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.application;
018
019import org.apache.wicket.Component;
020
021/**
022 * Listener interface that receives messages when components are constructed. This mechanism is used
023 * by {@link org.apache.wicket.authorization.IAuthorizationStrategy}, but can additionally be used
024 * to implement things like dependency injection support etc.
025 * 
026 * <strong>Implementations must be thread safe</strong>
027 * 
028 * @author Eelco Hillenius
029 */
030@FunctionalInterface
031public interface IComponentInstantiationListener
032{
033        /**
034         * Called for every component that is instantiated. This method is called
035         * <strong>during</strong> construction, so do not depend on the construction being completed
036         * yet. The id is guaranteed to be set before this call.
037         * 
038         * @param component
039         *            the component that is being instantiated.
040         */
041        void onInstantiation(Component component);
042}