Package com.tangosol.net.cache

Class CompactSerializationCache.HybridEvictionPolicy

java.lang.Object

com.tangosol.net.cache.CompactSerializationCache.InternalEvictionPolicy

com.tangosol.net.cache.CompactSerializationCache.HybridEvictionPolicy

All Implemented Interfaces:

ConfigurableCacheMap.EvictionPolicy

Enclosing class:

CompactSerializationCache

protected class CompactSerializationCache.HybridEvictionPolicy
extends CompactSerializationCache.InternalEvictionPolicy

The EvictionPolicy object for the Hybrid eviction algorithm.

Nested Class Summary

Nested classes/interfaces inherited from class com.tangosol.net.cache.CompactSerializationCache.InternalEvictionPolicy

CompactSerializationCache.InternalEvictionPolicy.EvictionCandidate, CompactSerializationCache.InternalEvictionPolicy.EvictionVisitor

Field Summary

Fields

Modifier and Type	Field	Description
protected CompactSerializationCache.TouchCountVisitor	f_visitor	The singleton TouchCountVisitor (eviction is single-threaded).
protected int	m_cTouchesAvg	The average number of touches that each entry in the cache has.

Fields inherited from class com.tangosol.net.cache.CompactSerializationCache.InternalEvictionPolicy

f_visitorTouchCount, f_visitorTouchTime, m_ldtLastEvict

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	HybridEvictionPolicy()

Method Summary

Modifier and Type	Method	Description
protected long	calculateWeight(Binary binKey)	Calculate the "weight" of the entry associated with the specified key.
protected ConfigurableCacheMap.EvictionPolicy	getConfiguredPolicy()	Return the configured EvictionPolicy instance.
void	requestEviction(int cMaximum)	This method is called by the cache when the cache requires the eviction policy to evict entries.

Methods inherited from class com.tangosol.net.cache.CompactSerializationCache.InternalEvictionPolicy

entryTouched, entryTouched, getName, touchInternal

Methods inherited from class java.lang.Object

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

Field Detail

m_cTouchesAvg

protected transient int m_cTouchesAvg

The average number of touches that each entry in the cache has. Used during the iteration (evict-set calculation) only.

f_visitor

protected final CompactSerializationCache.TouchCountVisitor f_visitor

The singleton TouchCountVisitor (eviction is single-threaded).

Constructor Detail

HybridEvictionPolicy

protected HybridEvictionPolicy()

Method Detail

requestEviction

public void requestEviction(int cMaximum)

This method is called by the cache when the cache requires the eviction policy to evict entries.

Specified by:

requestEviction in interface ConfigurableCacheMap.EvictionPolicy

Overrides:

requestEviction in class CompactSerializationCache.InternalEvictionPolicy

Parameters:

cMaximum - the maximum number of units that should remain in the cache when the eviction is complete

calculateWeight

protected long calculateWeight(Binary binKey)

Calculate the "weight" of the entry associated with the specified key. The weight is a quantitative measure of how to prioritize the eviction of this entry w.r.t. the other cache entries. Entries with a smaller weights are of higher priority and are preferred over entries with larger weights for eviction.

Specified by:

calculateWeight in class CompactSerializationCache.InternalEvictionPolicy

Parameters:

binKey - the key to calculate the weight for

Returns:

the weight of the entry

getConfiguredPolicy

protected ConfigurableCacheMap.EvictionPolicy getConfiguredPolicy()

Return the configured EvictionPolicy instance.

Specified by:

getConfiguredPolicy in class CompactSerializationCache.InternalEvictionPolicy

Returns:

the configured EvictionPolicy