feat: 서블릿 기능 구현

tomcat/src/main/java/nextstep/jwp/controller/AbstractController.java

@@ -0,0 +1,27 @@
+package nextstep.jwp.controller;
+
+import nextstep.jwp.handle.ViewResolver;
+import org.apache.coyote.common.HttpMethod;
+import org.apache.coyote.common.HttpStatus;
+import org.apache.coyote.request.HttpRequest;
+import org.apache.coyote.response.HttpResponse;
+
+public abstract class AbstractController implements Controller {
+
+    @Override
+    public void service(final HttpRequest request, final HttpResponse response) throws Exception {
+        if (request.getHttpMethod() == HttpMethod.GET) {
+            doGet(request, response);
+            return;
+        }
+        if (request.getHttpMethod() == HttpMethod.POST) {
+            doPost(request, response);
+            return;
+        }
+        ViewResolver.renderPage(response, HttpStatus.NOT_FOUND, "404.html");
+    }
+
+    protected abstract void doPost(final HttpRequest request, final HttpResponse response) throws Exception;
+
+    protected abstract void doGet(final HttpRequest request, final HttpResponse response) throws Exception;
+}

tomcat/src/main/java/nextstep/jwp/exception/HandlerMappingException.java

@@ -0,0 +1,8 @@
+package nextstep.jwp.exception;
+
+public class HandlerMappingException extends RuntimeException {
+
+    public HandlerMappingException() {
+        super("Handler Mapping Fail");
+    }
+}

tomcat/src/main/java/nextstep/jwp/servlet/DispatcherServlet.java

@@ -0,0 +1,78 @@
+package nextstep.jwp.servlet;
+
+import nextstep.jwp.controller.FileController;
+import nextstep.jwp.controller.HelloWorldController;
+import nextstep.jwp.controller.LoginController;
+import nextstep.jwp.controller.RegisterController;
+import nextstep.jwp.exception.HandlerMappingException;
+import nextstep.jwp.handle.HandlerMapping;
+import nextstep.jwp.handle.HandlerMethod;
+import nextstep.jwp.handle.mapping.GetFileMappingInfo;
+import nextstep.jwp.handle.mapping.GetHelloWorldMappingInfo;
+import nextstep.jwp.handle.mapping.GetLoginMappingInfo;
+import nextstep.jwp.handle.mapping.GetRegisterMappingInfo;
+import nextstep.jwp.handle.mapping.PostLoginMappingInfo;
+import nextstep.jwp.handle.mapping.PostRegisterMappingInfo;
+import org.apache.catalina.core.Servlet;
+import org.apache.coyote.request.HttpRequest;
+import org.apache.coyote.response.HttpResponse;
+
+public class DispatcherServlet implements Servlet {
+
+    private HandlerMapping handlerMapping;
+
+    public DispatcherServlet() {
+        try {
+            this.handlerMapping = new HandlerMapping();
+            handlerMapping.addMappingInfo(
+                    new GetFileMappingInfo(),
+                    new HandlerMethod(
+                            FileController.getInstance(),
+                            FileController.class.getDeclaredMethod("doGet", HttpRequest.class, HttpResponse.class)
+                    )
+            );
+            handlerMapping.addMappingInfo(
+                    new GetHelloWorldMappingInfo(),
+                    new HandlerMethod(
+                            HelloWorldController.getInstance(),
+                            HelloWorldController.class.getDeclaredMethod("doGet", HttpRequest.class, HttpResponse.class)
+                    )
+            );
+            handlerMapping.addMappingInfo(
+                    new GetLoginMappingInfo(),
+                    new HandlerMethod(
+                            LoginController.getInstance(),
+                            LoginController.class.getDeclaredMethod("doGet", HttpRequest.class, HttpResponse.class)
+                    )
+            );
+            handlerMapping.addMappingInfo(
+                    new PostLoginMappingInfo(),
+                    new HandlerMethod(
+                            LoginController.getInstance(),
+                            LoginController.class.getDeclaredMethod("doPost", HttpRequest.class, HttpResponse.class)
+                    )
+            );
+            handlerMapping.addMappingInfo(
+                    new GetRegisterMappingInfo(),
+                    new HandlerMethod(
+                            RegisterController.getInstance(),
+                            RegisterController.class.getDeclaredMethod("doGet", HttpRequest.class, HttpResponse.class)
+                    ));
+            handlerMapping.addMappingInfo(
+                    new PostRegisterMappingInfo(),
+                    new HandlerMethod(
+                            RegisterController.getInstance(),
+                            RegisterController.class.getDeclaredMethod("doPost", HttpRequest.class, HttpResponse.class)
+                    )
+            );
+        } catch (NoSuchMethodException e) {
+            throw new HandlerMappingException();
+        }
+    }
+
+    @Override
+    public void service(final HttpRequest request, final HttpResponse response) throws Exception {
+        final HandlerMethod handlerMethod = handlerMapping.getHandlerMethod(request);
+        handlerMethod.invokeMethod(request, response);
+    }
+}

