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 */ 017package org.apache.wicket; 018 019/** 020 * Listens to {@link Component#detach()} calls. 021 * 022 * Detach listeners are called as the last step in the process of detaching a component; this means 023 * the component is in a fully detached state when the listener is invoked. 024 * 025 * @author igor.vaynberg 026 * 027 * @see org.apache.wicket.settings.FrameworkSettings#setDetachListener(IDetachListener) 028 */ 029public interface IDetachListener 030{ 031 /** 032 * Called when component is being detached via a call to {@link Component#detach()}. 033 * 034 * NOTICE: The component is in a fully detached state when this method is invoked; It is the 035 * listener's responsibility to maintain the detached state after this method is finished - 036 * which means if the listener causes any part of the component (eg model) to become reattached 037 * it is the listener's responsibility to detach it before this method exits. 038 * 039 * @param component 040 * component being detached 041 */ 042 default void onDetach(Component component) 043 {} 044 045 /** 046 * Called when the application is being destroyed. Useful for cleaning up listener caches, etc. 047 */ 048 default void onDestroyListener() 049 {} 050}