ddd4j Cache

Overview

Choose single-node or distributed consistency semantics first, then choose the implementation. All implementations are consumed by upper layers through the core Cache/CacheManager/CasCache/AtomicCache contracts.

When to Use

• Choosing between Caffeine/Guava/Hutool (single-JVM), Lettuce/Jedis (native Redis), Redisson (distributed locks/objects), JetCache (multilevel), or Memcached.
• Implementing cluster-safe idempotency on the AtomicCache / CasCache / GetsResponse contracts.
• Configuring and testing TTL semantics — units, zero/negative values, and precision per implementation.
• Designing cache keys with tenant isolation and without PII.
• Reviewing lock ownership, timeouts, and release-on-exception behavior.
• Deciding what happens when Redis is unavailable — degradation vs silent success.

When NOT to Use

Do not use this skill when: