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63 lines
1.7 KiB
Python
63 lines
1.7 KiB
Python
"""
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虚拟显示适配器及旧 DisplayHelper 兼容入口。
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"""
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from __future__ import annotations
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from importlib import import_module
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from typing import Any
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from app.foundation.singleton import Singleton
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from app.runtime.log import logger
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from app.runtime.resources import (
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acquire_managed_resource,
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stop_managed_resource,
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)
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DISPLAY_CAPABILITY_ID = "host.display"
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class DisplayHelper(metaclass=Singleton):
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"""
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保留旧构造 API，并把资源所有权委托给 host.display 能力。
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"""
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def __init__(self) -> None:
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"""
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显式构造旧门面时激活虚拟显示，失败保持旧 API 的日志语义。
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"""
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try:
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acquire_managed_resource(
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DISPLAY_CAPABILITY_ID,
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reason="legacy_display_helper",
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retry=True,
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)
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except Exception as error:
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logger.error("DisplayHelper init error: %s", error)
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def stop(self) -> None:
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"""
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停止已激活的虚拟显示；未配置 Runtime 时保持幂等。
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"""
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stop_managed_resource(
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DISPLAY_CAPABILITY_ID,
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reason="legacy_display_helper_stop",
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)
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__all__ = ["DISPLAY_CAPABILITY_ID", "DisplayHelper", "VirtualDisplayResource"]
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def __getattr__(name: str) -> Any:
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"""
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按需公开资源实现，普通兼容导入不加载显示后端。
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"""
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if name != "VirtualDisplayResource":
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raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
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value = getattr(
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import_module("app.adapters.system.display.resource"),
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"VirtualDisplayResource",
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)
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globals()[name] = value
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return value
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