001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.configuration.event;
018    
019    /**
020     * <p>
021     * A simple event listener interface for configuration observers.
022     * </p>
023     * <p>
024     * This interface can be implemented by classes that are interested in
025     * &quot;raw&quot; events caused by configuration objects. Each manipulation on
026     * a configuration object will generate such an event. There is only a single
027     * method that is invoked when an event occurs.
028     * </p>
029     *
030     * @author <a
031     * href="http://commons.apache.org/configuration/team-list.html">Commons
032     * Configuration team</a>
033     * @version $Id: ConfigurationListener.java 561230 2007-07-31 04:17:09Z rahul $
034     * @since 1.3
035     */
036    public interface ConfigurationListener
037    {
038        /**
039         * Notifies this listener about a manipulation on a monitored configuration
040         * object.
041         *
042         * @param event the event describing the manipulation
043         */
044        void configurationChanged(ConfigurationEvent event);
045    }