46 lines
901 B
Python
46 lines
901 B
Python
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from typing import List
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from cacheflow.sequence import SequenceGroup
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class Policy:
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def get_priority(
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self,
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now: float,
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seq_group: SequenceGroup,
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) -> float:
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raise NotImplementedError
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def sort_by_priority(
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self,
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now: float,
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seq_groups: List[SequenceGroup],
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) -> List[SequenceGroup]:
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return sorted(
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seq_groups,
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key=lambda seq_group: self.get_priority(now, seq_group),
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reverse=True,
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)
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class FCFS(Policy):
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def get_priority(
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self,
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now: float,
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seq_group: SequenceGroup,
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) -> float:
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return now - seq_group.arrival_time
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class PolicyFactory:
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_POLICY_REGISTRY = {
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'fcfs': FCFS,
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}
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@classmethod
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def get_policy(cls, policy_name: str, **kwargs) -> Policy:
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return cls._POLICY_REGISTRY[policy_name](**kwargs)
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