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1   package org.apache.turbine.modules.actions.sessionvalidator;
2   
3   /*
4    * Copyright 2001-2005 The Apache Software Foundation.
5    *
6    * Licensed under the Apache License, Version 2.0 (the "License")
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  import org.apache.turbine.modules.Action;
20  
21  /***
22   * The SessionValidator attempts to retrive the User object from the
23   * Servlet API session that is associated with the request.  If the
24   * data cannot be retrieved, it is handled here.  If the user has not
25   * been marked as being logged into the system, the user is rejected
26   * and the screen is set to the screen.homepage value in
27   * TurbineResources.properties.
28   *
29   * <p>
30   *
31   * Other systems generally have a database table which stores this
32   * information, but we take advantage of the Servlet API here to save
33   * a hit to the database for each and every connection that a user
34   * makes.
35   *
36   * <p>
37   *
38   * This action is special in that it should only be executed by the
39   * Turbine servlet.
40   *
41   * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>
42   * @version $Id: SessionValidator.java 264148 2005-08-29 14:21:04Z henning $
43   */
44  public abstract class SessionValidator extends Action
45  {
46  }