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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

Refresh Proactive TTL Renewal in Python

This snippet implements a proactive TTL renewal pattern that refreshes a cache expiration before it lapses, using a mock counter to track renewals.

caching ttl renewal
Python 
import time
from datetime import datetime, timezone

class TTLRenewer:
    def __init__(self, ttl_seconds=10, renew_at=0.5):
        self.ttl = ttl_seconds
        self.last_renewed = time.time()
        self.renew_threshold = ttl_seconds * renew_at
        self.renewals = 0

    def check_and_renew(self):
        if …
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