org.springframework.context.event.ApplicationEventMulticaster Maven / Gradle / Ivy
/*
* Copyright 2002-2019 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;
import org.springframework.lang.Nullable;
/**
* Interface to be implemented by objects that can manage a number of
* {@link ApplicationListener} objects and publish events to them.
*
* An {@link org.springframework.context.ApplicationEventPublisher}, typically
* a Spring {@link org.springframework.context.ApplicationContext}, can use an
* {@code ApplicationEventMulticaster} as a delegate for actually publishing events.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @author Stephane Nicoll
* @see ApplicationListener
*/
public interface ApplicationEventMulticaster {
/**
* Add a listener to be notified of all events.
* @param listener the listener to add
*/
void addApplicationListener(ApplicationListener listener);
/**
* Add a listener bean to be notified of all events.
* @param listenerBeanName the name of the listener bean to add
*/
void addApplicationListenerBean(String listenerBeanName);
/**
* Remove a listener from the notification list.
* @param listener the listener to remove
*/
void removeApplicationListener(ApplicationListener listener);
/**
* Remove a listener bean from the notification list.
* @param listenerBeanName the name of the listener bean to remove
*/
void removeApplicationListenerBean(String listenerBeanName);
/**
* Remove all listeners registered with this multicaster.
*
After a remove call, the multicaster will perform no action
* on event notification until new listeners are registered.
*/
void removeAllListeners();
/**
* Multicast the given application event to appropriate listeners.
*
Consider using {@link #multicastEvent(ApplicationEvent, ResolvableType)}
* if possible as it provides better support for generics-based events.
* @param event the event to multicast
*/
void multicastEvent(ApplicationEvent event);
/**
* Multicast the given application event to appropriate listeners.
*
If the {@code eventType} is {@code null}, a default type is built
* based on the {@code event} instance.
* @param event the event to multicast
* @param eventType the type of event (can be {@code null})
* @since 4.2
*/
void multicastEvent(ApplicationEvent event, @Nullable ResolvableType eventType);
}