com.tangosol.net.cache

Class CompactSerializationCache.InternalEvictionPolicy

java.lang.Object

com.tangosol.net.cache.CompactSerializationCache.InternalEvictionPolicy

All Implemented Interfaces:

ConfigurableCacheMap.EvictionPolicy

Direct Known Subclasses:

CompactSerializationCache.HybridEvictionPolicy, CompactSerializationCache.LFUEvictionPolicy, CompactSerializationCache.LRUEvictionPolicy, CompactSerializationCache.WrapperEvictionPolicy

Enclosing class:

CompactSerializationCache

protected abstract class CompactSerializationCache.InternalEvictionPolicy
extends Object
implements ConfigurableCacheMap.EvictionPolicy

InternalEvictionPolicy is an abstract base implementation of an ConfigurableCacheMap.EvictionPolicy used by this CompactSerializationCache.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	CompactSerializationCache.InternalEvictionPolicy.EvictionCandidate EvictionCandidate represents a candidate for eviction during the calculation of the eviction set, representing the key, its relative "weight" as assigned by the configured ConfigurableCacheMap.EvictionPolicy as well as its size in units.
protected class	CompactSerializationCache.InternalEvictionPolicy.EvictionVisitor SafeEntryVisitor implementation that calculates the set of eviction candidates.

Field Summary

Fields

Modifier and Type	Field and Description
protected BinaryLongMap.EntryVisitor	f_visitorTouchCount The singleton stateless visitor to update the touch-count map.
protected BinaryLongMap.EntryVisitor	f_visitorTouchTime The singleton stateless visitor to update the touch-time map.
protected long	m_ldtLastEvict The date-time of the last eviction.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	InternalEvictionPolicy()

Method Summary

Modifier and Type	Method and Description
protected abstract long	calculateWeight(Binary binKey) Calculate the "weight" of the entry associated with the specified key.
void	entryTouched(Binary binKey) This method is called by the cache to indicate that the entry for the specified key has been touched.
void	entryTouched(ConfigurableCacheMap.Entry entry) This method is called by the cache to indicate that an entry has been touched.
protected abstract ConfigurableCacheMap.EvictionPolicy	getConfiguredPolicy() Return the configured EvictionPolicy instance.
String	getName() Obtain the name of the eviction policy.
void	requestEviction(int cMaximum) This method is called by the cache when the cache requires the eviction policy to evict entries.
protected void	touchInternal(Binary binKey) Update the internally maintained "touch"-related statistics for the specified key (e.g. touch time and touch count).

Methods inherited from class java.lang.Object

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

Field Detail

m_ldtLastEvict

protected long m_ldtLastEvict

The date-time of the last eviction.

f_visitorTouchCount

protected final BinaryLongMap.EntryVisitor f_visitorTouchCount

The singleton stateless visitor to update the touch-count map.

f_visitorTouchTime

protected final BinaryLongMap.EntryVisitor f_visitorTouchTime

The singleton stateless visitor to update the touch-time map.

Constructor Detail

InternalEvictionPolicy

protected InternalEvictionPolicy()

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

Parameters:

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

entryTouched

public void entryTouched(ConfigurableCacheMap.Entry entry)

This method is called by the cache to indicate that an entry has been touched.

Specified by:

entryTouched in interface ConfigurableCacheMap.EvictionPolicy

Parameters:

entry - the Cache Entry that has been touched

getName

public String getName()

Obtain the name of the eviction policy. This is intended to be human readable for use in a monitoring tool; examples include "LRU" and "LFU".

Specified by:

getName in interface ConfigurableCacheMap.EvictionPolicy

Returns:

the name of the eviction policy

getConfiguredPolicy

protected abstract ConfigurableCacheMap.EvictionPolicy getConfiguredPolicy()

Return the configured EvictionPolicy instance.

Returns:

the configured EvictionPolicy

calculateWeight

protected abstract 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.

Parameters:

binKey - the key to calculate the weight for

entryTouched

public void entryTouched(Binary binKey)

This method is called by the cache to indicate that the entry for the specified key has been touched.

Parameters:

binKey - the key

touchInternal

protected void touchInternal(Binary binKey)

Update the internally maintained "touch"-related statistics for the specified key (e.g. touch time and touch count).

Parameters:

binKey - the key being touched