Package com.gigaspaces.internal.server.space.eviction

Class AllInCacheSpaceEvictionStrategy

java.lang.Object

com.gigaspaces.server.eviction.SpaceEvictionStrategy

com.gigaspaces.internal.server.space.eviction.AllInCacheSpaceEvictionStrategy

public class AllInCacheSpaceEvictionStrategy
extends SpaceEvictionStrategy

Since:

5.0

Author:

Yechiel Feffer

Constructor Summary

Constructors

Constructor	Description
AllInCacheSpaceEvictionStrategy()

Method Summary

Modifier and Type	Method	Description
int	evict(int numOfEntries)	Called when the space requires entries to be evicted.
boolean	requiresConcurrencyProtection()	Due to the nature of the system, calls to SpaceEvictionStrategy.onRemove(EvictableServerEntry) can occur in concurrent with either SpaceEvictionStrategy.onRead(EvictableServerEntry) or SpaceEvictionStrategy.onUpdate(EvictableServerEntry) or even before them.

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

close, getEvictionConfig, getEvictionManager, initialize, isClosed, onInsert, onLoad, onRead, onRemove, onUpdate

Methods inherited from class java.lang.Object

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

Constructor Details

AllInCacheSpaceEvictionStrategy

public AllInCacheSpaceEvictionStrategy()

Method Details

requiresConcurrencyProtection

public boolean requiresConcurrencyProtection()

Description copied from class: SpaceEvictionStrategy

Due to the nature of the system, calls to SpaceEvictionStrategy.onRemove(EvictableServerEntry) can occur in concurrent with either SpaceEvictionStrategy.onRead(EvictableServerEntry) or SpaceEvictionStrategy.onUpdate(EvictableServerEntry) or even before them. In order to prevent this behavior this property should return true (This is the default) and the system will guard this with locks. This should only be set to false by advanced usages which needs to be able to work under this behavior.

Overrides:

requiresConcurrencyProtection in class SpaceEvictionStrategy

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