@Override
  public synchronized @Nullable String getDebugData() {
    return Objects.toStringHelper("CountingMemoryCache")
        .add("cached_entries_count", mCachedEntries.getCount())
        .add("cached_entries_size_bytes", mCachedEntries.getSizeInBytes())
        .add("exclusive_entries_count", mExclusiveEntries.getCount())
        .add("exclusive_entries_size_bytes", mExclusiveEntries.getSizeInBytes())
        .toString();
  }
Gets the total size in bytes of the exclusively owned items.
imagepipeline-base/src/main/java/com/facebook/imagepipeline/cache/LruCountingMemoryCache.java