# Component Status: v2-execution-engine-rust
**Last Updated:** 2025-12-03
**Current State:** 🟢 Stable / Production-Ready
## 🚀 Recent Major Achievements
1. **Refactoring of `Executor::execute`**
* Decomposed monolithic function into 5 modular helper functions.
* Improved maintainability and readability.
* Resolved code complexity warnings.
2. **Singleton & Serial Execution Architecture**
* Implemented `ExecutionEngine::init_global` pattern.
* Strictly enforced `max_concurrent_executions = 1` for the global instance to prevent race conditions during UI integration.
* Ensured thread safety with `once_cell` and `Arc<RwLock>`.
3. **UI Integration Features**
* Added `output_log_path` to `ExecutionRequest` for optional file-based logging of streams.
* Created `examples/json_bridge.rs` as a stdio-based adapter for non-Rust clients.
* Created `examples/node-caller.ts` to verify integration logic independent of Tauri.
4. **Documentation & Handoff**
* Created `docs/UI-INTEGRATION-GUIDE.md` for the frontend team.
* Updated `README.md` and `docs/api.md` to reflect recent API changes.
## 📊 Health Check
- **Tests**: 69/69 Unit Tests Passed + 6/6 Integration Tests Passed.
- **Linter**: 0 Clippy warnings (Clean).
- **Formatting**: Compliant with `cargo fmt`.
- **Build**: Compiles cleanly for release.
## 📋 Pending / Next Steps
- [ ] **Tauri Integration**: Wire up the `ExecutionEngine::global()` in the actual `v2-desktop-app-tauri` commands.
- [ ] **Real-world Verification**: Test with actual long-running AWS CLI commands in the UI.
- [ ] **Cleanup Strategy**: Verify `cleanup_old_executions` behavior under heavy load (simulated).
## 🛠Maintenance Notes
* **Release Management**: When updating `Cargo.toml` version, ensure `CLAUDE.md` quick start commands are still valid.
* **Breaking Changes**: Any change to `ExecutionRequest` struct fields must be reflected in:
1. `src/types.rs`
2. `docs/UI-INTEGRATION-GUIDE.md`
3. `examples/node-caller.ts`