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8a37e0a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | from abc import ABC, abstractmethod
from typing import Callable, Generic, TypeVar
T = TypeVar("T")
class ObjectSerializerBase(ABC, Generic[T]):
"""Saves and loads arbitrary python objects."""
def __init__(self) -> None:
self._on_deleted_callbacks: list[Callable[[str], None]] = []
@abstractmethod
def load(self, name: str) -> T:
"""
Loads the object.
:param name: The name of the object to load.
:raises ObjectNotFoundError: if the object is not found
"""
pass
@abstractmethod
def save(self, obj: T) -> str:
"""
Saves the object, returning its name.
:param obj: The object to save.
"""
pass
@abstractmethod
def delete(self, name: str) -> None:
"""
Deletes the object, if it exists.
:param name: The name of the object to delete.
"""
pass
def on_deleted(self, on_deleted: Callable[[str], None]) -> None:
"""Register a callback for when an object is deleted"""
self._on_deleted_callbacks.append(on_deleted)
def _on_deleted(self, name: str) -> None:
for callback in self._on_deleted_callbacks:
callback(name)
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