@Override
  public boolean fillInValue(InternalRegion region, Entry entry, ByteArrayDataInput in,
      DistributionManager mgr, final KnownVersion version) {
    return Helper.fillInValue(this, entry, region.getDiskRegion(), region, version);
  }
Abstract implementation class of RegionEntry interface. This is adds Disk support behavior

@since GemFire 3.5.1
geode-core/src/main/java/org/apache/geode/internal/cache/entries/AbstractOplogDiskRegionEntry.java