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- Implement BaseComponent with async lifecycle and context management - Add ApplicationContext for managing component initialization and registry - Create Application class for orchestrating job execution and lifecycle - Add AS LLM components with OpenAI chat model wrapper - Implement AS LLM formatter components with OpenAI formatter - Add client implementations including base, HTTP and ReMe clients - Create embedding model base class with caching and batching support - Implement file store base class with vector and full-text search - Add file watcher components for monitoring file system changes - Create job components for executing workflows - Implement service components for exposing jobs via different protocols - Add configuration schema with ApplicationConfig and ComponentConfig - Include utility modules for case conversion, chunking, logging and similarity - Register component types and create component registry system
43 lines
1.2 KiB
Python
43 lines
1.2 KiB
Python
"""Singleton pattern implementation using a class decorator.
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Provides a thread-safe singleton decorator that ensures only one instance
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of a decorated class exists throughout the application lifecycle.
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"""
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import threading
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from typing import Any, Callable, TypeVar
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T = TypeVar("T")
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def singleton(cls: type[T]) -> Callable[..., T]:
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"""A class decorator that ensures only one instance of a class exists.
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Thread-safe implementation using a lock to prevent race conditions
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during instance creation.
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Args:
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cls: The class to decorate with singleton behavior.
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Returns:
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A wrapper function that returns the single instance.
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"""
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_instance: dict[type[T], T] = {}
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_lock = threading.Lock()
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def _singleton(*args: Any, **kwargs: Any) -> T:
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"""Return the existing instance or create a new one if it doesn't exist.
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Args:
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*args: Positional arguments passed to the class constructor.
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**kwargs: Keyword arguments passed to the class constructor.
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Returns:
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The single instance of the decorated class.
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"""
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with _lock:
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if cls not in _instance:
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_instance[cls] = cls(*args, **kwargs)
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return _instance[cls]
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return _singleton
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