org.apache.solr.search

Class LFUCache<K,V>

java.lang.Object

org.apache.solr.search.LFUCache<K,V>

All Implemented Interfaces:

SolrInfoMBean, SolrCache<K,V>

public class LFUCache<K,V>
extends Object
implements SolrCache<K,V>

SolrCache based on ConcurrentLFUCache implementation.

This implementation does not use a separate cleanup thread. Instead it uses the calling thread itself to do the cleanup when the size of the cache exceeds certain limits.

Also see SolrCaching

This API is experimental and subject to change

Since:

solr 3.6

See Also:

ConcurrentLFUCache, SolrCache

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.solr.search.SolrCache

SolrCache.State

Nested classes/interfaces inherited from interface org.apache.solr.core.SolrInfoMBean

SolrInfoMBean.Category

Constructor Summary

Constructors

Constructor and Description
LFUCache()

Method Summary

Modifier and Type	Method and Description
void	clear() :TODO: copy from Map
void	close() Frees any non-memory resources
V	get(K key) :TODO: copy from Map
SolrInfoMBean.Category	getCategory() Purpose of this Class
String	getDescription() Simple one or two line description
URL[]	getDocs() Documentation URL list.
String	getName() Simple common usage name, e.g.
String	getSource() CVS Source, SVN Source, etc
SolrCache.State	getState() Returns the last State set on this instance
NamedList	getStatistics() Any statistics this instance would like to be publicly available via the Solr Administration interface.
String	getVersion() Simple common usage version, e.g.
Object	init(Map args, Object persistence, CacheRegenerator regenerator) The initialization routine.
String	name() Name the Cache can be referenced with by SolrRequestHandlers.
V	put(K key, V value) :TODO: copy from Map
void	setState(SolrCache.State state) Set different cache states.
int	size() :TODO: copy from Map
String	toString()
void	warm(SolrIndexSearcher searcher, SolrCache old) Warm this cache associated with searcher using the old cache object.

Methods inherited from class java.lang.Object

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

Constructor Detail

LFUCache

public LFUCache()

Method Detail

init

public Object init(Map args,
                   Object persistence,
                   CacheRegenerator regenerator)

Description copied from interface: SolrCache

The initialization routine. Instance specific arguments are passed in the args map.

The persistence object will exist across different lifetimes of similar caches. For example, all filter caches will share the same persistence object, sometimes at the same time (it must be thread-safe). If null is passed, then the cache implementation should create and return a new persistence object. If not null, the passed in object should be returned again.

Since it will exist across the lifetime of many caches, care should be taken to not reference any particular cache instance and prevent it from being garbage collected (no using inner classes unless they are static).

The persistence object is designed to be used as a way for statistics to accumulate across all instances of the same type of cache, however the object may be of any type desired by the cache implementation.

The CacheRegenerator is what the cache uses during auto-warming to regenerate an item in the new cache from an entry in the old cache.

Specified by:

init in interface SolrCache<K,V>

name

public String name()

Description copied from interface: SolrCache

Name the Cache can be referenced with by SolrRequestHandlers. This method must return the identifier that the Cache instance expects SolrRequestHandlers to use when requesting access to it from the SolrIndexSearcher. It is strongly recommended that this method return the value of the "name" parameter from the init args. :TODO: verify this.

Specified by:

name in interface SolrCache<K,V>

size

public int size()

Description copied from interface: SolrCache

:TODO: copy from Map

Specified by:

size in interface SolrCache<K,V>

put

public V put(K key,
             V value)

Description copied from interface: SolrCache

:TODO: copy from Map

Specified by:

put in interface SolrCache<K,V>

get

public V get(K key)

Description copied from interface: SolrCache

:TODO: copy from Map

Specified by:

get in interface SolrCache<K,V>

clear

public void clear()

Description copied from interface: SolrCache

:TODO: copy from Map

Specified by:

clear in interface SolrCache<K,V>

setState

public void setState(SolrCache.State state)

Description copied from interface: SolrCache

Set different cache states. The state a cache is in can have an effect on how statistics are kept. The cache user (SolrIndexSearcher) will take care of switching cache states.

Specified by:

setState in interface SolrCache<K,V>

getState

public SolrCache.State getState()

Description copied from interface: SolrCache

Returns the last State set on this instance

Specified by:

getState in interface SolrCache<K,V>

See Also:

SolrCache.setState(org.apache.solr.search.SolrCache.State)

warm

public void warm(SolrIndexSearcher searcher,
                 SolrCache old)

Description copied from interface: SolrCache

Warm this cache associated with searcher using the old cache object. this and old will have the same concrete type.

Specified by:

warm in interface SolrCache<K,V>

close

public void close()

Description copied from interface: SolrCache

Frees any non-memory resources

Specified by:

close in interface SolrCache<K,V>

getName

public String getName()

Description copied from interface: SolrInfoMBean

Simple common usage name, e.g. BasicQueryHandler, or fully qualified clas name.

Specified by:

getName in interface SolrInfoMBean

getVersion

public String getVersion()

Description copied from interface: SolrInfoMBean

Simple common usage version, e.g. 2.0

Specified by:

getVersion in interface SolrInfoMBean

getDescription

public String getDescription()

Description copied from interface: SolrInfoMBean

Simple one or two line description

Specified by:

getDescription in interface SolrInfoMBean

getCategory

public SolrInfoMBean.Category getCategory()

Description copied from interface: SolrInfoMBean

Purpose of this Class

Specified by:

getCategory in interface SolrInfoMBean

getSource

public String getSource()

Description copied from interface: SolrInfoMBean

CVS Source, SVN Source, etc

Specified by:

getSource in interface SolrInfoMBean

getDocs

public URL[] getDocs()

Description copied from interface: SolrInfoMBean

Documentation URL list.

Suggested documentation URLs: Homepage for sponsoring project, FAQ on class usage, Design doc for class, Wiki, bug reporting URL, etc...

Specified by:

getDocs in interface SolrInfoMBean

getStatistics

public NamedList getStatistics()

Description copied from interface: SolrInfoMBean

Any statistics this instance would like to be publicly available via the Solr Administration interface.

Any Object type may be stored in the list, but only the toString() representation will be used.

Specified by:

getStatistics in interface SolrInfoMBean

toString

public String toString()

Overrides:

toString in class Object