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https://github.com/blackboxprogramming/lucidia.git
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44 lines
1.3 KiB
Python
44 lines
1.3 KiB
Python
from __future__ import annotations
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from dataclasses import dataclass
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from typing import Deque, Optional
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from collections import deque
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@dataclass
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class Snapshot:
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"""
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Represents a snapshot of system state with a reason for the snapshot.
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"""
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state: str
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reason: str
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class ContinuityManager:
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"""Maintains snapshots of system state for continuity purposes."""
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def __init__(self, max_history: int = 10) -> None:
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self.history: Deque[Snapshot] = deque(maxlen=max_history)
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def record(self, state: str, reason: str) -> None:
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"""
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Record a new snapshot of the system state with a reason.
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"""
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self.history.append(Snapshot(state, reason))
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def rewind(self, steps: int = 1) -> Optional[Snapshot]:
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"""
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Rewind the history by `steps` snapshots and return the current snapshot.
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If history is empty, return None.
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"""
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if not self.history:
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return None
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for _ in range(min(steps, len(self.history) - 1)):
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self.history.pop()
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return self.history[-1]
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if __name__ == "__main__":
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manager = ContinuityManager(max_history=3)
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manager.record("start", "boot")
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manager.record("middle", "processing")
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manager.record("end", "shutdown")
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print(manager.rewind())
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