# Sprint 40 Status Summary

**Date**: 2026-02-23
**Status**: ✅ COMPLETE (100% Implementation)

---

## Quick Status

```
✅ File Lock Manager:         src/infra/file-lock.ts
✅ Dependency Graph:          src/agents/parallel/dependency-graph.ts
✅ Track Manager:             src/agents/parallel/track-manager.ts
✅ Dependency Scheduler:      src/agents/parallel/dependency-scheduler.ts
✅ Parallel Executor:         src/agents/parallel/parallel-executor.ts
✅ Types:                     Added to src/agents/types.ts
🧪 Test Coverage:            1,914 tests passing (56 test files)
📈 New Tests:                60 tests added
```

---

## ✅ Sprint 40 Implementation Complete

### Parallel Execution Infrastructure

| Module | File | Purpose | Status |
|--------|------|---------|--------|
| **File Lock Manager** | `src/infra/file-lock.ts` | Read/write locks with timeout & conflict detection | ✅ Complete |
| **Dependency Graph** | `src/agents/parallel/dependency-graph.ts` | Task dependency tracking, circular detection | ✅ Complete |
| **Track Manager** | `src/agents/parallel/track-manager.ts` | Manage 2-3 concurrent execution tracks | ✅ Complete |
| **Dependency Scheduler** | `src/agents/parallel/dependency-scheduler.ts` | Build batches respecting dependencies | ✅ Complete |
| **Parallel Executor** | `src/agents/parallel/parallel-executor.ts` | Execute batches with Promise.all | ✅ Complete |

---

## 🏗️ Architecture

```
Tasks → DependencyGraph → DependencyScheduler → TaskBatches
                                                      ↓
TrackManager ← ParallelExecutor ← FileLockManager
       ↓
  [Track 1]  [Track 2]  [Track 3]
      ↓          ↓          ↓
  Promise.all (per batch)
```

### Execution Flow

1. **Task Registration**: Tasks submitted with reads/writes/dependsOn
2. **Dependency Analysis**: DependencyGraph validates and orders tasks
3. **Batch Creation**: DependencyScheduler groups tasks by dependency level
4. **Lock Acquisition**: FileLockManager handles read/write conflicts
5. **Track Assignment**: TrackManager distributes to 2-3 concurrent tracks
6. **Parallel Execution**: ParallelExecutor runs batches with Promise.all
7. **Result Collection**: Aggregate results with timing and status

---

## 📦 New Types Added to `agents/types.ts`

```typescript
// Task status lifecycle
type ParallelTaskStatus = 'pending' | 'ready' | 'running' | 'completed' | 'failed' | 'blocked' | 'cancelled';

// Task definition with file access patterns
interface ParallelTask {
  id: string;
  name: string;
  reads: string[];        // Files this task reads (shared lock)
  writes: string[];       // Files this task writes (exclusive lock)
  dependsOn: string[];    // Task IDs this depends on
  execute: () => Promise<unknown>;
  priority?: number;
  budgetAllocation?: number;
}

// Independent execution unit with budget allocation
interface ExecutionTrack {
  id: string;
  tasks: ParallelTask[];
  budgetAllocation: number;
  status: 'idle' | 'running' | 'completed';
}

// Group of tasks for parallel execution
interface TaskBatch {
  batchNumber: number;
  tasks: ParallelTask[];
  dependencyLevel: number;
}

// Execution results
interface ParallelExecutionResult {
  batches: TaskBatch[];
  results: ParallelTaskResult[];
  totalDuration: number;
  successCount: number;
  failureCount: number;
}

interface ParallelTaskResult {
  taskId: string;
  status: ParallelTaskStatus;
  result?: unknown;
  error?: Error;
  duration: number;
  trackId: string;
}
```

---

## 🔐 Key Features

### File Locking

| Lock Type | Behavior | Timeout |
|-----------|----------|---------|
| **Read Lock** | Shared - multiple readers allowed | 30s default |
| **Write Lock** | Exclusive - blocks all other access | 30s default |
| **Upgrade** | Read → Write with atomic handoff | 30s |

**Conflict Detection**:
- Write-write conflicts: Blocked, queued
- Read-write conflicts: Writers wait for readers
- Deadlock prevention: Timeout-based release

### Dependency Handling

| Feature | Description |
|---------|-------------|
| **Circular Detection** | DFS-based cycle detection before scheduling |
| **Topological Sort** | Tasks ordered by dependency level |
| **Write-Conflict Detection** | Identify tasks writing same file |
| **Dependency Pruning** | Remove redundant transitive dependencies |

### Track-Based Execution

| Setting | Value | Description |
|---------|-------|-------------|
| **Max Tracks** | 3 | Maximum concurrent execution tracks |
| **Min Tracks** | 2 | Minimum tracks for parallel execution |
| **Load Balancing** | Round-robin | Tasks distributed evenly |
| **Budget Split** | Even | Each track gets equal budget allocation |

### Batch Scheduling

| Rule | Value | Description |
|------|-------|-------------|
| **Max Batch Size** | 5 | Maximum tasks per batch |
| **Dependency Level** | Auto | Tasks grouped by dependency depth |
| **Execution Order** | Sequential | Batches run sequentially, tasks in parallel |

### Dry-Run Support

```typescript
// Preview execution plan without running
const plan = executor.getDryRunPlan(tasks);
// Returns: { batches, estimatedDuration, trackAssignments, conflicts }
```

