code: @Override
      protected Client<?> instantiateClient(String persistenceUnit)
      {
          return new DSClient(this, persistenceUnit, externalProperties, kunderaMetadata, reader, timestampGenerator);
      }
docs: /*
  (non-Javadoc)
  
  @see
  com.impetus.kundera.loader.GenericClientFactory#instantiateClient(java
  .lang.String)