assertEquals("maximumSize", a.maximumSize, b.maximumSize);
    assertEquals("maximumWeight", a.maximumWeight, b.maximumWeight);
    assertEquals("refreshNanos", a.refreshNanos, b.refreshNanos);
    assertEquals("keyEquivalence", a.keyEquivalence, b.keyEquivalence);
    assertEquals("keyStrength", a.keyStrength, b.keyStrength);
    assertEquals("removalListener", a.removalListener, b.removalListener);

    assertEquals("maximumSize", a.maximumSize, b.maximumSize);
    assertEquals("maximumWeight", a.maximumWeight, b.maximumWeight);
    assertEquals("refreshNanos", a.refreshNanos, b.refreshNanos);
    assertEquals("keyEquivalence", a.keyEquivalence, b.keyEquivalence);
    assertEquals("keyStrength", a.keyStrength, b.keyStrength);
    assertEquals("removalListener", a.removalListener, b.removalListener);

    checkNotNull(unit);
    checkState(refreshNanos == UNSET_INT, "refresh was already set to %s ns", refreshNanos);
    checkArgument(duration > 0, "duration must be positive: %s %s", duration, unit);
    this.refreshNanos = unit.toNanos(duration);
    return this;
  }

  @SuppressWarnings("GoodTime") // nanos internally, should be Duration
  long getRefreshNanos() {

    checkNotNull(unit);
    checkState(refreshNanos == UNSET_INT, "refresh was already set to %s ns", refreshNanos);
    checkArgument(duration > 0, "duration must be positive: %s %s", duration, unit);
    this.refreshNanos = unit.toNanos(duration);
    return this;
  }

  @SuppressWarnings("GoodTime") // nanos internally, should be Duration
  long getRefreshNanos() {

    assertEquals(localCacheOne.expireAfterAccessNanos, localCacheTwo.expireAfterAccessNanos);
    assertEquals(localCacheOne.expireAfterWriteNanos, localCacheTwo.expireAfterWriteNanos);
    assertEquals(localCacheOne.refreshNanos, localCacheTwo.refreshNanos);
    assertEquals(localCacheOne.removalListener, localCacheTwo.removalListener);
    assertEquals(localCacheOne.ticker, localCacheTwo.ticker);

    assertEquals(localCacheOne.expireAfterAccessNanos, localCacheTwo.expireAfterAccessNanos);
    assertEquals(localCacheOne.expireAfterWriteNanos, localCacheTwo.expireAfterWriteNanos);
    assertEquals(localCacheOne.refreshNanos, localCacheTwo.refreshNanos);
    assertEquals(localCacheOne.removalListener, localCacheTwo.removalListener);
    assertEquals(localCacheOne.ticker, localCacheTwo.ticker);

  /** How long after the last write to an entry the map will retain that entry. */
  final long expireAfterWriteNanos;

  /** How long after the last write an entry becomes a candidate for refresh. */
  final long refreshNanos;

  /** Entries waiting to be consumed by the removal listener. */
  // TODO(fry): define a new type which creates event objects and automates the clear logic