34 lines
948 B
Python
34 lines
948 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
|