org.apache.solr.search

Interface SolrCache<K,V>

All Superinterfaces:

AutoCloseable, SolrInfoBean, SolrMetricProducer

All Known Implementing Classes:

CaffeineCache, FastLRUCache, LFUCache, LRUCache, SolrCacheHolder

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

Field Summary

Fields

Modifier and Type	Field and Description
static String	CLEANUP_THREAD_PARAM
static String	EVICTIONS_PARAM
static String	HIT_RATIO_PARAM
static String	HITS_PARAM
static String	INITIAL_SIZE_PARAM
static String	INSERTS_PARAM
static String	LOOKUPS_PARAM
static String	MAX_IDLE_TIME_PARAM
static String	MAX_RAM_MB_PARAM
static String	MAX_SIZE_PARAM
static String	RAM_BYTES_USED_PARAM
static String	SHOW_ITEMS_PARAM
static String	SIZE_PARAM

Method Summary

Modifier and Type	Method and Description
void	clear() :TODO: copy from Map
default void	close() Frees any non-memory resources
V	computeIfAbsent(K key, Function<? super K,? extends V> mappingFunction) Get an existing element or atomically compute it if missing.
V	get(K key) :TODO: copy from Map
int	getMaxRamMB() Returns maximum size limit (in MB) if set and supported, -1 otherwise.
int	getMaxSize() Returns maximum size limit (number of items) if set and supported, -1 otherwise.
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
V	remove(K key)
void	setMaxRamMB(int maxRamMB) Set maximum size limit (in MB), or -1 for unlimited.
void	setMaxSize(int maxSize) Set maximum size limit (number of items), or -1 for unlimited.
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

getSolrMetricsContext, getUniqueMetricTag, initializeMetrics, initializeMetrics

Field Detail

HIT_RATIO_PARAM

static final String HIT_RATIO_PARAM

See Also:

Constant Field Values

HITS_PARAM

static final String HITS_PARAM

See Also:

Constant Field Values

INSERTS_PARAM

static final String INSERTS_PARAM

See Also:

Constant Field Values

EVICTIONS_PARAM

static final String EVICTIONS_PARAM

See Also:

Constant Field Values

LOOKUPS_PARAM

static final String LOOKUPS_PARAM

See Also:

Constant Field Values

SIZE_PARAM

static final String SIZE_PARAM

See Also:

Constant Field Values

MAX_SIZE_PARAM

static final String MAX_SIZE_PARAM

See Also:

Constant Field Values

RAM_BYTES_USED_PARAM

static final String RAM_BYTES_USED_PARAM

See Also:

Constant Field Values

MAX_RAM_MB_PARAM

static final String MAX_RAM_MB_PARAM

See Also:

Constant Field Values

MAX_IDLE_TIME_PARAM

static final String MAX_IDLE_TIME_PARAM

See Also:

Constant Field Values

INITIAL_SIZE_PARAM

static final String INITIAL_SIZE_PARAM

See Also:

Constant Field Values

CLEANUP_THREAD_PARAM

static final String CLEANUP_THREAD_PARAM

See Also:

Constant Field Values

SHOW_ITEMS_PARAM

static final String SHOW_ITEMS_PARAM

See Also:

Constant Field Values

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

remove

V remove(K key)

computeIfAbsent

V computeIfAbsent(K key,
                  Function<? super K,? extends V> mappingFunction)

Get an existing element or atomically compute it if missing.

Parameters:

key - key

mappingFunction - function to compute the element. If the function returns a null result the cache mapping will not be created. NOTE: this function must NOT attempt to modify any mappings in the cache.

Returns:

existing or newly computed value, null if there was no existing value and it was not possible to compute a new value (in which case the new mapping won't be created).

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

default void close()
            throws Exception

Frees any non-memory resources

Specified by:

close in interface AutoCloseable

Specified by:

close in interface SolrMetricProducer

Throws:

Exception

getMaxSize

int getMaxSize()

Returns maximum size limit (number of items) if set and supported, -1 otherwise.

setMaxSize

void setMaxSize(int maxSize)

Set maximum size limit (number of items), or -1 for unlimited. Note: this has effect only on implementations that support it, it's a no-op otherwise

getMaxRamMB

int getMaxRamMB()

Returns maximum size limit (in MB) if set and supported, -1 otherwise.

setMaxRamMB

void setMaxRamMB(int maxRamMB)

Set maximum size limit (in MB), or -1 for unlimited. Note: this has effect only on implementations that support it, it's a no-op otherwise.