Module com.github.benmanes.caffeine
Package com.github.benmanes.caffeine.cache

Interface Policy.VarExpiration<K,​V>

  • Enclosing interface:
    Policy<K,​V>
    public static interface Policy.VarExpiration<K,​V>
    The low-level operations for a cache with a variable expiration policy.

    • Method Summary

      All Methods Instance Methods Abstract Methods Default Methods 
      Modifier and Type Method Description
      default Optional<Duration> getExpiresAfter​(K key)
      Returns the duration until the entry should be automatically removed.
      OptionalLong getExpiresAfter​(K key, TimeUnit unit)
      Returns the duration until the entry should be automatically removed.
      Map<K,​V> oldest​(@org.checkerframework.checker.index.qual.NonNegative int limit)
      Returns an unmodifiable snapshot Map view of the cache with ordered traversal.
      @Nullable V put​(K key, V value, @org.checkerframework.checker.index.qual.NonNegative long duration, TimeUnit unit)
      Associates the value with the key in this cache.
      default @Nullable V put​(K key, V value, Duration duration)
      Associates the value with the key in this cache.
      @Nullable V putIfAbsent​(K key, V value, @org.checkerframework.checker.index.qual.NonNegative long duration, TimeUnit unit)
      Associates the value with the key in this cache if the specified key is not already associated with a value.
      default @Nullable V putIfAbsent​(K key, V value, Duration duration)
      Associates the value with the key in this cache if the specified key is not already associated with a value.
      void setExpiresAfter​(K key, @org.checkerframework.checker.index.qual.NonNegative long duration, TimeUnit unit)
      Specifies that the entry should be automatically removed from the cache once the duration has elapsed.
      default void setExpiresAfter​(K key, Duration duration)
      Specifies that the entry should be automatically removed from the cache once the duration has elapsed.
      Map<K,​V> youngest​(@org.checkerframework.checker.index.qual.NonNegative int limit)
      Returns an unmodifiable snapshot Map view of the cache with ordered traversal.

    • Method Detail

      • getExpiresAfter

        OptionalLong getExpiresAfter​(K key,
                             TimeUnit unit)
        Returns the duration until the entry should be automatically removed. The expiration policy determines when the entry's duration is reset.
        Parameters:
        key - the key for the entry being queried
        unit - the unit that age is expressed in
        Returns:
        the duration if the entry is present in the cache

      • getExpiresAfter

        default Optional<Duration> getExpiresAfter​(K key)
        Returns the duration until the entry should be automatically removed. The expiration policy determines when the entry's duration is reset.
        Parameters:
        key - the key for the entry being queried
        Returns:
        the duration if the entry is present in the cache

      • setExpiresAfter

        void setExpiresAfter​(K key,
                     @org.checkerframework.checker.index.qual.NonNegative long duration,
                     TimeUnit unit)
        Specifies that the entry should be automatically removed from the cache once the duration has elapsed. The expiration policy determines when the entry's age is reset.
        Parameters:
        key - the key for the entry being set
        duration - the length of time from now when the entry should be automatically removed
        unit - the unit that duration is expressed in
        Throws:
        IllegalArgumentException - if duration is negative
        NullPointerException - if the unit is null

      • setExpiresAfter

        default void setExpiresAfter​(K key,
                             Duration duration)
        Specifies that the entry should be automatically removed from the cache once the duration has elapsed. The expiration policy determines when the entry's age is reset.
        Parameters:
        key - the key for the entry being set
        duration - the length of time from now when the entry should be automatically removed
        Throws:
        IllegalArgumentException - if duration is negative

      • putIfAbsent

        @Nullable V putIfAbsent​(K key,
                        V value,
                        @org.checkerframework.checker.index.qual.NonNegative long duration,
                        TimeUnit unit)
        Associates the value with the key in this cache if the specified key is not already associated with a value. This method differs from Map.putIfAbsent(K, V) by substituting the configured Expiry with the specified write duration, has no effect on the duration if the entry was present, and returns the success rather than a value.
        Parameters:
        key - the key with which the specified value is to be associated
        value - value to be associated with the specified key
        duration - the length of time from now when the entry should be automatically removed
        unit - the unit that duration is expressed in
        Returns:
        the previous value associated with the specified key, or null if there was no mapping for the key.
        Throws:
        IllegalArgumentException - if duration is negative

      • putIfAbsent

        default @Nullable V putIfAbsent​(K key,
                                V value,
                                Duration duration)
        Associates the value with the key in this cache if the specified key is not already associated with a value. This method differs from Map.putIfAbsent(K, V) by substituting the configured Expiry with the specified write duration, has no effect on the duration if the entry was present, and returns the success rather than a value.
        Parameters:
        key - the key with which the specified value is to be associated
        value - value to be associated with the specified key
        duration - the length of time from now when the entry should be automatically removed
        Returns:
        the previous value associated with the specified key, or null if there was no mapping for the key.
        Throws:
        IllegalArgumentException - if duration is negative

      • put

        @Nullable V put​(K key,
                V value,
                @org.checkerframework.checker.index.qual.NonNegative long duration,
                TimeUnit unit)
        Associates the value with the key in this cache. If the cache previously contained a value associated with the key, the old value is replaced by the new value. This method differs from Cache.put(K, V) by substituting the configured Expiry with the specified write duration.
        Parameters:
        key - the key with which the specified value is to be associated
        value - value to be associated with the specified key
        duration - the length of time from now when the entry should be automatically removed
        unit - the unit that duration is expressed in
        Returns:
        the previous value associated with key, or null if there was no mapping for key.
        Throws:
        IllegalArgumentException - if duration is negative
        NullPointerException - if the specified key or value is null

      • put

        default @Nullable V put​(K key,
                        V value,
                        Duration duration)
        Associates the value with the key in this cache. If the cache previously contained a value associated with the key, the old value is replaced by the new value. This method differs from Cache.put(K, V) by substituting the configured Expiry with the specified write duration.
        Parameters:
        key - the key with which the specified value is to be associated
        value - value to be associated with the specified key
        duration - the length of time from now when the entry should be automatically removed
        Returns:
        the previous value associated with key, or null if there was no mapping for key.
        Throws:
        IllegalArgumentException - if duration is negative
        NullPointerException - if the specified key or value is null

      • oldest

        Map<K,​V> oldest​(@org.checkerframework.checker.index.qual.NonNegative int limit)
        Returns an unmodifiable snapshot Map view of the cache with ordered traversal. The order of iteration is from the entries most likely to expire (oldest) to the entries least likely to expire (youngest). This order is determined by the expiration policy's best guess at the time of creating this snapshot view.

        Beware that obtaining the mappings is NOT a constant-time operation. Because of the asynchronous nature of the page replacement policy, determining the retention ordering requires a traversal of the entries.

        Parameters:
        limit - the maximum size of the returned map (use Integer.MAX_VALUE to disregard the limit)
        Returns:
        a snapshot view of the cache from oldest entry to the youngest

      • youngest

        Map<K,​V> youngest​(@org.checkerframework.checker.index.qual.NonNegative int limit)
        Returns an unmodifiable snapshot Map view of the cache with ordered traversal. The order of iteration is from the entries least likely to expire (youngest) to the entries most likely to expire (oldest). This order is determined by the expiration policy's best guess at the time of creating this snapshot view.

        Beware that obtaining the mappings is NOT a constant-time operation. Because of the asynchronous nature of the page replacement policy, determining the retention ordering requires a traversal of the entries.

        Parameters:
        limit - the maximum size of the returned map (use Integer.MAX_VALUE to disregard the limit)
        Returns:
        a snapshot view of the cache from youngest entry to the oldest