from dataclasses import dataclass
from typing import Any, Iterable
from .base import Storage
from ..digest import Digest
from copy import deepcopy
@dataclass(frozen=True)
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class Memory(Storage):
"""
A concrete implementation of Storage that stores values in an in-memory dictionary.
"""
[docs]
storage: dict[Digest, Any]
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def _save(self, value: Any, key: Digest) -> Digest:
self.storage[key] = deepcopy(value)
return key
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def _load(self, key: Digest) -> Any:
return deepcopy(self.storage[key])
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def _contains(self, key: Digest) -> bool:
return key in self.storage
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def list(self) -> Iterable[Digest]:
return tuple(self.storage.keys())
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def _evict(self, key: Digest) -> None:
self.storage.pop(key, None)