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 Summary

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(Key key) Does the cache contain the key?
Value	getIfPresent(Key key) Get from cache - or return null.
Value	getOrFill(Key key, Callable<Value> callable) Get from cache, of not present, call the Callable to try to fill the cache.
boolean	isEmpty()
Iterator<Key>	keys() Iterate over all keys.
void	put(Key key, Value thing) Insert into the cache
void	remove(Key key) Remove from cache - return true if key referenced an entry
void	setDropHandler(BiConsumer<Key,Value> dropHandler) Register a callback - called when an object is dropped from the cache (optional operation)
long	size() Current size of cache

Method Detail

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)