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}