@Override
  public synchronized @Nullable V inspect(final K key) {
    Entry<K, V> entry = mCachedEntries.get(key);
    if (entry == null) {
      return null;
    }
    return entry.valueRef.get();
  }
Gets the item with the given key, or null if there is no such item.

<p>It is the caller's responsibility to close the returned reference once not needed anymore.
imagepipeline-base/src/main/java/com/facebook/imagepipeline/cache/LruCountingMemoryCache.java