org.apache.reef.util.cache

Interface Cache<K,V>

All Known Implementing Classes:

CacheImpl, NameCache

public interface Cache<K,V>

Cache with get-if-absent-compute semantics. Supports explicit invalidation. Implementation may add other features, e.g. eviction on expire-after-write

Method Summary

Modifier and Type	Method and Description
V	get(K key, Callable<V> valueFetcher) Returns a value for the key if cached; otherwise creates, caches and returns.
void	invalidate(K key) Invalidates a key from the cache.

Method Detail

get

V get(K key,
      Callable<V> valueFetcher)
throws ExecutionException

Returns a value for the key if cached; otherwise creates, caches and returns. When it creates a value for a key, only one callable for the key is executed

Parameters:

key - a key

valueFetcher - a value fetcher

Returns:

a value

Throws:

ExecutionException

invalidate

void invalidate(K key)

Invalidates a key from the cache.

Parameters:

key - a key