/*
 * 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 jakarta.servlet;

import java.util.Set;

/**
 * ServletContainerInitializers (SCIs) are registered via an entry in the file
 * META-INF/services/jakarta.servlet.ServletContainerInitializer that must be included in the JAR file that contains the
 * SCI implementation.
 * <p>
 * SCI processing is performed regardless of the setting of metadata-complete. SCI processing can be controlled per JAR
 * file via fragment ordering. If absolute ordering is defined, then only the JARs included in the ordering will be
 * processed for SCIs. To disable SCI processing completely, an empty absolute ordering may be defined.
 * <p>
 * SCIs register an interest in annotations (class, method or field) and/or types via the
 * {@link jakarta.servlet.annotation.HandlesTypes} annotation which is added to the class.
 *
 * @since Servlet 3.0
 */
public interface ServletContainerInitializer {

    /**
     * Receives notification during startup of a web application of the classes within the web application that matched
     * the criteria defined via the {@link jakarta.servlet.annotation.HandlesTypes} annotation.
     *
     * @param c   The (possibly null) set of classes that met the specified criteria
     * @param ctx The ServletContext of the web application in which the classes were discovered
     *
     * @throws ServletException If an error occurs
     */
    void onStartup(Set<Class<?>> c, ServletContext ctx) throws ServletException;
}
