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com.github.benmanes.caffeine.cache

public Interface Policy<K, V>

Known Direct Implementers: com.github.benmanes.caffeine.cache.UnboundedLocalCache.UnboundedPolicy, com.github.benmanes.caffeine.cache.BoundedLocalCache.BoundedPolicy
Static Imports: com.github.benmanes.caffeine.cache.Caffeine.saturatedToNanos

An access point for inspecting and performing low-level operations based on the cache's runtime characteristics. These operations are optional and dependent on how the cache was constructed and what abilities the implementation exposes.

Author: [email protected] (Ben Manes)

Nested and Inner Type Summary

Modifier and Type	Class and Description
public static interface	Policy.CacheEntry<K, V> A key-value pair that may include policy metadata for the cached entry.
public static interface	Policy.Eviction<K, V> The low-level operations for a cache with a size-based eviction policy.
public static interface	Policy.FixedExpiration<K, V> The low-level operations for a cache with a fixed expiration policy.
public static interface	Policy.FixedRefresh<K, V> The low-level operations for a cache with a fixed refresh policy.
public static interface	Policy.VarExpiration<K, V> The low-level operations for a cache with a variable expiration policy.

Method Summary

Modifier and Type	Method and Description
public Optional<Policy.Eviction<K, V>>	Returns: access to low-level operations for this cache if an eviction policy is used eviction() Returns access to perform operations based on the maximum size or maximum weight eviction policy.
public Optional<Policy.FixedExpiration<K, V>>	Returns: access to low-level operations for this cache if a time-to-idle expiration policy is used expireAfterAccess() Returns access to perform operations based on the time-to-idle expiration policy.
public Optional<Policy.FixedExpiration<K, V>>	Returns: access to low-level operations for this cache if a time-to-live expiration policy is used expireAfterWrite() Returns access to perform operations based on the time-to-live expiration policy.
public Optional<Policy.VarExpiration<K, V>>	Returns: access to low-level operations for this cache if a variable expiration policy is used expireVariably() Returns access to perform operations based on the variable expiration policy.
public default @Nullable Policy.CacheEntry<K, V>	Returns: the entry mapping for the specified key, or `null` if this cache contains no mapping for the key getEntryIfPresentQuietly(K the key whose associated value is to be returned key) Returns the cache entry associated with the `key` in this cache, or `null` if there is no cached value for the `key`.
public @Nullable V	Returns: the value to which the specified key is mapped, or `null` if this cache contains no mapping for the key getIfPresentQuietly(K the key whose associated value is to be returned key) Returns the value associated with the `key` in this cache, or `null` if there is no cached value for the `key`.
public boolean	Returns: if cache statistics are being recorded isRecordingStats() Returns whether the cache statistics are being accumulated.
public Optional<Policy.FixedRefresh<K, V>>	Returns: access to low-level operations for this cache if a time-to-live refresh policy is used refreshAfterWrite() Returns access to perform operations based on the time-to-live refresh policy.
public Map<K, CompletableFuture<V>>	Returns: a snapshot view of the in-flight refresh operations refreshes() Returns an unmodifiable snapshot `Map` view of the in-flight refresh operations.