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# diagnosis/ai_engine/model_loader.py
"""Singleton pattern for model loading
This loader provides a clean interface for getting the detector instance.
Uses singleton pattern to ensure models are loaded only once.
"""
import logging
logger = logging.getLogger(__name__)
_detector_instance = None
def get_stutter_detector():
"""
Get or create singleton AdvancedStutterDetector instance.
This ensures models are loaded only once and reused across requests.
Returns:
AdvancedStutterDetector: The singleton detector instance
Raises:
ImportError: If the detector class cannot be imported
"""
global _detector_instance
if _detector_instance is None:
try:
from .detect_stuttering import AdvancedStutterDetector
logger.info("🔄 Initializing detector instance (first call)...")
_detector_instance = AdvancedStutterDetector()
logger.info("✅ Detector instance created successfully")
except ImportError as e:
logger.error(f"❌ Failed to import AdvancedStutterDetector: {e}")
raise ImportError("No StutterDetector implementation available in detect_stuttering.py") from e
except Exception as e:
logger.error(f"❌ Failed to create detector instance: {e}")
raise
return _detector_instance
def reset_detector():
"""
Reset the singleton instance (useful for testing or reloading models).
Note: This will force reloading of models on next get_stutter_detector() call.
"""
global _detector_instance
_detector_instance = None
logger.info("🔄 Detector instance reset")
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