73 lines
1.9 KiB
Python
73 lines
1.9 KiB
Python
from __future__ import annotations
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from collections.abc import Sequence
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from typing import Any, Generic
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from typing_extensions import Self
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from langgraph._internal._typing import MISSING
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from langgraph.channels.base import BaseChannel, Value
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from langgraph.errors import EmptyChannelError
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__all__ = ("AnyValue",)
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class AnyValue(Generic[Value], BaseChannel[Value, Value, Value]):
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"""Stores the last value received, assumes that if multiple values are
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received, they are all equal."""
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__slots__ = ("typ", "value")
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value: Value | Any
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def __init__(self, typ: Any, key: str = "") -> None:
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super().__init__(typ, key)
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self.value = MISSING
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def __eq__(self, value: object) -> bool:
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return isinstance(value, AnyValue)
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@property
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def ValueType(self) -> type[Value]:
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"""The type of the value stored in the channel."""
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return self.typ
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@property
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def UpdateType(self) -> type[Value]:
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"""The type of the update received by the channel."""
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return self.typ
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def copy(self) -> Self:
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"""Return a copy of the channel."""
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empty = self.__class__(self.typ, self.key)
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empty.value = self.value
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return empty
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def from_checkpoint(self, checkpoint: Value) -> Self:
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empty = self.__class__(self.typ, self.key)
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if checkpoint is not MISSING:
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empty.value = checkpoint
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return empty
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def update(self, values: Sequence[Value]) -> bool:
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if len(values) == 0:
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if self.value is MISSING:
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return False
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else:
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self.value = MISSING
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return True
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self.value = values[-1]
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return True
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def get(self) -> Value:
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if self.value is MISSING:
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raise EmptyChannelError()
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return self.value
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def is_available(self) -> bool:
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return self.value is not MISSING
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def checkpoint(self) -> Value:
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return self.value
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