org.springframework.context.event.ApplicationEventMulticaster Maven / Gradle / Ivy
/*
* Copyright 2002-2023 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 java.util.function.Predicate;
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
* @see #removeApplicationListener(ApplicationListener)
* @see #removeApplicationListeners(Predicate)
*/
void addApplicationListener(ApplicationListener listener);
/**
* Add a listener bean to be notified of all events.
* @param listenerBeanName the name of the listener bean to add
* @see #removeApplicationListenerBean(String)
* @see #removeApplicationListenerBeans(Predicate)
*/
void addApplicationListenerBean(String listenerBeanName);
/**
* Remove a listener from the notification list.
* @param listener the listener to remove
* @see #addApplicationListener(ApplicationListener)
* @see #removeApplicationListeners(Predicate)
*/
void removeApplicationListener(ApplicationListener listener);
/**
* Remove a listener bean from the notification list.
* @param listenerBeanName the name of the listener bean to remove
* @see #addApplicationListenerBean(String)
* @see #removeApplicationListenerBeans(Predicate)
*/
void removeApplicationListenerBean(String listenerBeanName);
/**
* Remove all matching listeners from the set of registered
* {@code ApplicationListener} instances (which includes adapter classes
* such as {@link ApplicationListenerMethodAdapter}, e.g. for annotated
* {@link EventListener} methods).
*
Note: This just applies to instance registrations, not to listeners
* registered by bean name.
* @param predicate the predicate to identify listener instances to remove,
* e.g. checking {@link SmartApplicationListener#getListenerId()}
* @since 5.3.5
* @see #addApplicationListener(ApplicationListener)
* @see #removeApplicationListener(ApplicationListener)
*/
void removeApplicationListeners(Predicate> predicate);
/**
* Remove all matching listener beans from the set of registered
* listener bean names (referring to bean classes which in turn
* implement the {@link ApplicationListener} interface directly).
* Note: This just applies to bean name registrations, not to
* programmatically registered {@code ApplicationListener} instances.
* @param predicate the predicate to identify listener bean names to remove
* @since 5.3.5
* @see #addApplicationListenerBean(String)
* @see #removeApplicationListenerBean(String)
*/
void removeApplicationListenerBeans(Predicate predicate);
/**
* 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.
* @see #removeApplicationListeners(Predicate)
*/
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.
*
If a matching {@code ApplicationListener} does not support asynchronous
* execution, it must be run within the calling thread of this multicast call.
* @param event the event to multicast
* @see ApplicationListener#supportsAsyncExecution()
*/
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.
*
If a matching {@code ApplicationListener} does not support asynchronous
* execution, it must be run within the calling thread of this multicast call.
* @param event the event to multicast
* @param eventType the type of event (can be {@code null})
* @since 4.2
* @see ApplicationListener#supportsAsyncExecution()
*/
void multicastEvent(ApplicationEvent event, @Nullable ResolvableType eventType);
}