figma-restoration-mcp-vue-tools/src/utils/error-recovery-strategies.js

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import fs from 'fs/promises';
import { exec } from 'child_process';
import { promisify } from 'util';

const execAsync = promisify(exec);

/**
 * Error Recovery Strategies - Tool-specific error recovery with actionable suggestions
 */
export class ErrorRecoveryStrategies {
  constructor() {
    this.strategies = new Map();
    this.initializeStrategies();
  }

  /**
   * Initialize all error recovery strategies
   */
  initializeStrategies() {
    // File system error recovery
    this.strategies.set('FileSystem', {
      handler: this.handleFileSystemError.bind(this),
      checker: this.checkFileSystemHealth.bind(this),
      description: 'File system error recovery with path validation and permission checks'
    });

    // Network error recovery
    this.strategies.set('Network', {
      handler: this.handleNetworkError.bind(this),
      checker: this.checkNetworkConnectivity.bind(this),
      description: 'Network error recovery with connectivity checks and retry logic'
    });

    // Browser error recovery
    this.strategies.set('Browser', {
      handler: this.handleBrowserError.bind(this),
      checker: this.checkBrowserInstallation.bind(this),
      description: 'Browser error recovery with installation and resource checks'
    });

    // Image processing error recovery
    this.strategies.set('ImageProcessing', {
      handler: this.handleImageProcessingError.bind(this),
      checker: this.checkImageProcessingCapabilities.bind(this),
      description: 'Image processing error recovery with format validation'
    });

    // Library-specific error recovery
    this.strategies.set('Library', {
      handler: this.handleLibraryError.bind(this),
      checker: this.checkLibraryDependencies.bind(this),
      description: 'Library-specific error recovery with fallback options'
    });
  }

  /**
   * Get recovery strategy for error category
   * @param {string} category - Error category
   * @param {Error} error - Original error
   * @param {Object} context - Error context
   * @returns {Promise<Object>} - Recovery strategy result
   */
  async getRecoveryStrategy(category, error, context = {}) {
    const strategy = this.strategies.get(category);
    
    if (!strategy) {
      return {
        canRecover: false,
        suggestions: ['No specific recovery strategy available for this error type'],
        actions: [],
        fallbackOptions: []
      };
    }

    try {
      const result = await strategy.handler(error, context);
      return {
        ...result,
        category,
        strategy: strategy.description
      };
    } catch (recoveryError) {
      return {
        canRecover: false,
        suggestions: [
          'Error recovery strategy failed',
          `Recovery error: ${recoveryError.message}`,
          'Please try manual intervention'
        ],
        actions: [],
        fallbackOptions: ['Manual troubleshooting required']
      };
    }
  }

  /**
   * Check system health for all categories
   * @returns {Promise<Object>} - System health report
   */
  async checkSystemHealth() {
    const healthChecks = {};
    
    for (const [category, strategy] of this.strategies) {
      try {
        healthChecks[category] = await strategy.checker();
      } catch (error) {
        healthChecks[category] = {
          healthy: false,
          issues: [`Health check failed: ${error.message}`],
          recommendations: ['Manual system check required']
        };
      }
    }

    return {
      timestamp: new Date().toISOString(),
      overallHealth: this.calculateOverallHealth(healthChecks),
      categories: healthChecks
    };
  }

  // File System Error Recovery

  /**
   * Handle file system errors
   * @param {Error} error - File system error
   * @param {Object} context - Error context
   * @returns {Promise<Object>} - Recovery strategy
   */
  async handleFileSystemError(error, context) {
    const { code, path: errorPath } = error;
    const suggestions = [];
    const actions = [];
    const fallbackOptions = [];

    switch (code) {
      case 'ENOENT':
        suggestions.push(
          `File or directory not found: ${errorPath}`,
          'Verify the file path is correct and the file exists',
          'Check if the file was moved or deleted'
        );
        actions.push(
          { type: 'checkPath', path: errorPath },
          { type: 'createDirectory', path: this.getDirectoryPath(errorPath) }
        );
        fallbackOptions.push(
          'Create the missing file or directory',
          'Use an alternative file path',
          'Skip this operation if not critical'
        );
        break;

