001    /*
002     * Copyright 1999-2001,2004 The Apache Software Foundation.
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    
017    package org.apache.commons.workflow;
018    
019    
020    import java.util.EventListener;
021    
022    
023    /**
024     * A <strong>ScopeListener</strong> registers its interest in receiving
025     * <code>ScopeEvent</code> notifications when the occur on a particular
026     * <code>Scope</code> of interest.
027     *
028     * @version $Revision: 155475 $ $Date: 2005-02-26 13:31:11 +0000 (Sat, 26 Feb 2005) $
029     * @author Craig R. McClanahan
030     */
031    
032    public interface ScopeListener extends EventListener {
033    
034    
035        // --------------------------------------------------------- Public Methods
036    
037    
038        /**
039         * Invoked when a new bean was added to this <code>scope</code>.
040         *
041         * @param event The <code>ScopeEvent</code> that has occurred
042         */
043        public void beanAdded(ScopeEvent event);
044    
045    
046        /**
047         * Invoked when an existing bean was removed in this <code>scope</code>.
048         *
049         * @param event The <code>ScopeEvent</code> that has occurred
050         */
051        public void beanRemoved(ScopeEvent event);
052    
053    
054        /**
055         * Invoked when an existing bean was replaced in this <code>scope</code>.
056         *
057         * @param event The <code>ScopeEvent</code> that has occurred
058         */
059        public void beanReplaced(ScopeEvent event);
060    
061    
062        /**
063         * Invoked when the entire Scope is cleared.
064         *
065         * @param event The <code>ScopeEvent</code> that has occurred
066         */
067        public void scopeCleared(ScopeEvent event);
068    
069    
070    }
071    
072