Package org.apache.activemq.util
Class LRUCache<K,V>
- java.lang.Object
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- java.util.AbstractMap<K,V>
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- java.util.HashMap<K,V>
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- java.util.LinkedHashMap<K,V>
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- org.apache.activemq.util.LRUCache<K,V>
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- Type Parameters:
K
-V
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- All Implemented Interfaces:
Serializable
,Cloneable
,Map<K,V>
public class LRUCache<K,V> extends LinkedHashMap<K,V>
A Simple LRU Cache- See Also:
- Serialized Form
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Nested Class Summary
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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>
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Field Summary
Fields Modifier and Type Field Description protected int
maxCacheSize
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Constructor Summary
Constructors Constructor Description LRUCache()
Default constructor for an LRU Cache The default capacity is 10000LRUCache(int maximumCacheSize)
Constructs a LRUCache with a maximum capacityLRUCache(int initialCapacity, int maximumCacheSize, float loadFactor, boolean accessOrder)
Constructs an empty LRUCache instance with the specified initial capacity, maximumCacheSize,load factor and ordering mode.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
getMaxCacheSize()
protected void
onCacheEviction(Map.Entry<K,V> eldest)
protected boolean
removeEldestEntry(Map.Entry<K,V> eldest)
void
setMaxCacheSize(int maxCacheSize)
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Methods inherited from class java.util.LinkedHashMap
clear, containsValue, entrySet, forEach, get, getOrDefault, keySet, replaceAll, values
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Methods inherited from class java.util.HashMap
clone, compute, computeIfAbsent, computeIfPresent, containsKey, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size
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Methods inherited from class java.util.AbstractMap
equals, hashCode, toString
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Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, containsKey, equals, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size
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Constructor Detail
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LRUCache
public LRUCache()
Default constructor for an LRU Cache The default capacity is 10000
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LRUCache
public LRUCache(int maximumCacheSize)
Constructs a LRUCache with a maximum capacity- Parameters:
maximumCacheSize
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LRUCache
public LRUCache(int initialCapacity, int maximumCacheSize, float loadFactor, boolean accessOrder)
Constructs an empty LRUCache instance with the specified initial capacity, maximumCacheSize,load factor and ordering mode.- Parameters:
initialCapacity
- the initial capacity.maximumCacheSize
-loadFactor
- the load factor.accessOrder
- the ordering mode - true for access-order, false for insertion-order.- Throws:
IllegalArgumentException
- if the initial capacity is negative or the load factor is non-positive.
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Method Detail
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getMaxCacheSize
public int getMaxCacheSize()
- Returns:
- Returns the maxCacheSize.
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setMaxCacheSize
public void setMaxCacheSize(int maxCacheSize)
- Parameters:
maxCacheSize
- The maxCacheSize to set.
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removeEldestEntry
protected boolean removeEldestEntry(Map.Entry<K,V> eldest)
- Overrides:
removeEldestEntry
in classLinkedHashMap<K,V>
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