spring security DelegatingApplicationListener 源码
spring security DelegatingApplicationListener 代码
文件路径：/core/src/main/java/org/springframework/security/context/DelegatingApplicationListener.java
/*
* 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.security.context;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.SmartApplicationListener;
import org.springframework.util.Assert;
/**
* Used for delegating to a number of SmartApplicationListener instances. This is useful
* when needing to register an SmartApplicationListener with the ApplicationContext
* programmatically.
*
* @author Rob Winch
*/
public final class DelegatingApplicationListener implements ApplicationListener<ApplicationEvent> {
private List<SmartApplicationListener> listeners = new CopyOnWriteArrayList<>();
@Override
public void onApplicationEvent(ApplicationEvent event) {
if (event == null) {
return;
}
for (SmartApplicationListener listener : this.listeners) {
Object source = event.getSource();
if (source != null && listener.supportsEventType(event.getClass())
&& listener.supportsSourceType(source.getClass())) {
listener.onApplicationEvent(event);
}
}
}
/**
* Adds a new SmartApplicationListener to use.
* @param smartApplicationListener the SmartApplicationListener to use. Cannot be
* null.
*/
public void addListener(SmartApplicationListener smartApplicationListener) {
Assert.notNull(smartApplicationListener, "smartApplicationListener cannot be null");
this.listeners.add(smartApplicationListener);
}
}
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