spring GenericApplicationListener 源码
spring GenericApplicationListener 代码
文件路径：/spring-context/src/main/java/org/springframework/context/event/GenericApplicationListener.java
/*
* Copyright 2002-2021 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.event;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.core.ResolvableType;
/**
* Extended variant of the standard {@link ApplicationListener} interface,
* exposing further metadata such as the supported event and source type.
*
* <p>As of Spring Framework 4.2, this interface supersedes the Class-based
* {@link SmartApplicationListener} with full handling of generic event types.
* As of 5.3.5, it formally extends {@link SmartApplicationListener}, adapting
* {@link #supportsEventType(Class)} to {@link #supportsEventType(ResolvableType)}
* with a default method.
*
* @author Stephane Nicoll
* @author Juergen Hoeller
* @since 4.2
* @see SmartApplicationListener
* @see GenericApplicationListenerAdapter
*/
public interface GenericApplicationListener extends SmartApplicationListener {
/**
* Overrides {@link SmartApplicationListener#supportsEventType(Class)} with
* delegation to {@link #supportsEventType(ResolvableType)}.
*/
@Override
default boolean supportsEventType(Class<? extends ApplicationEvent> eventType) {
return supportsEventType(ResolvableType.forClass(eventType));
}
/**
* Determine whether this listener actually supports the given event type.
* @param eventType the event type (never {@code null})
*/
boolean supportsEventType(ResolvableType eventType);
}
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