Package com.github.benmanes.caffeine.cache

Class CaffeineSpec

java.lang.Object
com.github.benmanes.caffeine.cache.CaffeineSpec
public final class CaffeineSpec extends Object
A specification of a Caffeine builder configuration.

CaffeineSpec supports parsing configuration off of a string, which makes it especially useful for command-line configuration of a Caffeine builder.

The string syntax is a series of comma-separated keys or key-value pairs, each corresponding to a Caffeine builder method.

Durations are represented as either an ISO-8601 string using Duration.parse(CharSequence) or by an integer followed by one of "d", "h", "m", or "s", representing days, hours, minutes, or seconds respectively. There is currently no short syntax to request durations in milliseconds, microseconds, or nanoseconds.

Whitespace before and after commas and equal signs is ignored. Keys may not be repeated; it is also illegal to use the following pairs of keys in a single value:

  • maximumSize and maximumWeight
  • weakValues and softValues

CaffeineSpec does not support configuring Caffeine methods with non-value parameters. These must be configured in code.

A new Caffeine builder can be instantiated from a CaffeineSpec using Caffeine.from(CaffeineSpec) or Caffeine.from(String).

  • Field Details

    • SPLIT_OPTIONS

      static final String SPLIT_OPTIONS
      See Also:

    • SPLIT_KEY_VALUE

      static final String SPLIT_KEY_VALUE
      See Also:

    • specification

      final String specification

    • initialCapacity

      int initialCapacity

    • maximumWeight

      long maximumWeight

    • maximumSize

      long maximumSize

    • recordStats

      boolean recordStats

    • keyStrength

      @Nullable Caffeine.Strength keyStrength

    • valueStrength

      @Nullable Caffeine.Strength valueStrength

    • expireAfterWrite

      @Nullable Duration expireAfterWrite

    • expireAfterAccess

      @Nullable Duration expireAfterAccess

    • refreshAfterWrite

      @Nullable Duration refreshAfterWrite

  • Constructor Details

    • CaffeineSpec

      private CaffeineSpec(String specification)

  • Method Details

    • toBuilder

      Caffeine<Object,Object> toBuilder()
      Returns a Caffeine builder configured according to this specification.
      Returns:
      a builder configured to the specification

    • parse

      public static @NonNull CaffeineSpec parse(@NonNull String specification)
      Creates a CaffeineSpec from a string.
      Parameters:
      specification - the string form
      Returns:
      the parsed specification

    • parseOption

      void parseOption(String option)
      Parses and applies the configuration option.

    • configure

      void configure(String key, @Nullable String value)
      Configures the setting.

    • initialCapacity

      void initialCapacity(String key, @Nullable String value)
      Configures the initial capacity.

    • maximumSize

      void maximumSize(String key, @Nullable String value)
      Configures the maximum size.

    • maximumWeight

      void maximumWeight(String key, @Nullable String value)
      Configures the maximum size.

    • weakKeys

      void weakKeys(@Nullable String value)
      Configures the keys as weak references.

    • valueStrength

      void valueStrength(String key, @Nullable String value, Caffeine.Strength strength)
      Configures the value as weak or soft references.

    • expireAfterAccess

      void expireAfterAccess(String key, @Nullable String value)
      Configures expire after access.

    • expireAfterWrite

      void expireAfterWrite(String key, @Nullable String value)
      Configures expire after write.

    • refreshAfterWrite

      void refreshAfterWrite(String key, @Nullable String value)
      Configures refresh after write.

    • recordStats

      void recordStats(@Nullable String value)
      Configures the value as weak or soft references.

    • parseInt

      static int parseInt(String key, @Nullable String value)
      Returns a parsed int value.

    • parseLong

      static long parseLong(String key, @Nullable String value)
      Returns a parsed long value.

    • parseDuration

      static Duration parseDuration(String key, @Nullable String value)
      Returns a parsed duration value.

    • parseTimeUnit

      static TimeUnit parseTimeUnit(String key, @Nullable String value)
      Returns a parsed TimeUnit value.

    • equals

      public boolean equals(Object o)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • toParsableString

      public String toParsableString()
      Returns a string that can be used to parse an equivalent CaffeineSpec. The order and form of this representation is not guaranteed, except that parsing its output will produce a CaffeineSpec equal to this instance.
      Returns:
      a string representation of this specification

    • toString

      public String toString()
      Returns a string representation for this CaffeineSpec instance. The form of this representation is not guaranteed.
      Overrides:
      toString in class Object