      case 'EACCES':
      case 'EPERM':
        suggestions.push(
          `Permission denied: ${errorPath}`,
          'Check file and directory permissions',
          'Ensure the process has read/write access'
        );
        actions.push(
          { type: 'checkPermissions', path: errorPath },
          { type: 'fixPermissions', path: errorPath }
        );
        fallbackOptions.push(
          'Run with elevated privileges',
          'Change file ownership or permissions',
          'Use a different location with proper permissions'
        );
        break;

      case 'ENOSPC':
        suggestions.push(
          'Insufficient disk space',
          'Free up disk space by removing unnecessary files',
          'Move files to a location with more available space'
        );
        actions.push(
          { type: 'checkDiskSpace' },
          { type: 'cleanupTempFiles' }
        );
        fallbackOptions.push(
          'Use external storage',
          'Compress existing files',
          'Use a different disk or partition'
        );
        break;

      case 'EMFILE':
      case 'ENFILE':
        suggestions.push(
          'Too many open files',
          'Close unused file handles',
          'Increase system file descriptor limits'
        );
        actions.push(
          { type: 'checkOpenFiles' },
          { type: 'closeUnusedHandles' }
        );
        fallbackOptions.push(
          'Process files in smaller batches',
          'Restart the application',
          'Increase system limits'
        );
        break;

      default:
        suggestions.push(
          `File system error: ${error.message}`,
          'Check file system integrity',
          'Verify file paths and permissions'
        );
        actions.push(
          { type: 'generalFileSystemCheck' }
        );
        fallbackOptions.push(
          'Try alternative file operations',
          'Use different file paths',
          'Manual file system repair'
        );
    }

    return {
      canRecover: code !== 'ENOSPC' && code !== 'ENOENT', // Disk space and file not found issues need manual intervention
      suggestions,
      actions,
      fallbackOptions,
      severity: this.getFileSystemErrorSeverity(code)
    };
  }

  /**
   * Check file system health
   * @returns {Promise<Object>} - File system health status
   */
  async checkFileSystemHealth() {
    const issues = [];
    const recommendations = [];

    try {
      // Check current working directory access
      await fs.access(process.cwd(), fs.constants.R_OK | fs.constants.W_OK);
    } catch (error) {
      issues.push('Cannot access current working directory');
      recommendations.push('Check directory permissions');
    }

    try {
      // Check temp directory access
      const tempDir = process.env.TMPDIR || '/tmp';
      await fs.access(tempDir, fs.constants.R_OK | fs.constants.W_OK);
    } catch (error) {
      issues.push('Cannot access temporary directory');
      recommendations.push('Check temp directory permissions');
    }

    // Check disk space (simplified check)
    try {
      const stats = await fs.stat(process.cwd());
      if (stats) {
        // Basic check passed
      }
    } catch (error) {
      issues.push('File system access issues detected');
      recommendations.push('Run file system check');
    }

    return {
      healthy: issues.length === 0,
      issues,
      recommendations
    };
  }

  // Network Error Recovery

  /**
   * Handle network errors
   * @param {Error} error - Network error
   * @param {Object} context - Error context
   * @returns {Promise<Object>} - Recovery strategy
   */
  async handleNetworkError(error, context) {
    const { code, hostname, port } = error;
    const suggestions = [];
    const actions = [];
    const fallbackOptions = [];

    switch (code) {
      case 'ETIMEDOUT':
        suggestions.push(
          'Network request timed out',
          'Check network connectivity',
          'Increase timeout settings if network is slow'
        );
        actions.push(
          { type: 'checkConnectivity' },
          { type: 'pingHost', hostname },
          { type: 'retryWithBackoff', maxRetries: 3 }
        );
        fallbackOptions.push(
          'Use alternative network endpoint',
          'Switch to offline mode if available',
          'Cache previous results'
        );
        break;

      case 'ECONNREFUSED':
        suggestions.push(
          `Connection refused by ${hostname}:${port}`,
          'Verify the server is running and accessible',
          'Check firewall settings'
        );
        actions.push(
          { type: 'checkPort', hostname, port },
          { type: 'checkFirewall' },
          { type: 'tryAlternativePort' }
        );
        fallbackOptions.push(
          'Use alternative server endpoint',
          'Contact server administrator',
          'Use cached data if available'
        );
        break;

