---
phase: 10-inmemory-backend-refactor
verified: 2026-02-23T14:00:00Z
status: passed
score: 9/9 must-haves verified
---

# Phase 10: InMemory Backend Refactor Verification Report

**Phase Goal:** The existing InMemoryTaskStore is replaced by GenericTaskStore<InMemoryBackend> with zero behavioral changes -- all 200+ existing tests pass unchanged
**Verified:** 2026-02-23
**Status:** PASSED
**Re-verification:** No -- initial verification

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | InMemoryBackend implements all 6 StorageBackend methods using DashMap | VERIFIED | `memory.rs` lines 135-225: get, put, put_if_version, delete, list_by_prefix, cleanup_expired all implemented with `DashMap<String, (Vec<u8>, u64)>` |
| 2 | InMemoryTaskStore wraps GenericTaskStore<InMemoryBackend> with zero-arg new() constructor | VERIFIED | `memory.rs` lines 253-276: `struct InMemoryTaskStore { inner: GenericTaskStore<InMemoryBackend> }` with `pub fn new() -> Self` |
| 3 | Builder methods (with_config, with_security, with_poll_interval) work on InMemoryTaskStore | VERIFIED | `memory.rs` lines 292-327: all three builder methods delegate to `self.inner` and return `self` |
| 4 | InMemoryTaskStore implements TaskStore via delegation to inner GenericTaskStore | VERIFIED | `memory.rs` lines 347-424: `#[async_trait] impl TaskStore for InMemoryTaskStore` with all 11 methods delegating to `self.inner` |
| 5 | All existing 200+ tests pass (assertions and coverage unchanged, test setup adapted) | VERIFIED | `cargo test -p pmcp-tasks`: 561 total tests, 0 failed. Unit: 288, integration: 161, doc-tests: 76. All pass. |
| 6 | Per-backend unit tests validate all 6 StorageBackend methods on InMemoryBackend | VERIFIED | `memory.rs` `mod backend_tests` (lines 427-666): 18 tests covering all 6 methods with happy paths and error cases |
| 7 | TestBackend in generic.rs is replaced by InMemoryBackend (single source of truth) | VERIFIED | `grep TestBackend crates/pmcp-tasks/src/` returns no output. generic.rs imports and uses `InMemoryBackend` in all test helpers. |
| 8 | CasConflictBackend test wrapper uses InMemoryBackend instead of TestBackend | VERIFIED | `generic.rs` lines 915-916: `struct CasConflictBackend { inner: Arc<InMemoryBackend> }` |
| 9 | All generic.rs tests pass using InMemoryBackend | VERIFIED | `store::generic::tests::*`: 30 tests all pass |

**Score:** 9/9 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `crates/pmcp-tasks/src/store/memory.rs` | InMemoryBackend + InMemoryTaskStore wrapper + TaskStore delegation | VERIFIED | File exists, 1,424 lines. Contains `pub struct InMemoryBackend`, `pub struct InMemoryTaskStore`, `impl TaskStore for InMemoryTaskStore`, `mod backend_tests`, `mod tests` |
| `crates/pmcp-tasks/src/store/generic.rs` | Updated to use InMemoryBackend, backend() accessor added | VERIFIED | File exists, 1,271 lines. `pub fn backend(&self) -> &B` at line 607. All tests import `InMemoryBackend`. No TestBackend. |
| `crates/pmcp-tasks/src/store/mod.rs` | Updated module docs removing Legacy section | VERIFIED | File exists, module-level docs updated with Backends section mentioning InMemoryBackend. No Legacy section. |
| `crates/pmcp-tasks/src/lib.rs` | Re-export of InMemoryBackend | VERIFIED | Line 55: `pub use store::memory::InMemoryBackend;` |

