Feb 24, 2025 · Backend Development

Understanding Caffeine Cache Expiration: TimeWheel Mechanism and Custom Expiration Strategies

This article explains how Caffeine implements element expiration using three built‑in policies and a custom TimeWheel strategy, detailing the construction of the timer wheel, bucket selection, scheduling, advancing, and eviction logic within the cache's maintenance cycle.

BackendCacheCaffeine

0 likes · 15 min read

Understanding Caffeine Cache Expiration: TimeWheel Mechanism and Custom Expiration Strategies

IT Architects Alliance

Apr 5, 2022 · Backend Development

Understanding Java Timers, DelayQueue, ScheduledThreadPoolExecutor, and Time‑Wheel Algorithms

This article explains the concepts, use cases, and internal implementations of Java's Timer, DelayQueue, and ScheduledThreadPoolExecutor, compares their performance characteristics, and introduces the time‑wheel scheduling algorithm—including hierarchical wheels—to address scalability challenges in high‑volume timed‑task systems.

DelayQueueScheduledThreadPoolExecutorScheduling

0 likes · 12 min read

Understanding Java Timers, DelayQueue, ScheduledThreadPoolExecutor, and Time‑Wheel Algorithms