javax.cache.integration

Interface CacheLoader<K,V>

Type Parameters:

K - the type of keys handled by this loader

V - the type of values generated by this loader

public interface CacheLoader<K,V>

Used when a cache is read-through or when loading data into a cache via the Cache.loadAll(java.util.Set, boolean, CompletionListener) method.

Since:

1.0

Author:

Greg Luck, Yannis Cosmadopoulos

See Also:

Configuration.isReadThrough(), CacheWriter

Method Summary

Methods

Modifier and Type	Method and Description
V	load(K key) Loads an object.
Map<K,V>	loadAll(Iterable<? extends K> keys) Loads multiple objects.

Method Detail

load

V load(K key)
       throws CacheLoaderException

Loads an object. Application developers should implement this method to customize the loading of a value for a cache entry. This method is called by a cache when a requested entry is not in the cache. If the object can't be loaded null should be returned.

Parameters:

key - the key identifying the object being loaded

Returns:

The value for the entry that is to be stored in the cache or null if the object can't be loaded

Throws:

CacheLoaderException - if there is problem executing the loader.

loadAll

Map<K,V> loadAll(Iterable<? extends K> keys)
                 throws CacheLoaderException

Loads multiple objects. Application developers should implement this method to customize the loading of cache entries. This method is called when the requested object is not in the cache. If an object can't be loaded, it is not returned in the resulting map.

Parameters:

keys - keys identifying the values to be loaded

Returns:

A map of key, values to be stored in the cache.

Throws:

CacheLoaderException - if there is problem executing the loader.