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| `store/memory.rs` | `store/generic.rs` | `InMemoryTaskStore.inner: GenericTaskStore<InMemoryBackend>` | WIRED | Line 254: `inner: GenericTaskStore<InMemoryBackend>` -- field type directly references GenericTaskStore |
| `store/memory.rs` | `store/backend.rs` | `impl StorageBackend for InMemoryBackend` | WIRED | Lines 135-225: full `#[async_trait] impl StorageBackend for InMemoryBackend` |
| `store/generic.rs` | `store/memory.rs` | test code imports InMemoryBackend | WIRED | Line 616: `use crate::store::memory::InMemoryBackend;` -- all test helpers and tests use it |

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|------------|-------------|--------|----------|
| IMEM-01 | 10-01-PLAN, 10-02-PLAN | InMemoryBackend implements StorageBackend using DashMap | SATISFIED | `pub struct InMemoryBackend { data: DashMap<String, (Vec<u8>, u64)> }` with full StorageBackend impl |
| IMEM-02 | 10-01-PLAN | InMemoryTaskStore becomes GenericTaskStore<InMemoryBackend> with backward-compatible constructors | SATISFIED | `struct InMemoryTaskStore { inner: GenericTaskStore<InMemoryBackend> }` with `new()`, `Default`, `with_config`, `with_security`, `with_poll_interval` all preserved |
| IMEM-03 | 10-01-PLAN | All existing 200+ tests pass unchanged after the refactor | SATISFIED | 561 tests pass (288 unit + 161 integration + 76 doc-tests); 0 failed |
| TEST-01 | 10-02-PLAN | Per-backend unit tests for InMemoryBackend validating StorageBackend contract | SATISFIED | `mod backend_tests` in memory.rs: 18 tests across all 6 StorageBackend methods (get x2, put x3, put_if_version x4, delete x3, list_by_prefix x3, cleanup_expired x3) |

All 4 requirement IDs declared across both plans are satisfied. Cross-referenced against REQUIREMENTS.md traceability table -- all 4 are marked Complete for Phase 10.

No orphaned requirements: REQUIREMENTS.md maps IMEM-01, IMEM-02, IMEM-03, TEST-01 to Phase 10, matching the plan declarations exactly.

### Anti-Patterns Found

None. Scanned `memory.rs` and `generic.rs` for:
- TODO/FIXME/HACK/PLACEHOLDER comments: none found
- Empty return stubs (`return null`, `return {}`, etc.): none found
- Console log only implementations: not applicable (Rust codebase)

### Human Verification Required

None. All verification is programmatic for this phase:
- Test suite execution is deterministic and automated
- Clippy and formatting checks are automated
- Structural wiring (imports, type relationships) verified via grep and code inspection
- Commit hash existence verified via git

### Gaps Summary

No gaps. All must-haves from both plans are fully implemented and verified:

**Plan 01 (IMEM-01, IMEM-02, IMEM-03):**
- InMemoryBackend: public struct, DashMap backend, all 6 StorageBackend methods, len()/is_empty() helpers
- InMemoryTaskStore: thin wrapper, all builder methods, Default impl, TaskStore delegation (11 methods)
- backend() accessor on GenericTaskStore for test introspection
- InMemoryBackend re-exported from lib.rs
- 5000ms poll interval preserved to avoid test churn
- Test setup adapted (force_expire helper, backend() calls for len checks)

**Plan 02 (TEST-01, IMEM-01 confirmation):**
- 18-test `mod backend_tests` module in memory.rs exercising InMemoryBackend directly
- TestBackend completely removed from generic.rs (zero references remain)
- CasConflictBackend now wraps `Arc<InMemoryBackend>`
- Serialization helpers in generic.rs tests updated to `GenericTaskStore::<InMemoryBackend>::`

**Quality gates (verified live):**
- `cargo test -p pmcp-tasks`: 561 passed, 0 failed
- `cargo clippy -p pmcp-tasks -- -D warnings`: clean
- `cargo fmt -p pmcp-tasks --check`: clean

---

_Verified: 2026-02-23_
_Verifier: Claude (gsd-verifier)_
