LookupCache (jackson-databind 2.18.1)

All Known Implementing Classes:

LRUMap
```
public interface LookupCache<K,V>
```
An interface describing the required API for the Jackson-databind Type cache.
Note that while interface itself does not specify synchronization requirements for implementations, specific use cases do. Typically implementations are expected to be thread-safe, that is, to handle synchronization.

Since:

2.12 (for forwards-compatiblity with 3.0)

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`void`	`clear()` Method for removing all contents this cache has.
`default void`	`contents(BiConsumer<K,V> consumer)` Method to apply operation on cache contents without exposing them.
`default LookupCache<K,V>`	`emptyCopy()` Method needed for creating clones but without contents.
`V`	`get(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()`

- Method Detail
  - contents
```
default void contents(BiConsumer<K,V> consumer)
```
    Method to apply operation on cache contents without exposing them.
    Default implementation throws UnsupportedOperationException. Implementations are required to override this method.
    
    Parameters:
    
    consumer - Operation to apply on cache contents.
    
    Throws:
    
    UnsupportedOperationException - if implementation does not override this method.
    
    Since:
    
    2.16
  - emptyCopy
```
default LookupCache<K,V> emptyCopy()
```
    Method needed for creating clones but without contents.
    Default implementation throws UnsupportedOperationException. Implementations are required to override this method.
    
    Throws:
    
    UnsupportedOperationException - if implementation does not override this method.
    
    Since:
    
    2.16
  - size
```
int size()
```
    Returns:
    
    Number of entries currently in cache: may be approximate, only to be used for diagnostics, metrics reporting
  - get
```
V get(Object key)
```
    NOTE: key is of type Object only to retain binary backwards-compatibility
    
    Returns:
    
    value associated with key (can return null)
  - put
```
V put(K key,
      V value)
```
  - putIfAbsent
```
V putIfAbsent(K key,
              V value)
```
  - clear
```
void clear()
```
    Method for removing all contents this cache has.

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