@Override
  protected void appendToEvictionList(EvictionList evictionList) {
    if (evictionList != null) {
      evictionList.appendEntry(this);
    }
  }
Abstract implementation class of RegionEntry interface. This adds LRU support behaviour

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