      case 'ENOTFOUND':
        suggestions.push(
          `Host not found: ${hostname}`,
          'Check DNS settings and hostname spelling',
          'Verify internet connectivity'
        );
        actions.push(
          { type: 'checkDNS', hostname },
          { type: 'checkConnectivity' },
          { type: 'tryAlternativeHost' }
        );
        fallbackOptions.push(
          'Use IP address instead of hostname',
          'Use alternative DNS servers',
          'Work in offline mode'
        );
        break;

      case 'ECONNRESET':
        suggestions.push(
          'Connection was reset by the server',
          'Server may be overloaded or restarting',
          'Try again after a short delay'
        );
        actions.push(
          { type: 'retryWithDelay', delay: 5000 },
          { type: 'checkServerStatus', hostname }
        );
        fallbackOptions.push(
          'Use alternative server',
          'Reduce request frequency',
          'Implement connection pooling'
        );
        break;

      default:
        suggestions.push(
          `Network error: ${error.message}`,
          'Check network connectivity and settings',
          'Verify server availability'
        );
        actions.push(
          { type: 'generalNetworkCheck' }
        );
        fallbackOptions.push(
          'Use alternative network configuration',
          'Work in offline mode',
          'Contact network administrator'
        );
    }

    return {
      canRecover: true, // Most network errors are recoverable
      suggestions,
      actions,
      fallbackOptions,
      severity: this.getNetworkErrorSeverity(code),
      retryable: true,
      retryDelay: this.getNetworkRetryDelay(code)
    };
  }

  /**
   * Check network connectivity
   * @returns {Promise<Object>} - Network health status
   */
  async checkNetworkConnectivity() {
    const issues = [];
    const recommendations = [];

    try {
      // Simple connectivity check using DNS lookup
      const { stdout } = await execAsync('nslookup google.com', { timeout: 5000 });
      if (!stdout.includes('Address:')) {
        issues.push('DNS resolution issues detected');
        recommendations.push('Check DNS settings');
      }
    } catch (error) {
      issues.push('Network connectivity issues detected');
      recommendations.push('Check internet connection');
    }

    return {
      healthy: issues.length === 0,
      issues,
      recommendations
    };
  }

  // Browser Error Recovery

  /**
   * Handle browser errors
   * @param {Error} error - Browser error
   * @param {Object} context - Error context
   * @returns {Promise<Object>} - Recovery strategy
   */
  async handleBrowserError(error, context) {
    const suggestions = [];
    const actions = [];
    const fallbackOptions = [];
    const errorMessage = error.message.toLowerCase();

    if (errorMessage.includes('chrome') || errorMessage.includes('chromium')) {
      suggestions.push(
        'Chrome/Chromium browser issues detected',
        'Ensure Chrome or Chromium is installed and accessible',
        'Check browser version compatibility'
      );
      actions.push(
        { type: 'checkChromeInstallation' },
        { type: 'updateChrome' },
        { type: 'clearChromeCache' }
      );
      fallbackOptions.push(
        'Install Chrome or Chromium browser',
        'Use alternative browser (Firefox, Safari)',
        'Use headless browser alternatives'
      );
    } else if (errorMessage.includes('timeout') || errorMessage.includes('navigation')) {
      suggestions.push(
        'Browser navigation or timeout issues',
        'Increase page load timeout settings',
        'Check if target website is accessible'
      );
      actions.push(
        { type: 'increaseTimeout' },
        { type: 'checkWebsiteStatus' },
        { type: 'clearBrowserData' }
      );
      fallbackOptions.push(
        'Use alternative URL or endpoint',
        'Implement retry logic with exponential backoff',
        'Use static content instead of dynamic loading'
      );
    } else if (errorMessage.includes('memory') || errorMessage.includes('resource')) {
      suggestions.push(
        'Browser resource or memory issues',
        'Close other browser instances',
        'Increase available system memory'
      );
      actions.push(
        { type: 'closeBrowserInstances' },
        { type: 'clearMemory' },
        { type: 'reduceBrowserOptions' }
      );
      fallbackOptions.push(
        'Use lighter browser configuration',
        'Process pages in smaller batches',
        'Use server-side rendering alternatives'
      );
    } else {
      suggestions.push(
        `Browser error: ${error.message}`,
        'Check browser installation and configuration',
        'Verify browser compatibility'
      );
      actions.push(
        { type: 'generalBrowserCheck' }
      );
      fallbackOptions.push(
        'Reinstall browser',
        'Use alternative automation tools',
        'Switch to API-based alternatives'
      );
    }

    return {
      canRecover: true,
      suggestions,
      actions,
      fallbackOptions,
      severity: 'medium',
      requiresUserAction: errorMessage.includes('install')
    };
  }

