Roadmap

Version 2.0

A major revision that includes API incompatible changes.

• RemovalListener
  • Use friendlier typed lambda syntax to chain as (k, v, cause) -> ...
  • RemovalNotification retained as helper, but not used in the API
• AsyncLocalCache
  • Consider extending Cache<K, CompletableFuture<V>> interface
    • Cache: Conflict on get(k, k -> v) with get(k, k -> future)
    • LoadingCache: Conflicts on getAll returning future<map> vs map<k, future>
  • Add asMap() view of key -> futures
• Tracing
  • Remove deprecated methods
  • Use snake case for system properties (consistency with Typesafe Config library)
• Rename SerializationAwareCopyStrategy to JavaSerializationCopyStrategy

Pending

• Add CacheWriter
  • Simplifies support for write-through / write-behind caching, e.g. layered caches
  • Executed synchronously within atomic block that writes/deletes the cache entry
• JCache eviction listener ordering
  • Spec says that listeners must be notified in sequence of key operations
  • All implementations use asynchronous (unordered) notifications on eviction
  • Implement race handling to delay a events until the preceding evict is sent
• Reduce excessive padding
  • Currently copy-and-pasted for quick development
  • Uses 128-byte padding to protect from adjacent fields
• Arena spacing vs padding (ConcurrentLinkedStack, SingleConsumerQueue)
  • Benchmark spacing arena elements for better false sharing avoidance.

Future

• Collections
  • MPSC linked array queue [slides]
• Simulator
  • Add weight and expiration support
  • Advanced eviction policies
    • 2Q and OpenBSD's adaption
    • LIRS
    • Clock-Pro
    • TinyLFU