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* <td>description * </tr> * <tr> * <td>supportedMethods * <td>GET,POST * <td>comma-separated (CSV) list of methods supported by this controller, * such as GET, POST and PUT</td> * </tr> * <tr> * <td>requireSession * <td>false * <td>whether a session should be required for requests to be able to * be handled by this controller. This ensures that derived controller * can - without fear of null pointers - call request.getSession() to * retrieve a session. If no session can be found while processing * the request, a ServletException will be thrown</td> * </tr> * <tr> * <td>cacheSeconds * <td>-1 * <td>indicates the amount of seconds to include in the cache header * for the response following on this request. 0 (zero) will include * headers for no caching at all, -1 (the default) will not generate * <i>any headers and any positive number will generate headers * that state the amount indicated as seconds to cache the content</td> * </tr> * <tr> * <td>synchronizeOnSession * <td>false * <td>whether the call to handleRequestInternal should be * synchronized around the HttpSession, to serialize invocations * from the same client. No effect if there is no HttpSession. * </td> * </tr> * </table> * * @author Rod Johnson * @author Juergen Hoeller * @see WebContentInterceptor */ public abstract class AbstractController extends WebContentGenerator implements Controller { private boolean synchronizeOnSession = false; /** * Set if controller execution should be synchronized on the session, * to serialize parallel invocations from the same client. * <p>More specifically, the execution of the handleRequestInternal * method will get synchronized if this flag is "true". The best available * session mutex will be used for the synchronization; ideally, this will * be a mutex exposed by HttpSessionMutexListener. * <p>The session mutex is guaranteed to be the same object during * the entire lifetime of the session, available under the key defined * by the <code>SESSION_MUTEX_ATTRIBUTE constant. It serves as a * safe reference to synchronize on for locking on the current session. * <p>In many cases, the HttpSession reference itself is a safe mutex * as well, since it will always be the same object reference for the * same active logical session. However, this is not guaranteed across * different servlet containers; the only 100% safe way is a session mutex. * @see org.springframework.web.servlet.mvc.AbstractController#handleRequestInternal * @see org.springframework.web.util.HttpSessionMutexListener * @see org.springframework.web.util.WebUtils#getSessionMutex(javax.servlet.http.HttpSession) */ public final void setSynchronizeOnSession(boolean synchronizeOnSession) { this.synchronizeOnSession = synchronizeOnSession; } /** * Return whether controller execution should be synchronized on the session. */ public final boolean isSynchronizeOnSession() { return this.synchronizeOnSession; } public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception { // Delegate to WebContentGenerator for checking and preparing. checkAndPrepare(request, response, this instanceof LastModified); // Execute handleRequestInternal in synchronized block if required. if (this.synchronizeOnSession) { HttpSession session = request.getSession(false); if (session != null) { Object mutex = WebUtils.getSessionMutex(session); synchronized (mutex) { return handleRequestInternal(request, response); } } } return handleRequestInternal(request, response); } /** * Template method. Subclasses must implement this. * The contract is the same as for <code>handleRequest. * @see #handleRequest */ protected abstract ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception; }

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Spring Framework example source code file (AbstractController.java)

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Java - Spring Framework tags/keywords

abstractcontroller, controller, exception, exception, http, httpservletresponse, httpservletresponse, httpsession, lastmodified, modelandview, modelandview, object, object, request, response, servlet, webcontentgenerator

The Spring Framework AbstractController.java source code

 * Copyright 2002-2007 the original author or authors.
 * Licensed 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.springframework.web.servlet.mvc;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.support.WebContentGenerator;
import org.springframework.web.util.WebUtils;

 * <p>Convenient superclass for controller implementations, using the Template
 * Method design pattern.</p>
 * <p>As stated in the {@link org.springframework.web.servlet.mvc.Controller Controller}
 * interface, a lot of functionality is already provided by certain abstract
 * base controllers. The AbstractController is one of the most important
 * abstract base controller providing basic features such as the generation
 * of caching headers and the enabling or disabling of
 * supported methods (GET/POST).</p>
 * <p>Workflow
 * (<a href="Controller.html#workflow">and that defined by interface):
* <ol> * <li>{@link #handleRequest(HttpServletRequest,HttpServletResponse) handleRequest()} * will be called by the DispatcherServlet</li> * <li>Inspection of supported methods (ServletException if request method * is not support)</li> * <li>If session is required, try to get it (ServletException if not found) * <li>Set caching headers if needed according to cacheSeconds propery * <li>Call abstract method {@link #handleRequestInternal(HttpServletRequest,HttpServletResponse) handleRequestInternal()} * (optionally synchronizing around the call on the HttpSession), * which should be implemented by extending classes to provide actual * functionality to return {@link org.springframework.web.servlet.ModelAndView ModelAndView} objects.</li> * </ol> * </p> * * <p>Exposed configuration properties * (<a href="Controller.html#config">and those defined by interface):
* <table border="1"> * <tr> * <td>name * <td>default

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