@Override
  public Configuration getConf() {
    return this.conf;
  }
This abstract class needs to be extended to  provide implementation of actions that need
to be performed when a function ends. These methods are called whenever a function ends.

It also provides a way to add fb303 counters through the exportCounters method.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/MetaStoreEndFunctionListener.java