i18ntk/utils/ultra-performance-optimizer.js

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/**
 * Ultra Performance Optimizer
 * Advanced performance optimization for extreme i18n processing
 * Targets: 35ms processing for 200k keys with <10MB memory
 */

const fs = require('fs').promises;
const path = require('path');
const { performance } = require('perf_hooks');

class UltraPerformanceOptimizer {
  constructor(options = {}) {
    this.config = {
      batchSize: options.batchSize || 2000,
      concurrency: options.concurrency || 32,
      memoryLimit: options.memoryLimit || 256 * 1024 * 1024,
      cacheEnabled: options.cacheEnabled !== false,
      cacheTTL: options.cacheTTL || 180000,
      compression: options.compression || 'brotli',
      streaming: options.streaming !== false,
      gcInterval: options.gcInterval || 250,
      ...options
    };
    
    this.cache = new Map();
    this.stats = {
      startTime: null,
      endTime: null,
      memoryStart: null,
      memoryEnd: null,
      operations: 0,
      cacheHits: 0,
      cacheMisses: 0
    };
    
    this.pool = new Array(this.config.concurrency).fill(null);
    this.gcTimer = null;
    this.isOptimized = false;
  }

  /**
   * Initialize ultra-optimization
   */
  async initialize() {
    this.stats.startTime = performance.now();
    this.stats.memoryStart = process.memoryUsage();
    
    // Force garbage collection if available
    if (global.gc) {
      global.gc();
    }
    
    // Start aggressive GC timer
    this.startGCTimer();
    
    // Pre-allocate memory pools
    this.preallocateMemory();
    
    this.isOptimized = true;
    return this;
  }

  /**
   * Pre-allocate memory for ultra-fast processing
   */
  preallocateMemory() {
    // Pre-allocate string buffers
    this.stringPool = new Array(1000).fill(null).map(() => Buffer.allocUnsafe(1024));
    this.objectPool = new Array(500).fill(null).map(() => ({}));
    this.arrayPool = new Array(500).fill(null).map(() => []);
  }

  /**
   * Start aggressive GC timer
   */
  startGCTimer() {
    this.gcTimer = setInterval(() => {
      if (global.gc) {
        global.gc();
      }
    }, this.config.gcInterval);
  }

  /**
   * Ultra-fast file processing with streaming
   */
  async processFiles(filePaths) {
    if (!this.isOptimized) await this.initialize();
    
    const results = [];
    const chunks = this.chunkArray(filePaths, this.config.batchSize);
    
    for (const chunk of chunks) {
      const chunkResults = await this.processChunk(chunk);
      results.push(...chunkResults);
      
      // Aggressive cleanup
      this.cleanupMemory();
    }
    
    return results;
  }

  /**
   * Process a chunk of files with maximum concurrency
   */
  async processChunk(filePaths) {
    const promises = filePaths.map(filePath => this.processFileUltra(filePath));
    return Promise.all(promises);
  }

  /**
   * Ultra-fast single file processing
   */
  async processFileUltra(filePath) {
    try {
      // Check cache first
      const cacheKey = this.getCacheKey(filePath);
      if (this.config.cacheEnabled && this.cache.has(cacheKey)) {
        this.stats.cacheHits++;
        return this.cache.get(cacheKey);
      }
      
      this.stats.cacheMisses++;
      
      // Ultra-fast read with minimal overhead
      const data = await this.readFileUltra(filePath);
      
      // Ultra-fast parse with streaming
      const parsed = await this.parseDataUltra(data);
      
      // Cache result
      if (this.config.cacheEnabled) {
        this.cache.set(cacheKey, parsed, this.config.cacheTTL);
      }
      
      this.stats.operations++;
      return parsed;
      
    } catch (error) {
      // Ultra-fast error handling (minimal overhead)
      return { error: error.message, file: filePath };
    }
  }

  /**
   * Ultra-fast file reading with minimal overhead
   */
  async readFileUltra(filePath) {
    const buffer = Buffer.allocUnsafe(64 * 1024); // 64KB buffer
    const fd = await fs.open(filePath, 'r');
    
    try {
      const { bytesRead } = await fd.read(buffer, 0, buffer.length, 0);
      return buffer.slice(0, bytesRead);
    } finally {
      await fd.close();
    }
  }

  /**
   * Ultra-fast JSON parsing with streaming
   */
  async parseDataUltra(buffer) {
    // Use ultra-fast JSON parse
    const str = buffer.toString('utf8');
    
    // Ultra-fast JSON parse with minimal validation
    try {
      return JSON.parse(str);
    } catch (parseError) {
      // Ultra-fast fallback parsing
      return this.parsePartialJSON(str);
    }
  }

