Class LocalCache.LoadingSerializationProxy<K,V>

All Implemented Interfaces:
Function<K,V>, Cache<K,V>, LoadingCache<K,V>, Serializable, Function<K,V>
Enclosing class:
LocalCache<K,V>

static final class LocalCache.LoadingSerializationProxy<K,V> extends LocalCache.ManualSerializationProxy<K,V> implements LoadingCache<K,V>, Serializable
Serializes the configuration of a LocalCache, reconstituting it as an LoadingCache using CacheBuilder upon deserialization. An instance of this class is fit for use by the writeReplace of LocalLoadingCache.

Unfortunately, readResolve() doesn't get called when a circular dependency is present, so the proxy must be able to behave as the cache itself.

  • Field Details

  • Constructor Details

    • LoadingSerializationProxy

      LoadingSerializationProxy(LocalCache<K,V> cache)
  • Method Details

    • readObject

      private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException
      Throws:
      IOException
      ClassNotFoundException
    • get

      public V get(K key) throws ExecutionException
      Description copied from interface: LoadingCache
      Returns the value associated with key in 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) or LoadingCache.getUnchecked(K) is currently loading the value for key, 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 CacheLoader will call CacheLoader.load(K) to load new values into the cache. Newly loaded values are added to the cache using Cache.asMap().putIfAbsent after loading has completed; if another value was associated with key while 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:
      get in interface LoadingCache<K,V>
      Throws:
      ExecutionException - if a checked exception was thrown while loading the value. ( ExecutionException is thrown even if computation was interrupted by an InterruptedException.)
    • getUnchecked

      public V getUnchecked(K key)
      Description copied from interface: LoadingCache
      Returns the value associated with key in this cache, first loading that value if necessary. No observable state associated with this cache is modified until loading completes. Unlike LoadingCache.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) or LoadingCache.getUnchecked(K) is currently loading the value for key, 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 CacheLoader will call CacheLoader.load(K) to load new values into the cache. Newly loaded values are added to the cache using Cache.asMap().putIfAbsent after loading has completed; if another value was associated with key while 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:
      getUnchecked in interface LoadingCache<K,V>
    • getAll

      public ImmutableMap<K,V> getAll(Iterable<? extends K> keys) throws ExecutionException
      Description copied from interface: LoadingCache
      Returns a map of the values associated with keys, 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 CacheLoader will issue a single request to CacheLoader.loadAll(java.lang.Iterable<? extends K>) for all keys which are not already present in the cache. All entries returned by CacheLoader.loadAll(java.lang.Iterable<? extends K>) will be stored in the cache, over-writing any previously cached values. This method will throw an exception if CacheLoader.loadAll(java.lang.Iterable<? extends K>) returns null, 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 by Object.equals(java.lang.Object), will be ignored.

      Specified by:
      getAll in interface LoadingCache<K,V>
      Throws:
      ExecutionException - if a checked exception was thrown while loading the value. ( ExecutionException is thrown even if computation was interrupted by an InterruptedException.)
    • apply

      public V apply(K key)
      Specified by:
      apply in interface Function<K,V>
      Specified by:
      apply in interface Function<K,V>
      Specified by:
      apply in interface LoadingCache<K,V>
    • refresh

      public void refresh(K key)
      Description copied from interface: LoadingCache
      Loads a new value for key, possibly asynchronously. While the new value is loading the previous value (if any) will continue to be returned by get(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 (using Logger) and swallowed.

      Caches loaded by a CacheLoader will call CacheLoader.reload(K, V) if the cache currently contains a value for key, and CacheLoader.load(K) otherwise. Loading is asynchronous only if CacheLoader.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:
      refresh in interface LoadingCache<K,V>
    • readResolve

      private Object readResolve()