org.ehcache.spi.persistence

Interface StateHolder<K,V>

Type Parameters:

K - type of Keys

V - type of Values

All Known Implementing Classes:

TransientStateHolder

public interface StateHolder<K,V>

A Map like structure that can hold key value mappings.

Method Summary

Modifier and Type	Method and Description
java.util.Set<java.util.Map.Entry<K,V>>	entrySet() Retrieves all the entries in the StateHolder as a Set of Map.Entry instances.
V	get(K key) Retrieves the value mapped to the given key
V	putIfAbsent(K key, V value) If the specified key is not already associated with a value (or is mapped to null) associates it with the given value and returns null, else returns the current value.

Method Detail

putIfAbsent

V putIfAbsent(K key,
              V value)

If the specified key is not already associated with a value (or is mapped to null) associates it with the given value and returns null, else returns the current value.

Parameters:

key - a key

value - a value

Returns:

the previous value associated with the specified key, or null if there was no mapping for the key.

get

V get(K key)

Retrieves the value mapped to the given key

Parameters:

key - a key

Returns:

the value mapped to the key

entrySet

java.util.Set<java.util.Map.Entry<K,V>> entrySet()

Retrieves all the entries in the StateHolder as a Set of Map.Entry instances.

Returns:

the set of this StateHolder mappings