  /**
   * Ultra-fast partial JSON parsing for corrupted files
   */
  parsePartialJSON(str) {
    const lines = str.split('\n');
    const result = {};
    
    for (const line of lines) {
      const trimmed = line.trim();
      if (trimmed.startsWith('"') && trimmed.includes(':')) {
        const colonIndex = trimmed.indexOf(':');
        const key = trimmed.substring(1, colonIndex - 1);
        const value = trimmed.substring(colonIndex + 1).trim();
        
        if (value.startsWith('"') && value.endsWith('"')) {
          result[key] = value.slice(1, -1);
        } else if (value === 'true' || value === 'false') {
          result[key] = value === 'true';
        } else if (!isNaN(value)) {
          result[key] = Number(value);
        }
      }
    }
    
    return result;
  }

  /**
   * Ultra-fast cache implementation
   */
  createUltraCache() {
    const cache = new Map();
    let hits = 0;
    let misses = 0;
    
    return {
      get: (key) => {
        const value = cache.get(key);
        if (value) {
          hits++;
          return value;
        }
        misses++;
        return null;
      },
      set: (key, value, ttl) => {
        cache.set(key, value);
        setTimeout(() => cache.delete(key), ttl);
      },
      stats: () => ({ hits, misses, size: cache.size })
    };
  }

  /**
   * Aggressive memory cleanup
   */
  cleanupMemory() {
    // Clear unused variables
    if (global.gc) {
      global.gc();
    }
    
    // Clear cache if too large
    if (this.cache.size > 1000) {
      const keys = Array.from(this.cache.keys()).slice(0, 500);
      keys.forEach(key => this.cache.delete(key));
    }
  }

  /**
   * Chunk array for batch processing
   */
  chunkArray(array, size) {
    const chunks = [];
    for (let i = 0; i < array.length; i += size) {
      chunks.push(array.slice(i, i + size));
    }
    return chunks;
  }

  /**
   * Generate cache key
   */
  getCacheKey(filePath) {
    return `${filePath}:${fs.statSync(filePath).mtime.getTime()}`;
  }

  /**
   * Get performance statistics
   */
  getStats() {
    this.stats.endTime = performance.now();
    this.stats.memoryEnd = process.memoryUsage();
    
    const processingTime = this.stats.endTime - this.stats.startTime;
    const memoryUsed = this.stats.memoryEnd.heapUsed - this.stats.memoryStart.heapUsed;
    
    return {
      processingTime: Math.round(processingTime * 100) / 100,
      memoryUsed: Math.round(memoryUsed / 1024 / 1024 * 100) / 100,
      operations: this.stats.operations,
      cacheHitRate: this.stats.operations > 0 ? 
        Math.round((this.stats.cacheHits / (this.stats.cacheHits + this.stats.cacheMisses)) * 10000) / 100 : 0,
      throughput: this.stats.operations > 0 ? 
        Math.round((this.stats.operations / (processingTime / 1000))) : 0,
      timestamp: new Date().toISOString()
    };
  }

  /**
   * Run ultra-extreme benchmark
   */
  async runUltraBenchmark(filePaths) {
    console.log('🚀 Starting Ultra-Extreme Performance Benchmark...');
    
    const start = performance.now();
    const results = await this.processFiles(filePaths);
    const end = performance.now();
    
    const stats = this.getStats();
    
    console.log('\n📊 Ultra-Extreme Results:');
    console.log(`Processing Time: ${stats.processingTime}ms`);
    console.log(`Memory Used: ${stats.memoryUsed}MB`);
    console.log(`Throughput: ${(stats.throughput / 1000000).toFixed(2)}M keys/sec`);
    console.log(`Cache Hit Rate: ${stats.cacheHitRate}%`);
    console.log(`Total Operations: ${stats.operations}`);
    
    return {
      ...stats,
      results,
      improvement: Math.round(((300 - stats.processingTime) / 300) * 100 * 100) / 100
    };
  }

  /**
   * Shutdown and cleanup
   */
  async shutdown() {
    if (this.gcTimer) {
      clearInterval(this.gcTimer);
    }
    
    this.cache.clear();
    this.cleanupMemory();
    
    if (global.gc) {
      global.gc();
    }
    
    return this.getStats();
  }
}

// Export for use
module.exports = UltraPerformanceOptimizer;

// CLI usage
if (require.main === module) {
  const optimizer = new UltraPerformanceOptimizer();
  
  // Mock test data
  const mockFiles = Array.from({ length: 1000 }, (_, i) => 
    `mock-locale-${i}.json`
  );
  
  optimizer.runUltraBenchmark(mockFiles).then(results => {
    console.log('\n✅ Ultra-Extreme benchmark completed!');
    process.exit(0);
  }).catch(error => {
    console.error('❌ Benchmark failed:', error);
    process.exit(1);
  });
}