Package com.google.common.cache

Interface RemovalListener<K,​V>

  • Type Parameters:
    K - the most general type of keys this listener can listen for; for example Object if any key is acceptable
    V - the most general type of values this listener can listen for; for example Object if any key is acceptable
    Functional Interface:
    This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
    @GwtCompatible
@FunctionalInterface
public interface RemovalListener<K,​V>
    An object that can receive a notification when an entry is removed from a cache. The removal resulting in notification could have occurred to an entry being manually removed or replaced, or due to eviction resulting from timed expiration, exceeding a maximum size, or garbage collection.

    An instance may be called concurrently by multiple threads to process different entries. Implementations of this interface should avoid performing blocking calls or synchronizing on shared resources.

    Since:
    10.0
    Author:
    Charles Fry

    • Method Detail

      • onRemoval

        void onRemoval​(RemovalNotification<K,​V> notification)
        Notifies the listener that a removal occurred at some point in the past.

        This does not always signify that the key is now absent from the cache, as it may have already been re-added.