@Override
  public void fromData(DataInput in) throws IOException, ClassNotFoundException {
    Map map = DataSerializer.readHashMap(in);
    if (map != null) {
      for (Object o : map.entrySet()) {
        Map.Entry entry = (Map.Entry) o;
        props.put(entry.getKey(), entry.getValue());
      }
    }
  }
Get the function identifier, used by clients to invoke this function

@return an object identifying this function
@since GemFire 5.8Beta
geode-dunit/src/main/java/org/apache/geode/internal/cache/functions/TestFunction.java