ApplicationListener spring 监听器

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/*  * Copyright 2002-2016 the original author or authors.  *  * Licensed 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  *  *      https://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.springframework.context;   import java.util.EventListener;   /**  * Interface to be implemented by application event listeners.  * Based on the standard {@code java.util.EventListener} interface  * for the Observer design pattern.  *  * <p>As of Spring 3.0, an ApplicationListener can generically declare the event type  * that it is interested in. When registered with a Spring ApplicationContext, events  * will be filtered accordingly, with the listener getting invoked for matching event  * objects only.  *  * @author Rod Johnson  * @author Juergen Hoeller  * @param <E> the specific ApplicationEvent subclass to listen to  * @see org.springframework.context.event.ApplicationEventMulticaster  */ @FunctionalInterface public interface ApplicationListener<E extends ApplicationEvent> extends EventListener {       /**      * Handle an application event.      * @param event the event to respond to      */     void onApplicationEvent(E event);   }