LRUMap (The Adobe Experience Manager SDK 2023.12.14538.20231205T165334Z-231200)

java.lang.Object
- com.fasterxml.jackson.databind.util.LRUMap<K,V>

All Implemented Interfaces:

LookupCache<K,V>, java.io.Serializable
```
public class LRUMap<K,V>
extends java.lang.Object
implements LookupCache<K,V>, 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.
Since Jackson 2.12, there has been pluggable LookupCache interface which allows users, frameworks, provide their own cache implementations.
Snce Jackson 2.14, the implementation
- Evicts the least recently used entry when max size is reached
- Is thread-safe and does NOT require external synchronization
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()`	Method for removing all contents this cache has.
`void`	`contents(java.util.function.BiConsumer<K,V> consumer)`
`V`	`get(java.lang.Object key)`	NOTE: key is of type Object only to retain binary backwards-compatibility
`V`	`put(K key, V value)`
`V`	`putIfAbsent(K key, V value)`
`int`	`size()`

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - LRUMap
```
public LRUMap(int initialEntries,
              int maxEntries)
```
- Method Detail
  - put
```
public V put(K key,
             V value)
```
    Specified by:
    
    put in interface LookupCache<K,V>
  - putIfAbsent
```
public V putIfAbsent(K key,
                     V value)
```
    Specified by:
    
    putIfAbsent in interface LookupCache<K,V>
    
    Since:
    
    2.5
  - get
```
public V get(java.lang.Object key)
```
    Description copied from interface: LookupCache
    
    NOTE: key is of type Object only to retain binary backwards-compatibility
    
    Specified by:
    
    get in interface LookupCache<K,V>
    
    Returns:
    
    value associated with key (can return null)
  - clear
```
public void clear()
```
    Description copied from interface: LookupCache
    
    Method for removing all contents this cache has.
    
    Specified by:
    
    clear in interface LookupCache<K,V>
  - size
```
public int size()
```
    Specified by:
    
    size in interface LookupCache<K,V>
    
    Returns:
    
    Number of entries currently in cache: may be approximate, only to be used for diagnostics, metrics reporting
  - contents
```
public void contents(java.util.function.BiConsumer<K,V> consumer)
```