---

## 🧪 Test Results

```
Test Files  56 passed (56)
     Tests  1914 passed | 1 skipped (1915)
  Duration  25.21s
```

### New Tests Added (60 tests)

| Test File | Tests | Coverage |
|-----------|-------|----------|
| `tests/infra/file-lock.test.ts` | ~20 | Lock acquisition, release, timeout, conflicts |
| `tests/agents/parallel/dependency-graph.test.ts` | ~15 | Graph operations, cycles, topological sort |
| `tests/agents/parallel/track-manager.test.ts` | ~10 | Track lifecycle, load balancing |
| `tests/agents/parallel/parallel-executor.test.ts` | ~15 | E2E execution, batching, error handling |

---

## 📁 File Structure

```
src/infra/
├── file-lock.ts        ✅ Read/write locks with timeout
└── index.ts            ✅ Exports

src/agents/parallel/
├── dependency-graph.ts      ✅ Task dependency tracking
├── track-manager.ts         ✅ Concurrent execution tracks
├── dependency-scheduler.ts  ✅ Batch scheduling
├── parallel-executor.ts     ✅ Promise.all execution
└── index.ts                 ✅ Exports

src/agents/
└── types.ts                 ✅ ParallelTask, ExecutionTrack, etc.

tests/infra/
└── file-lock.test.ts        ✅ ~20 tests

tests/agents/parallel/
├── dependency-graph.test.ts   ✅ ~15 tests
├── track-manager.test.ts      ✅ ~10 tests
└── parallel-executor.test.ts  ✅ ~15 tests
```

---

## 🎯 Success Criteria

### Sprint 40 Complete When:

- [x] File Lock Manager implemented ✅
- [x] Dependency Graph with cycle detection ✅
- [x] Track Manager for concurrent execution ✅
- [x] Dependency Scheduler with batching ✅
- [x] Parallel Executor with Promise.all ✅
- [x] Types added to agents/types.ts ✅
- [x] All 1,914 tests passing ✅
- [x] 60 new tests added ✅

**Final Progress**: 100% implementation

---

## 🔄 Integration Points

### Ready to Integrate With

| Component | Integration |
|-----------|-------------|
| **ResourceRouter** (S38) | Route parallel tasks to providers |
| **BudgetTracker** (S36) | Track budget across parallel tracks |
| **MultiModelOrchestrator** (S39) | Parallel provider queries |
| **QualityGates** (S39) | Validate each parallel task |
| **CostOptimizer** (S39) | Budget-aware track allocation |

### Future Integration

| Component | Purpose |
|-----------|---------|
| **FixLogger** (S41+) | Log parallel fix attempts |
| **SessionManager** | Persist parallel execution state |
| **EscalationRouter** | Parallel failure escalation |

---

## 💡 Usage Examples

### Basic Parallel Execution

```typescript
import { ParallelExecutor } from '@agents/parallel';

const executor = new ParallelExecutor({ maxTracks: 3 });

const tasks: ParallelTask[] = [
  {
    id: 'task1',
    name: 'Lint files',
    reads: ['src/**/*.ts'],
    writes: [],
    dependsOn: [],
    execute: async () => runLint(),
  },
  {
    id: 'task2',
    name: 'Run tests',
    reads: ['src/**/*.ts', 'tests/**/*.ts'],
    writes: ['coverage/'],
    dependsOn: ['task1'],  // Depends on lint
    execute: async () => runTests(),
  },
  {
    id: 'task3',
    name: 'Build',
    reads: ['src/**/*.ts'],
    writes: ['dist/'],
    dependsOn: ['task1'],  // Depends on lint, parallel with tests
    execute: async () => runBuild(),
  },
];

const result = await executor.execute(tasks);
// task1 runs first (batch 1)
// task2 and task3 run in parallel (batch 2)
```

### Dry-Run Preview

```typescript
const plan = executor.getDryRunPlan(tasks);
// {
//   batches: [
//     { batchNumber: 1, tasks: ['task1'], dependencyLevel: 0 },
//     { batchNumber: 2, tasks: ['task2', 'task3'], dependencyLevel: 1 },
//   ],
//   estimatedDuration: 5000,
//   trackAssignments: { task1: 'track-1', task2: 'track-1', task3: 'track-2' },
//   conflicts: [],
// }
```

---

## 🚀 Sprint 41 Preview

Based on the Autonomy Epic plan, Sprint 41 will focus on:

### Fix Logging & Learning Engine (Originally Sprint 40)
- Store fix attempt results with context
- Learn from successful/failed patterns
- Auto-routing based on historical data
- Pattern recognition for error fixes
- Adaptive quality threshold tuning

### Estimated Scope
- **LOC**: ~400 (fix-logger.ts, fix-stats.ts)
- **Files**: `src/agents/fix-logger.ts`, `src/cli/commands/fix-stats.ts`
- **Tests**: ~40 tests
- **Duration**: 5-7 days

---

## 📊 Sprint Progress Summary

| Sprint | Focus | Status | Tests Added |
|--------|-------|--------|-------------|
| **Sprint 38** | Multi-Provider Architecture | ✅ Complete | +88 |
| **Sprint 39** | Multi-Model Orchestration | ✅ Complete | +163 |
| **Sprint 40** | Parallel Execution | ✅ Complete | +60 |
| **Total** | | | **+311** |

**Cumulative Test Coverage**: 1,914 tests (56 files)

---

*Sprint 40 Status - Parallel Execution Infrastructure*
*Completed: 2026-02-23*
