001    /*
002     * Copyright 2005 Stephen J. McConnell.
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
013     * implied.
014     *
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    
019    package net.dpml.transit.model;
020    
021    import java.util.EventListener;
022    import java.rmi.Remote;
023    import java.rmi.RemoteException;
024    
025    /**
026     * A listener for events related to the Transit cache subsystem.
027     *
028     * @author <a href="http://www.dpml.net">Digital Product Meta Library</a>
029     * @version 1.0.1
030     */
031    public interface CacheListener extends EventListener, Remote
032    {
033       /**
034        * Notify the listener of a change to the cache directory.
035        * @param event the cache directory change event
036        * @exception RemoteException if a remote exception occurs
037        */
038        void cacheDirectoryChanged( CacheDirectoryChangeEvent event ) throws RemoteException;
039    
040       /**
041        * Notify the listener of the addition of a new host.
042        * @param event the host added event
043        * @exception RemoteException if a remote exception occurs
044        */
045        void hostAdded( CacheEvent event ) throws RemoteException;
046    
047       /**
048        * Notify the listener of the removal of a host.
049        * @param event the host removed event
050        * @exception RemoteException if a remote exception occurs
051        */
052        void hostRemoved( CacheEvent event ) throws RemoteException;
053    
054    }