org.apache.solr.search

Interface SolrCache<K,V>

All Superinterfaces:

SolrInfoBean, SolrMetricProducer

All Known Implementing Classes:

FastLRUCache, LFUCache, LRUCache

public interface SolrCache<K,V>
extends SolrInfoBean, SolrMetricProducer

Primary API for dealing with Solr's internal caches.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	SolrCache.State Enumeration of possible States for cache instances.

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

SolrInfoBean.Category, SolrInfoBean.Group

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
SolrCache.State	getState() Returns the last State set on this instance
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
void	warm(SolrIndexSearcher searcher, SolrCache<K,V> old) Warm this cache associated with searcher using the old cache object.

Methods inherited from interface org.apache.solr.core.SolrInfoBean

getCategory, getDescription, getMetricNames, getMetricRegistry, getMetricsSnapshot, getName, registerMetricName

Methods inherited from interface org.apache.solr.metrics.SolrMetricProducer

initializeMetrics

Method Detail

init

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

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.

name

String name()

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.

size

int size()

:TODO: copy from Map

put

V put(K key,
      V value)

:TODO: copy from Map

get

V get(K key)

:TODO: copy from Map

clear

void clear()

:TODO: copy from Map

setState

void setState(SolrCache.State state)

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.

getState

SolrCache.State getState()

Returns the last State set on this instance

See Also:

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

warm

void warm(SolrIndexSearcher searcher,
          SolrCache<K,V> old)

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

close

void close()

Frees any non-memory resources