HandlerInterceptor
A HandlerInterceptor gets called before the appropriate HandlerAdapter triggers the execution of the handler itself
postHandle
(after handler and before view rendering)
Create NotificationInterceptor class
- View rendering 전에 알림이 있는지에 대한 flag를 Model 에 담아준다
@Component
@RequiredArgsConstructor
public class NotificationInterceptor implements HandlerInterceptor {
private final NotificationRepository notificationRepository;
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
if (modelAndView != null && !isRedirectView(modelAndView) && authentication != null && authentication.getPrincipal() instanceof UserAccount) {
Account account = ((UserAccount)authentication.getPrincipal()).getAccount();
Long count = notificationRepository.countByAccountAndChecked(account, false);
modelAndView.addObject("hasNotification", count > 0);
}
}
private boolean isRedirectView(ModelAndView modelAndView) {
return modelAndView.getViewName().startsWith("redirect:") || modelAndView.getView() instanceof RedirectView;
}
}implements WebMvcConfigurer
- NotificationInterceptor를 등록한다
@Configuration
@RequiredArgsConstructor
public class WebConfig implements WebMvcConfigurer {
private final NotificationInterceptor notificationInterceptor;
@Override
public void addInterceptors(InterceptorRegistry registry) {
List<String> staticResourcesPath = Arrays.stream(StaticResourceLocation.values())
.flatMap(StaticResourceLocation::getPatterns)
.collect(Collectors.toList());
staticResourcesPath.add("/node_modules/**");
registry.addInterceptor(notificationInterceptor)
.excludePathPatterns(staticResourcesPath);
}
}View
- bootstrap if 문법을 사용해 아이콘 색을 변경한다
<i th:if="${!hasNotification}" class="fa fa-bell-o" aria-hidden="true"></i>
<span class="text-info">
<i th:if="${hasNotification}" class="fa fa-bell-o" aria-hidden="true"></i>
</span>