Roadmap

Development notes for pending tasks.

Version 2.0

• RemovalListener
  • Use friendlier typed lambda syntax to chain as (k, v, cause) -> ...
    • Delete RemovalNotification from public API
• AsyncLocalCache
  • Add asMap() view
• Tracing
  • Remove deprecated methods
  • Use snake case for system properties (consistency with Typesafe Config library)

Code Review / Pending

• Expired entries (eligible but not evicted)
  • Do all map methods screen and behave as if no entry exists?
  • Are the statistics recorded as a miss?
• Reference collected values (eligible but not evicted)
  • Do all map methods screen and behave as if no entry exists?
  • Are the statistics recorded as a miss?
• Removal listener notification
  • Is the listener notified after the operation completes?
  • Is the listener sent the correct notification?
• 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
• Ticker should only be read from when needed
  • The ticker is enabled if either statistics, expiration, or refresh are enabled
  • This results in the current time being read for no-op calls, e.g. disabled expiration
  • On some operating systems this can significantly degrade performance due to contention

Future

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