Class CacheBuilderSpec

corpus/java/training/guava/cache/CacheBuilderSpec.java:79–483

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 pair

 * @since 12.0
 */
@GwtIncompatible
public final class CacheBuilderSpec {
  /** Parses a single value. */
  private interface ValueParser {
    void parse(CacheBuilderSpec spec, String key, @Nullable String value);
  }

  /** Splits each key-value pair. */
  private static final Splitter KEYS_SPLITTER = Splitter.on(',').trimResults();

  /** Splits the key from the value. */
  private static final Splitter KEY_VALUE_SPLITTER = Splitter.on('=').trimResults();

  /** Map of names to ValueParser. */
  private static final ImmutableMap<String, ValueParser> VALUE_PARSERS =
      ImmutableMap.<String, ValueParser>builder()
          .put("initialCapacity", new InitialCapacityParser())
          .put("maximumSize", new MaximumSizeParser())
          .put("maximumWeight", new MaximumWeightParser())
          .put("concurrencyLevel", new ConcurrencyLevelParser())
          .put("weakKeys", new KeyStrengthParser(Strength.WEAK))
          .put("softValues", new ValueStrengthParser(Strength.SOFT))
          .put("weakValues", new ValueStrengthParser(Strength.WEAK))
          .put("recordStats", new RecordStatsParser())
          .put("expireAfterAccess", new AccessDurationParser())
          .put("expireAfterWrite", new WriteDurationParser())
          .put("refreshAfterWrite", new RefreshDurationParser())
          .put("refreshInterval", new RefreshDurationParser())
          .build();

  @VisibleForTesting Integer initialCapacity;
  @VisibleForTesting Long maximumSize;
  @VisibleForTesting Long maximumWeight;
  @VisibleForTesting Integer concurrencyLevel;
  @VisibleForTesting Strength keyStrength;
  @VisibleForTesting Strength valueStrength;
  @VisibleForTesting Boolean recordStats;
  @VisibleForTesting long writeExpirationDuration;
  @VisibleForTesting TimeUnit writeExpirationTimeUnit;
  @VisibleForTesting long accessExpirationDuration;
  @VisibleForTesting TimeUnit accessExpirationTimeUnit;
  @VisibleForTesting long refreshDuration;
  @VisibleForTesting TimeUnit refreshTimeUnit;
  /** Specification; used for toParseableString(). */
  private final String specification;

  private CacheBuilderSpec(String specification) {
    this.specification = specification;
  }

  /**
   * Creates a CacheBuilderSpec from a string.
   *
   * @param cacheBuilderSpecification the string form
   */
  public static CacheBuilderSpec parse(String cacheBuilderSpecification) {
    CacheBuilderSpec spec = new CacheBuilderSpec(cacheBuilderSpecification);
    if (!cacheBuilderSpecification.isEmpty()) {