CompactSerializationCache.LFUEvictionPolicy (Oracle® Coherence Java API Reference)

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

Fields
Modifier and Type Field Description

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

Constructors
Modifier Constructor Description

protected LFUEvictionPolicy()

Method Summary

All Methods Instance Methods Concrete Methods
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 Detail
  - f_visitor
```
protected final CompactSerializationCache.TouchCountVisitor f_visitor
```
    The singleton TouchCountVisitor (eviction is single-threaded).
- Constructor Detail
  - LFUEvictionPolicy
```
protected 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
    
    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