Module org.apache.jena.base

Package org.apache.jena.atlas.lib.cache

Class Cache0<K,V>

java.lang.Object

org.apache.jena.atlas.lib.cache.Cache0<K,V>

All Implemented Interfaces:

Cache<K,V>

public final class Cache0<K,V>
extends Object
implements Cache<K,V>

A cache that keeps nothing

Constructor Summary

Constructors

Constructor	Description
Cache0()

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	containsKey(K key)	Does the cache contain the key?
V	get(K key, Function<K,V> function)	Get from cache; if not present, call the Function to fill the cache slot.
V	getIfPresent(K key)	Get from cache - or return null.
boolean	isEmpty()
Iterator<K>	keys()	Iterate over all keys.
void	put(K key, V thing)	Insert into the cache
void	remove(K key)	Remove from cache - return true if key referenced an entry
long	size()	Current size of cache

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.jena.atlas.lib.Cache

getOrFill, stats

Constructor Details

Cache0

public Cache0()

Method Details

containsKey

public boolean containsKey(K key)

Description copied from interface: Cache

Does the cache contain the key?

Specified by:

containsKey in interface Cache<K,V>

getIfPresent

public V getIfPresent(K key)

Description copied from interface: Cache

Get from cache - or return null.

Specified by:

getIfPresent in interface Cache<K,V>

get

public V get(K key,
 Function<K,V> function)

Description copied from interface: Cache

Get from cache; if not present, call the Function to fill the cache slot. This operation should be atomic.

Specified by:

get in interface Cache<K,V>

put

public void put(K key,
 V thing)

Description copied from interface: Cache

Insert into the cache

Specified by:

put in interface Cache<K,V>

remove

public void remove(K key)

Description copied from interface: Cache

Remove from cache - return true if key referenced an entry

Specified by:

remove in interface Cache<K,V>

keys

public Iterator<K> keys()

Description copied from interface: Cache

Iterate over all keys. Iterating over the keys requires the caller be thread-safe.

Specified by:

keys in interface Cache<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Cache<K,V>

clear

public void clear()

Specified by:

clear in interface Cache<K,V>

size

public long size()

Description copied from interface: Cache

Current size of cache

Specified by:

size in interface Cache<K,V>