org.apache.cassandra.cache

Interface ICache<K,V>

All Known Implementing Classes:

ConcurrentLinkedHashCache, SerializingCache

public interface ICache<K,V>

This is similar to the Map interface, but requires maintaining a given capacity and does not require put or remove to return values, which lets SerializingCache be more efficient by avoiding deserialize except on get.

Method Summary

Methods

Modifier and Type	Method and Description
long	capacity()
void	clear()
boolean	containsKey(K key)
V	get(K key)
java.util.Set<K>	hotKeySet(int n)
boolean	isPutCopying()
java.util.Set<K>	keySet()
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()

Method Detail

capacity

long capacity()

setCapacity

void setCapacity(long capacity)

put

void put(K key,
       V value)

putIfAbsent

boolean putIfAbsent(K key,
                  V value)

replace

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

get

V get(K key)

remove

void remove(K key)

size

int size()

weightedSize

long weightedSize()

clear

void clear()

keySet

java.util.Set<K> keySet()

hotKeySet

java.util.Set<K> hotKeySet(int n)

containsKey

boolean containsKey(K key)

isPutCopying

boolean isPutCopying()

Returns:

true if the cache implementation inherently copies the cached values; otherwise, the caller should copy manually before caching shared values like Thrift ByteBuffers.