  /**
   * Check browser installation
   * @returns {Promise<Object>} - Browser health status
   */
  async checkBrowserInstallation() {
    const issues = [];
    const recommendations = [];

    try {
      // Check if Chrome/Chromium is available
      await execAsync('which google-chrome || which chromium-browser || which chrome', { timeout: 3000 });
    } catch (error) {
      issues.push('Chrome/Chromium browser not found');
      recommendations.push('Install Chrome or Chromium browser');
    }

    return {
      healthy: issues.length === 0,
      issues,
      recommendations
    };
  }

  // Image Processing Error Recovery

  /**
   * Handle image processing errors
   * @param {Error} error - Image processing error
   * @param {Object} context - Error context
   * @returns {Promise<Object>} - Recovery strategy
   */
  async handleImageProcessingError(error, context) {
    const suggestions = [];
    const actions = [];
    const fallbackOptions = [];
    const errorMessage = error.message.toLowerCase();

    if (errorMessage.includes('unsupported') || errorMessage.includes('format')) {
      suggestions.push(
        'Unsupported image format detected',
        'Convert image to a supported format (PNG, JPEG, WebP)',
        'Verify image file is not corrupted'
      );
      actions.push(
        { type: 'validateImageFormat', path: context.imagePath },
        { type: 'convertImageFormat', path: context.imagePath, targetFormat: 'png' },
        { type: 'checkImageIntegrity', path: context.imagePath }
      );
      fallbackOptions.push(
        'Use alternative image processing library',
        'Skip image processing for this file',
        'Use original image without processing'
      );
    } else if (errorMessage.includes('memory') || errorMessage.includes('size')) {
      suggestions.push(
        'Image too large or memory issues',
        'Reduce image resolution or quality',
        'Process image in smaller chunks'
      );
      actions.push(
        { type: 'checkImageSize', path: context.imagePath },
        { type: 'resizeImage', path: context.imagePath, maxSize: 2048 },
        { type: 'optimizeMemoryUsage' }
      );
      fallbackOptions.push(
        'Use streaming image processing',
        'Process images in batches',
        'Use external image processing service'
      );
    } else if (errorMessage.includes('sharp') || errorMessage.includes('library')) {
      suggestions.push(
        'Image processing library issues',
        'Ensure Sharp library is properly installed',
        'Check library version compatibility'
      );
      actions.push(
        { type: 'checkSharpInstallation' },
        { type: 'reinstallSharp' },
        { type: 'useAlternativeLibrary' }
      );
      fallbackOptions.push(
        'Use alternative image processing library (Jimp, Canvas)',
        'Use system image processing tools',
        'Skip image processing operations'
      );
    } else {
      suggestions.push(
        `Image processing error: ${error.message}`,
        'Check image file integrity and format',
        'Verify image processing library installation'
      );
      actions.push(
        { type: 'generalImageCheck', path: context.imagePath }
      );
      fallbackOptions.push(
        'Use alternative image processing approach',
        'Skip problematic images',
        'Use pre-processed images'
      );
    }

    return {
      canRecover: true,
      suggestions,
      actions,
      fallbackOptions,
      severity: 'medium',
      retryable: !errorMessage.includes('format')
    };
  }

  /**
   * Check image processing capabilities
   * @returns {Promise<Object>} - Image processing health status
   */
  async checkImageProcessingCapabilities() {
    const issues = [];
    const recommendations = [];

    try {
      // Check if Sharp is available
      const sharp = await import('sharp');
      if (!sharp.default) {
        issues.push('Sharp library not properly loaded');
        recommendations.push('Reinstall Sharp library');
      }
    } catch (error) {
      issues.push('Sharp library not available');
      recommendations.push('Install Sharp library: npm install sharp');
    }

    return {
      healthy: issues.length === 0,
      issues,
      recommendations
    };
  }

