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Caching & Redis

Cache-aside, TTL, invalidation, hot keys, and in-memory lookup patterns at scale.

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Caching & Redis medium

Cache Penetration Null Object Mock in Python

Implement a cache that stores a null marker on misses to prevent repeated database hits, reducing cache penetration.

caching null-object ttl
Python 
import time
from collections import defaultdict
from typing import Any, Optional


class Cache:
    def __init__(self):
        self.store: dict[str, Any] = {}
        self.ttl: dict[str, float] = {}
        self.null_marker = object()

    def get(self, key: str, ttl: int = 60, fallback:
            Any = None) -> An…
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