01: package org.apache.turbine.modules.actions.sessionvalidator;
02:
03: /*
04: * Copyright 2001-2005 The Apache Software Foundation.
05: *
06: * Licensed under the Apache License, Version 2.0 (the "License")
07: * you may not use this file except in compliance with the License.
08: * You may obtain a copy of the License at
09: *
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: }
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