Class CompactSerializationCache.LFUEvictionPolicy

java.lang.Object

com.tangosol.net.cache.CompactSerializationCache.InternalEvictionPolicy

com.tangosol.net.cache.CompactSerializationCache.LFUEvictionPolicy

All Implemented Interfaces:

ConfigurableCacheMap.EvictionPolicy

Enclosing class:

CompactSerializationCache

protected class CompactSerializationCache.LFUEvictionPolicy
extends CompactSerializationCache.InternalEvictionPolicy

An EvictionPolicy implementing the Least Frequently Used (LFU) algorithm.

Since:

Coherence 12.1.2

Author:

rhl 2013.01.23

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 final CompactSerializationCache.TouchCountVisitor	f_visitor	The singleton TouchCountVisitor (eviction is single-threaded).

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

f_visitorTouchCount, f_visitorTouchTime, m_ldtLastEvict

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	LFUEvictionPolicy()

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.

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

entryTouched, entryTouched, getName, requestEviction, touchInternal

Methods inherited from class java.lang.Object

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

Field Details

f_visitor

protected final CompactSerializationCache.TouchCountVisitor f_visitor

The singleton TouchCountVisitor (eviction is single-threaded).

Constructor Details

LFUEvictionPolicy

protected LFUEvictionPolicy()

Method Details

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