org.exoplatform.services.cache.invalidation
Class InvalidationExoCache<K extends Serializable,V>

java.lang.Object
  org.exoplatform.services.cache.invalidation.InvalidationExoCache<K,V>

All Implemented Interfaces:

CacheListener<K,InvalidationExoCache.HashCode<V>>, ExoCache<K,V>

public class InvalidationExoCache<K extends Serializable,V>
extends Object
implements ExoCache<K,V>, CacheListener<K,InvalidationExoCache.HashCode<V>>

This eXo cache type is a decorator allowing ExoCache instances that have big values or non serializable values to be replicated thanks to an invalidation mechanism. To prevent infinite loop described below, we replicate the hash code of the value such that if the hash code is the same, we don't invalidate the value locally

• Cluster node #1 puts (key1, value1) into the cache
• On cluster node #2 key1 is invalidated by the put call in node #1
• Node #2 re-loads key1 and puts (key1, value1) into the cache
• On cluster node #1 key1 is invalidated, so we get back to step #1

Version:

$Id$

Author:

Nicolas Filotto

Nested Class Summary

static class

InvalidationExoCache.HashCode<V> We use this class to propagate the hash code of the value efficiently over the network

Constructor Summary

InvalidationExoCache(ExoCache<K,V> delegate)

InvalidationExoCache(ExoCache<K,V> delegate, int concurrencyLevel)

Method Summary

void	addCacheListener(CacheListener<? super K,? super V> listener) Add a listener.
void	clearCache() Clears the cache.
V	get(Serializable name) 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()
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	onClearCache(CacheListenerContext context) The cache is globally cleared.
void	onExpire(CacheListenerContext context, K key, InvalidationExoCache.HashCode<V> obj) An entry is expired from the cache.
void	onGet(CacheListenerContext context, K key, InvalidationExoCache.HashCode<V> obj) An entry is retrieved from the cache.
void	onPut(CacheListenerContext context, K key, InvalidationExoCache.HashCode<V> obj) An entry is inserted in the cache.
void	onRemove(CacheListenerContext context, K key, InvalidationExoCache.HashCode<V> obj) An entry is removed from the cache.
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)
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.

Methods inherited from class java.lang.Object

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

Constructor Detail

InvalidationExoCache

public InvalidationExoCache(ExoCache<K,V> delegate)

Parameters:

delegate - the underneath eXo cache instance, we assume that the eXo cache implementation behind is fully functional.

InvalidationExoCache

public InvalidationExoCache(ExoCache<K,V> delegate,
                            int concurrencyLevel)

Parameters:

delegate - the underneath eXo cache instance, we assume that the eXo cache implementation behind is fully functional.

Method Detail

getName

public String getName()

Description copied from interface: ExoCache

Returns the cache name

Specified by:

getName in interface ExoCache<K extends Serializable,V>

Returns:

the cache name

See Also:

ExoCache.getName()

setName

public void setName(String name)

Description copied from interface: ExoCache

Sets the cache name.

Specified by:

setName in interface ExoCache<K extends Serializable,V>

Parameters:

name - the cache name

See Also:

ExoCache.setName(java.lang.String)

getLabel

public String getLabel()

Specified by:

getLabel in interface ExoCache<K extends Serializable,V>

See Also:

ExoCache.getLabel()

setLabel

public void setLabel(String s)

Specified by:

setLabel in interface ExoCache<K extends Serializable,V>

See Also:

ExoCache.setLabel(java.lang.String)

get

public V get(Serializable name)

Description copied from interface: ExoCache

Performs a lookup operation.

Specified by:

get in interface ExoCache<K extends Serializable,V>

Parameters:

name - the cache key

Returns:

the cached value which may be evaluated to null

See Also:

ExoCache.get(java.io.Serializable)

remove

public V remove(Serializable key)
         throws NullPointerException

Description copied from interface: ExoCache

Removes an entry from the cache.

Specified by:

remove in interface ExoCache<K extends Serializable,V>

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

See Also:

ExoCache.remove(java.io.Serializable)

put

public void put(K key,
                V value)
         throws NullPointerException

Description copied from interface: ExoCache

Performs a put in the cache.

Specified by:

put in interface ExoCache<K extends Serializable,V>

Parameters:

key - the cache key

value - the cached value

Throws:

NullPointerException - if the key is null

See Also:

ExoCache.put(java.io.Serializable, java.lang.Object)

putMap

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

Description copied from interface: ExoCache

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

Specified by:

putMap in interface ExoCache<K extends Serializable,V>

Parameters:

objs - the objects to put

Throws:

IllegalArgumentException - if the provided map contains a null key

See Also:

ExoCache.putMap(java.util.Map)

clearCache

public void clearCache()

Description copied from interface: ExoCache

Clears the cache.

Specified by:

clearCache in interface ExoCache<K extends Serializable,V>

See Also:

ExoCache.clearCache()

select

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

Description copied from interface: ExoCache

Selects a subset of the cache.

Specified by:

select in interface ExoCache<K extends Serializable,V>

Parameters:

selector - the selector

Throws:

Exception - any exception

See Also:

ExoCache.select(org.exoplatform.services.cache.CachedObjectSelector)

getCacheSize

public int getCacheSize()

Description copied from interface: ExoCache

Returns the number of entries in the cache.

