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com.tangosol.net.cache
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.

Nested Class Summary

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

CompactSerializationCache.InternalEvictionPolicy.EvictionCandidate, CompactSerializationCache.InternalEvictionPolicy.EvictionVisitor

Field Summary

protected 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

protected

CompactSerializationCache.LFUEvictionPolicy()

Method Summary

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

Field Detail

f_visitor

protected final CompactSerializationCache.TouchCountVisitor f_visitor

The singleton TouchCountVisitor (eviction is single-threaded).

Constructor Detail

CompactSerializationCache.LFUEvictionPolicy

protected CompactSerializationCache.LFUEvictionPolicy()

Method Detail

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

getConfiguredPolicy

protected ConfigurableCacheMap.EvictionPolicy getConfiguredPolicy()

Return the configured EvictionPolicy instance.

Specified by:

getConfiguredPolicy in class CompactSerializationCache.InternalEvictionPolicy

Returns:

the configured EvictionPolicy

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