Chapter 6: 가족 연결 기능

// Example System Implementation
class MemoryAssistanceSystem {
  constructor(config) {
    this.config = config;
    this.isInitialized = false;
    this.version = '1.0.0';
    this.components = {};
  }

  async initialize() {
    console.log('Initializing memory assistance system...');
    
    await this.loadUserPreferences();
    await this.initializeComponents();
    await this.startServices();
    
    this.isInitialized = true;
    console.log('System ready');
    return this;
  }

  async loadUserPreferences() {
    const preferences = await this.storage.get('user_preferences');
    this.applyPreferences(preferences);
  }

  async initializeComponents() {
    this.components = {
      ui: new UserInterface(this.config.ui),
      api: new APIClient(this.config.api),
      storage: new DataStorage(this.config.storage),
      notifications: new NotificationService(this.config.notifications),
      analytics: new AnalyticsService(this.config.analytics)
    };
  }

  async startServices() {
    await Promise.all([
      this.components.notifications.start(),
      this.components.api.connect(),
      this.schedulePeriodicTasks()
    ]);
  }

  async schedulePeriodicTasks() {
    setInterval(() => this.syncData(), 300000); // Every 5 minutes
    setInterval(() => this.checkReminders(), 60000); // Every minute
    setInterval(() => this.updateHealthMetrics(), 600000); // Every 10 minutes
  }
}

// Performance Optimization
class PerformanceOptimizer {
  constructor() {
    this.cache = new Map();
    this.metrics = {};
  }

  async optimizeQuery(query) {
    const startTime = Date.now();
    
    const cached = this.cache.get(query.id);
    if (cached && !this.isStale(cached)) {
      this.recordMetric('cache_hit', Date.now() - startTime);
      return cached.data;
    }
    
    const result = await this.executeWithTimeout(query, 5000);
    
    this.cache.set(query.id, {
      data: result,
      timestamp: Date.now()
    });
    
    this.recordMetric('query_execution', Date.now() - startTime);
    return result;
  }

  async executeWithTimeout(query, timeout) {
    return Promise.race([
      this.execute(query),
      new Promise((_, reject) => 
        setTimeout(() => reject(new Error('Timeout')), timeout)
      )
    ]);
  }

  recordMetric(name, value) {
    if (!this.metrics[name]) {
      this.metrics[name] = [];
    }
    this.metrics[name].push(value);
    
    if (this.metrics[name].length > 1000) {
      this.metrics[name].shift();
    }
  }

  getPerformanceReport() {
    const report = {};
    for (const [metric, values] of Object.entries(this.metrics)) {
      const avg = values.reduce((a, b) => a + b, 0) / values.length;
      const p95 = this.percentile(values, 95);
      const p99 = this.percentile(values, 99);
      
      report[metric] = { avg, p95, p99, count: values.length };
    }
    return report;
  }

  percentile(values, p) {
    const sorted = values.slice().sort((a, b) => a - b);
    const index = Math.ceil(sorted.length * p / 100) - 1;
    return sorted[index];
  }
}