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    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  }