Specified by:

getCacheSize in interface ExoCache<K extends Serializable,V>

Returns:

the size of the cache

See Also:

ExoCache.getCacheSize()

getMaxSize

public int getMaxSize()

Description copied from interface: ExoCache

Returns the maximum capacity of the cache.

Specified by:

getMaxSize in interface ExoCache<K extends Serializable,V>

Returns:

the maximum capacity

See Also:

ExoCache.getMaxSize()

setMaxSize

public void setMaxSize(int max)

Description copied from interface: ExoCache

Sets the maximum capacity of the cache.

Specified by:

setMaxSize in interface ExoCache<K extends Serializable,V>

Parameters:

max - the maximum capacity

See Also:

ExoCache.setMaxSize(int)

getLiveTime

public long getLiveTime()

Description copied from interface: ExoCache

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.

Specified by:

getLiveTime in interface ExoCache<K extends Serializable,V>

Returns:

the live time

See Also:

ExoCache.getLiveTime()

setLiveTime

public void setLiveTime(long period)

Description copied from interface: ExoCache

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

Specified by:

setLiveTime in interface ExoCache<K extends Serializable,V>

Parameters:

period - the live time

See Also:

ExoCache.setLiveTime(long)

getCacheHit

public int getCacheHit()

Description copied from interface: ExoCache

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

Specified by:

getCacheHit in interface ExoCache<K extends Serializable,V>

Returns:

the cache hits

See Also:

ExoCache.getCacheHit()

getCacheMiss

public int getCacheMiss()

Description copied from interface: ExoCache

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

Specified by:

getCacheMiss in interface ExoCache<K extends Serializable,V>

Returns:

the cache misses

See Also:

ExoCache.getCacheMiss()

getCachedObjects

public List<? extends V> getCachedObjects()

Description copied from interface: ExoCache

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

Specified by:

getCachedObjects in interface ExoCache<K extends Serializable,V>

Returns:

the list of cached objects

See Also:

ExoCache.getCachedObjects()

removeCachedObjects

public List<? extends V> removeCachedObjects()

Description copied from interface: ExoCache

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.

Specified by:

removeCachedObjects in interface ExoCache<K extends Serializable,V>

Returns:

the list of cached objects

See Also:

ExoCache.removeCachedObjects()

addCacheListener

public void addCacheListener(CacheListener<? super K,? super V> listener)
                      throws IllegalArgumentException

Description copied from interface: ExoCache

Add a listener.

Specified by:

addCacheListener in interface ExoCache<K extends Serializable,V>

Parameters:

listener - the listener to add

Throws:

IllegalArgumentException

See Also:

ExoCache.addCacheListener(org.exoplatform.services.cache.CacheListener)

isLogEnabled

public boolean isLogEnabled()

Specified by:

isLogEnabled in interface ExoCache<K extends Serializable,V>

See Also:

ExoCache.isLogEnabled()

setLogEnabled

public void setLogEnabled(boolean b)

Specified by:

setLogEnabled in interface ExoCache<K extends Serializable,V>

See Also:

ExoCache.setLogEnabled(boolean)

onExpire

public void onExpire(CacheListenerContext context,
                     K key,
                     InvalidationExoCache.HashCode<V> obj)
              throws Exception

An entry is expired from the cache.

Specified by:

onExpire in interface CacheListener<K extends Serializable,InvalidationExoCache.HashCode<V>>

Parameters:

context - the listener context

key - the entry key

obj - the entry value

Throws:

Exception - any exception

onRemove

public void onRemove(CacheListenerContext context,
                     K key,
                     InvalidationExoCache.HashCode<V> obj)
              throws Exception

An entry is removed from the cache.

Specified by:

onRemove in interface CacheListener<K extends Serializable,InvalidationExoCache.HashCode<V>>

Parameters:

context - the listener context

key - the entry key

obj - the entry value

Throws:

Exception - any exception

onPut

public void onPut(CacheListenerContext context,
                  K key,
                  InvalidationExoCache.HashCode<V> obj)
           throws Exception

An entry is inserted in the cache.

Specified by:

onPut in interface CacheListener<K extends Serializable,InvalidationExoCache.HashCode<V>>

Parameters:

context - the listener context

key - the entry key

obj - the entry value

Throws:

Exception - any exception

onGet

public void onGet(CacheListenerContext context,
                  K key,
                  InvalidationExoCache.HashCode<V> obj)
           throws Exception

An entry is retrieved from the cache.

Specified by:

onGet in interface CacheListener<K extends Serializable,InvalidationExoCache.HashCode<V>>

Parameters:

context - the listener context

key - the entry key

obj - the entry value

Throws:

Exception - any exception

onClearCache

public void onClearCache(CacheListenerContext context)
                  throws Exception

Description copied from interface: CacheListener

The cache is globally cleared.

Specified by:

onClearCache in interface CacheListener<K extends Serializable,InvalidationExoCache.HashCode<V>>

Parameters:

context - the listener context

Throws:

Exception - any exception

See Also:

CacheListener.onClearCache(org.exoplatform.services.cache.CacheListenerContext)