001/*
002 * Copyright 2002-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.context.event;
018
019import org.springframework.context.ApplicationEvent;
020import org.springframework.context.ApplicationListener;
021import org.springframework.core.Ordered;
022
023/**
024 * Extended variant of the standard {@link ApplicationListener} interface,
025 * exposing further metadata such as the supported event and source type.
026 *
027 * <p>For full introspection of generic event types, consider implementing
028 * the {@link GenericApplicationListener} interface instead.
029 *
030 * @author Juergen Hoeller
031 * @since 3.0
032 * @see GenericApplicationListener
033 * @see GenericApplicationListenerAdapter
034 */
035public interface SmartApplicationListener extends ApplicationListener<ApplicationEvent>, Ordered {
036
037        /**
038         * Determine whether this listener actually supports the given event type.
039         * @param eventType the event type (never {@code null})
040         */
041        boolean supportsEventType(Class<? extends ApplicationEvent> eventType);
042
043        /**
044         * Determine whether this listener actually supports the given source type.
045         * @param sourceType the source type, or {@code null} if no source
046         */
047        boolean supportsSourceType(Class<?> sourceType);
048
049}