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from frozenlist import FrozenList

__version__ = "1.3.1"

__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