public void setCallbackArgument(Object newCallbackArgument) {
    if (keyInfo.getCallbackArg() instanceof WrappedCallbackArgument) {
      ((WrappedCallbackArgument) keyInfo.getCallbackArg())
          .setOriginalCallbackArgument(newCallbackArgument);
    } else {
      keyInfo.setCallbackArg(newCallbackArgument);
    }
  }
Sets the value of raw callback argument field.
geode-core/src/main/java/org/apache/geode/internal/cache/EntryEventImpl.java