Class LocalCache.LocalLoadingCache<K,V>
- All Implemented Interfaces:
Function<K,,V> Cache<K,,V> LoadingCache<K,,V> Serializable,Function<K,V>
- Enclosing class:
- LocalCache<K,
V>
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Field Summary
FieldsFields inherited from class com.google.common.cache.LocalCache.LocalManualCache
localCache -
Constructor Summary
ConstructorsConstructorDescriptionLocalLoadingCache(CacheBuilder<? super K, ? super V> builder, CacheLoader<? super K, V> loader) -
Method Summary
Modifier and TypeMethodDescriptionfinal VReturns the value associated withkeyin this cache, first loading that value if necessary.Returns a map of the values associated withkeys, creating or retrieving those values if necessary.getUnchecked(K key) Returns the value associated withkeyin this cache, first loading that value if necessary.voidLoads a new value forkey, possibly asynchronously.(package private) ObjectMethods inherited from class com.google.common.cache.LocalCache.LocalManualCache
asMap, cleanUp, get, getAllPresent, getIfPresent, invalidate, invalidateAll, invalidateAll, put, putAll, size, statsMethods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitMethods inherited from interface com.google.common.cache.Cache
cleanUp, get, getAllPresent, getIfPresent, invalidate, invalidateAll, invalidateAll, put, putAll, size, statsMethods inherited from interface com.google.common.cache.LoadingCache
asMap
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Field Details
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serialVersionUID
private static final long serialVersionUID- See Also:
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Constructor Details
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LocalLoadingCache
LocalLoadingCache(CacheBuilder<? super K, ? super V> builder, CacheLoader<? super K, V> loader)
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Method Details
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get
Description copied from interface:LoadingCacheReturns the value associated withkeyin this cache, first loading that value if necessary. No observable state associated with this cache is modified until loading completes.If another call to
LoadingCache.get(K)orLoadingCache.getUnchecked(K)is currently loading the value forkey, simply waits for that thread to finish and returns its loaded value. Note that multiple threads can concurrently load values for distinct keys.Caches loaded by a
CacheLoaderwill callCacheLoader.load(K)to load new values into the cache. Newly loaded values are added to the cache usingCache.asMap().putIfAbsentafter loading has completed; if another value was associated withkeywhile the new value was loading then a removal notification will be sent for the new value.If the cache loader associated with this cache is known not to throw checked exceptions, then prefer
LoadingCache.getUnchecked(K)over this method.- Specified by:
getin interfaceLoadingCache<K,V> - Throws:
ExecutionException- if a checked exception was thrown while loading the value. (ExecutionExceptionis thrown even if computation was interrupted by anInterruptedException.)
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getUnchecked
Description copied from interface:LoadingCacheReturns the value associated withkeyin this cache, first loading that value if necessary. No observable state associated with this cache is modified until loading completes. UnlikeLoadingCache.get(K), this method does not throw a checked exception, and thus should only be used in situations where checked exceptions are not thrown by the cache loader.If another call to
LoadingCache.get(K)orLoadingCache.getUnchecked(K)is currently loading the value forkey, simply waits for that thread to finish and returns its loaded value. Note that multiple threads can concurrently load values for distinct keys.Caches loaded by a
CacheLoaderwill callCacheLoader.load(K)to load new values into the cache. Newly loaded values are added to the cache usingCache.asMap().putIfAbsentafter loading has completed; if another value was associated withkeywhile the new value was loading then a removal notification will be sent for the new value.Warning: this method silently converts checked exceptions to unchecked exceptions, and should not be used with cache loaders which throw checked exceptions. In such cases use
LoadingCache.get(K)instead.- Specified by:
getUncheckedin interfaceLoadingCache<K,V>
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getAll
Description copied from interface:LoadingCacheReturns a map of the values associated withkeys, creating or retrieving those values if necessary. The returned map contains entries that were already cached, combined with newly loaded entries; it will never contain null keys or values.Caches loaded by a
CacheLoaderwill issue a single request toCacheLoader.loadAll(java.lang.Iterable<? extends K>)for all keys which are not already present in the cache. All entries returned byCacheLoader.loadAll(java.lang.Iterable<? extends K>)will be stored in the cache, over-writing any previously cached values. This method will throw an exception ifCacheLoader.loadAll(java.lang.Iterable<? extends K>)returnsnull, returns a map containing null keys or values, or fails to return an entry for each requested key.Note that duplicate elements in
keys, as determined byObject.equals(java.lang.Object), will be ignored.- Specified by:
getAllin interfaceLoadingCache<K,V> - Throws:
ExecutionException- if a checked exception was thrown while loading the value. (ExecutionExceptionis thrown even if computation was interrupted by anInterruptedException.)
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refresh
Description copied from interface:LoadingCacheLoads a new value forkey, possibly asynchronously. While the new value is loading the previous value (if any) will continue to be returned byget(key)unless it is evicted. If the new value is loaded successfully it will replace the previous value in the cache; if an exception is thrown while refreshing the previous value will remain, and the exception will be logged (usingLogger) and swallowed.Caches loaded by a
CacheLoaderwill callCacheLoader.reload(K, V)if the cache currently contains a value forkey, andCacheLoader.load(K)otherwise. Loading is asynchronous only ifCacheLoader.reload(K, V)was overridden with an asynchronous implementation.Returns without doing anything if another thread is currently loading the value for
key. If the cache loader associated with this cache performs refresh asynchronously then this method may return before refresh completes.- Specified by:
refreshin interfaceLoadingCache<K,V>
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apply
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writeReplace
Object writeReplace()- Overrides:
writeReplacein classLocalCache.LocalManualCache<K,V>
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