Package org.apache.struts2.ognl

Class OgnlLRUCache<K,V>

java.lang.Object
org.apache.struts2.ognl.OgnlLRUCache<K,V>
Type Parameters:
K - The type for the cache key entries
V - The type for the cache value entries
All Implemented Interfaces:
OgnlCache<K,V>
public class OgnlLRUCache<K,V> extends Object implements OgnlCache<K,V>

A basic OGNL LRU cache implementation.

The implementation utilizes a Collections.synchronizedMap(java.util.Map) backed by a LinkedHashMap. May be replaced by a more efficient implementation in the future.

Setting too low an eviction limit will produce more overhead than value.

Setting too high an eviction limit may also produce more overhead than value.

An appropriate eviction limit will need to be determined on an individual application basis.

  • Constructor Details

    • OgnlLRUCache

      public OgnlLRUCache(int evictionLimit, int initialCapacity, float loadFactor)

  • Method Details

    • get

      public V get(K key)
      Specified by:
      get in interface OgnlCache<K,V>

    • computeIfAbsent

      public V computeIfAbsent(K key, Function<? super K,? extends V> mappingFunction)
      Specified by:
      computeIfAbsent in interface OgnlCache<K,V>

    • put

      public void put(K key, V value)
      Specified by:
      put in interface OgnlCache<K,V>

    • putIfAbsent

      public void putIfAbsent(K key, V value)
      Specified by:
      putIfAbsent in interface OgnlCache<K,V>

    • remove

      public V remove(K key)
      Description copied from interface: OgnlCache
      Removes the mapping for the given key, if present.
      Specified by:
      remove in interface OgnlCache<K,V>
      Parameters:
      key - the key to remove
      Returns:
      the previous value associated with the key, or null if none

    • size

      public int size()
      Specified by:
      size in interface OgnlCache<K,V>

    • clear

      public void clear()
      Specified by:
      clear in interface OgnlCache<K,V>

    • getEvictionLimit

      public int getEvictionLimit()
      Specified by:
      getEvictionLimit in interface OgnlCache<K,V>

    • setEvictionLimit

      public void setEvictionLimit(int cacheEvictionLimit)
      Specified by:
      setEvictionLimit in interface OgnlCache<K,V>