@Override public void releaseBuffer(MemoryBuffer buffer) {
      cachePolicy.notifyUnlock((LlapCacheableBuffer) buffer);
    }
Class for collecting some mocked classes.
E.g: DataCache, Allocator.BufferObjectFactory, DiskRangeListFactory
llap-server/src/test/org/apache/hadoop/hive/llap/io/LlapIoMocks.java