Package org.aksw.commons.util.cache

Class CacheView<KF,KB,V>

java.lang.Object

org.aksw.commons.util.cache.CacheView<KF,KB,V>

Type Parameters:

KF - The frontend key type

KB - The backend key type

V - The value type

All Implemented Interfaces:

com.google.common.cache.Cache<KF,V>

public class CacheView<KF,KB,V>
extends Object
implements com.google.common.cache.Cache<KF,V>

A view over a cache which can place 'local' keys into a shared cache. For example, local keys could be offsets in a file, whereas global keys include the file name.

Field Summary

Fields

Modifier and Type	Field	Description
protected com.google.common.cache.Cache<KB,V>	backend	The delegate cache
protected Predicate<KB>	backendKeyFilter	A predicate that hides cache entries unrelated to this cache view.
protected com.google.common.base.Converter<KF,KB>	keyConverter

Constructor Summary

Constructors

Constructor	Description
CacheView(com.google.common.cache.Cache<KB,V> backend, com.google.common.base.Converter<KF,KB> keyConverter, Predicate<KB> backendFilter)

Method Summary

Modifier and Type	Method	Description
ConcurrentMap<KF,V>	asMap()
void	cleanUp()
protected List<KB>	convert(Object key)
V	get(KF key, Callable<? extends V> loader)
com.google.common.collect.ImmutableMap<KF,V>	getAllPresent(Iterable<? extends Object> keys)
com.google.common.cache.Cache<KB,V>	getBackend()
V	getIfPresent(Object key)
void	invalidate(Object key)
void	invalidateAll()
void	invalidateAll(Iterable<? extends Object> keys)
void	put(KF key, V value)
void	putAll(Map<? extends KF,? extends V> m)
protected KB	safeToBackend(KF key)
long	size()
com.google.common.cache.CacheStats	stats()

Methods inherited from class java.lang.Object

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

Field Details

backend

protected com.google.common.cache.Cache<KB,V> backend

The delegate cache

keyConverter

protected com.google.common.base.Converter<KF,KB> keyConverter

backendKeyFilter

protected Predicate<KB> backendKeyFilter

A predicate that hides cache entries unrelated to this cache view. Note that every backend key derived from this view must succeed the filter. This means: backendFilter.test(keyMapper.convert(frontendKey)) must always evaluate to true.

Constructor Details

CacheView

public CacheView(com.google.common.cache.Cache<KB,V> backend,
 com.google.common.base.Converter<KF,KB> keyConverter,
 Predicate<KB> backendFilter)

Method Details

getBackend

public com.google.common.cache.Cache<KB,V> getBackend()

safeToBackend

protected KB safeToBackend(KF key)

convert

protected List<KB> convert(Object key)

getIfPresent

public V getIfPresent(Object key)

Specified by:

getIfPresent in interface com.google.common.cache.Cache<KF,KB>

get

public V get(KF key,
 Callable<? extends V> loader)
      throws ExecutionException

Specified by:

get in interface com.google.common.cache.Cache<KF,KB>

Throws:

ExecutionException

getAllPresent

public com.google.common.collect.ImmutableMap<KF,V> getAllPresent(Iterable<? extends Object> keys)

Specified by:

getAllPresent in interface com.google.common.cache.Cache<KF,KB>

put

public void put(KF key,
 V value)

Specified by:

put in interface com.google.common.cache.Cache<KF,KB>

putAll

public void putAll(Map<? extends KF,? extends V> m)

Specified by:

putAll in interface com.google.common.cache.Cache<KF,KB>

invalidate

public void invalidate(Object key)

Specified by:

invalidate in interface com.google.common.cache.Cache<KF,KB>

invalidateAll

public void invalidateAll(Iterable<? extends Object> keys)

Specified by:

invalidateAll in interface com.google.common.cache.Cache<KF,KB>

invalidateAll

public void invalidateAll()

Specified by:

invalidateAll in interface com.google.common.cache.Cache<KF,KB>

size

public long size()

Specified by:

size in interface com.google.common.cache.Cache<KF,KB>

stats

public com.google.common.cache.CacheStats stats()

Specified by:

stats in interface com.google.common.cache.Cache<KF,KB>

asMap

public ConcurrentMap<KF,V> asMap()

Specified by:

asMap in interface com.google.common.cache.Cache<KF,KB>

cleanUp

public void cleanUp()

Specified by:

cleanUp in interface com.google.common.cache.Cache<KF,KB>