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[MVC 구현하기 2단계] 포이(김보준) 미션 제출합니다. (#446)
* feat: 어노테이션 기반의 HandlerMapping을 기존의 app 패키지에서 사용할 수 있도록 추가 * feat: Reflection을 통해 핸들러 매핑을 추가하도록 변경
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23 changes: 15 additions & 8 deletions
23
app/src/main/java/com/techcourse/ManualHandlerMapping.java
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116 changes: 116 additions & 0 deletions
116
mvc/src/main/java/webmvc/org/springframework/web/servlet/mvc/DispatcherServlet.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package webmvc.org.springframework.web.servlet.mvc; | ||
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| import core.org.springframework.util.ReflectionUtils; | ||
| import jakarta.servlet.ServletException; | ||
| import jakarta.servlet.http.HttpServlet; | ||
| import jakarta.servlet.http.HttpServletRequest; | ||
| import jakarta.servlet.http.HttpServletResponse; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
| import java.util.Set; | ||
| import org.reflections.Reflections; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
| import webmvc.org.springframework.web.servlet.mvc.tobe.AnnotationHandlerMapping; | ||
| import webmvc.org.springframework.web.servlet.mvc.tobe.HandlerAdapter; | ||
| import webmvc.org.springframework.web.servlet.mvc.tobe.HandlerMapping; | ||
| import webmvc.org.springframework.web.servlet.mvc.tobe.HandlerNotFoundException; | ||
| import webmvc.org.springframework.web.servlet.view.JspView; | ||
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| public class DispatcherServlet extends HttpServlet { | ||
|
|
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| private static final long serialVersionUID = 1L; | ||
| private static final Logger log = LoggerFactory.getLogger(DispatcherServlet.class); | ||
| private static final String INTERNAL_BASE_PACKAGE = "webmvc.org.springframework.web.servlet.mvc"; | ||
|
|
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| private final Object[] externalBasePackages; | ||
| private final List<HandlerMapping> handlerMappings; | ||
| private final List<HandlerAdapter> handlerAdapters; | ||
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|
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| public DispatcherServlet(Object... externalBasePackages) { | ||
| this.externalBasePackages = externalBasePackages; | ||
| this.handlerMappings = new ArrayList<>(); | ||
| this.handlerAdapters = new ArrayList<>(); | ||
| } | ||
|
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| @Override | ||
| public void init() { | ||
| final var reflections = new Reflections(externalBasePackages, INTERNAL_BASE_PACKAGE); | ||
| initHandlerMappings(reflections); | ||
| initHandlerAdapters(reflections); | ||
| } | ||
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| private void initHandlerMappings(final Reflections reflections) { | ||
| final var handlerMappingSubTypes = reflections.getSubTypesOf(HandlerMapping.class); | ||
| addHandlerMappings(handlerMappingSubTypes); | ||
| handlerMappings.forEach(HandlerMapping::initialize); | ||
| } | ||
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| private void addHandlerMappings(final Set<Class<? extends HandlerMapping>> handlerMappingSubTypes) { | ||
| for (final var handlerMappingSubType : handlerMappingSubTypes) { | ||
| if (handlerMappingSubType.isInterface()) { | ||
| continue; | ||
| } | ||
| // exclude pre-defined handler mapping | ||
| if (handlerMappingSubType.equals(AnnotationHandlerMapping.class)) { | ||
| handlerMappings.add(new AnnotationHandlerMapping(externalBasePackages)); | ||
| continue; | ||
| } | ||
| handlerMappings.add(ReflectionUtils.instantiate(handlerMappingSubType)); | ||
| } | ||
| } | ||
|
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| private void initHandlerAdapters(final Reflections reflections) { | ||
| final var handlerAdapterSubTypes = reflections.getSubTypesOf(HandlerAdapter.class); | ||
| addHandlerAdapters(handlerAdapterSubTypes); | ||
| } | ||
|
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| private void addHandlerAdapters(final Set<Class<? extends HandlerAdapter>> handlerAdapterSubTypes) { | ||
| for (final var reflectionsSubTypeOf : handlerAdapterSubTypes) { | ||
| if (reflectionsSubTypeOf.isInterface()) { | ||
| continue; | ||
| } | ||
| handlerAdapters.add(ReflectionUtils.instantiate(reflectionsSubTypeOf)); | ||
| } | ||
| } | ||
|
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| @Override | ||
| protected void service(final HttpServletRequest request, final HttpServletResponse response) throws ServletException { | ||
| log.debug("Method : {}, Request URI : {}", request.getMethod(), request.getRequestURI()); | ||
| final var handler = getHandler(request); | ||
| final var handlerAdapter = getHandlerAdapter(handler); | ||
| try { | ||
| final var modelAndView = handlerAdapter.handle(request, response, handler); | ||
| move(modelAndView.getViewName(), request, response); | ||
| } catch (Throwable e) { | ||
| log.error("Exception : {}", e.getMessage(), e); | ||
| throw new ServletException(e.getMessage()); | ||
| } | ||
| } | ||
|
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| private Object getHandler(final HttpServletRequest request) { | ||
| return handlerMappings.stream() | ||
| .map(mapping -> mapping.getHandler(request)) | ||
| .filter(Objects::nonNull) | ||
| .findAny() | ||
| .orElseThrow(() -> new HandlerNotFoundException("Not found handler for request URI : " + request.getRequestURI())); | ||
| } | ||
|
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| private HandlerAdapter getHandlerAdapter(final Object handler) { | ||
| return handlerAdapters.stream() | ||
| .filter(adapter -> adapter.supports(handler)) | ||
| .findAny() | ||
| .orElseThrow(() -> new HandlerNotFoundException("Not found handler adapter for handler : " + handler)); | ||
| } | ||
|
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| 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; | ||
| } | ||
|
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| final var requestDispatcher = request.getRequestDispatcher(viewName); | ||
| requestDispatcher.forward(request, response); | ||
| } | ||
| } |
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