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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  package org.apache.log4j.chainsaw;
    18
    19  import java.util.EventListener;
    20
    21  /**
    22   * Chainsaw notifies these Listeners when the user has requested
    23   * it to shutdown.
    24   * <p>
    25   * Listeners should use this opportunity to release any resources
    26   * and/or perform any clean up activity.
    27   * <p>
    28   * Listeners should <B>NOT</b> perform the action of actual shutting down
    29   * however (i.e. do not call System.exit()).
    30   *
    31   * @author Paul Smith &lt;psmith@apache.org&gt;
    32   * @see LogUI#setShutdownAction(Action)
    33   */
    34  public interface ShutdownListener extends EventListener {
    35
    36      void shuttingDown();
    37  }