@Beta public abstract class ForwardingCache<K,V> extends ForwardingObject implements Cache<K,V>
| Modifier and Type | Class and Description |
|---|---|
static class |
ForwardingCache.SimpleForwardingCache<K,V>
A simplified version of
ForwardingCache where subclasses can pass in an already
constructed Cache as the delegete. |
| Modifier | Constructor and Description |
|---|---|
protected |
ForwardingCache()
Constructor for use by subclasses.
|
| Modifier and Type | Method and Description |
|---|---|
ConcurrentMap<K,V> |
asMap()
Returns a view of the entries stored in this cache as a thread-safe map.
|
void |
cleanUp()
Performs any pending maintenance operations needed by the cache.
|
protected abstract Cache<K,V> |
delegate()
Returns the backing delegate instance that methods are forwarded to.
|
V |
get(K key,
Callable<? extends V> valueLoader)
Returns the value associated with
key in this cache, obtaining that value from
valueLoader if necessary. |
ImmutableMap<K,V> |
getAllPresent(Iterable<?> keys)
Returns a map of the values associated with
keys in this cache. |
V |
getIfPresent(Object key)
Returns the value associated with
key in this cache, or null if there is no
cached value for key. |
void |
invalidate(Object key)
Discards any cached value for key
key. |
void |
invalidateAll()
Discards all entries in the cache.
|
void |
invalidateAll(Iterable<?> keys)
Discards any cached values for keys
keys. |
void |
put(K key,
V value)
Associates
value with key in this cache. |
void |
putAll(Map<? extends K,? extends V> m)
Copies all of the mappings from the specified map to the cache.
|
long |
size()
Returns the approximate number of entries in this cache.
|
CacheStats |
stats()
Returns a current snapshot of this cache's cumulative statistics.
|
toStringprotected abstract Cache<K,V> delegate()
ForwardingObjectForwardingSet.delegate(). Concrete subclasses override this method to supply
the instance being decorated.delegate in class ForwardingObject@Nullable public V getIfPresent(Object key)
Cachekey in this cache, or null if there is no
cached value for key.getIfPresent in interface Cache<K,V>public V get(K key, Callable<? extends V> valueLoader) throws ExecutionException
Cachekey in this cache, obtaining that value from
valueLoader if necessary. No observable state associated with this cache is modified
until loading completes. This method provides a simple substitute for the conventional
"if cached, return; otherwise create, cache and return" pattern.
Warning: as with CacheLoader.load(K), valueLoader must not return
null; it may either return a non-null value or throw an exception.
get in interface Cache<K,V>ExecutionException - if a checked exception was thrown while loading the valuepublic ImmutableMap<K,V> getAllPresent(Iterable<?> keys)
Cachekeys in this cache. The returned map will
only contain entries which are already present in the cache.getAllPresent in interface Cache<K,V>public void put(K key, V value)
Cachevalue with key in this cache. If the cache previously contained a
value associated with key, the old value is replaced by value.
Prefer Cache.get(Object, Callable) when using the conventional "if cached, return;
otherwise create, cache and return" pattern.
public void putAll(Map<? extends K,? extends V> m)
Cacheput(k, v) on this map once for each mapping from key
k to value v in the specified map. The behavior of this operation is undefined
if the specified map is modified while the operation is in progress.public void invalidate(Object key)
Cachekey.invalidate in interface Cache<K,V>public void invalidateAll(Iterable<?> keys)
Cachekeys.invalidateAll in interface Cache<K,V>public void invalidateAll()
CacheinvalidateAll in interface Cache<K,V>public long size()
Cachepublic CacheStats stats()
Cachepublic ConcurrentMap<K,V> asMap()
CacheCopyright © 2020. All rights reserved.