Martin Bauer
d44c24ec97
- event bus systen - all components are independent - preparation for web frontend
27 lines
702 B
Python
27 lines
702 B
Python
"""What a front-end has to look like.
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A service gets the bus, subscribes to state events to push outward, and emits intents
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inward. Nothing else in the app knows which services exist.
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"""
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from __future__ import annotations
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from typing import Protocol, runtime_checkable
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__all__ = ["Publisher", "Service"]
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@runtime_checkable
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class Service(Protocol):
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name: str
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async def run(self) -> None:
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"""Long-running task. Cancelled on shutdown; may reconnect internally."""
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...
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class Publisher(Protocol):
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"""How an entity sends something out, without knowing about the connection."""
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async def publish(self, topic: str, payload: str, *, retain: bool = False) -> None: ...
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