1 package org.apache.turbine.modules.actions.sessionvalidator; 2 3 /* 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 import org.apache.turbine.modules.Action; 23 24 /** 25 * The SessionValidator attempts to retrieve the User object from the 26 * Servlet API session that is associated with the request. If the 27 * data cannot be retrieved, it is handled here. If the user has not 28 * been marked as being logged into the system, the user is rejected 29 * and the screen is set to the screen.homepage value in 30 * TurbineResources.properties. 31 * 32 * <p> 33 * 34 * Other systems generally have a database table which stores this 35 * information, but we take advantage of the Servlet API here to save 36 * a hit to the database for each and every connection that a user 37 * makes. 38 * 39 * <p> 40 * 41 * This action is special in that it should only be executed by the 42 * Turbine servlet. 43 * 44 * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a> 45 * @version $Id: SessionValidator.java 1078552 2011-03-06 19:58:46Z tv $ 46 */ 47 public abstract class SessionValidator extends Action 48 { 49 // empty 50 }