code: public static JsMessageHandleFactory getJsMessageHandleFactory() {
          if (TraceComponent.isAnyTracingEnabled()
              && tc.isEntryEnabled())
              SibTr.entry(tc, "getJsMessageHandleFactory");
  
          if (_jsMessageHandleFactory == null)
              _jsMessageHandleFactory = (JsMessageHandleFactory) getSingletonInstance(SIMPConstants.JS_MESSAGE_HANDLE_FACTORY);
  
          if (TraceComponent.isAnyTracingEnabled()
              && tc.isEntryEnabled())
              SibTr.exit(tc, "getJsMessageHandleFactory", _jsMessageHandleFactory);
          return _jsMessageHandleFactory;
      }
docs: Creates the message handle factory single instance
  
  @return the single instance of the message handle factory.