code: public DataSource<CloseableReference<CloseableImage>> fetchImageFromBitmapCache(
        ImageRequest imageRequest,
        Object callerContext) {
      return fetchDecodedImage(
          imageRequest,
          callerContext,
          ImageRequest.RequestLevel.BITMAP_MEMORY_CACHE);
    }
docs: Submits a request for bitmap cache lookup.
  
  @param imageRequest the request to submit
  @param callerContext the caller context for image request
  @return a DataSource representing the image