41 lines
1.7 KiB
Python
41 lines
1.7 KiB
Python
from module_business.domain.enums import PalletFlowState
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class InvalidPalletTransition(ValueError):
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"""托盘状态迁移不符合业务规则。"""
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class PalletStateMachine:
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_ALLOWED_TRANSITIONS = frozenset(
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{
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(PalletFlowState.UNSTOCKED, PalletFlowState.EMPTY_IN_WAREHOUSE),
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(
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PalletFlowState.EMPTY_IN_WAREHOUSE,
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PalletFlowState.FILLED_IN_WAREHOUSE,
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),
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(PalletFlowState.FILLED_IN_WAREHOUSE, PalletFlowState.IN_TRANSIT),
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(PalletFlowState.IN_TRANSIT, PalletFlowState.AT_SITE_UNUSED),
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(PalletFlowState.AT_SITE_UNUSED, PalletFlowState.AT_SITE_PARTIAL),
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(PalletFlowState.AT_SITE_UNUSED, PalletFlowState.AT_SITE_EMPTY),
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(PalletFlowState.AT_SITE_UNUSED, PalletFlowState.RETURNING),
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(PalletFlowState.AT_SITE_PARTIAL, PalletFlowState.AT_SITE_PARTIAL),
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(PalletFlowState.AT_SITE_PARTIAL, PalletFlowState.AT_SITE_EMPTY),
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(PalletFlowState.AT_SITE_PARTIAL, PalletFlowState.RETURNING),
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(PalletFlowState.AT_SITE_EMPTY, PalletFlowState.RETURNING),
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(PalletFlowState.RETURNING, PalletFlowState.FILLED_IN_WAREHOUSE),
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(PalletFlowState.RETURNING, PalletFlowState.EMPTY_IN_WAREHOUSE),
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}
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)
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@classmethod
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def ensure_transition(
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cls,
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current: PalletFlowState,
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target: PalletFlowState,
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) -> None:
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if not isinstance(current, PalletFlowState) or not isinstance(target, PalletFlowState):
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raise TypeError('current 和 target 必须是 PalletFlowState')
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if (current, target) not in cls._ALLOWED_TRANSITIONS:
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raise InvalidPalletTransition(f'不允许的托盘状态迁移：{current.value} -> {target.value}')
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