@Override
public String getTheme(UICreateEvent event) {
    // get theme from cookies before app ui initialized for smooth theme enabling
    WebConfig webConfig = configuration.getConfig(WebConfig.class);
    GlobalConfig globalConfig = configuration.getConfig(GlobalConfig.class);

    String appWindowTheme = webConfig.getAppWindowTheme();
    String userAppTheme = getCookieValue(event.getRequest().getCookies(),
            App.APP_THEME_COOKIE_PREFIX + globalConfig.getWebContextName());
    if (userAppTheme != null) {
        if (!Objects.equals(userAppTheme, appWindowTheme)) {
            // check theme support
            ThemeConstantsRepository themeRepository = AppBeans.get(ThemeConstantsRepository.NAME);
            Set<String> supportedThemes = themeRepository.getAvailableThemes();
            if (supportedThemes.contains(userAppTheme)) {

                return userAppTheme;
            }
        }
    }

    return super.getTheme(event);
}
 

@Override
public UI createInstance(final UICreateEvent event) {
	final Class<UIID> key = UIID.class;
	final UIID identifier = new UIID(event);
	CurrentInstance.set(key, identifier);
	try {
		logger.debug("Creating a new UI bean of class [{}] with identifier [{}]",
				event.getUIClass().getCanonicalName(), identifier);
		final UI ui = getWebApplicationContext().getBean(event.getUIClass());

		getSpringViewDisplayRegistrationBean().setBeanClass(event.getUIClass());

		configureNavigator(ui);
		return ui;
	} finally {
		CurrentInstance.set(key, null);
	}
}
 

@Override
public PushMode getPushMode(UICreateEvent event) {
    WebConfig webConfig = configuration.getConfig(WebConfig.class);

    if (!webConfig.getPushEnabled()) {
        return PushMode.DISABLED;
    }

    return super.getPushMode(event);
}
 

@Override
public Transport getPushTransport(UICreateEvent event) {
    WebConfig webConfig = configuration.getConfig(WebConfig.class);

    if (webConfig.getUsePushLongPolling()) {
        return Transport.LONG_POLLING;
    }

    return super.getPushTransport(event);
}
 

@Override
public UI createInstance(UICreateEvent event) {
	ApplicationContext ctx = VaadinUtils.getApplicationContext();
	CurrentInstance.set(UIid.class, new UIid(event.getUiId()));
	UI ui = this.uiMapping.getUi(event.getRequest());
	
	if (ui == null)
		ui =  ctx.getBean(event.getUIClass());
	
	CurrentInstance.set(UIid.class, null);
	
	return ui;
}
 

@Override
public UI createInstance(UICreateEvent event) {
    return AppBeans.getPrototype(AppUI.NAME);
}
 

@Override
public UI createInstance(UICreateEvent event) {
  return IngestServletContextListener.injector().getProvider(uiClass).get();
}