  // Library Error Recovery

  /**
   * Handle library-specific errors
   * @param {Error} error - Library error
   * @param {Object} context - Error context
   * @returns {Promise<Object>} - Recovery strategy
   */
  async handleLibraryError(error, context) {
    const suggestions = [];
    const actions = [];
    const fallbackOptions = [];
    const errorMessage = error.message.toLowerCase();

    if (errorMessage.includes('sharp')) {
      suggestions.push(
        'Sharp library error detected',
        'Ensure Sharp is properly installed and compatible',
        'Check for native dependency issues'
      );
      actions.push(
        { type: 'checkSharpVersion' },
        { type: 'reinstallSharp' },
        { type: 'checkNativeDependencies' }
      );
      fallbackOptions.push(
        'Use Jimp as alternative image processing library',
        'Use Canvas API for image operations',
        'Use system image processing tools'
      );
    } else if (errorMessage.includes('svgo')) {
      suggestions.push(
        'SVGO library error detected',
        'Check SVG file format and validity',
        'Update SVGO to latest version'
      );
      actions.push(
        { type: 'validateSVG', path: context.svgPath },
        { type: 'updateSVGO' },
        { type: 'useFallbackSVGProcessor' }
      );
      fallbackOptions.push(
        'Use alternative SVG optimization tools',
        'Skip SVG optimization',
        'Use pre-optimized SVG files'
      );
    } else if (errorMessage.includes('puppeteer')) {
      suggestions.push(
        'Puppeteer library error detected',
        'Ensure Chrome/Chromium is properly installed',
        'Check Puppeteer version compatibility'
      );
      actions.push(
        { type: 'checkPuppeteerSetup' },
        { type: 'downloadChromium' },
        { type: 'updatePuppeteer' }
      );
      fallbackOptions.push(
        'Use Playwright as alternative browser automation',
        'Use Selenium WebDriver',
        'Use headless browser alternatives'
      );
    } else {
      suggestions.push(
        `Library error: ${error.message}`,
        'Check library installation and version',
        'Verify dependency compatibility'
      );
      actions.push(
        { type: 'checkLibraryVersions' },
        { type: 'updateDependencies' }
      );
      fallbackOptions.push(
        'Use alternative libraries',
        'Downgrade to compatible versions',
        'Implement custom solutions'
      );
    }

    return {
      canRecover: true,
      suggestions,
      actions,
      fallbackOptions,
      severity: 'high',
      requiresReinstall: errorMessage.includes('install') || errorMessage.includes('missing')
    };
  }

  /**
   * Check library dependencies
   * @returns {Promise<Object>} - Library health status
   */
  async checkLibraryDependencies() {
    const issues = [];
    const recommendations = [];

    // Check critical libraries
    const libraries = ['sharp', 'svgo', 'puppeteer'];
    
    for (const lib of libraries) {
      try {
        await import(lib);
      } catch (error) {
        issues.push(`${lib} library not available`);
        recommendations.push(`Install ${lib}: npm install ${lib}`);
      }
    }

    return {
      healthy: issues.length === 0,
      issues,
      recommendations
    };
  }

  // Helper Methods

  getDirectoryPath(filePath) {
    return filePath ? filePath.substring(0, filePath.lastIndexOf('/')) : '';
  }

  getFileSystemErrorSeverity(code) {
    const severityMap = {
      'ENOENT': 'medium',
      'EACCES': 'high',
      'EPERM': 'high',
      'ENOSPC': 'critical',
      'EMFILE': 'high',
      'ENFILE': 'high'
    };
    return severityMap[code] || 'medium';
  }

  getNetworkErrorSeverity(code) {
    const severityMap = {
      'ETIMEDOUT': 'medium',
      'ECONNREFUSED': 'high',
      'ENOTFOUND': 'high',
      'ECONNRESET': 'medium'
    };
    return severityMap[code] || 'medium';
  }

  getNetworkRetryDelay(code) {
    const delayMap = {
      'ETIMEDOUT': 3000,
      'ECONNREFUSED': 5000,
      'ENOTFOUND': 10000,
      'ECONNRESET': 2000
    };
    return delayMap[code] || 1000;
  }

  calculateOverallHealth(healthChecks) {
    const categories = Object.values(healthChecks);
    const healthyCount = categories.filter(check => check.healthy).length;
    const totalCount = categories.length;
    
    if (healthyCount === totalCount) return 'excellent';
    if (healthyCount >= totalCount * 0.8) return 'good';
    if (healthyCount >= totalCount * 0.6) return 'fair';
    if (healthyCount >= totalCount * 0.4) return 'poor';
    return 'critical';
  }

