Package org.apache.activemq.artemis.selector.impl

Class LRUCache<K,​V>

  • Type Parameters:
    K -
    V -
    All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, java.util.Map<K,​V>
    public class LRUCache<K,​V>
extends java.util.LinkedHashMap<K,​V>
    A Simple LRU Cache
    See Also:
    Serialized Form

    • Nested Class Summary

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

        java.util.AbstractMap.SimpleEntry<K extends java.lang.Object,​V extends java.lang.Object>, java.util.AbstractMap.SimpleImmutableEntry<K extends java.lang.Object,​V extends java.lang.Object>

    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected int maxCacheSize  

    • Constructor Summary

      Constructors 
      Constructor Description
      LRUCache()
      Default constructor for an LRU Cache The default capacity is 10000
      LRUCache​(int maximumCacheSize)
      Constructs a LRUCache with a maximum capacity
      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.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int getMaxCacheSize()  
      protected void onCacheEviction​(java.util.Map.Entry<K,​V> eldest)  
      protected boolean removeEldestEntry​(java.util.Map.Entry<K,​V> eldest)  
      void setMaxCacheSize​(int maxCacheSize)  

      • 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

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

    • Field Detail

      • maxCacheSize

        protected int maxCacheSize

    • Constructor Detail

      • LRUCache

        public LRUCache()
        Default constructor for an LRU Cache The default capacity is 10000

      • LRUCache

        public LRUCache​(int maximumCacheSize)
        Constructs a LRUCache with a maximum capacity
        Parameters:
        maximumCacheSize -

      • 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:
        java.lang.IllegalArgumentException - if the initial capacity is negative or the load factor is non-positive.

    • Method Detail

      • getMaxCacheSize

        public int getMaxCacheSize()
        Returns:
        Returns the maxCacheSize.

      • setMaxCacheSize

        public void setMaxCacheSize​(int maxCacheSize)
        Parameters:
        maxCacheSize - The maxCacheSize to set.

      • removeEldestEntry

        protected boolean removeEldestEntry​(java.util.Map.Entry<K,​V> eldest)
        Overrides:
        removeEldestEntry in class java.util.LinkedHashMap<K,​V>

      • onCacheEviction

        protected void onCacheEviction​(java.util.Map.Entry<K,​V> eldest)