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35 lines
948 B
Python
35 lines
948 B
Python
5 years ago
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from aiohttp.frozenlist import FrozenList
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__all__ = ('Signal',)
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class Signal(FrozenList):
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"""Coroutine-based signal implementation.
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To connect a callback to a signal, use any list method.
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Signals are fired using the send() coroutine, which takes named
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arguments.
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"""
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__slots__ = ('_owner',)
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def __init__(self, owner):
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super().__init__()
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self._owner = owner
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def __repr__(self):
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return '<Signal owner={}, frozen={}, {!r}>'.format(self._owner,
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self.frozen,
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list(self))
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async def send(self, *args, **kwargs):
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"""
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Sends data to all registered receivers.
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"""
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if not self.frozen:
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raise RuntimeError("Cannot send non-frozen signal.")
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for receiver in self:
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await receiver(*args, **kwargs) # type: ignore
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