jhalterman/expiringmap

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1036 stars · 148 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

ExpiringMap is a high-performance, zero-dependency, thread-safe Java ConcurrentMap implementation whose entries expire automatically. It supports variable per-entry expiration, expiration policies, max-size eviction, expiration listeners, and lazy loading.

Use cases

• cache session data with automatic expiry in java
• store connections in a map that expire after 30 seconds
• evict oldest entries when map reaches max size
• run a callback when a cached entry expires
• give each map entry its own ttl
• replace guava cache with a lightweight expiring map

When to choose

• you need a simple, zero-dependency expiring map on the JVM
• you need per-entry variable TTLs or expiration policies
• you want expiration listeners or lazy entry loading without a full caching framework

When to avoid

• you need advanced caching features like LRU eviction, statistics, or persistence - use Caffeine or Guava Cache
• you need a distributed or multi-process cache
• you are not on the JVM

Facets

library · maturity stable

caching concurrency data-science developer-tools backend performance jvm expiring-map concurrentmap ttl cache zero-dependency thread-safe

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