LRUMap (jackson-databind 2.2.3)

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

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>
```
public class LRUMap<K,V>
extends LinkedHashMap<K,V>
implements Serializable
```
Helper for simple bounded LRU 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.

See Also:
Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from class java.util.AbstractMap
  AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Field Summary

Fields
Modifier and Type	Field and Description
`protected int`	`_jdkSerializeMaxEntries` Ugly hack, to work through the requirement that _value is indeed final, and that JDK serialization won't call ctor(s) if Serializable is implemented.
`protected int`	`_maxEntries`

Constructor Summary

Constructors
Constructor and Description

LRUMap(int initialEntries, int maxEntries)

Method Summary

Methods
Modifier and Type Method and Description

protected Object readResolve()

protected boolean removeEldestEntry(Map.Entry<K,V> eldest)
- Methods inherited from class java.util.LinkedHashMap
  clear, containsValue, get
- Methods inherited from class java.util.HashMap
  clone, containsKey, entrySet, isEmpty, keySet, put, putAll, remove, size, values
- 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
  containsKey, entrySet, equals, hashCode, isEmpty, keySet, put, putAll, remove, size, values

- Field Detail
  - _maxEntries
```
protected final int _maxEntries
```
  - _jdkSerializeMaxEntries
```
protected transient int _jdkSerializeMaxEntries
```
    Ugly hack, to work through the requirement that _value is indeed final, and that JDK serialization won't call ctor(s) if Serializable is implemented.
    
    Since:
    
    2.1
- Constructor Detail
  - LRUMap
```
public LRUMap(int initialEntries,
      int maxEntries)
```
- Method Detail
  - removeEldestEntry
```
protected boolean removeEldestEntry(Map.Entry<K,V> eldest)
```
    Overrides:
    
    removeEldestEntry in class LinkedHashMap<K,V>
  - readResolve
```
protected Object readResolve()
```

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