spring-kafka KafkaEvent 源码
spring-kafka KafkaEvent 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/event/KafkaEvent.java
/*
* Copyright 2015-2021 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.kafka.event;
import org.springframework.context.ApplicationEvent;
import org.springframework.util.Assert;
/**
* Base class for events.
*
* @author Gary Russell
*
*/
public abstract class KafkaEvent extends ApplicationEvent {
private static final long serialVersionUID = 1L;
private final Object container;
public KafkaEvent(Object source, Object container) {
super(source);
this.container = container;
}
/**
* Get the container for which the event was published, which will be the parent
* container if the source that emitted the event is a child container, or the source
* itself otherwise. The type is required here to avoid a dependency tangle between
* the event and listener packages.
* @param type the container type (e.g. {@code MessageListenerContainer.class}).
* @param <T> the type.
* @return the container.
* @since 2.2.1
* @see #getSource(Class)
*/
@SuppressWarnings("unchecked")
public <T> T getContainer(Class<T> type) {
Assert.isInstanceOf(type, this.container);
return (T) this.container;
}
/**
* Get the container (source) that published the event. This is provided as an
* alternative to {@link #getSource()} to avoid the need to cast in user code. The
* type is required here to avoid a dependency tangle between the event and listener
* packages.
* @param type the container type (e.g. {@code MessageListenerContainer.class}).
* @param <T> the type.
* @return the container.
* @since 2.2.1
* @see #getContainer(Class)
* @see #getSource()
*/
@SuppressWarnings("unchecked")
public <T> T getSource(Class<T> type) {
Assert.isInstanceOf(type, getSource());
return (T) getSource();
}
}
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