org.eclipse.rdf4j.sail.nativerdf

Class ConcurrentCache<K,V>

java.lang.Object

org.eclipse.rdf4j.sail.nativerdf.ConcurrentCache<K,V>

public class ConcurrentCache<K,V>
extends Object

Limited-size concurrent cache. The actual cleanup to keep the size limited is done once per CLEANUP_INTERVAL invocations of the protected method cleanUp. cleanUp method is called every time by put The maximum size is maintained approximately. Cleanup is not done if size is less than capacity + CLEANUP_INTERVAL / 2.

Author:

Oleg Mirzov

Field Summary

Fields

Modifier and Type	Field and Description
protected ConcurrentHashMap<K,V>	cache

Constructor Summary

Constructors

Constructor and Description
ConcurrentCache(int capacity)

Method Summary

Modifier and Type	Method and Description
protected void	cleanUp()
void	clear()
V	get(Object key)
protected boolean	onEntryRemoval(K key)
V	put(K key, V value)

Methods inherited from class java.lang.Object

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

Field Detail

cache

protected final ConcurrentHashMap<K,V> cache

Constructor Detail

ConcurrentCache

public ConcurrentCache(int capacity)

Method Detail

get

public V get(Object key)

put

public V put(K key,
             V value)

clear

public void clear()

onEntryRemoval

protected boolean onEntryRemoval(K key)

Parameters:

key - the key of the node to test for removal and do finalization on

Returns:

true if removal is approved

cleanUp

protected void cleanUp()