Class LRUMap<K,V>
- java.lang.Object
-
- com.fasterxml.jackson.databind.util.LRUMap<K,V>
-
- All Implemented Interfaces:
java.io.Serializable
public class LRUMap<K,V> extends java.lang.Object implements java.io.Serializable
Helper for simple bounded maps used for reusing lookup values.Note that serialization behavior is such that contents are NOT serialized, on assumption that all use cases are for caching where persistence does not make sense. The only thing serialized is the cache size of Map.
NOTE: since version 2.4.2, this is NOT an LRU-based at all; reason being that it is not possible to use JDK components that do LRU _AND_ perform well wrt synchronization on multi-core systems. So we choose efficient synchronization over potentially more efficient handling of entries.
And yes, there are efficient LRU implementations such as concurrentlinkedhashmap; but at this point we really try to keep external deps to minimum. But perhaps a shaded variant may be used one day.
- See Also:
- Serialized Form
-
-
Constructor Summary
Constructors Constructor Description LRUMap(int initialEntries, int maxEntries)
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
clear()
V
get(java.lang.Object key)
V
put(K key, V value)
V
putIfAbsent(K key, V value)
int
size()
-