org.apache.jena.atlas.lib

Interface Cache<Key,Value>

All Known Subinterfaces:

CacheStats<K,V>

All Known Implementing Classes:

Cache0, Cache1, CacheLRU, CacheSimple, CacheStatsAtomic, CacheStatsSimple, CacheSync, CacheUnbounded, CacheWithGetter, CacheWrapper

public interface Cache<Key,Value>

A cache

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(Key key) Does the cache contain the key?
Value	get(Key key) Get from cache - or return null.
boolean	isEmpty()
Iterator<Key>	keys() Iterate over all keys.
Value	put(Key key, Value thing) Insert into from cache and return old value (or null if none)
boolean	remove(Key key) Remove from cache - return true if key referenced an entry
void	setDropHandler(ActionKeyValue<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?

get

Value get(Key key)

Get from cache - or return null. Implementations should state whether they are thread-safe or not.

put

Value put(Key key,
        Value thing)

Insert into from cache and return old value (or null if none)

remove

boolean remove(Key key)

Remove from cache - return true if key referenced an entry

keys

Iterator<Key> keys()

Iterate over all keys. Iteratering 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(ActionKeyValue<Key,Value> dropHandler)

Register a callback - called when an object is dropped from the cache (optional operation)