/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.wicket.application;

import org.apache.wicket.Component;

/**
 * Listener interface that receives messages when components are constructed. This mechanism is used
 * by {@link org.apache.wicket.authorization.IAuthorizationStrategy}, but can additionally be used
 * to implement things like dependency injection support etc.
 * 
 * <strong>Implementations must be thread safe</strong>
 * 
 * @author Eelco Hillenius
 */
public interface IComponentInstantiationListener
{
	/**
	 * Called for every component that is instantiated. This method is called
	 * <strong>during</strong> construction, so do not depend on the construction being completed
	 * yet. The id is guaranteed to be set before this call.
	 * 
	 * @param component
	 *            the component that is being instantiated.
	 */
	void onInstantiation(Component component);
}
