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from frozenlist import FrozenList |
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__version__ = "1.3.1" |
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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( |
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self._owner, self.frozen, list(self) |
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) |
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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) |
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