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44 lines
1023 B
Python
44 lines
1023 B
Python
import abc
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import threading
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from collections import UserList
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class Freezable(metaclass=abc.ABCMeta):
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def __init__(self):
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self._frozen = False
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@property
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def frozen(self) -> bool:
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return self._frozen
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def freeze(self):
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self._frozen = True
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class Signal(UserList, threading.Event):
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def __init__(self, owner: Freezable):
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UserList.__init__(self)
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threading.Event.__init__(self)
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self._owner = owner
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self.frozen = False
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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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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 self.frozen:
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raise RuntimeError("Cannot send on frozen signal.")
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for receiver in self:
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receiver(*args, **kwargs)
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self.frozen = True
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self._owner.freeze()
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self.set()
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