001 package org.apache.turbine.modules.actions.sessionvalidator; 002 003 /* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022 import org.apache.turbine.modules.Action; 023 024 /** 025 * The SessionValidator attempts to retrieve the User object from the 026 * Servlet API session that is associated with the request. If the 027 * data cannot be retrieved, it is handled here. If the user has not 028 * been marked as being logged into the system, the user is rejected 029 * and the screen is set to the screen.homepage value in 030 * TurbineResources.properties. 031 * 032 * <p> 033 * 034 * Other systems generally have a database table which stores this 035 * information, but we take advantage of the Servlet API here to save 036 * a hit to the database for each and every connection that a user 037 * makes. 038 * 039 * <p> 040 * 041 * This action is special in that it should only be executed by the 042 * Turbine servlet. 043 * 044 * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a> 045 * @version $Id: SessionValidator.java 1078552 2011-03-06 19:58:46Z tv $ 046 */ 047 public abstract class SessionValidator extends Action 048 { 049 // empty 050 }