private Object getOriginalCallbackArgument() {
    Object result = _callbackArgument;
    while (result instanceof WrappedCallbackArgument) {
      WrappedCallbackArgument wca = (WrappedCallbackArgument) result;
      result = wca.getOriginalCallbackArg();
    }
    return result;
  }
@see HAEventWrapper#fromData(DataInput, DeserializationContext)
@see HAContainerRegion#get(Object)
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/ClientUpdateMessageImpl.java