@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 ForwardingCache()
protected 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()
CacheIterators from the returned map are at least weakly consistent: they are safe for concurrent use, but if the cache is modified (including by eviction) after the iterator is created, it is undefined which of the changes (if any) will be reflected in that iterator.
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