/*
* 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;
import java.util.ServiceLoader;
import org.apache.wicket.request.resource.PackageResource;
/**
* Initializes something when application loads.
* <p>
* Initializer can be used for clustering. Lets say you access a page that has a link to a resource on
* node A now the url for the resource gets forwarded to node B, but node B doesn't have the
* resource registered yet because maybe the page class hasn't been loaded and so its static block
* hasn't run yet. So the initializer is a place for you to register all those resources and do all
* the stuff you used to do in the static blocks.
* <p>
* You don't have to pre-register {@link PackageResource package resources}, as they can be
* initialized lazily.
* <p>
* Initializers can be configured via {@link ServiceLoader}, i.e. by having a file
* /META-INF/services/org.apache.wicket.IInitializer in the class path root, with each line containing the
* full class name of an {@link IInitializer}.
* </p>
*
* @author Jonathan Locke
*/
public interface IInitializer
{
/**
* @param application
* The application loading the component
*/
void init(Application application);
/**
* @param application
* The application loading the component
*/
void destroy(Application application);
}