code: public static EventHandlerWrapper wrapEventHandler(@NonNull String type, String producer, @NonNull Object subscriber,
              String action) {
          return new EventHandlerWrapper(type, producer, subscriber, action);
      }
docs: See {@link EventHandlerWrapper}
  @param type The event type subcriber is interested.
  @param producer The event source id subscriber is interested.
  @param subscriber Original subscriber object.
  @param action The name of callback method with parameter 'TangramOp1'. If empty, the subscribe must provide a handler method named 'execute'. See {@link ReflectedActionFinder}
  @return An EventHandlerWrapper wrapping a subscriber and used to registered into event bus.