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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

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

protected

CompactSerializationCache.HybridEvictionPolicy()

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.
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

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

CompactSerializationCache.HybridEvictionPolicy

protected CompactSerializationCache.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

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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