LRUMap (jackson-databind 2.4.4)

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

All Implemented Interfaces:

Serializable
```
public class LRUMap<K,V>
extends Object
implements 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 effecient handling of entries.

See Also:
Serialized Form

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 ConcurrentHashMap<K,V>`	`_map`
`protected int`	`_maxEntries`

Constructor Summary

Constructors
Constructor and Description

LRUMap(int initialEntries, int maxEntries)

Method Summary

Methods
Modifier and Type Method and Description

void clear()

V get(Object key)

V put(K key, V value)

protected Object readResolve()

int size()
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail
- _maxEntries
```
protected final transient int _maxEntries
```
- _map
```
protected final transient ConcurrentHashMap<K,V> _map
```
- _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

put
```
public V put(K key,
    V value)
```

get
```
public V get(Object key)
```

clear
```
public void clear()
```

size
```
public int size()
```

readResolve
```
protected Object readResolve()
```

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