rs` - Updated module declarations and re-exports
- `crates/pmcp-tasks/Cargo.toml` - Added dashmap dependency

## Decisions Made
- Used DashMap (already a workspace dependency) matching SessionManager pattern
- Migrated TaskStore trait from store.rs to store/mod.rs for cleaner module organization
- Separated TaskSecurityConfig from StoreConfig per research recommendation

## Deviations from Plan
None - plan executed as written.

## Issues Encountered
None.

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- InMemoryTaskStore ready for TaskContext (02-02) and comprehensive tests (02-03)
- All trait methods implemented and compilable
- Security config ready for integration testing

---
*Phase: 02-in-memory-backend-and-owner-security*
*Completed: 2026-02-21*