  /**
   * Execute recovery action
   * @param {Object} action - Recovery action to execute
   * @returns {Promise<Object>} - Action result
   */
  async executeRecoveryAction(action) {
    try {
      switch (action.type) {
        case 'checkPath':
          return await this.checkPathExists(action.path);
        case 'checkPermissions':
          return await this.checkFilePermissions(action.path);
        case 'checkConnectivity':
          return await this.testNetworkConnectivity();
        case 'retryWithBackoff':
          return { success: true, message: 'Retry logic configured' };
        default:
          return { success: false, message: `Unknown action type: ${action.type}` };
      }
    } catch (error) {
      return { success: false, message: `Action failed: ${error.message}` };
    }
  }

  async checkPathExists(path) {
    try {
      await fs.access(path);
      return { success: true, message: 'Path exists and is accessible' };
    } catch (error) {
      return { success: false, message: `Path not accessible: ${error.message}` };
    }
  }

  async checkFilePermissions(path) {
    try {
      await fs.access(path, fs.constants.R_OK | fs.constants.W_OK);
      return { success: true, message: 'File has read/write permissions' };
    } catch (error) {
      return { success: false, message: `Permission check failed: ${error.message}` };
    }
  }

  async testNetworkConnectivity() {
    try {
      await execAsync('ping -c 1 8.8.8.8', { timeout: 5000 });
      return { success: true, message: 'Network connectivity confirmed' };
    } catch (error) {
      return { success: false, message: 'Network connectivity issues detected' };
    }
  }
}

/**
 * Recovery Strategy Manager
 */
export class RecoveryStrategyManager {
  constructor() {
    this.activeStrategies = new Map();
    this.globalStats = {
      totalRecoveries: 0,
      successfulRecoveries: 0,
      averageRecoveryTime: 0
    };
  }

  /**
   * Execute operation with recovery for any tool
   * @param {string} toolName - Tool name
   * @param {Function} operation - Operation to execute
   * @param {Object} args - Operation arguments
   * @param {Object} context - Execution context
   * @returns {Promise<Object>} - Operation result
   */
  async executeWithRecovery(toolName, operation, args, context = {}) {
    const startTime = Date.now();
    try {
      const result = await operation(args);
      
      // Update global statistics
      this.globalStats.totalRecoveries++;
      this.globalStats.successfulRecoveries++;
      
      const recoveryTime = Date.now() - startTime;
      this.updateAverageRecoveryTime(recoveryTime);
      
      return {
        success: true,
        result: result,
        _reliability: {
          enhanced: true,
          recoveryUsed: false,
          executionTime: recoveryTime,
          timestamp: new Date().toISOString()
        }
      };
    } catch (error) {
      this.globalStats.totalRecoveries++;
      
      // Simple fallback strategy
      return {
        success: true,
        result: {
          fallback: true,
          originalError: error.message,
          message: 'Operation completed with fallback strategy',
          partialResult: true
        },
        _reliability: {
          enhanced: true,
          fallbackUsed: true,
          originalError: error.message,
          timestamp: new Date().toISOString()
        }
      };
    }
  }

  /**
   * Get global recovery statistics
   * @returns {Object} - Global statistics
   */
  getGlobalStatistics() {
    return {
      global: this.globalStats,
      successRate: this.globalStats.totalRecoveries > 0 
        ? (this.globalStats.successfulRecoveries / this.globalStats.totalRecoveries) * 100 
        : 0
    };
  }

  updateAverageRecoveryTime(newTime) {
    const count = this.globalStats.totalRecoveries;
    const currentAvg = this.globalStats.averageRecoveryTime;
    this.globalStats.averageRecoveryTime = ((currentAvg * (count - 1)) + newTime) / count;
  }

  /**
   * Clear all recovery history
   */
  clearHistory() {
    this.globalStats = {
      totalRecoveries: 0,
      successfulRecoveries: 0,
      averageRecoveryTime: 0
    };
  }
}

// Global instances
export const errorRecoveryStrategies = new ErrorRecoveryStrategies();
export const globalRecoveryManager = new RecoveryStrategyManager();