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() {

  /** 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

  /** 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

        .isEqualTo(localCacheOne.expireAfterAccessNanos);
    assertThat(localCacheTwo.expireAfterWriteNanos).isEqualTo(localCacheOne.expireAfterWriteNanos);
    assertThat(localCacheTwo.refreshNanos).isEqualTo(localCacheOne.refreshNanos);
    assertThat(localCacheTwo.removalListener).isEqualTo(localCacheOne.removalListener);
    assertThat(localCacheTwo.ticker).isEqualTo(localCacheOne.ticker);

        .isEqualTo(localCacheOne.expireAfterAccessNanos);
    assertThat(localCacheTwo.expireAfterWriteNanos).isEqualTo(localCacheOne.expireAfterWriteNanos);
    assertThat(localCacheTwo.refreshNanos).isEqualTo(localCacheOne.refreshNanos);
    assertThat(localCacheTwo.removalListener).isEqualTo(localCacheOne.removalListener);
    assertThat(localCacheTwo.ticker).isEqualTo(localCacheOne.ticker);