Package org.apache.jena.atlas.lib

Interface Cache<Key,Value>

All Known Implementing Classes:
Cache0, Cache1, CacheGuava, CacheSimple, CacheWrapper
public interface Cache<Key,Value>
A cache

  • Method Details

    • containsKey

      boolean containsKey(Key key)
      Does the cache contain the key?

    • getIfPresent

      Value getIfPresent(Key key)
      Get from cache - or return null.

    • getOrFill

      Value getOrFill(Key key, Callable<Value> callable)
      Get from cache, of not present, call the Callable to try to fill the cache. This operation should be atomic.

    • put

      void put(Key key, Value thing)
      Insert into the cache

    • remove

      void remove(Key key)
      Remove from cache - return true if key referenced an entry

    • keys

      Iterator<Key> keys()
      Iterate over all keys. Iterating over the keys requires the caller be thread-safe.

    • isEmpty

      boolean isEmpty()

    • clear

      void clear()

    • size

      long size()
      Current size of cache

    • setDropHandler

      void setDropHandler(BiConsumer<Key,Value> dropHandler)
      Register a callback - called when an object is dropped from the cache (optional operation)