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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