org.exoplatform.services.cache

Interface ExoCache<K extends Serializable,V>

Type Parameters:

K - the type of keys maintained by this cache

V - the type of cached values

public interface ExoCache<K extends Serializable,V>

Created by The eXo Platform SAS
A bare cache.

Author:

Tuan Nguyen

Level API:

Platform

Method Summary

Methods

Modifier and Type	Method and Description
void	addCacheListener(org.exoplatform.services.cache.CacheListener<? super K,? super V> listener) Add a listener.
void	clearCache() Clears the cache.
V	get(Serializable key) Performs a lookup operation.
List<? extends V>	getCachedObjects() Returns a list of cached object that are considered as valid when the method is called.
int	getCacheHit() Returns the number of time the cache was queried and a valid entry was returned.
int	getCacheMiss() Returns the number of time the cache was queried and no entry was returned.
int	getCacheSize() Returns the number of entries in the cache.
String	getLabel() Returns the cache label
long	getLiveTime() Returns the maximum life time of an entry in the cache.
int	getMaxSize() Returns the maximum capacity of the cache.
String	getName() Returns the cache name
boolean	isLogEnabled()
void	put(K key, V value) Performs a put in the cache.
void	putMap(Map<? extends K,? extends V> objs) Performs a put of all the entries provided by the map argument.
V	remove(Serializable key) Removes an entry from the cache.
List<? extends V>	removeCachedObjects() Clears the cache and returns the list of cached object that are considered as valid when the method is called.
void	select(CachedObjectSelector<? super K,? super V> selector) Selects a subset of the cache.
void	setLabel(String s) Sets the cache label
void	setLiveTime(long period) Sets the maximum life time of an entry in the cache.
void	setLogEnabled(boolean b)
void	setMaxSize(int max) Sets the maximum capacity of the cache.
void	setName(String name) Sets the cache name.

Method Detail

getName

String getName()

Returns the cache name

Returns:

the cache name

setName

void setName(String name)

Sets the cache name.

Parameters:

name - the cache name

getLabel

String getLabel()

Returns the cache label

Returns:

the cache label

setLabel

void setLabel(String s)

Sets the cache label

Parameters:

s - the cache label

get

V get(Serializable key)

Performs a lookup operation.

Parameters:

key - the cache key

Returns:

the cached value which may be evaluated to null

remove

V remove(Serializable key)
         throws NullPointerException

Removes an entry from the cache.

Parameters:

key - the cache key

Returns:

the previously cached value or null if no entry existed or that entry value was evaluated to null

Throws:

NullPointerException - if the provided key is null

put

void put(K key,
       V value)
         throws NullPointerException

Performs a put in the cache.

Parameters:

key - the cache key

value - the cached value

Throws:

NullPointerException - if the key is null

putMap

void putMap(Map<? extends K,? extends V> objs)
            throws NullPointerException,
                   IllegalArgumentException

Performs a put of all the entries provided by the map argument.

Parameters:

objs - the objects to put

Throws:

NullPointerException - if the provided argument is null

IllegalArgumentException - if the provided map contains a null key

clearCache

void clearCache()

Clears the cache.

select

void select(CachedObjectSelector<? super K,? super V> selector)
            throws Exception

Selects a subset of the cache.

Parameters:

selector - the selector

Throws:

Exception - any exception

getCacheSize

int getCacheSize()

Returns the number of entries in the cache.

Returns:

the size of the cache

getMaxSize

int getMaxSize()

Returns the maximum capacity of the cache.

Returns:

the maximum capacity

setMaxSize

void setMaxSize(int max)

Sets the maximum capacity of the cache.

Parameters:

max - the maximum capacity

getLiveTime

long getLiveTime()

Returns the maximum life time of an entry in the cache. The life time is a value in seconds, a negative value means that the life time is infinite.

Returns:

the live time

setLiveTime

void setLiveTime(long period)

Sets the maximum life time of an entry in the cache.

Parameters:

period - the live time

getCacheHit

int getCacheHit()

Returns the number of time the cache was queried and a valid entry was returned.

Returns:

the cache hits

getCacheMiss

int getCacheMiss()

Returns the number of time the cache was queried and no entry was returned.

Returns:

the cache misses

getCachedObjects

List<? extends V> getCachedObjects()
                                   throws Exception

Returns a list of cached object that are considered as valid when the method is called. Any non valid object will not be returnted.

Returns:

the list of cached objects

Throws:

Exception - any exception

removeCachedObjects

List<? extends V> removeCachedObjects()

Clears the cache and returns the list of cached object that are considered as valid when the method is called. Any non valid object will not be returned.

Returns:

the list of cached objects

Throws:

Exception - any exception

addCacheListener

void addCacheListener(org.exoplatform.services.cache.CacheListener<? super K,? super V> listener)
                      throws NullPointerException

Add a listener.

Parameters:

listener - the listener to add

Throws:

NullPointerException - if the listener is null

isLogEnabled

boolean isLogEnabled()

setLogEnabled

void setLogEnabled(boolean b)