98 lines
2.5 KiB
Python
98 lines
2.5 KiB
Python
# Copyright (c) 2025 Patrick Motsch
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# All rights reserved.
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"""
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Service Center Resolver.
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Resolution logic and dependency injection for service instantiation.
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"""
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import importlib
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import logging
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from typing import Any, Callable, Dict, Optional, Set
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from modules.serviceCenter.context import ServiceCenterContext
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from modules.serviceCenter.registry import CORE_SERVICES, IMPORTABLE_SERVICES
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logger = logging.getLogger(__name__)
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GetServiceFunc = Callable[[str], Any]
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def _make_context_id(ctx: ServiceCenterContext) -> str:
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"""Create a stable cache key from context."""
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return f"{id(ctx.user)}_{ctx.mandateId or ''}_{ctx.featureInstanceId or ''}"
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def _load_service_class(module_path: str, class_name: str):
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"""Load service class from module."""
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module = importlib.import_module(module_path)
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return getattr(module, class_name)
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def resolve(
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key: str,
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context: ServiceCenterContext,
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cache: Dict[str, Any],
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resolving: Set[str],
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) -> Any:
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"""
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Resolve a service by key. Uses cache, resolves dependencies recursively.
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Raises KeyError if the service is not registered.
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"""
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cache_key = f"{_make_context_id(context)}_{key}"
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if cache_key in cache:
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return cache[cache_key]
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if key in resolving:
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raise RuntimeError(f"Circular dependency detected for service: {key}")
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def get_service(dep_key: str) -> Any:
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return resolve(dep_key, context, cache, resolving)
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spec = CORE_SERVICES.get(key) or IMPORTABLE_SERVICES.get(key)
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if spec:
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cls = _load_service_class(spec["module"], spec["class"])
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resolving.add(key)
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try:
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for dep in spec.get("dependencies", []):
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get_service(dep)
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finally:
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resolving.discard(key)
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instance = cls(context, get_service)
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cache[cache_key] = instance
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return instance
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raise KeyError(f"Unknown service: {key}")
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# Module-level cache for service instances (per context)
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_resolution_cache: Dict[str, Any] = {}
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_cache_lock: Optional[Any] = None
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try:
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from threading import Lock
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_cache_lock = Lock()
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except ImportError:
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pass
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def getResolutionCache() -> Dict[str, Any]:
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"""Get the module-level resolution cache (for preWarm/clear)."""
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return _resolution_cache
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def clearCache() -> None:
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"""Clear the resolution cache."""
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lock = _cache_lock if _cache_lock is not None else _DummyLock()
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with lock:
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_resolution_cache.clear()
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class _DummyLock:
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def __enter__(self):
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return self
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def __exit__(self, *args):
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pass
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