@Override public DiskRangeList getFileData(Object fileKey, DiskRangeList range, long baseOffset,
        DiskRangeListFactory factory, BooleanRef gotAllData) {
      return cache.getFileData(fileKey, range, baseOffset, factory, null, gotAllData);
    }
Class for collecting some mocked classes.
E.g: DataCache, Allocator.BufferObjectFactory, DiskRangeListFactory
llap-server/src/test/org/apache/hadoop/hive/llap/io/LlapIoMocks.java