Package org.apache.cassandra.cache

Class CaffeineCache<K extends IMeasurableMemory,V extends IMeasurableMemory>

java.lang.Object

org.apache.cassandra.cache.CaffeineCache<K,V>

All Implemented Interfaces:

CacheSize, ICache<K,V>

public class CaffeineCache<K extends IMeasurableMemory,V extends IMeasurableMemory>
extends Object
implements ICache<K,V>

An adapter from a Caffeine cache to the ICache interface. This provides an on-heap cache using the W-TinyLFU eviction policy (http://arxiv.org/pdf/1512.00727.pdf), which has a higher hit rate than an LRU.

Method Summary

Modifier and Type	Method	Description
long	capacity()
void	clear()
boolean	containsKey(K key)
static <K extends IMeasurableMemory, V extends IMeasurableMemory> CaffeineCache<K,V>	create(long weightedCapacity)
static <K extends IMeasurableMemory, V extends IMeasurableMemory> CaffeineCache<K,V>	create(long weightedCapacity, com.github.benmanes.caffeine.cache.Weigher<K,V> weigher)	Initialize a cache with initial capacity with weightedCapacity
V	get(K key)
Iterator<K>	hotKeyIterator(int n)
boolean	isEmpty()
Iterator<K>	keyIterator()
void	put(K key, V value)
boolean	putIfAbsent(K key, V value)
void	remove(K key)
boolean	replace(K key, V old, V value)
void	setCapacity(long capacity)
int	size()
long	weightedSize()

Methods inherited from class java.lang.Object

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

Method Details

create

public static <K extends IMeasurableMemory,
V extends IMeasurableMemory>
CaffeineCache<K,V> create(long weightedCapacity,
 com.github.benmanes.caffeine.cache.Weigher<K,V> weigher)

Initialize a cache with initial capacity with weightedCapacity

create

public static <K extends IMeasurableMemory,
V extends IMeasurableMemory>
CaffeineCache<K,V> create(long weightedCapacity)

capacity

public long capacity()

Specified by:

capacity in interface CacheSize

setCapacity

public void setCapacity(long capacity)

Specified by:

setCapacity in interface CacheSize

isEmpty

public boolean isEmpty()

size

public int size()

Specified by:

size in interface CacheSize

weightedSize

public long weightedSize()

Specified by:

weightedSize in interface CacheSize

clear

public void clear()

Specified by:

clear in interface ICache<K extends IMeasurableMemory,V extends IMeasurableMemory>

get

public V get(K key)

Specified by:

get in interface ICache<K extends IMeasurableMemory,V extends IMeasurableMemory>

put

public void put(K key,
 V value)

Specified by:

put in interface ICache<K extends IMeasurableMemory,V extends IMeasurableMemory>

putIfAbsent

public boolean putIfAbsent(K key,
 V value)

Specified by:

putIfAbsent in interface ICache<K extends IMeasurableMemory,V extends IMeasurableMemory>

replace

public boolean replace(K key,
 V old,
 V value)

Specified by:

replace in interface ICache<K extends IMeasurableMemory,V extends IMeasurableMemory>

remove

public void remove(K key)

Specified by:

remove in interface ICache<K extends IMeasurableMemory,V extends IMeasurableMemory>

keyIterator

public Iterator<K> keyIterator()

Specified by:

keyIterator in interface ICache<K extends IMeasurableMemory,V extends IMeasurableMemory>

hotKeyIterator

public Iterator<K> hotKeyIterator(int n)

Specified by:

hotKeyIterator in interface ICache<K extends IMeasurableMemory,V extends IMeasurableMemory>

containsKey

public boolean containsKey(K key)

Specified by:

containsKey in interface ICache<K extends IMeasurableMemory,V extends IMeasurableMemory>