001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.services;
016    
017    import org.apache.tapestry.event.ResetEventListener;
018    
019    /**
020     * Service interface for a source of <b>reset</b> events; this events are used
021     * to inform other services that they should discard any cached data.
022     *
023     * @author Howard Lewis Ship
024     * @since 4.0
025     */
026    public interface ResetEventHub
027    {
028        public void addResetEventListener(ResetEventListener l);
029    
030        public void removeResetEventListener(ResetEventListener l);
031    
032            /**
033             * Notifies registered listeners.
034             */
035        public void fireResetEvent();
036    }