Package io.goobi.viewer.controller.model

Class CachingMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<K,V>

io.goobi.viewer.controller.model.CachingMap<K,V>

Type Parameters:

K - the type of keys maintained by this map

V - the type of mapped values

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>, SequencedMap<K,V>

public class CachingMap<K,V>
extends LinkedHashMap<K,V>

A thread-safe, size-bounded LinkedHashMap that evicts the eldest entry when the map exceeds its configured maximum capacity. Suitable as a simple in-memory LRU cache for moderate data volumes.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Constructor Summary

Constructors

Constructor	Description
CachingMap(long maxSize)

Method Summary

Modifier and Type	Method	Description
V	computeIfAbsent(K arg0, Function<? super K,? extends V> arg1)
V	get(Object key)
V	getOrDefault(Object key, V defaultValue)
V	put(K key, V value)
protected boolean	removeEldestEntry(Map.Entry<K,V> eldest)

Methods inherited from class java.util.LinkedHashMap

clear, containsValue, entrySet, forEach, keySet, newLinkedHashMap, putFirst, putLast, replaceAll, reversed, sequencedEntrySet, sequencedKeySet, sequencedValues, values

Methods inherited from class java.util.HashMap

clone, compute, computeIfPresent, containsKey, isEmpty, merge, newHashMap, putAll, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfPresent, containsKey, equals, hashCode, isEmpty, merge, putAll, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from interface java.util.SequencedMap

firstEntry, lastEntry, pollFirstEntry, pollLastEntry

Constructor Details

CachingMap

public CachingMap(long maxSize)

Method Details

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

Overrides:

get in class LinkedHashMap<K,V>

getOrDefault

public V getOrDefault(Object key,
 V defaultValue)

Specified by:

getOrDefault in interface Map<K,V>

Overrides:

getOrDefault in class LinkedHashMap<K,V>

put

public V put(K key,
 V value)

Specified by:

put in interface Map<K,V>

Overrides:

put in class HashMap<K,V>

computeIfAbsent

public V computeIfAbsent(K arg0,
 Function<? super K,? extends V> arg1)

Specified by:

computeIfAbsent in interface Map<K,V>

Overrides:

computeIfAbsent in class HashMap<K,V>

removeEldestEntry

protected boolean removeEldestEntry(Map.Entry<K,V> eldest)

Overrides:

removeEldestEntry in class LinkedHashMap<K,V>