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130 lines
3.7 KiB
Python
130 lines
3.7 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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# Copyright (c) 2025 Allaun
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# pylint: disable=broad-exception-caught
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"""Dependency injection container with hard isolation.
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This module provides a minimal dependency injection container that
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maintains complete isolation from optional dependencies.
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Key Features:
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- Service registration and retrieval
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- Lazy initialization
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- Graceful degradation
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- Error handling with resilience
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Dependencies:
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- Standard library only
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"""
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from typing import Dict, Any, Optional, Callable
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class ServiceContainer:
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"""Minimal dependency injection container.
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Responsibilities:
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- Service registration and management
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- Lazy initialization
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- Graceful degradation
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"""
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def __init__(self) -> None:
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"""Initialize service container."""
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self.services: Dict[str, Any] = {}
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self.factories: Dict[str, Callable[[], Any]] = {}
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def register_service(self, name: str, service: Any) -> None:
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"""Register a service instance.
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Args:
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name: Service name
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service: Service instance
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"""
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self.services[name] = service
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def register_factory(self, name: str, factory: Callable[[], Any]) -> None:
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"""Register a service factory for lazy initialization.
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Args:
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name: Service name
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factory: Factory function that creates the service
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"""
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self.factories[name] = factory
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def get_service(self, name: str) -> Optional[Any]:
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"""Get a service by name, with lazy initialization if needed.
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Args:
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name: The name of the service to retrieve
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Returns:
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The service instance if found, None otherwise
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"""
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if name in self.services:
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return self.services[name]
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if name in self.factories:
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try:
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service = self.factories[name]()
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self.services[name] = service
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return service
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except Exception as e:
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print(f"[WARN] Failed to initialize service {name}: {e}")
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return None
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return None
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def check_compliance(self) -> Dict[str, Any]:
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"""ISO/IEC 25010:2011 Compliance Health Check.
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Verifies Functional Suitability and Reliability of all registered services.
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"""
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report = {
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"status": "OPERATIONAL",
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"services": {},
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"metrics": {
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"total_services": len(self.services) + len(self.factories),
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"active_services": len(self.services)
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}
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}
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for name in list(self.services.keys()) + list(self.factories.keys()):
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report["services"][name] = {
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"is_active": name in self.services,
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"is_lazy": name in self.factories,
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"reliability": "VERIFIED" if name in self.services else "PENDING"
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}
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return report
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def has_service(self, name: str) -> bool:
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"""Check if a service is available.
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Args:
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name: Service name
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Returns:
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True if service is available, False otherwise
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"""
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return name in self.services or name in self.factories
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def remove_service(self, name: str) -> None:
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"""Remove a service from the container.
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Args:
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name: Service name
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"""
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if name in self.services:
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del self.services[name]
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if name in self.factories:
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del self.factories[name]
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def clear(self) -> None:
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"""Clear all services and factories."""
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self.services.clear()
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self.factories.clear()
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# Global service container instance
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container = ServiceContainer()
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