mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-10 09:17:48 +01:00
34 lines
852 B
Python
34 lines
852 B
Python
from aiohttp.frozenlist import FrozenList
|
|
|
|
__all__ = ("Signal",)
|
|
|
|
|
|
class Signal(FrozenList):
|
|
"""Coroutine-based signal implementation.
|
|
|
|
To connect a callback to a signal, use any list method.
|
|
|
|
Signals are fired using the send() coroutine, which takes named
|
|
arguments.
|
|
"""
|
|
|
|
__slots__ = ("_owner",)
|
|
|
|
def __init__(self, owner):
|
|
super().__init__()
|
|
self._owner = owner
|
|
|
|
def __repr__(self):
|
|
return "<Signal owner={}, frozen={}, {!r}>".format(
|
|
self._owner, self.frozen, list(self)
|
|
)
|
|
|
|
async def send(self, *args, **kwargs):
|
|
"""
|
|
Sends data to all registered receivers.
|
|
"""
|
|
if not self.frozen:
|
|
raise RuntimeError("Cannot send non-frozen signal.")
|
|
|
|
for receiver in self:
|
|
await receiver(*args, **kwargs) # type: ignore
|