Engineering Specifications¶

System Requirements¶

1. Performance Targets¶

Scalable CSV processing
Efficient route optimization
Responsive user interface

2. Technical Requirements¶

File Processing¶

interface FileRequirements {
  maxFileSize: 5 * 1024 * 1024;  // 5MB
  allowedTypes: ['.csv'];
  maxRows: 1000;
  chunkSize: 1024 * 50;          // 50KB chunks
  workerThreads: 4;              // Parallel processing
}

interface ValidationRules {
  requiredFields: [
    'pickup_address',
    'delivery_address',
    'time_window',
    'priority'
  ];
  addressMaxLength: 200;
  timeWindowFormat: 'HH:mm-HH:mm';
  priorityRange: { min: 1, max: 5 };
}

Route Optimization¶

interface OptimizationParams {
  maxOrdersPerGroup: 20;
  maxDistanceKm: 5;
  maxTotalDistance: 50;          // km per group
  maxTimeWindow: 4;              // hours
  restStopMinutes: 15;          // per 4 hours

  weights: {
    distance: 1.0;
    timeWindow: 2.0;
    priority: 1.5;
  };

  traffic: {
    peakHours: [8, 9, 17, 18];
    peakMultiplier: 1.5;
  };
}

User Interface¶

interface UIRequirements {
  mapUpdateInterval: 500;        // ms
  progressUpdateInterval: 200;   // ms
  minimumInteractionDelay: 16;   // ms (60fps)

  responsive: {
    mobile: 320;                // px
    tablet: 768;
    desktop: 1024;
    widescreen: 1440;
  };
}

System Architecture¶

1. Component Interaction¶

sequenceDiagram
    participant UI as User Interface
    participant FP as File Processor
    participant VE as Validation Engine
    participant RO as Route Optimizer
    participant EX as External Services

    UI->>FP: Upload File
    FP->>VE: Stream Chunks
    VE->>EX: Validate Addresses
    EX-->>VE: Validation Results
    VE->>RO: Valid Orders
    RO->>EX: Get Distances
    EX-->>RO: Distance Matrix
    RO->>RO: Optimize Routes
    RO-->>UI: Route Groups

2. Data Flow¶

graph TD
    subgraph "Input Layer"
        A[CSV File] -->|Stream| B[Parser]
        B -->|Chunks| C[Validator]
    end

    subgraph "Processing Layer"
        C -->|Valid Data| D[Geocoder]
        D -->|Coordinates| E[Distance Calculator]
        E -->|Matrix| F[Route Optimizer]
    end

    subgraph "Output Layer"
        F -->|Groups| G[Map View]
        G -->|Interactive| H[Editor]
        H -->|Final| I[Export]
    end

    style A fill:#f9f,stroke:#333
    style D fill:#bbf,stroke:#333
    style G fill:#bfb,stroke:#333

Integration Points¶

1. External Services¶

Geocoding Service¶

interface GeocodingConfig {
  provider: 'google' | 'mapbox';
  rateLimit: 50;                // requests per second
  cacheExpiry: 7 * 24 * 3600;  // 7 days in seconds
  timeout: 5000;               // ms
}

Map Services¶

interface MapConfig {
  provider: 'google' | 'mapbox';
  updateInterval: 500;         // ms
  maxMarkers: 1000;
  clustering: true;
  styles: MapStyle[];
}

Distance Matrix¶

interface DistanceConfig {
  provider: 'google' | 'mapbox';
  batchSize: 25;              // addresses per request
  cacheExpiry: 24 * 3600;    // 1 day in seconds
  timeout: 10000;            // ms
}

2. Internal Systems¶

State Management¶

interface StateConfig {
  persistence: 'local' | 'session';
  syncInterval: 1000;         // ms
  maxHistorySize: 50;        // actions
  cleanupInterval: 300000;   // 5 minutes
}

Cache Management¶

interface CacheConfig {
  strategy: 'lru' | 'fifo';
  maxSize: 1000;             // entries
  cleanupInterval: 3600000;  // 1 hour
  persistenceKey: string;
}

Error Handling¶

1. Error Types¶

type SystemError =
  | 'FILE_TOO_LARGE'
  | 'INVALID_FORMAT'
  | 'NETWORK_ERROR'
  | 'PROCESSING_ERROR'
  | 'OPTIMIZATION_ERROR';

interface ErrorConfig {
  retryAttempts: 3;
  retryDelay: 1000;          // ms
  fallbackStrategy: 'cache' | 'default';
  errorReporting: boolean;
}

2. Recovery Strategy¶

stateDiagram-v2
    [*] --> Normal
    Normal --> Error: System Error
    Error --> Retry: Attempt Recovery
    Retry --> Normal: Success
    Retry --> Fallback: Max Retries
    Fallback --> [*]

Performance Optimization¶

1. Processing Strategy¶

interface ProcessingConfig {
  chunkProcessing: true;
  parallelization: true;
  workerThreads: 4;
  batchSize: 100;            // items per batch

  optimization: {
    earlyTermination: true;
    approximation: 0.95;     // 95% optimal
    timeLimit: 30000;        // ms
  };
}

2. Memory Management¶

interface MemoryConfig {
  maxHeapUsage: 512;         // MB
  garbageCollection: 'auto';
  cleanupThreshold: 0.8;     // 80% usage

  monitoring: {
    enabled: true;
    interval: 60000;         // ms
    alertThreshold: 0.9;     // 90% usage
  };
}

Development Guidelines¶

1. Code Quality¶

TypeScript for type safety
ESLint for code style
Jest for testing
80% test coverage minimum

2. Performance Metrics¶

< 2s initial load time
< 100ms interaction response
< 5s processing time for 100 orders
< 16ms frame time (60fps)

3. Security Requirements¶

HTTPS only
API key encryption
XSS prevention
CSRF protection

Next Steps¶

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Last Updated: 2024-12-20T08:05:42+08:00