@Override
    public String toString() {
      String instatiatorName = (instantiatorClass == null) ? instantiatorClassName
          : instantiatorClass.getName();
      String instatiatedName = (instantiatedClass == null) ? instantiatedClassName
          : instantiatedClass.getName();
      return String.format("Register Instantiator %s of class %s that instantiates a %s", id,
          instatiatorName, instatiatedName);
    }
Creates a new {@code RegistrationMessage} that broadcasts that the given {@code Instantiator}
was registered.
geode-core/src/main/java/org/apache/geode/internal/InternalInstantiator.java