code: public RuntimeEventListener getRuntimeEventListener() {
          if (TraceComponent.isAnyTracingEnabled()
              && tc.isEntryEnabled()) {
              SibTr.entry(tc, "getRuntimeEventListener");
              SibTr.exit(tc, "getRuntimeEventListener", _runtimeEventListener);
          }
          return _runtimeEventListener;
      }
docs: Get MessageProcessor's RuntimeEventListener.