com.google.common.cache

## Class CacheBuilderSpec

- java.lang.Object
- - com.google.common.cache.CacheBuilderSpec

-     public final class CacheBuilderSpec
      extends java.lang.Object

  A specification of a `CacheBuilder` configuration.

  `CacheBuilderSpec` supports parsing configuration off of a string, which makes it especially useful for command-line configuration of a `CacheBuilder`.

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

  - `concurrencyLevel=[integer]`: sets `CacheBuilder.concurrencyLevel`.
  - `initialCapacity=[integer]`: sets `CacheBuilder.initialCapacity`.
  - `maximumSize=[long]`: sets `CacheBuilder.maximumSize`.
  - `maximumWeight=[long]`: sets `CacheBuilder.maximumWeight`.
  - `expireAfterAccess=[duration]`: sets `CacheBuilder.expireAfterAccess(long, java.util.concurrent.TimeUnit)`.
  - `expireAfterWrite=[duration]`: sets `CacheBuilder.expireAfterWrite(long, java.util.concurrent.TimeUnit)`.
  - `refreshAfterWrite=[duration]`: sets `CacheBuilder.refreshAfterWrite(long, java.util.concurrent.TimeUnit)`.
  - `weakKeys`: sets `CacheBuilder.weakKeys()`.
  - `softValues`: sets `CacheBuilder.softValues()`.
  - `weakValues`: sets `CacheBuilder.weakValues()`.
  - `recordStats`: sets `CacheBuilder.recordStats()`.

  The set of supported keys will grow as `CacheBuilder` evolves, but existing keys will never be removed.

  Durations are represented by an integer, followed by one of "d", "h", "m", or "s", representing days, hours, minutes, or seconds respectively. (There is currently no syntax to request expiration 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`
  - `softValues` and `weakValues`

  `CacheBuilderSpec` does not support configuring `CacheBuilder` methods with non-value parameters. These must be configured in code.

  A new `CacheBuilder` can be instantiated from a `CacheBuilderSpec` using `CacheBuilder.from(CacheBuilderSpec)` or `CacheBuilder.from(String)`.

  Since:
    12.0

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static CacheBuilderSpec` | `disableCaching()` Returns a CacheBuilderSpec that will prevent caching.
    `boolean` | `equals(java.lang.Object obj)`
    `int` | `hashCode()`
    `static CacheBuilderSpec` | `parse(java.lang.String cacheBuilderSpecification)` Creates a CacheBuilderSpec from a string.
    `java.lang.String` | `toParsableString()` Returns a string that can be used to parse an equivalent `CacheBuilderSpec`.
    `java.lang.String` | `toString()` Returns a string representation for this CacheBuilderSpec instance.

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Method Detail

    - #### parse

          public static CacheBuilderSpec parse(java.lang.String cacheBuilderSpecification)

      Creates a CacheBuilderSpec from a string.
      Parameters:
        `cacheBuilderSpecification` - the string form

    - #### disableCaching

          public static CacheBuilderSpec disableCaching()

      Returns a CacheBuilderSpec that will prevent caching.

    - #### toParsableString

          public java.lang.String toParsableString()

      Returns a string that can be used to parse an equivalent `CacheBuilderSpec`. The order and form of this representation is not guaranteed, except that reparsing its output will produce a `CacheBuilderSpec` equal to this instance.

    - #### toString

          public java.lang.String toString()

      Returns a string representation for this CacheBuilderSpec instance. The form of this representation is not guaranteed.
      Overrides:
        `toString` in class `java.lang.Object`

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `java.lang.Object`

    - #### equals

          public boolean equals(@Nullable
                       java.lang.Object obj)

      Overrides:
        `equals` in class `java.lang.Object`