protected Supplier<DataSource<IMAGE>> getDataSourceSupplierForRequest(
      final DraweeController controller, String controllerId, REQUEST imageRequest) {
    return getDataSourceSupplierForRequest(
        controller, controllerId, imageRequest, CacheLevel.FULL_FETCH);
  }
Creates a data source supplier for the given image request.
drawee/src/main/java/com/facebook/drawee/controller/AbstractDraweeControllerBuilder.java