Package org.xwiki.cache.eviction

Class LRUEvictionConfiguration

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<String,Object>

org.xwiki.cache.eviction.EntryEvictionConfiguration

org.xwiki.cache.eviction.LRUEvictionConfiguration

All Implemented Interfaces:

Serializable, Cloneable, Map<String,Object>

public class LRUEvictionConfiguration
extends EntryEvictionConfiguration

An helper for EntryEvictionConfiguration.Algorithm.NONE cache algorithm. Evicts the least recently used entry when thresholds are hit.

Version:

$Id: ffcbd72a3533764cefa62654dbe8eb3fbe470af5 $

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.xwiki.cache.eviction.EntryEvictionConfiguration

EntryEvictionConfiguration.Algorithm

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Field Summary

Fields

Modifier and Type	Field	Description
static String	LIFESPAN_ID
static String	MAXENTRIES_ID	The key to access the maximum entries the cache can contain.

Fields inherited from class org.xwiki.cache.eviction.EntryEvictionConfiguration

CONFIGURATIONID, TIMETOLIVE_ID

Constructor Summary

Constructors

Constructor	Description
LRUEvictionConfiguration()	Create a new EntryEvictionConfiguration based on LRU algorithm.
LRUEvictionConfiguration(int maxEntries)	Create a new EntryEvictionConfiguration with given capacity, eviction will be based on LRU algorithm.

Method Summary

Modifier and Type	Method	Description
int	getLifespan()
int	getMaxEntries()
int	getMaxIdle()
void	setLifespan(int lifespan)
void	setMaxEntries(int maxEntries)
void	setMaxIdle(int maxIdle)

Methods inherited from class org.xwiki.cache.eviction.EntryEvictionConfiguration

getAlgorithm, getTimeToLive, setAlgorithm, setTimeToLive

Methods inherited from class java.util.HashMap

clear, clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, get, getOrDefault, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Field Detail

MAXENTRIES_ID

public static final String MAXENTRIES_ID

The key to access the maximum entries the cache can contain.

See Also:

Constant Field Values

LIFESPAN_ID

public static final String LIFESPAN_ID

See Also:

getLifespan(), Constant Field Values

Constructor Detail

LRUEvictionConfiguration

public LRUEvictionConfiguration()

Create a new EntryEvictionConfiguration based on LRU algorithm.

LRUEvictionConfiguration

public LRUEvictionConfiguration(int maxEntries)

Create a new EntryEvictionConfiguration with given capacity, eviction will be based on LRU algorithm.

Parameters:

maxEntries - the maximum entries the cache can contain.

Since:

4.3M1

Method Detail

setMaxEntries

public void setMaxEntries(int maxEntries)

Parameters:

maxEntries - see getMaxEntries()

getMaxEntries

public int getMaxEntries()

Returns:

the maximum entries the cache can contain. When the cache reaches that any element, the defined eviction algorithm kicks in to remove existing cache entries.

setMaxIdle

public void setMaxIdle(int maxIdle)

Parameters:

maxIdle - see getMaxIdle()

Since:

7.4M2

getMaxIdle

public int getMaxIdle()

Returns:

the time a cache entry will continue to stay in the cache after being last accessed, in seconds. When the time is reached, the entry is expired and removed from the cache. In addition, when the cache reaches its maximum number of entries, the defined eviction algorithm is used (e.g. LRU) and thus an entry can stay less time in the cache than its maximum defined time.

Since:

7.4M2

setLifespan

public void setLifespan(int lifespan)

Parameters:

lifespan - see getLifespan()

Since:

7.4M2

getLifespan

public int getLifespan()

Returns:

the maximum lifespan of a cache entry, after which the entry is expired and removed from the cache, in seconds. In addition, when the cache reaches its maximum number of entries, the defined eviction algorithm is used (e.g. LRU) and thus an entry can stay less time in the cache than its maximum defined time.

Since:

7.4M2