| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.cocoon.servletservice; |
| |
| import java.io.IOException; |
| import java.lang.reflect.Proxy; |
| import java.util.Arrays; |
| import java.util.LinkedHashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import javax.servlet.Servlet; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.springframework.context.ApplicationContext; |
| import org.springframework.web.context.support.WebApplicationContextUtils; |
| |
| /** |
| * A servlet that dispatch to managed sevlets from the context Spring container. |
| * It dispatch to servlets that has the property mountPath, and dispatches to the |
| * servlet with the longest prefix of the request pathInfo. |
| * |
| * This servlet will also initialize and destroy all the servlets that it finds |
| * from the context container. This means that there must only be one dispatcher |
| * servlet, otherwise the managed servlets will be initialized several times. |
| * |
| * @version $Id$ |
| * @since 1.0.0 |
| */ |
| public class DispatcherServlet extends HttpServlet { |
| |
| /** By default we use the logger for this class. */ |
| private final Log logger = LogFactory.getLog(getClass()); |
| |
| /** |
| * The startup date of the Spring application context used to setup the {@link #blockServletCollector}. |
| * TODO: Use a better way to reload {@link #blockServletCollector} when RCL is used, see COCOON-2076 |
| */ |
| private long applicationContextStartDate; |
| |
| /** The servlet collector bean */ |
| private Map blockServletCollector; |
| |
| public void init() throws ServletException { |
| this.log("Block dispatcher was initialized successfully."); |
| } |
| |
| protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { |
| final Map mountableServlets = getBlockServletMap(); |
| String path = req.getPathInfo(); |
| if (path == null) { |
| path = ""; |
| } |
| |
| // find the servlet which mount path is the longest prefix of the path info |
| int index = path.length(); |
| Servlet servlet = null; |
| while (servlet == null && index != -1) { |
| path = path.substring(0, index); |
| servlet = (Servlet) mountableServlets.get(path); |
| index = path.lastIndexOf('/'); |
| } |
| //case when servlet is mounted at "/" must be handled separately |
| servlet = servlet == null ? (Servlet) mountableServlets.get("/") : servlet; |
| if (servlet == null) { |
| String message = "No block for " + req.getPathInfo(); |
| res.sendError(HttpServletResponse.SC_NOT_FOUND, message); |
| this.logger.info(message); |
| return; |
| } |
| |
| // Create a dynamic proxy class that overwrites the getServletPath and |
| // getPathInfo methods to provide reasonable values in the called servlet |
| // the dynamic proxy implements all interfaces of the original request |
| HttpServletRequest request = (HttpServletRequest) Proxy.newProxyInstance( |
| req.getClass().getClassLoader(), |
| getInterfaces(req.getClass()), |
| new DynamicProxyRequestHandler(req, path)); |
| |
| if (this.logger.isDebugEnabled()) { |
| this.logger.debug("DispatcherServlet: service servlet=" + servlet + |
| " mountPath=" + path + |
| " servletPath=" + request.getServletPath() + |
| " pathInfo=" + request.getPathInfo()); |
| } |
| |
| servlet.service(request, res); |
| } |
| |
| private void getInterfaces(Set interfaces, Class clazz) { |
| Class[] clazzInterfaces = clazz.getInterfaces(); |
| for (int i = 0; i < clazzInterfaces.length; i++) { |
| //add all interfaces extended by this interface or directly |
| //implemented by this class |
| getInterfaces(interfaces, clazzInterfaces[i]); |
| } |
| |
| // the superclazz is null if class is instanceof Object, is |
| // an interface, a primitive type or void |
| Class superclazz = clazz.getSuperclass(); |
| if (superclazz != null) { |
| //add all interfaces of the superclass to the list |
| getInterfaces(interfaces, superclazz); |
| } |
| |
| interfaces.addAll(Arrays.asList(clazzInterfaces)); |
| } |
| |
| private Class[] getInterfaces(final Class clazz) { |
| Set interfaces = new LinkedHashSet(); |
| getInterfaces(interfaces, clazz); |
| return (Class[]) interfaces.toArray(new Class[interfaces.size()]); |
| } |
| |
| public Map getBlockServletMap() { |
| ApplicationContext applicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext()); |
| if (this.blockServletCollector == null || applicationContext.getStartupDate() != this.applicationContextStartDate) { |
| this.applicationContextStartDate = applicationContext.getStartupDate(); |
| this.blockServletCollector = (Map) applicationContext.getBean("org.apache.cocoon.servletservice.spring.BlockServletMap"); |
| } |
| return blockServletCollector; |
| } |
| |
| } |