refactor: DispatcherServlet 에 어노테이션 기반 핸들러 적용

app/src/main/java/com/techcourse/DispatcherServlet.java

@@ -6,22 +6,32 @@
 import jakarta.servlet.http.HttpServletResponse;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import webmvc.org.springframework.web.servlet.view.JspView;
+import webmvc.org.springframework.web.servlet.ModelAndView;
+import webmvc.org.springframework.web.servlet.mvc.HandlerAdapter;
+import webmvc.org.springframework.web.servlet.mvc.asis.ControllerHandlerAdapter;
+import webmvc.org.springframework.web.servlet.mvc.tobe.AnnotationHandlerMapping;
+import webmvc.org.springframework.web.servlet.mvc.tobe.HandlerExecutionHandlerAdapter;
 
 public class DispatcherServlet extends HttpServlet {
 
     private static final long serialVersionUID = 1L;
     private static final Logger log = LoggerFactory.getLogger(DispatcherServlet.class);
 
-    private ManualHandlerMapping manualHandlerMapping;
+    private HandlerMappingRegistry handlerMappingRegistry;
+    private HandlerAdapterRegistry handlerAdapterRegistry;
 
     public DispatcherServlet() {
     }
 
     @Override
     public void init() {
-        manualHandlerMapping = new ManualHandlerMapping();
-        manualHandlerMapping.initialize();
+        handlerMappingRegistry
+                .addHandlerMapping(new ManualHandlerMapping())
+                .addHandlerMapping(new AnnotationHandlerMapping());
+        handlerAdapterRegistry
+                .addHandlerAdapter(new ControllerHandlerAdapter())
+                .addHandlerAdapter(new HandlerExecutionHandlerAdapter());
+        handlerMappingRegistry.initialize();
     }
 
     @Override
@@ -30,22 +40,19 @@ protected void service(final HttpServletRequest request, final HttpServletRespon
         log.debug("Method : {}, Request URI : {}", request.getMethod(), requestURI);
 
         try {
-            final var controller = manualHandlerMapping.getHandler(requestURI);
-            final var viewName = controller.execute(request, response);
-            move(viewName, request, response);
+            Object handler = handlerMappingRegistry.getHandler(request)
+                    .orElseThrow(() -> new IllegalArgumentException("There is not matched handler"));
+            HandlerAdapter handlerAdapter = handlerAdapterRegistry.getHandlerAdapter(handler)
+                    .orElseThrow(() -> new IllegalArgumentException("Not Supported Handler"));
+            ModelAndView modelAndView = handlerAdapter.handle(request, response, handler);
+            render(modelAndView, request, response);
         } catch (Throwable e) {
             log.error("Exception : {}", e.getMessage(), e);
             throw new ServletException(e.getMessage());
         }
     }
 
-    private void move(final String viewName, final HttpServletRequest request, final HttpServletResponse response) throws Exception {
-        if (viewName.startsWith(JspView.REDIRECT_PREFIX)) {
-            response.sendRedirect(viewName.substring(JspView.REDIRECT_PREFIX.length()));
-            return;
-        }
-
-        final var requestDispatcher = request.getRequestDispatcher(viewName);
-        requestDispatcher.forward(request, response);
+    private void render(ModelAndView modelAndView, HttpServletRequest request, HttpServletResponse response) {
+        // TODO: 3단계?
     }
 }