docs: protected Supplier<DataSource<IMAGE>> getDataSourceSupplierForRequest(
        final DraweeController controller,
        final String controllerId,
        final REQUEST imageRequest,
        final CacheLevel cacheLevel) {
      final Object callerContext = getCallerContext();
      return new Supplier<DataSource<IMAGE>>() {
        @Override
        public DataSource<IMAGE> get() {
          return getDataSourceForRequest(
              controller, controllerId, imageRequest, callerContext, cacheLevel);
        }
  
        @Override
        public String toString() {
          return Objects.toStringHelper(this).add("request", imageRequest.toString()).toString();
        }
      };
    }