private synchronized boolean maybeAddToExclusives(Entry<K, V> entry) {
    if (!entry.isOrphan && entry.clientCount == 0) {
      mExclusiveEntries.put(entry.key, entry);
      return true;
    }
    return false;
  }
Adds the entry to the exclusively owned queue if it is viable for eviction.
imagepipeline-base/src/main/java/com/facebook/imagepipeline/cache/LruCountingMemoryCache.java