Package org.apache.sling.scripting.core.impl.helper

Class CachingMap<T>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<String,SoftReference<T>>

org.apache.sling.scripting.core.impl.helper.CachingMap<T>

Type Parameters:

T - the type to which SoftReferences will be kept

All Implemented Interfaces:

Serializable, Cloneable, Map<String,SoftReference<T>>

public class CachingMap<T>
extends LinkedHashMap<String,SoftReference<T>>

The CachingMap class offers an implementation of a LinkedHashMap that can be used for caches. The maps' values are SoftReferences, such that garbage collection can be performed on the cache, if needed.

Read / write operations are NOT synchronised.

See Also:

• Serialized Form

Nested Class Summary

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

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

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
CachingMap(int capacity)	Creates a caching map with a maximum capacity equal to the capacity parameter.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
int	hashCode()
protected boolean	removeEldestEntry(Map.Entry<String,SoftReference<T>> eldest)

Methods inherited from class java.util.LinkedHashMap

clear, containsValue, entrySet, forEach, get, getOrDefault, keySet, replaceAll, values

Methods inherited from class java.util.HashMap

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

Methods inherited from class java.util.AbstractMap

toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, containsKey, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Constructor Details

CachingMap

public CachingMap(int capacity)

Creates a caching map with a maximum capacity equal to the capacity parameter.

Parameters:

capacity - the maximum capacity; if capacity < 1 then this map will always remove the latest added element

Method Details

removeEldestEntry

protected boolean removeEldestEntry(Map.Entry<String,SoftReference<T>> eldest)

Overrides:

removeEldestEntry in class LinkedHashMap<String,SoftReference<T>>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<String,SoftReference<T>>

Overrides:

hashCode in class AbstractMap<String,SoftReference<T>>

equals

public boolean equals(Object obj)

Specified by:

equals in interface Map<String,SoftReference<T>>

Overrides:

equals in class AbstractMap<String,SoftReference<T>>