@Nullable
  DirectBufferWrapper getPageFromCache(long page) {
    DirectBufferWrapper buffer;

    buffer = fromCache(myLastBuffer, page);
    if (buffer != null) return buffer;

    buffer = fromCache(myLastBuffer2, page);
    if (buffer != null) return buffer;

    buffer = fromCache(myLastBuffer3, page);
    return buffer;
  }
@Nullable
  DirectBufferWrapper getPageFromCache(long page)