com.gigaspaces.internal.server.space.eviction

Class ConcurrentLruSpaceEvictionStrategy

java.lang.Object

com.gigaspaces.server.eviction.SpaceEvictionStrategy

com.gigaspaces.internal.server.space.eviction.ConcurrentLruSpaceEvictionStrategy

public class ConcurrentLruSpaceEvictionStrategy
extends SpaceEvictionStrategy

note- concurrent LRU is not an "accurate" eviction policy in the sense that the number of objects stored can be lower than the limit defined but new objects will be rejected. it is mostly suitable for large LRU sizes & large # of threads

Since:

7.0

Author:

Yechiel Feffer

Constructor Summary

Constructors

Constructor and Description
ConcurrentLruSpaceEvictionStrategy(int touchThreshold, int maxCacheSize)

Method Summary

Modifier and Type	Method and Description
int	evict(int numOfEntries) Called when the space requires entries to be evicted.
void	onInsert(EvictableServerEntry entry) Called when a new entry is written to the space.
void	onLoad(EvictableServerEntry entry) Called when an entry is loaded into the space from an external data source.
void	onRead(EvictableServerEntry entry) Called when an entry is read from the space.
void	onRemove(EvictableServerEntry entry) Called when an entry is removed from the space.
void	onUpdate(EvictableServerEntry entry) Called when an entry is updated in the space.
boolean	requiresConcurrencyProtection() Determines whether this eviction strategy implementation requires concurrency protection from the space.

Methods inherited from class com.gigaspaces.server.eviction.SpaceEvictionStrategy

close, getEvictionConfig, getEvictionManager, initialize, isClosed

Methods inherited from class java.lang.Object

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

Constructor Detail

ConcurrentLruSpaceEvictionStrategy

public ConcurrentLruSpaceEvictionStrategy(int touchThreshold,
                                          int maxCacheSize)

Method Detail

requiresConcurrencyProtection

public boolean requiresConcurrencyProtection()

Determines whether this eviction strategy implementation requires concurrency protection from the space.

Overrides:

requiresConcurrencyProtection in class SpaceEvictionStrategy

onInsert

public void onInsert(EvictableServerEntry entry)

Description copied from class: SpaceEvictionStrategy

Called when a new entry is written to the space.

Overrides:

onInsert in class SpaceEvictionStrategy

Parameters:

entry - The new entry

onLoad

public void onLoad(EvictableServerEntry entry)

Description copied from class: SpaceEvictionStrategy

Called when an entry is loaded into the space from an external data source.

Overrides:

onLoad in class SpaceEvictionStrategy

Parameters:

entry - The loaded entry

onRead

public void onRead(EvictableServerEntry entry)

Description copied from class: SpaceEvictionStrategy

Called when an entry is read from the space.

Overrides:

onRead in class SpaceEvictionStrategy

Parameters:

entry - The read entry

onUpdate

public void onUpdate(EvictableServerEntry entry)

Description copied from class: SpaceEvictionStrategy

Called when an entry is updated in the space.

Overrides:

onUpdate in class SpaceEvictionStrategy

Parameters:

entry - The updated entry

onRemove

public void onRemove(EvictableServerEntry entry)

Description copied from class: SpaceEvictionStrategy

Called when an entry is removed from the space.

Overrides:

onRemove in class SpaceEvictionStrategy

Parameters:

entry - The removed entry

evict

public int evict(int numOfEntries)

Description copied from class: SpaceEvictionStrategy

Called when the space requires entries to be evicted.

Specified by:

evict in class SpaceEvictionStrategy

Parameters:

numOfEntries - Number of entries to be evicted

Returns:

The number of entries actually evicted