tomcat/src/main/java/org/apache/catalina/core/ContextManager.java

@@ -0,0 +1,24 @@
+package org.apache.catalina.core;
+
+import java.util.ArrayList;
+import java.util.List;
+import nextstep.jwp.servlet.DispatcherServlet;
+import org.apache.coyote.exception.NotFoundServletException;
+import org.apache.coyote.request.HttpRequest;
+import org.apache.coyote.response.HttpResponse;
+
+public class ContextManager {
+
+    private static final List<Servlet> servlets = new ArrayList<>();
+
+    static {
+        servlets.add(new DispatcherServlet());
+    }
+
+    public static void invoke(final HttpRequest request, final HttpResponse response) throws Exception {
+        final Servlet servlet = servlets.stream()
+                .findFirst()
+                .orElseThrow(NotFoundServletException::new);
+        servlet.service(request, response);
+    }
+}

tomcat/src/main/java/org/apache/catalina/core/Servlet.java

@@ -0,0 +1,9 @@
+package org.apache.catalina.core;
+
+import org.apache.coyote.request.HttpRequest;
+import org.apache.coyote.response.HttpResponse;
+
+public interface Servlet {
+
+    void service(final HttpRequest request, final HttpResponse response) throws Exception;
+}

tomcat/src/main/java/org/apache/coyote/exception/NotFoundServletException.java

@@ -0,0 +1,8 @@
+package org.apache.coyote.exception;
+
+public class NotFoundServletException extends RuntimeException {
+
+    public NotFoundServletException() {
+        super("Match Servlet Not Found");
+    }
+}

tomcat/src/main/java/org/apache/coyote/http11/Http11Processor.java

@@ -3,9 +3,8 @@
 import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.net.Socket;
+import org.apache.catalina.core.ContextManager;
 import org.apache.coyote.Processor;
-import org.apache.coyote.handle.HandlerMapping;
-import org.apache.coyote.handle.HandlerMethod;
 import org.apache.coyote.request.HttpRequest;
 import org.apache.coyote.response.HttpResponse;
 import org.slf4j.Logger;
@@ -33,12 +32,11 @@ public void process(final Socket connection) {
              final var outputStream = connection.getOutputStream();
              final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream))
         ) {
-            final HttpRequest httpRequest = HttpRequest.parse(bufferedReader);
-            final HttpResponse httpResponse = new HttpResponse(httpRequest.getHttpVersion());
-            final HandlerMethod handlerMethod = HandlerMapping.getHandlerMethod(httpRequest);
-            handlerMethod.invokeMethod(httpRequest, httpResponse);
+            final HttpRequest request = HttpRequest.parse(bufferedReader);
+            final HttpResponse response = new HttpResponse(request.getHttpVersion());
+            ContextManager.invoke(request, response);
 
-            outputStream.write(httpResponse.toString().getBytes());
+            outputStream.write(response.toString().getBytes());
             outputStream.flush();
         } catch (Exception e) {
             log.error(e.getMessage(), e);