001    /*
002     * Copyright (c) OSGi Alliance (2004, 2008). All Rights Reserved.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     *      http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.osgi.service.cm;
017    
018    /**
019     * Listener for Configuration Events. When a <code>ConfigurationEvent</code>
020     * is fired, it is asynchronously delivered to a
021     * <code>ConfigurationListener</code>.
022     * 
023     * <p>
024     * <code>ConfigurationListener</code> objects are registered with the
025     * Framework service registry and are notified with a
026     * <code>ConfigurationEvent</code> object when an event is fired.
027     * <p>
028     * <code>ConfigurationListener</code> objects can inspect the received
029     * <code>ConfigurationEvent</code> object to determine its type, the pid of
030     * the <code>Configuration</code> object with which it is associated, and the
031     * Configuration Admin service that fired the event.
032     * 
033     * <p>
034     * Security Considerations. Bundles wishing to monitor configuration events will
035     * require <code>ServicePermission[ConfigurationListener,REGISTER]</code> to
036     * register a <code>ConfigurationListener</code> service.
037     * 
038     * @version $Revision: 5673 $
039     * @since 1.2
040     */
041    public interface ConfigurationListener {
042            /**
043             * Receives notification of a Configuration that has changed.
044             * 
045             * @param event The <code>ConfigurationEvent</code>.
046             */
047            public void configurationEvent(ConfigurationEvent event);
048    }