}

  @Throws(IOException::class)
  fun trimToSize() {
    while (size > maxSize) {
      if (!removeOldestEntry()) return
    }
    mostRecentTrimFailed = false
  }

  /** Returns true if an entry was removed. This will return false if all entries are zombies. */
  private fun removeOldestEntry(): Boolean {
    for (toEvict in lruEntries.values) {
      if (!toEvict.zombie) {
        removeEntry(toEvict)

     *
     * @return the upper limit on the number of entries
     */
    public int getLimitSize() {
        return limitSize;
    }

    @Override
    protected boolean removeEldestEntry(final Map.Entry<K, V> entry) {
        return size() > limitSize;
    }

@GwtIncompatible // not worth using in GWT for now
final class CompactLinkedHashMap<K extends @Nullable Object, V extends @Nullable Object>
    extends CompactHashMap<K, V> {
  // TODO(lowasser): implement removeEldestEntry so this can be used as a drop-in replacement

  /** Creates an empty {@code CompactLinkedHashMap} instance. */
  public static <K extends @Nullable Object, V extends @Nullable Object>

@GwtIncompatible // not worth using in GWT for now
final class CompactLinkedHashMap<K extends @Nullable Object, V extends @Nullable Object>
    extends CompactHashMap<K, V> {
  // TODO(lowasser): implement removeEldestEntry so this can be used as a drop-in replacement

  /** Creates an empty {@code CompactLinkedHashMap} instance. */
  public static <K extends @Nullable Object, V extends @Nullable Object>

      this.maximumSize = maximumSize;
      this.statsCounter = statsCounter;
      this.removalListener = removalListener;
    }

    @Override
    protected boolean removeEldestEntry(Entry<K, Timestamped<V>> ignored) {
      boolean removal = (maximumSize == UNSET_INT) ? false : (size() > maximumSize);
      if ((removalListener != null) && removal) {
        removalListener.onRemoval(

    
    public HandleCache() {
        this.lruCache = new LinkedHashMap<String, HandleInfo>(maxHandles, 0.75f, true) {
            @Override
            protected boolean removeEldestEntry(Map.Entry<String, HandleInfo> eldest) {
                if (size() > maxHandles) {
                    // Release least recently used non-persistent handle